S-8520/8521 Series
www.ablicinc.com
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE
SWITCHING REGULATOR CONTROLLER
© ABLIC Inc., 1997-2010 Rev.9.0_02
1
The S-8520/8521 Series is a CMOS step-down switching regulator-controller with PWM control (S-8520 Series) and PWM
/ PFM switching control (S-8521 Series). The S-8520/8521 Series has a reference voltage source, an oscillation circuit, an
error amplifier, and other components.
The S-8520 Series provides low-ripple power, high efficiency, and excellent transient characteristics due to a PWM control
circuit capable of varying the duty ratio linearly from 0% up to 100%. The S-8520/8521 Series also has a soft-start circuit
that prevents overshoot at startup.
The S-8521 Series works with either PWM control or PFM control. It normally operates using PWM control with a duty ratio
of 25% to 100%, but under a light load, it automatically switches to PFM control with a duty ratio of 25%. The S-8520/8521
Series ensures high efficiency over a wide range of conditions for devices, from the standby mode to the operation.
By adding external Pch power MOS FET or PNP transistor, coil, capacitor, and externally connected diode, the
S-8520/8521 Series can function as a step-down switching regulator, and is ideal for power supply units of portable
devices due to small SOT-23-5 and the feature of low current consumption. It is also ideal for AC adapters due to the input
voltage up to 16 V.
Features
Low current consumption During operation: 60 A max. (A, B types)
21 A max. (C, D types)
100 A max. (E, F types)
During shutdown: 0.5 A max.
Input voltage: 2.5 V to 16 V (B, D, F types)
2.5 V to 10 V (A, C, E types)
Output voltage: Selectable between 1.5 V and 6.0 V in 0.1 V step
Duty ratio: 0% to 100% PWM control (S-8520 Series)
25% to100% PWM / PFM switching control (S-8521 Series)
External parts are Pch power MOS FET or PNP transistor, coil, diode, and capacitor only
(When using PNP transistor, add base resistor and capacitor).
Oscillation frequency: 180 kHz typ. (A, B types)
60 kHz typ. (C, D types)
300 kHz typ. (E, F types)
Soft-start function: 8 ms. typ. (A, B types)
12 ms. typ. (C, D types)
4.5 ms. typ. (E, F types)
With a shutdown function
With a built-in overload protection circuit Overload detection time: 4 ms. typ. (A type)
14 ms. typ. (C type)
2.6 ms. typ. (E type)
Lead-free, Sn 100%, halogen-free*1
*1. Refer to “ Product Name Structure” for details.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
2
Applications
On-board power supplies of battery devices for mobile phone, electronic notebooks, PDAs.
Power supplies for audio equipment, including portable CD players and headphone stereo equipment.
Fixed voltage power supply for cameras, video and communication devices.
Power supplies for microcomputers
Conversion from NiH or four NiCd cells or two lithium-ion cells to 3.3 V / 3 V.
Conversion of AC adapter input to 5 V / 3 V.
Package
SOT-23-5
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
3
Block Diagrams
1. S-8520 Series
VOUT
VSS
L
SD COUT
VON/OFF
______
VIN
Tr
EXT
VIN
CIN
Oscillation
circuit
PWM control
circuit
Reference voltage
source with soft-start
ON/OFF
______
Remark All the diodes in the figure are parasitic diodes.
Figure 1
2. S-8521 Series
VOUT
VSS
L
SD COUT
VIN
Tr
EXT
VIN
CIN
VON/OFF
______
ON/OFF
______
Oscillation
circuit
PWM / PFM switching
control circuit
Reference voltage
source with soft-start
Remark All the diodes in the figure are parasitic diodes.
Figure 2
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
4
Product Name Structure
The control types, product types, and output voltage for the S-8520/8521 Series can be selected at the user’s request.
Please refer to the “1. Product name” for the definition of the product name, “2. Package” regarding the package
drawings and “3. Product name list” for the full product names.
1. Product name
S-852 x x xx MC xxx T2 x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
IC direction in tape specifications*1
Product name (abbreviation)*2
Package name (abbreviation)
MC : SOT-23-5
Output voltage
15 to 60
(When the output voltage is 1.5 V, it is expressed as 15.)
Product type
A: Oscillation frequency of 180 kHz,
With overload protection circuit
B: Oscillation frequency of 180 kHz,
Without overload protection circuit
C: Oscillation frequency of 60 kHz,
With overload protection circuit
D: Oscillation frequency of 60 kHz,
Without overload protection circuit
E: Oscillation frequency of 300 kHz,
With overload protection circuit
F: Oscillation frequency of 300 kHz,
Without overload protection circuit
Control system
0: PWM control
1: PWM / PFM switching control
*1. Refer to the tape specifications.
*2. Refer to “3. Product name list”.
2. Package
Package Name Drawing code
Package Tape Reel
SOT-23-5 MP005-A-P-SD MP005-A-C-SD MP005-A-R-SD
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
5
3. Product name list
3. 1 S-8520 Series
Table 1 (1 / 2)
Output voltage [V] S-8520AxxMC Series S-8520BxxMC Series S-8520CxxMC Series
1.5 S-8520B15MC-ARAT2x
1.8 S-8520B18MC-ARDT2x
2.0 S-8520A20MC-AVFT2x
2.1 S-8520A21MC-AVGT2x
2.4 S-8520B24MC-ARJT2x
2.5 S-8520A25MC-AVKT2x S-8520B25MC-ARKT2x S-8520C25MC-BRKT2x
2.6 S-8520A26MC-AVLT2x
2.7 S-8520A27MC-AVMT2x S-8520B27MC-ARMT2x S-8520C27MC-BRMT2x
2.8 S-8520A28MC-AVNT2x S-8520B28MC-ARNT2x S-8520C28MC-BRNT2x
2.9 S-8520A29MC-AVOT2x S-8520B29MC-AROT2x S-8520C29MC-BROT2x
3.0 S-8520A30MC-AVPT2x S-8520B30MC-ARPT2x S-8520C30MC-BRPT2x
3.1 S-8520A31MC-AVQT2x S-8520B31MC-ARQT2x S-8520C31MC-BRQT2x
3.2 S-8520A32MC-AVRT2x S-8520B32MC-ARRT2x S-8520C32MC-BRRT2x
3.3 S-8520A33MC-AVST2x S-8520B33MC-ARST2x S-8520C33MC-BRST2x
3.4 S-8520A34MC-AVTT2x S-8520B34MC-ARTT2x S-8520C34MC-BRTT2x
3.5 S-8520A35MC-AVUT2x S-8520B35MC-ARUT2x S-8520C35MC-BRUT2x
3.6 S-8520A36MC-AVVT2x S-8520B36MC-ARVT2x S-8520C36MC-BRVT2x
4.0 S-8520B40MC-ARZT2x
4.3 S-8520B43MC-ASCT2x
5.0 S-8520A50MC-AWJT2x S-8520B50MC-ASJT2x S-8520C50MC-BSJT2x
5.3 S-8520B53MC-ASMT2x
Table 1 (2 / 2)
Output voltage [V] S-8520DxxMC Series S-8520ExxMC Series S-8520FxxMC Series
1.5 S-8520E15MC-BJAT2x S-8520F15MC-BNAT2x
1.6 S-8520E16MC-BJBT2x
1.8 S-8520E18MC-BJDT2x S-8520F18MC-BNDT2x
2.0
S-8520F20MC-BNFT2x
2.5 S-8520D25MC-BVKT2x S-8520E25MC-BJKT2x S-8520F25MC-BNKT2x
2.6
S-8520F26MC-BNLT2x
2.7 S-8520D27MC-BVMT2x
S-8520F27MC-BNMT2x
2.8 S-8520D28MC-BVNT2x S-8520E28MC-BJNT2x S-8520F28MC-BNNT2x
2.9 S-8520D29MC-BVOT2x
3.0 S-8520D30MC-BVPT2x S-8520E30MC-BJPT2x S-8520F30MC-BNPT2x
3.1 S-8520D31MC-BVQT2x
S-8520F31MC-BNQT2x
3.2 S-8520D32MC-BVRT2x
3.3 S-8520D33MC-BVST2x S-8520E33MC-BJST2x S-8520F33MC-BNST2x
3.4 S-8520D34MC-BVTT2x
S-8520F34MC-BNTT2x
3.5 S-8520D35MC-BVUT2x
S-8520F35MC-BNUT2x
3.6 S-8520D36MC-BVVT2x
S-8520F36MC-BNVT2x
4.0
S-8520F40MC-BNZT2x
4.5
S-8520F45MC-BOET2x
5.0 S-8520D50MC-BWJT2x S-8520E50MC-BKJT2x S-8520F50MC-BOJT2x
5.2 S-8520E52MC-BKLT2x
5.5
S-8520F55MC-BOOT2x
6.0
S-8520F60MC-BOTT2x
Remark 1. Please contact our sales office for products with output voltage other than those specified above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
6
3. 2 S-8521 Series
Table 2 (1 / 2)
Output voltage [V] S-8521AxxMC Series S-8521BxxMC Series S-8521CxxMC Series
1.5 S-8521B15MC-ATAT2x
1.6
S-8521C16MC-BTBT2x
1.8 S-8521B18MC-ATDT2x
1.9 S-8521B19MC-ATET2x
2.0 S-8521B20MC-ATFT2x
2.1 S-8521B21MC-ATGT2x
2.3 S-8521B23MC-ATIT2x
2.5 S-8521A25MC-AXKT2x S-8521B25MC-ATKT2x S-8521C25MC-BTKT2x
2.6 S-8521B26MC-ATLT2x
2.7 S-8521A27MC-AXMT2x S-8521B27MC-ATMT2x S-8521C27MC-BTMT2x
2.8 S-8521A28MC-AXNT2x S-8521B28MC-ATNT2x S-8521C28MC-BTNT2x
2.9 S-8521A29MC-AXOT2x S-8521B29MC-ATOT2x S-8521C29MC-BTOT2x
3.0 S-8521A30MC-AXPT2x S-8521B30MC-ATPT2x S-8521C30MC-BTPT2x
3.1 S-8521A31MC-AXQT2x S-8521B31MC-ATQT2x S-8521C31MC-BTQT2x
3.2 S-8521A32MC-AXRT2x S-8521B32MC-ATRT2x S-8521C32MC-BTRT2x
3.3 S-8521A33MC-AXST2x S-8521B33MC-ATST2x S-8521C33MC-BTST2x
3.4 S-8521A34MC-AXTT2x S-8521B34MC-ATTT2x S-8521C34MC-BTTT2x
3.5 S-8521A35MC-AXUT2x S-8521B35MC-ATUT2x S-8521C35MC-BTUT2x
3.6 S-8521A36MC-AXVT2x S-8521B36MC-ATVT2x S-8521C36MC-BTVT2x
4.0 S-8521B40MC-ATZT2x
4.4 S-8521B44MC-AUDT2x
5.0 S-8521A50MC-AYJT2x S-8521B50MC-AUJT2x S-8521C50MC-BUJT2x
5.1 S-8521B51MC-AUKT2x
5.3 S-8521B53MC-AUMT2x
6.0 S-8521B60MC-AUTT2x
Table 2 (2 / 2)
Output voltage [V] S-8521DxxMC Series S-8521ExxMC Series S-8521FxxMC Series
1.5 S-8521E15MC-BLAT2x S-8521F15MC-BPAT2x
1.6 S-8521D16MC-BXBT2x S-8521E16MC-BLBT2x
1.7 S-8521E17MC-BLCT2x
1.8 S-8521D18MC-BXDT2x S-8521E18MC-BLDT2x S-8521F18MC-BPDT2x
1.9 S-8521E19MC-BLET2x S-8521F19MC-BPET2x
2.0 S-8521D20MC-BXFT2x S-8521E20MC-BLFT2x
2.1 S-8521D21MC-BXGT2x
2.2 S-8521D22MC-BXHT2x S-8521E22MC-BLHT2x
2.5 S-8521D25MC-BXKT2x S-8521E25MC-BLKT2x S-8521F25MC-BPKT2x
2.7 S-8521D27MC-BXMT2x
2.8 S-8521D28MC-BXNT2x
2.9 S-8521D29MC-BXOT2x
3.0 S-8521D30MC-BXPT2x S-8521E30MC-BLPT2x S-8521F30MC-BPPT2x
3.1 S-8521D31MC-BXQT2x
3.2 S-8521D32MC-BXRT2x
S-8521F32MC-BPRT2x
3.3 S-8521D33MC-BXST2x S-8521E33MC-BLST2x S-8521F33MC-BPST2x
3.4 S-8521D34MC-BXTT2x － S-8521F34MC-BPTT2x
3.5 S-8521D35MC-BXUT2x S-8521E35MC-BLUT2x
3.6 S-8521D36MC-BXVT2x
S-8521F36MC-BPVT2x
4.0 S-8521D40MC-BXZT2x
S-8521F40MC-BPZT2x
4.2 S-8521E42MC-BMBT2x
4.5 S-8521D45MC-BYET2x
5.0 S-8521D50MC-BYJT2x S-8521E50MC-BMJT2x S-8521F50MC-BQJT2x
5.2 S-8521D52MC-BYLT2x
5.3 S-8521E53MC-BMMT2x
5.5 S-8521D55MC-BYOT2x
S-8521F55MC-BQOT2x
Remark 1. Please contact our sales office for products with output voltage other than those specified above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
7
Pin Configuration
5 4
1 3 2
SOT-23-5
Top view
Table 3
Pin No. Symbol Description
1
ON/OFF
______
Shutdown pin
“H”: Normal operation
(Step-down operation)
“L”: Stop step-down operation
(All circuits stop)
2 VSS GND pin
3 VOUT Output voltage monitoring pin
4 EXT Connection pin for external transistor
5 VIN IC power supply pin
Figure 3
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
8
Absolute Maximum Ratings
Table 4
(Ta = 25°C unless otherwise specified)
Item Symbol Absolute maximum rating Unit
VIN pin voltage A, C, E types VIN VSS 0.3 to VSS 12.0 V
B, D, F types VSS 0.3 to VSS 18.0 V
VOUT pin voltage A, C, E types VOUT VSS 0.3 to VSS 12.0 V
B, D, F types VSS 0.3 to VSS 18.0 V
ON/OFF
______
pin voltage A, C, E types VON/OFF
______
VSS 0.3 to VSS 12.0 V
B, D, F types VSS 0.3 to VSS 18.0 V
EXT pin voltage VEXT V
SS 0.3 to VIN 0.3 V
EXT pin current IEXT 50 mA
Power dissipation PD 250 (When not mounted on board) mW
600*1 mW
Operating ambient temperature To
pr
40 to 85 °C
Storage temperature Tst
g
40 to 125 °C
*1. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm 76.2 mm t1.6 mm
(2) Board name : JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage. These values must therefore not be exceeded under any conditions.
(1) When mounted on board (2) When not mounted on board
0 50 100 150
400
200
0
Power Dissipation (P
D
) [mW]
500
300
100
600
700
Ambient Temperature (Ta) [C]
050 100 150
200
100
0
250
150
50
300
Ambient Temperature (Ta) [C]
Power Dissipation (P
D
) [mW]
Figure 4 Power Dissipation of Package
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
9
Electrical Characteristics
1. A type, B type
Table 5
(Ta = 25°C unless otherwise specified)
Item Symbol Conditions Min. Typ. Max. Unit Test
Circuit
Output voltage*1 VOUT(E) VOUT(S)
0.976 VOUT(S) VOUT(S)
1.024 V 3
Input voltage VIN A type 2.5 10.0 V 2
B type 2.5 16.0 V 2
Current consumption 1 ISS1 V
OUT = VOUT
(
S
)
1.2 35 60 A2
Current consumption
during shutdown ISSS VON/OFF
______
= 0 V 0.5 A2
EXT pin output current
IEXTH V
EXT = VIN 0.4 V
S-8520/8521x15 to 24 2.3 4.5 mA
S-8520/8521x25 to 34 3.7 7.0 mA
S-8520/8521x35 to 44 5.3 9.3 mA
S-8520/8521x45 to 54 6.7 11.3 mA
S-8520/8521x55 to 60 8.0 13.3 mA
IEXTL V
EXT = 0.4 V
S-8520/8521x15 to 24 4.3 8.4 mA
S-8520/8521x25 to 34 7.0 13.2 mA
S-8520/8521x35 to 44 9.9 17.5 mA
S-8520/8521x45 to 54 12.6 21.4 mA
S-8520/8521x55 to 60 15.0 25.1 mA
Line regulation VOUT1 VOUT
(
S
)
2.0 V VIN = 2.5 V to 2.94 V 30 60 mV 3
VOUT
(
S
)
2.0 V VIN = VOUT
(
S
)
1.2 to 1.4 30 60 mV 3
Load regulation VOUT2 Load current = 10 A to IOUT 1.25 30 60 mV 3
Output voltage
temperature coefficient
VOUT
Ta Ta = 40°C to 85°C VOUT(S)
5E 5 V/°C 3
Oscillation frequency fosc Measure waveform at
EXT pin.
VOUT
(
S
)
2.4 V 144 180 216 kHz 3
VOUT
(
S
)
2.5 V 153 180 207 kHz 3
PWM / PFM control
switching duty ratio
(S-8521 Series)
PFMDuty No load, measure waveform at EXT pin. 15 25 40 % 3
ON/OFF pin
input voltage
VSH Determine oscillation at EXT pin 1.8 V 2
VSL Determine oscillation stop at EXT pin 0.3 V 2
ON/OFF pin
input leakage current
ISH 0.1 0.1 A1
ISL 0.1 0.1 A1
Soft start time tss 4.0 8.0 16.0 ms 3
Overload detection time
(A type) tpro Time until the EXT pin reaches VIN after
dropping VOUT to 0 V. 2.0 4.0 8.0 ms 2
Efficiency EFFI 93 %3
External parts Coil: Sumida Corporation CD54 (47 H)
Diode: Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type)
Capacitor: Matsushita Electric Industrial Co., Ltd. TE (16 V, 22 F tantalum type)
Transistor: Toshiba Corporation 2SA1213
Base resistance (Rb): 0.68 k
Base capacitor (Cb): 2200 pF (Ceramic type)
Unless otherwise indicated, connect the recommended components to the IC. When VIN = VOUT(S) 1.2 V (VIN = 2.5 V
when VOUT(S) 2.0 V), IOUT = 120 mA, connect the ON/OFF
______
pin to the VIN pin.
*1. VOUT(S): Specified output voltage value, VOUT(E): Actual output voltage value
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
10
2. C type, D type
Table 6
(Ta = 25°C unless otherwise specified)
Item Symbol Conditions Min. Typ. Max. Unit Test
Circuit
Output voltage*1 VOUT(E) VOUT(S)
0.976 VOUT(S) VOUT(S)
1.024 V 3
Input voltage VIN C type 2.5 10.0 V 2
D type 2.5 16.0 V 2
Current consumption 1 ISS1 V
OUT = VOUT
(
S
)
1.2 10 21 A2
Current consumption
during shutdown ISSS VON/OFF
______
= 0 V 0.5 A2
EXT pin output current
IEXTH V
EXT = VIN 0.4 V
S-8520/8521x15 to 24 2.3 4.5 mA
S-8520/8521x25 to 34 3.7 7.0 mA
S-8520/8521x35 to 44 5.3 9.3 mA
S-8520/8521x45 to 54 6.7 11.3 mA
S-8520/8521x55 to 60 8.0 13.3 mA
IEXTL V
EXT = 0.4 V
S-8520/8521x15 to 24 4.3 8.4 mA
S-8520/8521x25 to 34 7.0 13.2 mA
S-8520/8521x35 to 44 9.9 17.5 mA
S-8520/8521x45 to 54 12.6 21.4 mA
S-8520/8521x55 to 60 15.0 25.1 mA
Line regulation VOUT1 VOUT
(
S
)
2.0 V VIN = 2.5 V to 2.94 V 30 60 mV 3
VOUT
(
S
)
2.0 V VIN = VOUT
(
S
)
1.2 to 1.4 30 60 mV 3
Load regulation VOUT2 Load current = 10 A to IOUT 1.25 30 60 mV 3
Output voltage
temperature coefficient
VOUT
Ta Ta = 40°C to 85°C VOUT(S)
5E 5 V/°C 3
Oscillation frequency fosc Measure waveform at
EXT pin.
VOUT
(
S
)
2.4 V 45 60 75 kHz 3
VOUT
(
S
)
2.5 V 48 60 72 kHz 3
PWM / PFM control
switching duty ratio
(S-8521 Series)
PFMDuty No load, measured waveform at EXT pin. 15 25 40 % 3
ON/OFF pin
input voltage
VSH Determine oscillation at EXT pin 1.8 V 2
VSL Determine oscillation stop at EXT pin 0.3 V 2
ON/OFF pin
input leakage current
ISH 0.1 0.1 A1
ISL 0.1 0.1 A1
Soft start time tss 6.0 12.0 24.0 ms 3
Overload detection time
(C type) tpro Time until the EXT pin reaches VIN after
dropping VOUT to 0 V. 7.0 14.0 28.0 ms 2
Efficiency EFFI 93 %3
External parts Coil: Sumida Corporation CD54 (47 H)
Diode: Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type)
Capacitor: Matsushita Electric Industrial Co., Ltd. TE (16 V, 22 F tantalum type)
Transistor: Toshiba Corporation 2SA1213
Base resistance (Rb): 0.68 k
Base capacitor (Cb): 2200 pF (Ceramic type)
Unless otherwise indicated, connect the recommended components to the IC. When VIN = VOUT(S) 1.2 V (VIN = 2.5 V
when VOUT(S) 2.0 V), IOUT = 120 mA, connect the ON/OFF
______
pin to the VIN pin.
*1. VOUT(S): Specified output voltage value, VOUT(E): Actual output voltage value
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
11
3. E type, F type
Table 7
(Ta = 25°C unless otherwise specified)
Item Symbol Conditions Min. Typ. Max. Unit Test
Circuit
Output voltage*1 VOUT(E) VOUT(S)
0.976 VOUT(S) VOUT(S)
1.024 V 3
Input voltage VIN E type 2.5 10.0 V 2
F type 2.5 16.0 V 2
Current consumption 1 ISS1 V
OUT = VOUT
(
S
)
1.2 60 100 A2
Current consumption
during shutdown ISSS VON/OFF
______
= 0 V 0.5 A2
EXT pin output current
IEXTH V
EXT = VIN 0.4 V
S-8520/8521x15 to 24 2.3 4.5 mA
S-8520/8521x25 to 34 3.7 7.0 mA
S-8520/8521x35 to 44 5.3 9.3 mA
S-8520/8521x45 to 54 6.7 11.3 mA
S-8520/8521x55 to 60 8.0 13.3 mA
IEXTL V
EXT = 0.4 V
S-8520/8521x15 to 24 4.3 8.4 mA
S-8520/8521x25 to 34 7.0 13.2 mA
S-8520/8521x35 to 44 9.9 17.5 mA
S-8520/8521x45 to 54 12.6 21.4 mA
S-8520/8521x55 to 60 15.0 25.1 mA
Line regulation VOUT1 VOUT
(
S
)
2.0 V VIN = 2.5 V to 2.94 V 30 60 mV 3
VOUT
(
S
)
2.0 V VIN = VOUT
(
S
)
1.2 to 1.4 30 60 mV 3
Load regulation VOUT2 Load current = 10 A to IOUT 1.25 30 60 mV 3
Output voltage
temperature coefficient
VOUT
Ta Ta = 40°C to 85°C VOUT(S)
5E 5 V/°C 3
Oscillation frequency fosc Measure waveform at
EXT pin.
VOUT
(
S
)
2.4 V 225 300 375 kHz 3
VOUT
(
S
)
2.5 V 240 300 360 kHz 3
PWM / PFM control
switching duty ratio
(S-8521 Series)
PFMDuty No load, measure waveform at EXT pin. 15 25 40 % 3
ON/OFF pin
input voltage
VSH Determine oscillation at EXT pin 1.8 V 2
VSL Determine oscillation stop at EXT pin 0.3 V 2
ON/OFF pin
input leakage current
ISH 0.1 0.1 A1
ISL 0.1 0.1 A1
Soft start time tss 2.0 4.5 9.2 ms 3
Overload detection time
(E type) tpro Time until the EXT pin reaches VIN after
dropping VOUT to 0 V. 1.3 2.6 4.5 ms 2
Efficiency EFFI 90 %3
External parts Coil: Sumida Corporation CD54 (47 H)
Diode: Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type)
Capacitor: Matsushita Electric Industrial Co., Ltd. TE (16 V, 22 F tantalum type)
Transistor: Toshiba Corporation 2SA1213
Base resistance (Rb): 0.68 k
Base capacitor (Cb): 2200 pF (Ceramic type)
Unless otherwise indicated, connect the recommended components to the IC. When VIN = VOUT(S) 1.2 V (VIN = 2.5 V
when VOUT(S) 2.0 V), IOUT = 120 mA, connect the ON/OFF
______
pin to the VIN pin.
*1. VOUT(S): Specified output voltage value, VOUT(E): Actual output voltage value
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
12
Test Circuit
1.
EXT
VSS
VOUT
open
open
VIN
AON/OFF
_
_____
Figure 5
2.
VSS
VIN
VOUT
EXT
Osilloscope
A
ON/OFF
_
_____
Figure 6
3.
VSS
0.68 k 2200 pF
VIN
V
VOUT
EXT
ON/OFF
_
_____
Figure 7
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
13
Operation
1. Switching control method
1. 1 PWM control (S-8520 Series)
The S-8520 Series is a DC-DC converter using a pulse width modulation method (PWM) and features a low
current consumption.
In conventional PFM DC-DC converters, pulses are skipped when the output load current is low, causing a
fluctuation in the ripple frequency of the output voltage, resulting in an increase in the ripple voltage.
The switching frequency does not change, although the pulse width changes from 0 to 100% corresponding to
each load current. The ripple voltage generated from switching can thus be removed easily through a filter
because the switching frequency is constant. And the ripple voltage will be skipped to be low current
consumption when the pulse width is 0% or it is no load, input current voltage is high.
1. 2 PWM / PFM switching control (S-8521 Series)
S-8521 Series is a DC-DC converter that automatically switches between a pulse width modulation method
(PWM) and a pulse frequency modulation method (PFM), depending on the load current, and features low
current consumption.
The S-8521 Series operates under PWM control with the pulse width duty changing from 25 to 100% in a high
output load current area.
The S-8521 Series operates under PFM control with the pulse width duty fixed at 25%, and pulses are skipped
according to the load current. The oscillation circuit thus oscillates intermittently so that the resultant lower self
current consumption prevents a reduction in the efficiency at a low load current. The switching point from PWM
control to PFM control depends on the external devices (coil, diode, etc.), input voltage and output voltage.
The S-8521 Series is an especially highly efficient DC-DC converter at an output current around 100 A.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
14
2. Soft start function
The S-8520/8521 Series has a built-in soft start-circuit. This circuit enables the output voltage (VOUT) to rise
gradually over the specified soft start time (t), when power-on or when the ON/OFF
______
pin is at the “H” level. This
prevents the output voltage from overshooting.
However, the soft-start function of this IC is not able to perfectly prevent a rush current from flowing to the load
(Refer to Figure 8). Since this rush current depends on the input voltage and load conditions, Perform sufficient
evaluation with actual device for design.
S-8520A33MC (VIN: 0 V4.0 V)
t [1 ms/div]
VOUT
[1 V/div]
Rush current
[0.5 A/div]
0 A
1.5 A
3 V
0 V
Figure 8 Waveforms of output voltage and rush current at soft start
3. ON/OFF
_______
pin (Shutdown pin)
The ON/OFF
______
pin stops or starts step-up operation.
Setting the ON/OFF
______
pin to the “L” level stops operation of all the internal circuits and reduces current consumption
significantly. The EXT pin’s voltage is set to the VIN voltage level so that the switching transistor is turned off.
Do not use the ON/OFF
______
pin in a floating state because it has the structure shown in Figure 9 and is not pulled up
or pulled down internally. Do not apply a voltage of between 0.3 V and 1.8 V to the ON/OFF
______
pin because applying
such a voltage increases the current consumption. When not using the ON/OFF
______
pin, connect it to the VIN pin.
Table 8
ON/OFF
_
_____
pin CR Oscillation Circuit Output voltage
“H” Operation Set value
“L” Stop VSS
VIN
VSS
ON/OFF
_
_____
Figure 9
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
15
4. Overload protection circuit (A, C, E types)
The A, C and E types of the S-8520/8521 Series have a built-in overload protection circuit.
If the output voltage drops under the overload status, the maximum duty status (100%) continues. If this 100% duty
status lasts longer than the overload detection time (tpro), the circuit keeps the EXT pin at “H” to protect the
switching transistor and inductor. When the overload protection circuit is functioning, the soft start works in the IC
for the reference voltage, and the reference voltage rises slowly from 0 V. The reference voltage and the feedback
voltage obtained by dividing the output voltage are compared to each other. While the reference voltage is low, the
EXT pin keeps “H” and oscillation stops. If the reference voltage rises and exceeds the feedback voltage, oscillation
restarts.
After oscillation is restarted, if a load is heavy and the EXT pin keeps the “L” level longer than the overload
detection time (tpro), the circuit operates again, and the IC enters the intermittent operation mode by repeating the
action described above. Once the overload state is off, the IC restarts the normal operation.
Waveforms
at EXT pin
Protection circuit ON
[tss 0.3]
Overload detection time (tpro)
Figure 10 Waveforms at EXT pin when the overload protection circuit operates
5. 100% duty cycle
The S-8520/8521 Series operates with a maximum duty cycle of 100%. When using the B, D and F types products,
which do not have the overload protection circuit, the switching transistor keeps ON continually to supply current to
the load, even in cases where the input voltage drops to the set value of output voltage or less. The output voltage
in this case is; the voltage subtracting both of the inductance’s DC resistance and the voltage drop by the switching
resistor’s ON-resistance, from the input voltage.
The A, C and E types that have the overload protection circuit cannot be used for continually supplying current to
the load, as described above, because these types enter the intermittent operation mode by the overload protection
circuit’s operation, when 100% duty lasts longer than the overload detection time (tpro).
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
16
Selection of Products and External Parts
1. Method for selecting series products
The S-8520/8521 Series is classified into 12 types, according to the control systems (PWM control and PWM / PFM
switching control), the different oscillation frequencies, and set-up of an overload protection circuit. Please select
the type for your application according to the following features.
1. 1 Control systems
Two different control systems are available: PWM control system (S-8520 Series) and PWM / PFM switching
control system (S-8521 Series).
For applications for which the load current greatly differs between standby and operation, if the efficiency during
standby is important, applying the PWM/PFM switching system (S-8321 Series) realizes high efficiency during
standby.
For applications for which switching noise is critical, applying the PWM control system (S-8320 Series) whereby
switching frequency does not change due to load current allows the ripple voltage to be easily suppressed by
using a filter.
1. 2 Oscillation frequencies
Either oscillation frequency, 180 kHz (A and B types), 60 kHz (C and D types), or 300 kHz (E and F types), can
be selected.
The A, B, E and F types have high oscillation frequency, how ripple voltage and excellent transient response
characteristics. A small inductance can be used for these types because the peak current is low when inducing
the same load current. Use of small output capacitors is effective for downsizing devices.
The C and D types, whereby lower oscillation frequency realizes smaller self-consumption current, are highly
efficient under light loads. In particular, the D type, when combined with a PWM/PFM switching control system,
drastically improves the operation efficiency when the output load current is approximately 100 mA.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
17
1. 3 Overload protection circuit
Types are selectable the S-8520/8521 Series with the overload protection circuit (A, C and E types) or without
the overload protection circuit (B, D and F types).
By the S-8520/8521 Series with the overload protection circuit (A, C and E types), the switching components
and inductor can be protected because the overload protection circuit works and is set to the intermittent mode,
in case of overload or load short-circuit.
But in case of supplying current to load by using 100% duty cycle, select the S-8520/8521 Series without the
overload protection circuit (B, D and F types), according to the conditions of application.
The operation voltage differs in 10 V (A, B and E types) or 16 V (B, D and F types) whether the overload
protection circuit is available or not.
Table 9 shows items for selecting the type according to the requirements of application. Select it matching the
marks () for your requirement.
Table 9
Item S-8520 Series S-8521 Series
A B C D E F A B C D E F
The need of overload protection circuit
Input voltage exceeds 10 V
Focusing on efficiency of light load status
(1 mA or less)
Using with middle load current (about 200
mA)
Using with large load current (about 1 A)
Focusing on the low ripple voltage
Focusing on downsizing external parts
Remark : Indispensable condition
: Superiority of requirement
: Particularly superiority of requirement
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
18
2. Inductor
The inductance value (L value) has a strong influence on the maximum output current (IOUT) and efficiency ().
The peak current (IPK) increases by decreasing L value and the stability of the circuit improves and IOUT increases. If
L value is decreased, the efficiency falls causing a decline in the current drive capacity for the switching transistor,
and IOUT decreases.
The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes the maximum at a
certain L value. Further increasing L value decreases the efficiency due to the loss of the direct current resistance
of the coil. IOUT also decreases.
For the S-8520/8521 Series, increasing the inductance value, the output voltage may be unstable in some cases,
depending on the conditions of the input voltage, output voltage, and the load current. Perform sufficient evaluation
under the actual condition and decide an optimum inductance value.
The recommended inductances are 47 H for A, B, C, D types and 22 H for E, F types.
Be careful of the allowable inductor current when choosing an inductor. Exceeding the allowable current of the
inductor causes magnetic saturation, much lower efficiency and destruction of the IC chip due to a large current.
Choose an inductor so that IPK does not exceed the allowable current. IPK in continuous mode is calculated by the
following equation:
IPK = IOUT (VOUT VF*2 ) (VIN VOUT)
2 fosc*1 L (VIN VF*2)
*1. f
osc: Oscillation frequency
*2. V
F: Forward voltage of the diode
3. Diode
Use an external diode that meets the following requirements :
Its forward voltage is low (Schottky barrier diode is recommended).
Its switching speed is high (50 ns max.).
Its reverse direction voltage is higher than VIN.
Its current rating is higher than IPK.
4. Capacitors (CIN, COUT)
A capacitor for the input (CIN) improves efficiency by reducing power impedance and stabilizing the input current.
Select the CIN value according to impedance of the power supply to be used. Approximately 47 to 100 F is
recommended for the capacitor depending on impedance of the power source and load current value.
For a capacitor for output (CL), select a large capacitance with low ESR (Equivalent Series Resistance) for
smoothing the ripple voltage. However, capacitor with extremely small ESR such as ceramic capacitor (about 0.3
or less) may destabilize the output voltage, according to the conditions of input and output voltages. A
tantalum electrolyte capacitor is recommended. 47 F to 100 F is recommended for the capacitor.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
19
5. External transistor
Enhancement (Pch) MOS FET or bipolar (PNP) MOS FET can be used for external transistor.
5. 1 Enhancement (Pch) MOS FET type
The EXT pin of the S-8520/8521 Series is capable of directly driving a Pch MOS FET with a gate capacity
around 1000 pF.
When using a Pch MOS FET, 2 to 3% higher efficiency is provided because its switching speed is faster and it
does not cause power dissipation, compared to PNP bipolar transistors.
The important parameters in selecting MOS FETs are the threshold voltage, the breakdown voltage between
gate and source, the breakdown voltage between drain and source, the total gate capacity, the on-resistance,
and the current ratings.
The EXT pin swings from voltages between VIN to VSS. If the input voltage is low, use a MOS FET with the low
threshold voltage. If the input voltage is high, use a MOS FET having the breakdown voltage between gate and
source higher several volts than the input voltage.
Immediately after the power-on or power-off (stopping the step-down operation), the input voltage will be applied
between drain and source of the MOS FET. Use the breakdown voltage between drain and source also higher
several volts than the input voltage.
The total gate capacity and the on-resistance affect efficiency.
Power dissipation when charging and discharging the gate capacity by switching operation affects efficiency, in
the area of low load current, as the total gate capacity is larger and the input voltage is higher. Select a MOS
FET with a small total gate capacity for efficiency at light load.
In the area of large load current, efficiency is affected by power dissipation caused by MOS FET’s on-resistance.
For efficiency at large load, select a MOS FET having as low on-resistance as possible.
As for the current rating, select a MOS FET having the maximum continuous drain current rating higher than IPK.
For reference, this document has the data of efficiency. TM6201 by Toyota Industries Corporation for
applications with an input voltage of 10 V or less, IRF7606 by International Rectifier Corporation Japan for
applications with an input voltage over 10 V (Refer to “ Reference Data”).
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
20
5. 2 Bipolar PNP type
Figure 11 shows the sample of circuit diagram using Toshiba Corporation 2SA1213 as the bipolar transistor
(PNP). The hFE value and the Rb value of that bipolar transistor determine the driving capacity, which is used for
increasing the output current.
VIN
EXT
VIN
Rb C
b
Toshiba Corporation
2SA1213
Figure 11
The Rb value is given by the following equation:
R
b = VIN0.7
Ib 0.4
IEXTL
Calculate the necessary base current (Ib) using the (hFE) value of bipolar transistor by the equation, Ib = IPK
hFE ,
and select a smaller Rb value.
A small Rb value increases the output current, but it also decreases efficiency. Determine the optimum value
through experiment, since the base current may flow on the pulse, or voltage may drop due to wiring resistance.
In addition, if speed-up capacitor Cb is connected in parallel with resistor Rb, as shown in Figure 11, the loss in
switching will be reduced, leading to higher efficiency.
Determine the Cb value using the following equation:
Cb
1
2 Rb fosc 0.7
Select the Cb value after performing sufficient evaluation since the optimum Cb value differs depending upon the
characteristics of the bipolar transistor.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
21
Standard Circuits
1. Using a bipolar transistor
VSS
VOUT
VIN
CIN
L
SD COUT
Reference voltage
source with soft start
VIN
Tr
Cb Rb
EXT
PWM control or
PWM / PFM switching
control circuit
Oscillation
circuit
VON/OFF
______
ON/OFF
______
Figure 12
2. Using a Pch MOS FET transistor
VSS
VOUT
L
SD COUT
VIN
Tr
EXT
VIN
CIN
Oscillation
circuit
Reference voltage
source with soft start
PWM control or
PWM / PFM switching
control circuit
VON/OFF
______
ON/OFF
______
Figure 13
Caution The above connection diagram and constant will not guarantee successful operation. Perform
through evaluation using the actual application to set the constant.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
22
Precautions
Mount the external capacitors, the diode and the coil as close as possible to the IC, and secure grounding at a
single location.
Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover, rush current
flows at the time of a power supply injection. Because these largely depend on the coil, the capacitor and
impedance of power supply used, fully check them using an actually mounted model.
The overload protection circuit of this IC performs the protective function by detecting the maximum duty time
(100 %). In choosing the components, make sure that over currents generated by short-circuits in the load, etc.,
will not surpass the allowable dissipation of the switching transistor and inductor.
Make sure that dissipation of the switching transistor (especially at a high temperature) does not exceed the
allowable dissipation of the package.
Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
ABLIC Inc. claims no responsibility for any and all disputes arising out of or in connection with any infringement by
products including this IC of patents owned by a third party.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
23
Application Circuits
1. External adjustment of output voltage
In the S-8550/8521 Series, by adding external resistors (RA, RB) and a capacitor (CFB), the output voltage can be
adjusted or be set freely in the range of 1.5 to 6.0 V, as shown in Figure 14. Temperature gradient can be given by
inserting a thermistor in series to RA and RB.
S-8520/8521 Series
C
C
R
A
R
B
D1
VOUT
VSS
VIN
OUT
EXT
R
2
R
1
Oscillation
Circuit
PWM control or PWM /
PFM switching control unit
Reference voltage
source with soft start
ON/OFF
______
Figure 14
Caution The above connection diagram and constant will not guarantee successful operation. Perform
through evaluation using the actual application to set the constant.
The S-8520/8521 Series have an internal impedance of R1 and R2 between the VOUT pin and the VSS pin, as
shown in Figure 14.
Therefore, OUT (the output voltage) is determined by the output voltage value (VOUT) of the S-8520/8521 Series,
and the ratio of the parallel resistance value of external resistance (RB) and internal resistances (R1 R2) of the IC,
to external resistance (RA). The output voltage is expressed by the following equation:
OUT = VOUT VOUT RA (RB //*1(R1 R2))
*1. // shows the combined resistance in parallel.
The voltage accuracy of the OUT set by resistances (RA and RB) is not only affected by the IC’s output voltage
accuracy (VOUT 2.4 %), but also by the absolute precision of external resistances (RA and RB) in use and the
absolute value deviations of internal resistances (R1 and R2) in the IC.
Let us designate the maximum deviations of the absolute value of RA and RB by RA max. and RB max., respectively,
the minimum deviations by RA min. and RB min., respectively, and the maximum and minimum deviations of the
absolute value of R1 and R2 in the IC by (R1 R
2) max. and (R1 R
2) min., respectively. Then, the minimum
deviation value OUT min. and the maximum deviation value OUT max. of the OUT are expressed by the following
equations:
OUT min. = VOUT 0.976 VOUT 0.976 RA min. (RB max. // (R1 R2) max.)
OUT max. = VOUT 1.024 VOUT 1.024 RA max. (RB min. // (R1 R2) min.)
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
24
The voltage accuracy of the OUT cannot be made higher than the output voltage accuracy (VOUT 2.4%) of the IC
itself, without adjusting the RA and RB involved. The closer the voltage value of the output OUT and the output
voltage value (VOUT) of the IC are brought to one other, the more the output voltage remains immune to deviations
in the absolute accuracy of RA and RB and the absolute value of R1 and R2 in the IC. In particular, to suppress the
influence of deviations in R1 and R2 in the IC, a major contributor to deviations in the OUT, the RA and RB must be
limited to a much smaller value than that of R1 and R2 in the IC.
On the other hand, a reactive current flows through RA and RB. This reactive current must be reduced to a
negligible value with respect to the load current in the actual use of the IC so that the efficiency characteristics will
not be degraded. This requires that the value of RA and RB be made sufficiently large.
However, too large a value (more than 1 M) for the RA and RB would make the IC vulnerable to external noise.
Check the influence of this value on actual equipment.
There is a tradeoff between the voltage accuracy of the OUT and the reactive current. This should be taken into
consideration based on the requirements of the intended application.
Deviations in the absolute value of the internal resistances (R1 and R2) in the IC vary with the output voltage of the
S-8520/8521 Series, and are broadly classified as follows:
Table 10
Output voltage Deviations in the absolute value of R1 and R2 in the IC
1.5 V to 2.0 V 5.16 M to 28.9 M
2.1 V to 2.5 V 4.44 M to 27.0 M
2.6 V to 3.3 V 3.60 M to 23.3 M
3.4 V to 4.9 V 2.44 M to 19.5 M
5.0 V to 6.0 V 2.45 M to 15.6 M
When a value of R1 R
2 given by the equation indicated below is taken in calculating the voltage value of the
output OUT, a median voltage deviation will be obtained for the OUT.
R1 R2 = 2 (1 maximum deviation in absolute value of R1 and R2 1 minimum deviation in absolute value
of R1 and R2)
Moreover, add a capacitor (CC) in parallel to the external resistance (RA) in order to avoid output oscillations and
other types of instability (Refer to Figure 14).
Make sure that CC is larger than the value given by the following equation:
CC [F] 1 (2 RA [] 7.5 kHz)
If a large CC value is selected, a longer soft start time than the one set up in the IC will be set.
Caution The above connection diagram and constant will not guarantee successful operation. Perform
through evaluation using the actual application to set the constant.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
25
Characteristics (Typical Data)
1. Examples of major parameters characteristics
(1) Current consumption (ISS1)-Input voltage (VIN)
0
5
10
15
20
Ta = 25C
Ta = 85C
I
SS1
[A]
(f
osc
= 60 kHz)
2 4 6 8 10 12 14 16
V
IN
[V]
Ta = 40C
0
10
20
30
40
2 4 6 8 10 12 14 16
V
IN
[V]
I
SS1
[A]
Ta =
40C
Ta =
85C
Ta =
25C
(f
osc
= 180 kHz)
0
10
20
30
40
50
60
2 4 6 8 10 12 14 16
V
IN
[V]
I
SS1
[A]
(f
osc
= 300 kHz)
Ta = 40C
Ta = 25C
Ta = 85C
(2) Oscillation frequency (fosc)-Input voltage (VIN)
40
45
50
55
60
65
70
75
80
2 4 6 8 10 12 14 16
VIN [V]
fosc [kHz]
(fosc = 60 kHz)
Ta = 25C
Ta = 85C
Ta = 40C
140
150
160
170
180
190
200
210
220
2 4 6 8 10 12 14 16
VIN
[
V
]
fosc [kHz]
(fosc = 180 kHz)
Ta = 25C
Ta = 85C
Ta = 40C
240
260
280
300
320
340
360
2 4 6 8 10 12 14 16
VIN [V]
fosc [kHz]
(fosc = 300 kHz)
Ta = 40C
Ta =
25C
Ta =
85C
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
26
(3) EXT pin output current “H” (IEXTH)-
Input voltage (VIN)
(4) EXT pin output current “L” (IEXTL)-
Input voltage (VIN)
2 4 6 8 10 12 14 16
VIN [V]
IEXTH [mA]
Ta =
40C
Ta =
85C
Ta =
25C
60
50
40
30
20
10
0
0
10
20
30
40
50
60
2 4 6 8 10 12 14 16
VIN [V]
IEXTL [mA]
Ta = 40C
Ta =
85C
Ta =
25C
(5) Soft start time (tSS)-Input voltage (VIN)
0
5
10
15
20
25
2 4 6 8 10 12 14 16
VIN [V]
tSS [ms]
(fosc = 60 kHz)
Ta =
40C
Ta =
85C
Ta =
25C
0
5
10
15
20
25
2 4 6 8 10 12 14 16
VIN [V]
tSS [ms]
(fosc = 180 kHz)
Ta = 40C
Ta =
85C
Ta =
25C
0
2
4
6
8
10
2 4 6 8 10 12 14 16
VIN [V]
t
SS
[
ms
]
(fosc = 300 kHz)
Ta =
25C
Ta =
85C
Ta =
40C
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
27
(6) Overload detection time (tpro)-Input voltage (VIN)
6
10
14
18
22
26
30
2 4 6 8 10 12 14 16
(fosc = 60 kHz)
t
p
ro [ms]
Ta = 40C
VIN [V]
Ta = 25C
Ta = 85C
2
3
4
5
6
7
8
2 4 6 8 10 12 14 16
VIN [V]
tpro [ms]
Ta = 40C
Ta =
85C
Ta = 25C
(fosc = 180 kHz)
1
2
3
4
2 4 6 8 10 12 14 16
VIN [V]
t
p
ro [ms]
(fosc = 300 kHz)
Ta = 85C
Ta = 25C
Ta = 40C
(7) ON/OFF
______
pin input voltage “H” (VSH)-
Input voltage (VIN)
(8) ON/OFF
______
pin input voltage “L” (VSL)-
Input voltage (VIN)
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2 4 6 8 10 12 14 16
VIN [V]
VSH [V]
Ta = 40C
Ta = 25C
Ta = 85C
0.3
0.5
0.7
0.9
1.1
1.3
1.5
1.7
2 4 6 8 10 12 14 16
VIN [V]
VSL [V]
Ta =
40C
Ta =
85C
Ta =
25C
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
28
(9) Output voltage (VOUT)-Input voltage (VIN)
S-8521B30MC
(
Ta =
25°C
)
2.98
2.99
3.00
3.01
3.02
3.03
3.04
3.05
3.06
3.07
3.08
2 4 6 8 10 12 14 16
VIN [V]
VOUT [V]
IOUT = 100 mA
IOUT = 500 mA
IOUT = 0.1 mA
S-8521B50MC
(
Ta =
25°C
)
4.98
4.99
5.00
5.01
5.02
5.03
5.04
5.05
5.06
5.07
5.08
2 4 6 8 10 12 14 16
VIN [V]
VOUT [V]
IOUT = 100 mA
IOUT = 500 mA
IOUT = 0.1 mA
S-8521F33MC
(
Ta =
25°C
)
3.28
3.29
3.30
3.31
3.32
3.33
3.34
3.35
3.36
3.37
3.38
2 4 6 8 10 12 14 16
VIN [V]
VOUT [V]
IOUT = 0.1 mA
IOUT = 100 mA
IOUT = 500 mA
S-8521F50MC
(
Ta =
25°C
)
4.97
4.98
4.99
5.00
5.01
5.02
5.03
5.04
5.05
5.06
5.07
2 4 6 8 10 12 14 16
VIN [V]
VOUT [V]
IOUT = 100 mA
IOUT = 500 mA
IOUT = 0.1 mA
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
29
2. Transient Response Characteristics
2. 1 Power-on (IOUT: no load)
(1) S-8520/8521C30MC
(VIN = 0 V3.6 V)
t
[
2 ms/div
]
VIN
[2.5 V/div]
VOUT
[1 V/div]
0 V
3 V
0 V
10 V
(VIN = 0 V9.0 V)
t
[
2 ms/div
]
VIN
[2.5 V/div]
VOUT
[1 V/div]
0 V
3 V
0 V
10 V
(2) S-8520/8521A30MC
(VIN = 0 V3.6 V)
t
[
1 ms/div
]
VIN
[2.5 V/div]
VOUT
[1 V/div]
0 V
3 V
0 V
10 V
(VIN = 0 V9.0 V)
t
[
1 ms/div
]
VIN
[2.5 V/div]
VOUT
[1 V/div]
0 V
3 V
0 V
10 V
(3) S-8520/8521E33MC
(VIN = 0 V4.0 V)
t
[
1 ms/div
]
VIN
[2.5 V/div]
VOUT
[1 V/div]
0 V
3 V
0 V
10 V
(VIN = 0 V9.0 V)
t
[
1 ms/div
]
VIN
[2.5 V/div]
VOUT
[1 V/div]
0 V
3 V
0 V
10 V
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
30
2. 2 Shutdown pin response (VON/OFF
______
= 0 V1.8 V, IOUT = No load)
(1) S-8520/8521C30MC
(VIN = 3.6 V)
t
[
2 ms/div
]
OFF/ONV
[1 V/div]
VOUT
[1 V/div]
0 V
3 V
0 V
3 V
(VIN = 9.0 V)
t
[
2 ms/div
]
VOUT
[1 V/div]
0 V
3 V
0 V
3 V
OFF/ONV
[1 V/div]
(2) S-8520/8521A30MC
(VIN = 3.6 V)
t
[
1 ms/div
]
VOUT
[1 V/div]
0 V
3 V
0 V
3 V
OFF/ONV
[1 V/div]
(VIN = 9.0 V)
t
[
1 ms/div
]
VOUT
[1 V/div]
0 V
3 V
0 V
3 V
OFF/ONV
[1 V/div]
(3) S-8520/8521E33MC
(VIN = 4.0 V)
t
[
1 ms/div
]
VOUT
[1 V/div]
0 V
3 V
0 V
3 V
OFF/ONV
[1 V/div]
(VIN = 9.0 V)
t
[
1 ms/div
]
VOUT
[1 V/div]
0 V
3 V
0 V
3 V
OFF/ONV
[1 V/div]
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
31
2. 3 Supply voltage variation (VIN = 4 V9 V, 9 V4 V)
(1) S-8520/8521C30MC (2) S-8520/8521C30MC
(IOUT = 10 mA)
t [0.5 ms/div]
VIN
[2.5 V/div]
VOUT
[0.2 V/div]
0 V
10 V
(IOUT = 500 mA)
t
[
0.5 ms/div
]
VIN
[2.5 V/div]
VOUT
[0.2 V/div]
0 V
10 V
(3) S-8520/8521A30MC (4) S-8520/8521A30MC
(IOUT = 10mA)
t
[
0.5 ms/div
]
VIN
[2.5 V/div]
VOUT
[0.2 V/div]
0 V
10 V
(IOUT = 500 mA)
t
[
0.5 ms/div
]
VIN
[2.5 V/div]
VOUT
[0.2 V/div]
0 V
10 V
(5) S-8520/8521E33MC (6) S-8520/8521E33MC
(IOUT = 10 mA)
t
[
0.5 ms/div
]
VIN
[2.5 V/div]
VOUT
[0.2 V/div]
0 V
10 V
(IOUT = 500 mA)
t
[
0.5 ms/div
]
VIN
[2.5 V/div]
VOUT
[0.2 V/div]
0 V
10 V
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
32
2. 4 Load variation
(1) S-8520/8521C30MC
(VIN = 3.6 V, IOUT = 0.1 mA500 mA)
t [0.1 ms/div]
IOUT
VOUT
[0.1 V/div]
0.1 mA
500 mA
(VIN = 3.6 V, IOUT = 500 mA0.1 mA)
t
[
5 ms/div
]
IOUT
VOUT
[0.1 V/div]
0.1 mA
500 mA
(2) S-8520/8521A30MC
(VIN = 3.6 V, IOUT = 0.1 mA500 mA)
t
[
0.1 ms/div
]
IOUT
VOUT
[0.1 V/div]
0.1 mA
500 mA
(VIN = 3.6 V, IOUT = 500 mA0.1 mA)
t
[
10 ms/div
]
IOUT
VOUT
[0.1 V/div]
0.1 mA
500 mA
(3) S-8520/8521E33MC
(VIN = 4.0 V, IOUT = 0.1 mA500 mA)
t [0.1 ms/div]
IOUT
VOUT
[0.1 V/div]
0.1 mA
500 mA
(VIN = 4.0 V, IOUT = 500 mA0.1 mA)
t [5 ms/div]
IOUT
VOUT
[0.1 V/div]
0.1 mA
500 mA
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
33
Reference Data
This reference data is intended to help you select peripheral components to be externally connected to the IC.
Therefore, this information provides recommendations on external components selected with a view to accommodating
a wide variety of IC applications. Characteristic data is duly indicated in the table below.
Table 11 External parts for efficiency data
Product name Output voltage Inductor Transistor Diode Output capacitor Application
S-8520B30MC 3.0 V CD105 / 47 HTM6201 MA737 47 F IOUT 1 A, VIN 10 V
S-8520F33MC 3.3 V D62F / 22 H MA720 22 F IOUT 0.5 A, VIN 10 V
S-8520F33MC CDH113 / 22 H IRF7606 MA737 IOUT 1 A, VIN 16 V
S-8521D30MC
3.0 V
CD54 / 47 H
TM6201
MA720 47 F 2
IOUT 0.5 A, VIN 10 V,
With equipment standby mode
S-8521D30MC IRF7606 IOUT 0.5 A, VIN 16 V,
With equipment standby mode
S-8521B30MC
CD105 / 47 H
TM6201
MA737 47 F
IOUT 1 A, VIN 10 V,
With equipment standby mode
S-8521B30MC IRF7606 IOUT 1 A, VIN 16 V,
With equipment standby mode
S-8521F33MC
3.3 V
D62F / 22 H TM6201 MA720
22 F
IOUT 0.5 A, VIN 10 V,
With equipment standby mode
S-8521F33MC CDH113 / 22 H IRF7606 MA737 IOUT 1 A, VIN 16 V,
With equipment standby mode
S-8520B50MC
5.0 V
CD54 / 47 H TM6201 MA720 47 F IOUT 0.5 A, VIN 10 V
S-8520B50MC CD105 / 47 H IRF7606 MA737 IOUT 1 A, VIN 16 V
S-8520F50MC D62F / 22 H TM6201 MA720 22 F IOUT 0.5 A, VIN 10 V
S-8520F50MC CDH113 / 22 H IRF7606 MA737 IOUT 1 A, VIN 16 V
S-8521D50MC CD54 / 47 H TM6201 MA720
47 F 2
IOUT 0.5 A, VIN 10 V,
With equipment standby mode
S-8521D50MC CD105 / 47 H IRF7606 MA737 IOUT 1 A, VIN 16 V,
With equipment standby mode
S-8521B50MC CD54 / 47 H TM6201 MA720
47 F
IOUT 0.5 A, VIN 10 V,
With equipment standby mode
S-8521B50MC CD105 / 47 H IRF7606 MA737 IOUT 1 A, VIN 16 V,
With equipment standby mode
S-8521F50MC D62F / 22 H TM6201 MA720
22 F
IOUT 0.5 A, VIN 10 V,
With equipment standby mode
S-8521F50MC CDH113 / 22 H IRF7606 MA737 IOUT 1 A, VIN 16 V,
With equipment standby mode
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
34
Table 12 External parts for Ripple data
Product name Output voltage Inductor Transistor Rb C
b Diode Output capacitor
S-8520D30MC
3.0 V CD105 / 47 H 2SA1213 680 2200 pF MA720
47 F 2
S-8521D30MC
S-8520B30MC 22 F 2
S-8521B30MC
S-8520F33MC 3.3 V CDH113 / 22 H IRF7606 MA737 22 F
S-8521F33MC
S-8520D50MC
5.0 V
CD105 / 47 H 2SA1213 680 2200 pF MA720
47 F 2
S-8521D50MC
S-8520B50MC 22 F 2
S-8521B50MC
S-8520F50MC CDH113 / 22 H IRF7606 MA737 22 F
S-8521F50MC
Table 13 Performance Data
Component Product name Manufacturer name “L” value DC resistance
Maximum
allowable
current
Diameter Height
Inductor
CD54
Sumida Corporation 47 H0.37 0.72 A 5.8 mm 4.5 mm
CD105 0.17 1.28 A 10.0 mm 5.4 mm
CDH113 22 H0.09 1.44 A 11.0 mm 3.7 mm
D62F Toko Ink. 0.25 0.70 A 6.0 mm 2.7 mm
Diode MA720 Matsushita Electric
Industrial Co., Ltd.
Forward current 500 mA (at VF = 0.55 V)
MA737 Forward current 1.5 A (at VF = 0.5 V)
Output capacity
F93 Nichicon Corporation
TE Matsushita Electric
Industrial Co., Ltd.
External transistor
(Bipolar PNP) 2SA1213 Toshiba Corporation VCEO: 50 V max., IC: 2 A max., hFE: 120 to 240,
SOT-89-3 package
External transistor
(MOS FET)
TM6201 Toyota Industries
Corporation
VGS: 12 V max., ID: 2 A max., Vth: －0.7 V min.,
Ciss: 320 pF typ., Ron: 0.25 max. (VGS = 4.5 V),
SOT-89-3 package
IRF7606 International Rectifier
Corporation
VGS: 20 V max., ID: 2.4 A max., Vth: 1 V min.,
Ciss: 470 pF typ., Ron: 0.15 max. (VGS = 4.5 V),
Micro 8 package
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
35
1. Efficiency Characteristics: Output current (IOUT)-Efficiency (EFFI)
(1) S-8520B30MC
(CD105 / 47 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 3.6 V
VIN = 9.0 V
(2) S-8520F33MC
(D62F / 22 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 9 V
VIN = 6 V
VIN = 4 V
(CDH113 / 22 H, IRF7606)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 14 V
VIN = 9 V
VIN = 6 V
VIN = 4 V
(3) S-8521D30MC
(CD54 / 47 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 3.6 V
VIN = 9.0 V
(CD54 / 47 H, IRF7606)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 3.6 V
VIN = 9.0 V
(4) S-8521B30MC
(CD105 / 47 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 3.6 V
VIN = 9.0 V
(CD105 / 47 H, IRF7606)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 3.6 V
VIN = 9.0 V
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
36
(5) S-8521F33MC
(D62F / 22 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 9 V
VIN = 6 V
VIN = 4 V
(CDH113 / 22 H, IRF7606)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 14 V
VIN = 9 V
VIN = 6 V
VIN = 4 V
(6) S-8520B50MC
(CD54 / 47 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 6.0 V
VIN = 9.0 V
(CD105 / 47 H, IRF7606)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 14 V
VIN = 9 V
VIN = 6 V
(7) S-8520F50MC
(D62F / 22 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 9 V
VIN = 6 V
(CDH113 / 22 H, IRF7606)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 14 V
VIN = 9 V
VIN = 6 V
(8) S-8521D50MC
(CD54 / 47 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 6.0 V
VIN = 9.0 V
(CD105 / 47 H, IRF7606)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 14 V
VIN = 9 V
VIN = 6 V
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
37
(9) S-8521B50MC
(CD54 / 47 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 6.0 V
VIN = 9.0 V
(CD105 / 47 H, IRF7606)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 9 V
VIN = 6 V
VIN = 14 V
(10) S-8521F50MC
(D62F / 22 H, TM6201)
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
IOUT [mA]
EFFI [%]
VIN = 9 V
VIN = 6 V
(CDH113 / 22 H, IRF7606)
50
60
70
80
90
100
IOUT [mA]
EFFI [%]
VIN = 14 V
VIN = 9 V
VIN = 6 V
0.01 0.1 1 10 100 1000
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
38
2. Ripple Voltage Characteristics: Ripple voltage (V
rip
)-Input voltage (V
IN
) (L: CD105 / 47
H, Tr: 2SA1213,
SBD: MA720)
(1) S-8520D30MC (2) S-8521D30MC
(COUT = 47 F2)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 500 mA
IOUT = 100 mA
IOUT = 0.1 mA
(COUT = 47 F2)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 0.1 mA
IOUT = 500 mA
IOUT = 100 mA
(3) S-8520B30MC (4) S-8521B30MC
(COUT = 22
F
2)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 0.1 mA
IOUT = 100 mA
IOUT = 500 mA
(COUT = 22 F2)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 0.1 mA
IOUT = 500 mA
IOUT = 100 mA
(5) S-8520F33MC (6) S-8521F33MC
(COUT = 22 F)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 500 mA
IOUT = 100 mA
IOUT = 0.1 mA
(COUT = 22 F)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 500 mA
IOUT = 100 mA
IOUT = 0.1 mA
(7) S-8520D50MC (8) S-8521D50MC
(COUT = 47
F
2)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 0.1 mA
IOUT = 100 mA
IOUT = 500 mA
(COUT = 47
F
2)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 500 mA
IOUT = 100 mA
IOUT = 0.1 mA
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_02 S-8520/8521 Series
39
(9) S-8520B50MC (10) S-8521B50MC
(COUT = 22
F
2)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 500 mA
IOUT = 100 mA
IOUT = 0.1 mA
(COUT = 22
F
2)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 0.1 mA
IOUT = 500 mA
IOUT = 100 mA
(11) S-8520F50MC (12) S-8521F50MC
(COUT = 22 F)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 500 mA
IOUT = 100 mA
IOUT = 0.1 mA
(COUT = 22
F)
0
40
80
120
160
200
240
2 4 6 8 10 12 14 16
VIN [V]
Vrip [mV]
IOUT = 0.1 mA
IOUT = 100 mA
IOUT = 500 mA
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series Rev.9.0_02
40
3. PWM / PFM switching characteristics: Input voltage (VIN)-Output current (IOUT)
(1) S-8521D30MC (2) S-8521B30MC
2
6
10
14
1 10 100 1000
IOUT [mA]
VIN [V]
2
6
10
14
1 10 100 1000
IOUT [mA]
VIN [V]
(3) S-8521F33MC (4) S-8521D50MC
2
6
10
14
1 10 100 1000
IOUT [mA]
VIN [V]
2
6
10
14
1 10 100 1000
IOUT [mA]
VIN [V]
(5) S-8521B50MC (6) S-8521F50MC
2
6
10
14
1 10 100 1000
IOUT [mA]
VIN [V]
2
6
10
14
1 10 100 1000
IOUT [mA]
VIN [V]
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
2.9±0.2
1.9±0.2
0.95±0.1
0.4±0.1
0.16 +0.1
-0.06
123
4
5
No. MP005-A-P-SD-1.3
MP005-A-P-SD-1.3
SOT235-A-PKG Dimensions
mm
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
ø1.5 +0.1
-0 2.0±0.05
ø1.0 +0.2
-0 4.0±0.1 1.4±0.2
0.25±0.1
3.2±0.2
123
45
No. MP005-A-C-SD-2.1
MP005-A-C-SD-2.1
SOT235-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches:40.0±0.2)
mm
No.
TITLE
UNIT
ANGLE
ABLIC Inc.
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY. 3,000
No. MP005-A-R-SD-1.1
MP005-A-R-SD-1.1
SOT235-A-Reel
Enlarged drawing in the central part
mm
Disclaimers (Handling Precautions)
1. All the information described herein
(product data,
specifications,
figures,
tables,
programs,
algorithms and application
circuit examples,
etc.)
is current as of publishing date of this document and is subject to change without notice.
2. The circuit examples and the usages described herein are for reference only, and do not guarantee the success of
any specific mass-production design.
ABLIC Inc. is not responsible for damages caused by the reasons other than the products described herein
(hereinafter "the products") or infringement of third-party intellectual property right and any other right due to the use
of the information described herein.
3. ABLIC Inc. is not responsible for damages caused by the incorrect information described herein.
4. Be careful to use the products within their specified ranges. Pay special attention to the absolute maximum ratings,
operation voltage range and electrical characteristics, etc.
ABLIC Inc. is not responsible for damages caused by failures and / or accidents, etc. that occur due to the use of the
products outside their specified ranges.
5. When using the products, confirm their applications, and the laws and regulations of the region or country where they
are used and verify suitability, safety and other factors for the intended use.
6. When exporting the products, comply with the Foreign Exchange and Foreign Trade Act and all other export-related
laws, and follow the required procedures.
7. The products must not be used or provided (exported) for the purposes of the development of weapons of mass
destruction or military use. ABLIC Inc. is not responsible for any provision (export) to those whose purpose is to
develop, manufacture, use or store nuclear, biological or chemical weapons, missiles, or other military use.
8. The products are not designed to be used as part of any device or equipment that may affect the human body, human
life, or assets (such as medical equipment, disaster prevention systems, security systems, combustion control
systems, infrastructure control systems, vehicle equipment, traffic systems, in-vehicle equipment, aviation equipment,
aerospace equipment, and nuclear-related equipment), excluding when specified for in-vehicle use or other uses. Do
not apply the products to the above listed devices and equipments without prior written permission by ABLIC Inc.
Especially, the products cannot be used for life support devices, devices implanted in the human body and devices
that directly affect human life, etc.
Prior consultation with our sales office is required when considering the above uses.
ABLIC Inc. is not responsible for damages caused by unauthorized or unspecified use of our products.
9. Semiconductor products may fail or malfunction with some probability.
The user of the products should therefore take responsibility to give thorough consideration to safety design including
redundancy, fire spread prevention measures, and malfunction prevention to prevent accidents causing injury or
death, fires and social damage, etc. that may ensue from the products' failure or malfunction.
The entire system must be sufficiently evaluated and applied on customer's own responsibility.
10. The products are not designed to be radiation-proof. The necessary radiation measures should be taken in the
product design by the customer depending on the intended use.
11. The products do not affect human health under normal use. However, they contain chemical substances and heavy
metals and should therefore not be put in the mouth. The fracture surfaces of wafers and chips may be sharp. Be
careful when handling these with the bare hands to prevent injuries, etc.
12. When disposing of the products, comply with the laws and ordinances of the country or region where they are used.
13. The information described herein contains copyright information and know-how of ABLIC Inc.
The information described herein does not convey any license under any intellectual property rights or any other
rights belonging to ABLIC Inc. or a third party. Reproduction or copying of the information from this document or any
part of this document described herein for the purpose of disclosing it to a third-party without the express permission
of ABLIC Inc. is strictly prohibited.
14. For more details on the information described herein, contact our sales office.
2.0-2018.01
www.ablicinc.com
Mouser Electronics
Authorized Distributor
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ARVT2G S-8520C36MC-BRVT2G S-8520A36MC-AVVT2G S-8521B36MC-ATVT2G S-8521D36MC-BXVT2G S-
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AVQT2G S-8520B31MC-ARQT2G S-8520D31MC-BVQT2G S-8521A31MC-AXQT2G S-8521C31MC-BTQT2G S-
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BYJT2G S-8521E50MC-BMJT2G S-8521A50MC-AYJT2G S-8521C50MC-BUJT2G S-8520D50MC-BWJT2G S-
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ATKT2G S-8521C25MC-BTKT2G S-8521A25MC-AXKT2G S-8520B25MC-ARKT2G S-8520F25MC-BNKT2G S-
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ATTT2G S-8521C34MC-BTTT2G S-8521A34MC-AXTT2G S-8520F34MC-BNTT2G S-8520B34MC-ARTT2G S-
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ATFT2G S-8521D20MC-BXFT2G S-8520E20MC-BJKT2G S-8521A29MC-AXOT2G S-8521C29MC-BTOT2G S-
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BRRT2G S-8520A32MC-AVRT2G
