S-1172 Series
www.sii-ic.com
HIGH RIPPLE-REJECTION LOW DROPOUT
HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
© Seiko Instruments Inc., 2007-2013 Rev.2.2_00
Seiko Instruments Inc. 1
The S-1172 Series, develo ped by using C MOS technology, is a positive volta ge regulator with a super low dropout volta ge,
high-accuracy output voltage and lo w current consum ption.
The S-1172 Series provides the very l ow dr opout voltage and the large outp ut current due to the built-in transistor with low
on-resistance. The S-117 2 Series includes an overcurrent protec tion circuit that prevents the load cur rent from exceeding
the current capacit ance of the output transi stor, a thermal shutdown circuit that prevent s damage due to overheating, and
an inrush current limit circuit to limit the exc essive i nrush current ge ner ated at po wer-on.
The ON/OFF circuit ensures longer battery life. Compared with the voltage regulators using the conventional CMOS
technology, a large variet y of capacitors are availa bl e, inclu ding sma ll cer amic capac itor s.
High heat radiation HSOP-6 and sm al l SOT-89-5 package s real ize hig h- dens it y mounting.
Features
• Output voltage: 1.0 V to 5.0 V, selectable i n 0. 05 V step
• Input voltage: 1.5 V to 5.5 V
• Output voltage accurac y: ±1.0% (1.0 V to 1.45 V output produ ct: ±15 mV)
• Dropout voltage: 70 mV typ. (3.0 V output product, IOUT = 300 mA)
• Current consumption: During operation: 70 μA typ., 90 μA max. (3.0 V output product)
During power-off: 0.1 μA typ., 1.0 μA max.
• Output current: Possible to output 1000 mA ( 3.0 V out put pr oduct, VIN ≥ VOUT(S) + 1.0 V)*1
• Input and output capacit ors: A ceramic capacitor of 4.7 μF or more can be used.
• Ripple rejection: 70 dB typ. (1.0 V output prod uct, f = 1.0 kHz)
• Built-in overcurrent protecti on circuit: Limits overcurrent of out put tr ansist or.
• Built-in thermal shutdown circuit: Prevents damage caused b y heat.
• Built-in inrush current limit circuit: Limits excessive inrush current at power-on.
• Built-in ON/OFF circuit: Ensures Long battery life.
• Operation temperature ran ge: Ta = −40°C to +85°C
• Lead-free, Sn 100%, halogen-free*2
*1. Attention should be pai d to the power dissipation of the package when the output current is l arge.
*2. Refer to “ Product Name Structure” for details.
Applications
• Constant-voltage power supply for batter y-po wered device
• Constant-voltage power supply for TV, notebo ok PC and home electric applianc e
• Constant-voltage power suppl y for portable equipm ent
Packages
• SOT-89-5
• HSOP-6
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
2
Block Diagram
Reference
voltage circuit
ON/OFF
*1
ON/OFF circuit +
−
VIN
VSS
VOUT
O v erc u rren t
protection circuit
Therm al shutdown circuit
*1. Parasitic diode
Figure 1
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 3
Product Name Structure
Users can select the product type, output voltage, and package type for the S-1172 Series. Refer to “1. Product
name” regarding the contents of product name, “2. Packages” regarding the package drawings and “3. Product
name list” regarding details of prod uct nam e.
1. Product name
S-1172 x xx - xxxx x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
Package abbreviation and packing specifications
*1
U5T1: SOT-89-5, Tape
E6T1: HSOP-6, Tape
Output voltage
*2
10 to 50
(e.g., when the output voltage is 1.0 V, it is expressed as 10.)
Product type
*3
A: ON/OFF pin negative logic
B: ON/OFF pin positive logic
*1. Refer to the tape drawing.
*2. If you request the product which has 0.05 ste p, contact our sal es off ice.
*3. Refer to “3. ON/OFF pin” in “ Operation”.
2. Packages
Drawing Code
Package Name Package Tape Reel Land
SOT-89-5 UP005-A-P-SD UP005-A-C-S D UP005-A-R-SD ⎯
Environmental code = G FH006-A-P-SD FH006-A-C-SD FH006-A-R-SD FH006-A-L-SD
HSOP-6 Environmental code = U FH006-A-P-SD FH006-A-C-SD FH006-A-R-S1 FH006-A-L-SD
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
4
3. Product name list
Table 1
Output Voltage SOT-89-5 HSOP-6
1.0 V ±15 mV S-1172B10-U5T1x S-1172B10-E6T1x
1.1 V ±15 mV S-1172B11-U5T1x S-1172B11-E6T1x
1.15 V ±15 mV ⎯ S-1172B1B-E6T 1x
1.2 V ±15 mV S-1172B12-U5T1x S-1172B12-E6T1x
1.25 V ±15 mV S-1172B1C-U5T1x S-1172B1C-E6T1x
1.3 V ±15 mV S-1172B13-U5T1x S-1172B13-E6T1x
1.4 V ±15 mV S-1172B14-U5T1x S-1172B14-E6T1x
1.5 V ±1.0% S-1172B15-U5T1x S-1172B15-E6T1x
1.6 V ±1.0% S-1172B16-U5T1x S-1172B16-E6T1x
1.7 V ±1.0% S-1172B17-U5T1x S-1172B17-E6T1x
1.8 V ±1.0% S-1172B18-U5T1x S-1172B18-E6T1x
1.85 V ±1.0% S-1172B1J-U5T1x S-1172B1J-E6T1x
1.9 V ±1.0% S-1172B19-U5T1x S-1172B19-E6T1x
2.0 V ±1.0% S-1172B20-U5T1x S-1172B20-E6T1x
2.1 V ±1.0% S-1172B21-U5T1x S-1172B21-E6T1x
2.2 V ±1.0% S-1172B22-U5T1x S-1172B22-E6T1x
2.3 V ±1.0% S-1172B23-U5T1x S-1172B23-E6T1x
2.4 V ±1.0% S-1172B24-U5T1x S-1172B24-E6T1x
2.5 V ±1.0% S-1172B25-U5T1x S-1172B25-E6T1x
2.6 V ±1.0% S-1172B26-U5T1x S-1172B26-E6T1x
2.7 V ±1.0% S-1172B27-U5T1x S-1172B27-E6T1x
2.8 V ±1.0% S-1172B28-U5T1x S-1172B28-E6T1x
2.85 V ±1.0% S-1172B2J-U5T1x S-1172B2J-E6T1x
2.9 V ±1.0% S-1172B29-U5T1x S-1172B29-E6T1x
3.0 V ±1.0% S-1172B30-U5T1x S-1172B30-E6T1x
3.1 V ±1.0% S-1172B31-U5T1x S-1172B31-E6T1x
3.2 V ±1.0% S-1172B32-U5T1x S-1172B32-E6T1x
3.3 V ±1.0% S-1172B33-U5T1x S-1172B33-E6T1x
3.4 V ±1.0% S-1172B34-U5T1x S-1172B34-E6T1x
3.5 V ±1.0% S-1172B35-U5T1x S-1172B35-E6T1x
3.6 V ±1.0% S-1172B36-U5T1x S-1172B36-E6T1x
3.7 V ±1.0% S-1172B37-U5T1x S-1172B37-E6T1x
3.8 V ±1.0% S-1172B38-U5T1x S-1172B38-E6T1x
3.9 V ±1.0% S-1172B39-U5T1x S-1172B39-E6T1x
4.0 V ±1.0% S-1172B40-U5T1x S-1172B40-E6T1x
4.1 V ±1.0% S-1172B41-U5T1x S-1172B41-E6T1x
4.2 V ±1.0% S-1172B42-U5T1x S-1172B42-E6T1x
4.3 V ±1.0% S-1172B43-U5T1x S-1172B43-E6T1x
4.4 V ±1.0% S-1172B44-U5T1x S-1172B44-E6T1x
4.5 V ±1.0% S-1172B45-U5T1x S-1172B45-E6T1x
4.6 V ±1.0% S-1172B46-U5T1x S-1172B46-E6T1x
4.7 V ±1.0% S-1172B47-U5T1x S-1172B47-E6T1x
4.8 V ±1.0% S-1172B48-U5T1x S-1172B48-E6T1x
4.9 V ±1.0% S-1172B49-U5T1x S-1172B49-E6T1x
5.0 V ±1.0% S-1172B50-U5T1x S-1172B50-E6T1x
Remark 1. Please contact our sales offic e for products with an out put voltage other than those
specified abov e or t ype A pro ducts.
2. x: G or U
3. Please select products of en vironm ent al code = U for Sn 100 %, halo ge n-free pr odu cts.
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 5
Pin Configurations
Table 2
Pin No. Symbol Description
1 ON/OFF ON/OFF pin
2 VSS GND pin
3
NC*1 No connection
4 VIN Input voltage pin
5 VOUT Output voltage pin
5 4
1 3 2
SOT-89-5
Top vie
w
*1. The NC pin is electrically open.
The NC pin can be connected to the VIN pin or the VSS pin.
Figure 2
Table 3
Pin No. Symbol Description
1 VOUT Output voltage pin
2 VSS GND pin
3 ON/OFF ON/OFF pin
4
NC*1 No connection
5 VSS GND pin
6 VIN Input voltage pin
HSOP-6
Top view
4 5
6
3 2
1
*1. The NC pin is electrically open.
The NC pin can be connected to the VIN pin or the VSS pin.
Figure 3
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
6
Absolute Maximum Ratings
Table 4 (Ta = +25°C unless other wise specifie d
)
Item Symbol Absolute Maximum Rating Unit
VIN V
SS − 0.3 to VSS + 6 V
Input voltage VON/OFF V
SS − 0.3 to VIN + 0.3 V
Output voltage VOUT V
SS − 0.3 to VIN + 0.3 V
SOT-89-5 1000*1 mW
Power
dissipation HSOP-6 PD 1900*2 mW
Operation ambient temperature Topr −40 to +85 °C
Storage temperature Tstg −40 to +125 °C
*1. When mounted on board
[Mounted board]
(1) Board size: 114.3 mm × 76.2 mm × t1.6 mm
(2) Name: JEDEC STANDARD51-7
*2. When mounted on board
[Mounted board]
(1) Board size: 50 mm × 50 mm × t1.6 mm
(2) Board material: Glass epoxy resin (two layers)
(3) Wiring ratio: 50%
(4) Test conditions: When mounted on board ( wind speed : 0 m/s)
(5) Land pattern: Refer to the recommended land p attern (dra wing code : FH006- A-L-S D)
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.
50 100 150
2400
1600
800
2000
1200
400
SOT-89-5
HSOP-6
0
0
Power dissipation (PD) [mW]
Ambient temperature (Ta) [°C]
Figure 4 Power Dissipation of Packag e (Wh en Moun ted o n Bo ard)
Table 5
Condition Power Dissipation Thermal Resistance Value (θj−a)
HSOP-6 (When mounted on boar d) 1900 mW 53°C/W
SOT-89-5 (When mounted o n boar d) 1000 mW 100°C/W
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 7
Power Dissipation of HSOP-6 (Ref er ence)
Power dissipation of pack age differs depe nding on th e mountin g conditi ons.
Consider the po wer dissipat ion char acteri stics und er the fo llo wing conditi ons as r eference.
[Mounted board]
(1) Board size: 50 mm × 50 mm × t1.6 mm
(2) Board material: Glass epoxy resin (two layers)
(3) Wiring ratio: 90%
(4) Test conditions: When mounted on board ( wind speed : 0 m/s)
(5) Land pattern: Refer to the recommended land p attern (dra wing code : FH006- A-L-S D)
050 100 150
2400
1600
0
Power dissipation (PD) [mW]
Ambient temperature (Ta) [°C]
800
2000
1200
400
Figure 5 Power Dissipation of Packag e (Wh en Moun ted o n Bo ard)
Table 6
Condition Power Dissipation (R efer enc e) T hermal Res istance Val ue ( θj−a)
HSOP-6 (When mounted on boar d) 2000 mW 50°C/W
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
8
Electrical Characteristics
Table 7 (1 / 2) (Ta = +25°C unless other wise specifie d)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
1.0 V
≤
V
OUT(S)
< 1.5 V V
OUT(S)
−
0.015 V
OUT(S)
V
OUT(S)
+ 0.015 V 1
V
IN
= V
OUT(S)
+ 1.0 V,
I
OUT
= 100 mA 1.5 V
≤
V
OUT(S)
≤
4.5 V V
OUT(S)
×
0.99 V
OUT(S)
V
OUT(S)
×
1.01 V 1
Output voltage
*1
V
OUT(E)
V
IN
= 5.5 V,
I
OUT
= 100 mA 4.5 V < V
OUT(S)
≤
5.0 V V
OUT(S)
×
0.99 V
OUT(S)
V
OUT(S)
×
1.01 V 1
V
IN
≥
V
OUT(S)
+ 1.0 V 1.0 V
≤
V
OUT(S)
≤
4.5 V 1000
*5
−
−
mA 3
Output current
*2
I
OUT
V
IN
= 5.5 V 4.5 V < V
OUT(S)
≤
5.0 V 1000
*5
−
−
mA 3
1.0 V
≤
V
OUT(S)
< 1.1 V 0.5 0. 54 0. 5 8 V 1
1.1 V
≤
V
OUT(S)
< 1.2 V
−
0.44 0.48 V 1
1.2 V
≤
V
OUT(S)
< 1.3 V
−
0.34 0.38 V 1
1.3 V
≤
V
OUT(S)
< 1.4 V
−
0.24 0.28 V 1
1.4 V
≤
V
OUT(S)
< 1.5 V
−
0.14 0.18 V 1
1.5 V
≤
V
OUT(S)
< 2.6 V
−
0.10 0.15 V 1
I
OUT
= 300 mA
2.6 V
≤
V
OUT(S)
≤
5.0 V
−
0.07 0.10 V 1
1.0 V
≤
V
OUT(S)
< 1.1 V
−
0.9
−
V 1
1.1 V
≤
V
OUT(S)
< 1.2 V
−
0.8
−
V 1
1.2 V
≤
V
OUT(S)
< 1.3 V
−
0.7
−
V 1
1.3 V
≤
V
OUT(S)
< 1.4 V
−
0.6
−
V 1
1.4 V
≤
V
OUT(S)
< 1.5 V
−
0.5
−
V 1
1.5 V
≤
V
OUT(S)
< 2.0 V
−
0.4
−
V 1
2.0 V
≤
V
OUT(S)
< 2.6 V
−
0.32
−
V 1
Dropout voltage
*3
V
drop
I
OUT
= 1000 mA
2.6 V
≤
V
OUT(S)
≤
5.0 V
−
0.23
−
V 1
1.0 V
≤
V
OUT(S)
< 3.6 V
−
0.05 0.2 %/V 1
V
OUT(S)
+ 0.5 V
≤
V
IN
≤
5.5 V,
I
OUT
= 100 mA 3.6 V
≤
V
OUT(S)
≤
4.8 V
−
2.5 10 mV 1
Line regulation
OUTIN
1OUT
VV V
•Δ
Δ
5.3 V
≤
V
IN
≤
5.5 V,
I
OUT
= 100 mA 4.8 V < V
OUT(S)
≤
5.0 V
−
2.5 10 mV 1
V
IN
= V
OUT(S)
+ 1.0 V,
1 mA
≤
I
OUT
≤
300 mA 1.0 V
≤
V
OUT(S)
≤
4.5 V
−
15 30 mV 1
Load regulation
Δ
V
OUT2
V
IN
= 5.5 V,
1 mA
≤
I
OUT
≤
300 mA 4.5 V < V
OUT(S)
≤
5.0 V
−
15 30 mV 1
V
IN
= V
OUT(S)
+ 1.0 V,
I
OUT
= 100 mA,
−
40°C
≤
Ta
≤
85°C 1.0 V
≤
V
OUT(S)
≤
4.5 V
−
±
130
−
ppm/
°
C1
Output voltage
temperature
coefficient
*4
OUT
OUT
VTaV
•Δ
Δ
V
IN
= 5.5 V,
I
OUT
= 100 mA,
−
40°C
≤
Ta
≤
85°C 4.5 V < V
OUT(S)
≤
5.0 V
−
±
130
−
ppm/
°
C1
V
IN
=
V
OUT(S)
+
1.0 V, ON/ OF F pi n
=
ON,
no load, 1.0 V
≤
V
OUT(S)
< 1.8 V
−
90 110
μ
A 2
V
IN
=
V
OUT(S)
+
1.0 V, ON/ OF F pi n
=
ON,
no load, 1.8 V
≤
V
OUT(S)
≤
4.5 V
−
70 90
μ
A 2
Current
consumption
during operation I
SS1
V
IN
=
5.5 V, ON/OFF pin
=
ON,
no load, 4.5 V < V
OUT(S)
≤
5.0 V
−
70 90
μ
A 2
V
IN
=
V
OUT(S)
+
1.0 V,
ON/OFF pin
=
OFF,
no load 1.0 V
≤
V
OUT(S)
≤
4.5 V
−
0.1 1.0
μ
A 2
Current
consumption
during power-off I
SS2
V
IN
=
5.5 V,
ON/OFF pin
=
OFF,
no load 4.5 V < V
OUT(S)
≤
5.0 V
−
0.1 1.0
μ
A 2
Input voltage V
IN
−
1.5
−
5.5 V
−
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 9
Table 7 (2 / 2) (Ta = +25°C unless other wise specifie d)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
V
IN
= V
OUT(S)
+ 1.0 V,
R
L
= 1.0 k
Ω
,
determined by V
OUT
output level
1.0 V
≤
V
OUT(S)
≤
4.5 V 1.0
−
−
V 4
ON/OFF pin i np ut
voltage “H” V
SH
V
IN
= 5.5 V,
R
L
= 1.0 k
Ω
,
determined by V
OUT
output level
4.5 V < V
OUT(S)
≤
5.0 V 1.0
−
−
V 4
V
IN
= V
OUT(S)
+ 1.0 V,
R
L
= 1.0 k
Ω
,
determined by V
OUT
output level
1.0 V
≤
V
OUT(S)
≤
4.5 V
−
−
0.3 V 4
ON/OFF pin i np ut
voltage “L” V
SL
V
IN
= 5.5 V,
R
L
= 1.0 k
Ω
,
determined by V
OUT
output level
4.5 V < V
OUT(S)
≤
5.0 V
−
−
0.3 V 4
ON/OFF pin i np ut
current “H” I
SH
V
IN
= 5.5 V, V
ON/OFF
= 5.5 V
−
0.1
−
0.1
μ
A 4
ON/OFF pin i np ut
current “L” I
SL
V
IN
= 5.5 V, V
ON/OFF
= 0 V
−
0.1
−
0.1
μ
A 4
1.0 V
≤
V
OUT(S)
< 1.2 V
−
70
−
dB 5
1.2 V
≤
V
OUT(S)
≤
3.0 V
−
65
−
dB 5
V
IN
= V
OUT(S)
+ 1.0 V,
f = 1 kHz,
Δ
V
rip
= 0.5 Vrms,
I
OUT
= 100 mA 3.0 V < V
OUT(S)
≤
4.5 V
−
60
−
dB 5
Ripple rejection
RR
V
IN
= 5.5 V,
f = 1 kHz,
Δ
V
rip
= 0.5 Vrms,
I
OUT
= 100 mA
4.5 V < V
OUT(S)
≤
5.0 V
−
60
−
dB 5
V
IN
=
V
OUT(S)
+
1.0 V,
ON/OFF pin
=
ON,
V
OUT
=
0 V 1.0 V
≤
V
OUT(S)
≤
4.5 V
−
200
−
mA 3
Short-cir c uit curr ent I
SHORT
V
IN
=
5.5 V,
ON/OFF pin
=
ON,
V
OUT
=
0 V 4.5 V < V
OUT(S)
≤
5.0 V
−
200
−
mA 3
Thermal shutdown
detecti o n te mp erat ur e T
SD
Junction temperature
−
150
−
°
C
−
Thermal shutdown
releas e t em per a tur e T
SR
Junction temperature
−
120
−
°
C
−
*1. V
OUT(S) : Set output voltage
VOUT(E) : Actual output voltage
Output voltage when fixing IOUT (= 100 mA) and inputtin g VOUT (S) + 1.0 V or 5.5 V
*2. The output current at which the o utput voltage b ecomes 9 5% of VOUT(E) after gradua lly i ncreasin g the outp ut current.
*3. V
drop = VIN1 − (VOUT3 × 0.98)
V
OUT3 is the output voltage when VIN = VOUT(S) + 1.0 V or 5.5 V, and IOUT = 300 mA or 1000 mA.
VIN1 is the input voltage at which the output voltage becomes 98% of VOUT3 after gradually decreasing the input
voltage.
*4. A change in the temperatur e of the out put v oltage [mV/°C] is calcu lat ed u sing the fol lo wing equ ation.
ΔVOUT
ΔTa []
mV/°C *1 = VOUT(S) []
V*2 × ΔVOUT
ΔTa•VOUT []
ppm/°C *3 ÷ 1000
*1. Change in temperature of outp ut voltage
*2. Set output voltage
*3. Output voltage temperature co efficient
*5. The output current ca n be at least this valu e.
Due to restrictions on the package power dissipation, this value may not be satisfied. Attention should be paid to
the power dissipation of the p ackage when the output current is large.
This specification is g uar ant e ed by design.
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
10
Test Circuits
1. +
VOUT
VIN
VSS
+
V
A
ON/OFF
Set to ON
Figure 6
2.
VOUT
VIN
VSS
ON/OFF
Set to V
IN
or GND
+
A
Figure 7
3.
Set to ON
VOUT
VIN
VSS
+
V
+
A
ON/OFF
Figure 8
4.
VOUT
VIN
VSS
+
V
ON/OFF
+
A R
L
Figure 9
5.
VOUT
VIN
VSS
+
V
ON/OFF RL
Set to ON
Figure 10
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 11
Standard Circuit
C
IN*1
C
L*2
Input Output
GND
Single GND
VOUT
VIN
VSS
ON/OFF
*1. C
IN is a capacitor f or sta bilizi ng t he inp ut.
*2. A ceramic capacitor of 4. 7 μF or more can b e used as CL.
Figure 11
Caution The above connection diagram and constant will not guarantee successful operation. Perform
thorough evaluation using the actual application to set the constant.
Condition of Application
Input capacit or (CIN): 4.7 μF or more
Output capacitor (CL): 4.7 μF or more
Caution 1. Set input capacitor (CIN) and output capacitor (CL) as CIN = CL.
2. Generally a series regulator may cause oscillation, depending on the selection of external
parts. Confirm that no oscillation occurs in the application for which the above capacitors are
used.
Selection of Input and Output Capacitors (CIN, CL)
The S-1172 Series requires an output capacitor between the VOUT pin and the VSS pin for phase compensation.
Operation is stabilized by a ceramic capacitor with an output capacitance of 4.7 μF or more over the entire
temperature range. When using an OS capacitor, a tantalum capacitor, or an aluminum electrolytic capacitor, the
capacitance must be 4. 7 μF or more.
The values of output overshoot and undershoot, which are transient response characteristics, vary depending on the
value of output capac it or.
The required v alue of ca pac it ance f or t he in put ca pacit or d if fers de pe ndin g on t he ap pl ic at io n.
Set the value for input capac i t or (CIN) and o utput capac it or (CL) as follows.
CIN ≥ 4.7 μF
CL ≥ 4.7 μF
CIN = CL
Caution The S-1172 Series may oscillate if setting the value as CIN ≥ 4.7 μF, CL ≥ 4.7 μF, CIN < CL.
Define the values by sufficient evaluation including the temperature characteristics under the usage
condition.
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
12
Explanation of Terms
1. Low dropout voltage regulator
This voltage regul ator h as the lo w dropout v olta ge d ue to it s bui lt -in l o w on-resistanc e t ransist or.
2. Output voltage (VOUT)
The accuracy of the output voltage is ensured at ±1.0% or ±15 mV*2 under the specified conditions of fixed input
voltage*1, fixed out put c urre nt , and f i xe d temperature.
*1. Differs dependi ng on t he product .
*2. When V
OUT < 1.5 V : ±15 mV, when 1.5 V ≤ VOUT : ±1.0%
Caution If the above conditions change, the output voltage value may vary and exceed the accuracy
range of the output voltage. Refer to “ Electrical Characteristics” and “ Characteristics
(Typical Data)” for details.
3. Line regulation ⎝
⎛⎠
⎞
ΔVOUT1
ΔVIN•VOUT
Indicates the dependency of the output voltage against the input voltage. That is, the value shows how much the
output voltage chan ge s due t o a ch ange i n t he i nput volta g e aft er f ixi ng o ut put curr ent c onst a nt.
4. Load regulation (ΔVOUT2)
Indicates the dependency of the output voltage against the output current. That is, the value shows how much the
output voltage chan ge s due t o a ch ange i n t he o utput current after fi xi ng out put curre nt const a nt.
5. Dropout voltage (Vdrop)
Indicates the difference between input voltage (VIN1) and the output voltage when; decreasing input voltage (VIN)
gradually until the output voltage has dropped out to the value of 98% of output voltage (VOUT3), which is at
VIN = VOUT(S) + 1.0 V or 5.5 V.
Vdrop = VIN1 − (VOUT3 × 0.98)
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 13
6. Output voltage temperature coefficient ⎝
⎛⎠
⎞
ΔVOUT
ΔTa•VOUT
The shaded area in Figure 12 is the range where VOUT varies in the operation temper ature range when the output
voltage temperature c oefficie nt is ±1 30 p pm /°C.
Example of S-1172B30 typ. product
−40 +25
+0.39 mV/°C
V
OUT
[V]
+85 Ta [°C]
V
OUT(E)*1
−0.39 mV/°C
*1. VOUT(E) is the value of the output voltage meas ured at T a = +25°C.
Figure 12
A change in the temperatur e of the out put v oltage [m V/°C] is calculat ed u sing th e following equation.
ΔVOUT
ΔTa []
mV/°C *1 = VOUT(S) []
V*2 × ΔVOUT
ΔTa•VOUT []
ppm/°C *3 ÷ 1000
*1. Change in temperature of outp ut voltage
*2. Set output voltage
*3. Output voltage temperature co efficient
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
14
Operation
1. Basic operation
Figure 13 shows the block diagram of t he S -117 2 Ser ies.
The error amplifier compares the reference voltage (Vref) with feedback voltage (Vfb), which is the output voltage
resistance-divided by feedback resistors (Rs and Rf). I t suppl ies the gate volt a ge necessary to m aintain the con st ant
output voltage whic h is n ot influenced b y the inp ut volt a ge and tem per at u re cha ng e, t o the o utput t ra ns ist or.
*1
*1. Parasitic diode
VSS
Current
supply
−
+
Vfb
Vref
VIN
VOUT
Rf
Rs
Error
amplifier
Reference voltage
circuit
Figure 13
2. Output transistor
In the S-1172 Series, a low on-resistance P -cha nnel MOS F ET is used as the out put tra nsistor.
Be sure that VOUT does not exceed VIN + 0. 3 V to prevent the voltage reg ulator from being dama ged due to reverse
current flowing from the VOUT pin through a parasitic diode to the VIN pin, when the potential of VOUT became
higher than VIN.
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 15
3. ON/OFF pin
This pin starts and st ops th e regu lat or.
When the ON/OFF pin is set to OFF level, the e ntire i ntern al circuit stops operati ng, an d t he built-i n P-chan nel MOS
FET output transistor between the VIN pin and the VOUT pin is turned off, reducing current consumption
significantly. The VOUT pin is set to the VSS level by the internal dividing resistor of several hundred kΩ between
the VOUT pin and the VSS pin.
Note that the c urrent c ons um pt ion increases when a volt a ge of 0. 3 V t o 1. 0 V is a ppl ied t o t he ON/O FF pin.
The ON/OFF pin is configured as shown in Figure 14. Since the ON/OFF pin is neither pulled down nor pulled up
internally, do not use it in the floating status. When not using the ON/OFF pin, connect it to the VSS pin in the
product A type, and conn ect i t t o the VI N pin in B t ype.
Table 8
Product Type ON/OFF Pin Internal Circuit VOUT Pin Voltage Current Co nsumpt io n
A “L”: ON Operate Set value ISS1
A “H”: OFF Stop VSS level ISS2
B “L”: OFF Stop VSS level ISS2
B “H”: ON Operate Set value ISS1
VSS
ON/OFF
VIN
Figure 14
4. Overcurrent protection circuit
The S-1172 Series includes an overcurrent protection circuit having the characteristics shown in “1. Output
voltage vs. Output cu rrent (When load current increas es) (Ta = +25°C)” in “ Characteristics (Typical Data)”,
in order to prot ect the output transist or against an excessive o utput current and short circuiting between the VOUT
pin and the VSS pin. The current when the output pin is short-circuited (ISHORT) is internally set at approx. 200 mA
typ., and the normal v al ue is restore d for t he out put volt ag e, if releasi ng a short circ uit once.
Caution This overcurrent protection circuit does not work as for thermal protection. If this IC long keeps
short circuiting inside, pay attention to the conditions of input voltage and load current so that,
under the usage conditions including short circuit, the loss of the IC will not exceed power
dissipation of the packag e.
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
16
5. Thermal shutdown circuit
The S-1172 Series has a thermal shutdown circuit to protect the device from damage due to overheat. When the
junction temperature rises to 150°C typ., the thermal shutdown circuit operates to stop regulating. When the
junction temperature d rop s to 120 °C t yp., the thermal shutdo wn circuit is release d to res tart regulati ng.
Due to self-heating of the S-117 2 Series, if the thermal shutdown circuit starts operatin g, it stops regulating so that
the output voltage drops. When regulation stops, the S-1172 Series does not itself generate heat so that the IC’s
temperature drops. Wh en the temperatur e drops, the ther mal shutd own circuit is re leased to r estart regulating, th us
the S-1172 Series gene rates heat aga in. Repeatin g this pr oced ure makes waveform of the output volt age puls e-like
form. Stop or restart of regulation continues unless decreasing either or both of the input voltage and the output
current in order to reduce the internal p o wer consumptio n, or decr eas ing the am bi ent temperature.
Table 9
Thermal Shutdown Circuit VOUT Pin Voltage
Operation: 150°C typ.*1 VSS level
Release: 120°C t yp.*1 Set value
*1. Junction temperature
6. Inrush current limit circuit
The S-1172 Series has a built-in inrush current limit circuit to limit the inrush current generated at power-on or at
the time when the ON/OFF pin is set to ON. This circuit limits the inrush current (500 mA, typ.) immediately after
power-on or from the time when the ON/OFF pin is set to ON until the specified time (100 μs min.) which is set
internally.
Caution The junction temperature drops to 120°C typ. by the operation of thermal shutdown circuit, after
stopping regulation, the circuit is released to restart regulation; in this case, note that the period
to limit inrush current may become shorter (10 μs min.).
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 17
Precautions
• Wiring patterns for the VIN pin, the VOUT pin and GND should be designed so that the impedance is low. When
mounting an output capacitor between the VOUT pin and the VSS pin (CL) and a capacitor for stabilizing the input
between the VIN pin and the VSS pin (CIN), the distance from the capacitors to these pins should be as short as
possible.
• Note that generally the output voltage may increase when a series regulator is used at low load current (1.0 mA or
less).
• Note that generally the output voltage may increase due to the leakage current from an output driver when a series
regulator is used at h igh t em perat ure.
• Note th at the output voltage may increase due t o the le akage current f rom an outp ut driver even if the ON/O FF pin is
at OFF level when a seri es re gul ator is use d at hig h temp er ature.
• Generally a series regulator may cause oscillation, depending on the selection of external parts. The following
conditions are recommended for the S-1172 Series. However, be sure to perform sufficient evaluation under the
actual usage conditions for selection, including evaluation of temperature characteristics. Refer to “5. Example of
equivalent series resistance vs. Output current characteristics (Ta = +25°C)” in “ Reference Data” for the
equivalent series resist anc e (RESR) of t he ou tput capacit or.
Input capacit or (CIN): 4.7 μF or more
Output capacitor (CL): 4.7 μF or more
• The voltage regulator may oscillate when the impedance of the power supply is high and the input capacitance is
small or an input capacit or is not connect ed. Note th at the volta ge reg ulator ma y oscil lat e when the val ue of t he inp ut
capacitor is great er t han t h at of t he outp ut c apac itor.
• Ringing may occur when these three conditions below are satisfied. Before selecting an input capacitor, be sure to
evaluate suffici ent l y under the actual usa ge condit io ns, in cl uding t h e temp eratur e ch arac terist ics.
The power suppl y indu ctance is high.
The load current is 100 mA o r more.
The differenc e between the input volt ag e an d the o ut put v o lt ag e is clos e t o t he valu e of dropout vo lta g e.
• If the out put c a pacit anc e is s mall, po wer s uppl y’ s f l uctuation and the cha ract eristi cs of l oad f luct u ati on bec ome wors e.
Sufficiently evaluate the output voltage’s fluctuation with the actual device.
• Overshoot may occur in t he outp ut voltage moment arily if the voltage is r apidly ra ised at po wer-on or when the po wer
supply fluctuates. Suffici ent l y eval uate t h e out put volt ag e at power-on with the actual device.
• The application conditions for the input voltage, the output voltage, and the load current should not exceed the
package power dissi pati on.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circ uit.
• In determining the output current, attention should be paid to the output current value specified in Table 7 in
“ Electrical Characteristics” and footn ot e *5 of the table.
• SI I claims no responsi bilit y for any dis putes arisi ng out of or in connect ion with an y infri ngeme nt by products i ncluding
this IC of pate nts o wned b y a third part y.
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
18
Characteristics (Typical Data)
1. Output voltage vs. Output current (When load current increases) (Ta = +25°C)
S-1172B10 S-1172B30
400 800 1200
V
OUT
[V]
I
OUT
[mA]
0
1.2
0.6
0.4
0.8
1.0
1600
0
0.2
2000
V
IN
= 1.5 V
2.0 V
3.0 V
5.5 V
400 800 1200
VOUT [V]
IOUT [mA]
0
3.5
1.0
2.0
1.5
2.5
3.0
1600
0
0.5
2000
4.0 V
5.5 V
VIN = 3.5 V
5.0 V
S-1172B50
400 800 1200
VOUT [V]
IOUT [mA]
0
6
3
2
4
5
1600
0
1
2000
5.5 V
VIN = 5.3 V
Remark In determining the output current, attention
should be paid to the following.
1. The minimum output current value and
footnote *5 of Table 7 in “ Electrical
Characteristics”
2. Power dissipation of the package
2. Output voltage vs. Input voltage (Ta = +25°C)
S-1172B10 S-1172B30
1.0 1.5 2.0
V
OUT
[V]
V
IN
[V]
0.5
1.1
0.5
0.8
0.7
0.9
1.0
2.5 3.0
0.6
I
OUT
= 1 mA
50 mA
100 mA
3.0 3.5 4.0
V
OUT
[V]
V
IN
[V]
2.5
3.1
2.6
2.8
2.7
2.9
3.0
4.5 5.0
2.5
I
OUT
= 1 mA
50 mA
100 mA
S-1172B50
4.7 4.9 5.1
VOUT [V]
VIN [V]
4.5
5.1
4.6
4.8
4.7
4.9
5.0
5.3
4.5
5.5
IOUT = 1 mA
100 mA
50 mA
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 19
3. Dropout voltage vs. Output current
S-1172B10 S-1172B30
-
°
°
°
-
°
°
°
S-1172B50
-
°
°
°
4. Dropout voltage vs. Set output voltage
123
V
drop
[V]
V
OUT(S)
[V]
05
0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
46
I
OUT
= 1000 mA
500 mA
300 mA
10 mA
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
20
5. Output voltage vs. Ambient temperature
S-1172B10 S-1172B30
−25 025
V
OUT
[V]
Ta [°C]
−40
1.050
1.075
75
1.025
1.000
0.975
0.950
0.925
0.900 50 85
1.100
−25 0 25
VOUT [V]
Ta [°C]
−40
3.10
3.15
75
3.05
3.00
2.95
2.90
2.85
2.80 50 85
3.20
S-1172B50
−25 0 25
V
OUT
[V]
Ta [°C]
−40
5.10
5.20
75
5.00
4.90
4.80
4.70 50 85
5.30
6. Current consumption vs. Input voltage
S-1172B10 S-1172B30
0.5 2.5 4.5
I
SS1
[μA]
V
IN
[V]
0
100
120
80
60
40
1.5 3.5 5.5
20
01.0 3.0 5.0
2.0 4.0
−40 °C
Ta = 85 °C
25 °C
m
-
°
°
°
S-1172B50
m
-
°
°
°
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 21
7. Ripple rejection (Ta = +25°C)
S-1172B10 VIN = 2.0 V, COUT = 4. 7 μF
S-1172B30 VIN = 4.0 V, COUT = 4. 7 μF
100 1K 10K
Ripple Rejection [dB]
Frequency [Hz]
10 1M
0
100
80
60
40
20
100K
I
OUT
= 1 mA
30 mA
100 mA
100 1K 10K
Ripple Rejection [dB]
Frequency [Hz]
10 1M
0
100
80
60
40
20
100K
I
OUT
= 1 mA
30 mA
100 mA
S-1172B50 VIN = 5.5 V, COUT = 4.7 μF
100 1K 10K
Ripple Rejection [dB]
Frequency [Hz]
10 1M
0
100
80
60
40
20
100K
I
OUT
= 1 mA
30 mA
100 mA
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
22
Reference Data
1. Characteristics of input transient response (Ta = +25°C)
S-1172B10
IOUT = 100 mA, tr = tf = 5.0 μs, COUT = 4.7 μF, CIN = 4.7 μF S-1172B30
IOUT = 100 mA, tr = tf = 5.0 μs, COUT = 4.7 μF, CIN = 4.7 μF
0 200
V
OUT
[V]
t [μs]
−200 600 0
4
3
2
1
400 800 1000 1200
0.95
V
IN
[V]
V
IN
V
OUT
1.00
1.05
1.10
1.15
0
6
5
4
3
2
1
V
IN
[V]
0 200 t [μs]
−200 600
400 800 1000 1200
V
OUT
[V]
3.00
3.05
3.10
3.15
3.20
2.90
2.95
V
IN
V
OUT
S-1172B50
IOUT = 100 mA, tr = tf = 5.0 μs, COUT = 4.7 μF, CIN = 4.7 μF
0
7
6
5
4
3
2
4.90
4.95
V
IN
[V]
5.00
5.05
5.10
5.15
5.20
5.25
0 200 t [μs]
−200 600
400 800 1000 1200
V
OUT
[V]
1
V
IN
V
OUT
2. Characteristics of load transient response (Ta = +25°C)
S-1172B10
V
IN
= 2.0 V, C
OUT
= 4.7
μ
F, C
IN
= 4.7
μ
F, I
OUT
= 50 mA
↔
100 mA
V
IN
= 2.0 V, C
OUT
= 4.7
μ
F, C
IN
= 4.7
μ
F, I
OUT
= 100 mA
↔
500 mA
0
150
100
50
I
OUT
[mA]
−50
−100
0.90
0.95
1.00
1.05
1.10
1.15
1.20
V
OUT
[V]
0 200 t [μs]
−200 600
400 800 1000 1200
−150
I
OUT
V
OUT
0
600
400
200
I
OUT
[mA]
−200
−400
0.80
0.90
1.00
1.10
1.20
1.30
1.40
V
OUT
[V]
0 200 t [μs]
−200 600
400 800 1000 1200
−600
I
OUT
V
OUT
S-1172B30
V
IN
= 4.0 V, C
OUT
= 4.7
μ
F, C
IN
= 4.7
μ
F, I
OUT
= 50 mA
↔
100 mA
V
IN
= 4.0 V, C
OUT
= 4.7
μ
F, C
IN
= 4.7
μ
F, I
OUT
= 100 mA
↔
500 mA
0
150
100
50
I
OUT
[mA]
−50
−100
2.90
2.95
3.00
3.05
3.10
3.15
3.20
V
OUT
[V]
0 200 t [μs]
−200 600
400 800 1000 1200
−150
I
OUT
V
OUT
0
600
400
200
I
OUT
[mA]
−200
−400
2.80
2.90
3.00
3.10
3.20
3.30
3.40
V
OUT
[V]
0 200 t [μs]
−200 600
400 800 1000 1200
−600
I
OUT
V
OUT
2.70 −800
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 23
S-1172B50
V
IN
= 5.5 V, C
OUT
= 4.7
μ
F, C
IN
= 4.7
μ
F, I
OUT
= 50 mA
↔
100 mA
V
IN
= 5.5 V, C
OUT
= 4.7
μ
F, C
IN
= 4.7
μ
F, I
OUT
= 100 mA
↔
500 mA
0
150
100
50
I
OUT
[mA]
−50
−100
4.90
4.95
5.00
5.05
5.10
5.15
5.20
V
OUT
[V]
0 200 t [μs]
−200 600
400 800 1000 1200
−150
I
OUT
V
OUT
0
600
400
200
I
OUT
[mA]
−200
−400
4.50
4.70
4.90
5.10
5.30
5.50
5.70
V
OUT
[V]
0 200 t [μs]
−200 600
400 800 1000 1200
−600
I
OUT
V
OUT
3. Transient response characteristics of ON/OFF pin (Ta = +25°C)
S-1172B10
VIN = 2.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA
VON / OFF = 0 V → 2.0 V, tr = 1.0 μs
S-1172B30
VIN = 4.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA
VON / OFF = 0 V → 4.0 V, tr = 1.0 μs
V
OUT
[V]
2
0
3
V
OUT
1
4
5
−1
1
0
−1
−2
2
3
V
ON/OFF
[V]
−3
t [μs]
0 500−500 1000 1500 2000
V
ON/OFF
V
OUT
[V]
4
0
6
2
8
10
−2
2
0
−2
−4
4
6
V
ON/OFF
[V]
−6
t [μs]
0 500−500 1000 1500 2000
V
OUT
V
ON/OFF
S-1172B50
VIN = 5.5 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA
VON / OFF = 0 V → 5.5 V, tr = 1.0 μs
V
OUT
[V]
8
0
12
4
16
20
−4
3
0
−3
−6
6
9
V
ON/OFF
[V]
−9
t [μs]
0 500−500 1000 1500 2000
V
OUT
V
ON/OFF
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
24
4. Characteristics of inrush current (Ta = +25°C)
S-1172B10
VIN = 2.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA
VIN = 2.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 1000 mA
−4
−2
−6
0
2
1.2
1.0
0.8
I
OUT
[A]
0.6
t [μs]
050−50 100 150 200
0.2
0.4
0
V
ON/OFF
[V] / V
OUT
[V]
V
OUT
4
6
I
OUT
V
ON/OFF
−4
−2
−6
0
2
3.0
2.5
2.0
I
OUT
[A]
1.5
t [μs]
0 500−500 1000 1500 2000
0.5
1.0
0
V
ON/OFF
[V] / V
OUT
[V]
V
OUT
4
6
I
OUT
V
ON/OFF
S-1172B30
VIN = 4.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA
VIN = 4.0 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 1000 mA
−4
−2
−6
0
2
1.2
1.0
0.8
I
OUT
[A]
0.6
t [μs]
050−50 100 150 200
0.2
0.4
0
V
ON/OFF
[V] / V
OUT
[V]
V
OUT
4
6
I
OUT
V
ON/OFF
−4
−2
−6
0
2
3.0
2.5
2.0
I
OUT
[A]
1.5
t [μs]
0 500−500 1000 1500 2000
0.5
1.0
0
V
ON/OFF
[V] / V
OUT
[V]
V
OUT
4
6
I
OUT
V
ON/OFF
S-1172B50
VIN = 5.5 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 100 mA
VIN = 5.5 V, COUT = 4.7 μF, CIN = 4.7 μF, IOUT = 1000 mA
−4
−2
−6
0
2
1.2
1.0
0.8
I
OUT
[A]
0.6
t [μs]
050−50 100 150 200
0.2
0.4
0
V
ON/OFF
[V] / V
OUT
[V]
V
OUT
4
6
I
OUT
V
ON/OFF
−4
−2
−6
0
2
3.0
2.5
2.0
I
OUT
[A]
1.5
t [μs]
0 500−500 1000 1500 2000
0.5
1.0
0
V
ON/OFF
[V] / V
OUT
[V]
V
OUT
4
6
I
OUT
V
ON/OFF
5. Example of equivalent series resistance vs. Output current characteristics (Ta = +25°C)
100
0.1 1000
IOUT [mA]
RESR [Ω]
CIN = CL = 4.7
μ
F
0
Stable
CIN
VIN
VSS
CL*1
RESR
S-1172 Series VOUT
ON/OFF
*1. CL: TAIYO YUDEN Co. , Ltd. LMK316BJ 475ML (4.7 μF)
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.2_00 S-1172 Series
Seiko Instruments Inc. 25
Marking Specifications
1. SOT-89-5
(1) to (3): Prod uct ab breviat i on (ref er t o Product name vs. Product code)
(4) to (6): Lot num ber
(1) (2) (3)
(4) (5) (6)
123
45
Top view
Product name vs. Product code
Product Code Product Code
Product Name (1) (2) (3) Product Name (1) (2) (3)
S-1172B10-U5T1x S O A S-1172B29-U5T1x S O V
S-1172B11-U5T1x S O B S-1172B30-U5T1x S O W
S-1172B12-U5T1x S O C S-1172B31-U5T1x S O X
S-1172B1C-U5T1x S P S S-1172B32-U5T1x S O Y
S-1172B13-U5T1x S O D S-1172B33-U5T1x S O Z
S-1172B14-U5T1x S O E S-1172B34-U5T1x S P A
S-1172B15-U5T1x S O F S-1172B35-U5T1x S P B
S-1172B16-U5T1x S O G S-1172B36-U5 T1x S P C
S-1172B17-U5T1x S O H S-1172B37-U5T1x S P D
S-1172B18-U5T1x S O I S-1172B38-U5T1x S P E
S-1172B1J-U5T1x S O J S-1172B39-U5 T1x S P F
S-1172B19-U5T1x S O K S-1172B40-U5T1x S P G
S-1172B20-U5T1x S O L S-1172B41-U5T 1x S P H
S-1172B21-U5T1x S O M S-1172B42-U5T1x S P I
S-1172B22-U5T1x S O N S-1172B43-U5T1x S P J
S-1172B23-U5T1x S O O S-1172B44-U5 T1x S P K
S-1172B24-U5T1x S O P S-1172B45-U5T1x S P L
S-1172B25-U5T1x S O Q S-1172B46-U5 T1x S P M
S-1172B26-U5T1x S O R S-1172B47-U5T1x S P N
S-1172B27-U5T1x S O S S-1172B48-U5T1x S P O
S-1172B28-U5T1x S O T S-1172B49- U5T1x S P P
S-1172B2J-U5T1x S O U S-1172B50-U5T1x S P Q
Remark 1. x: G or U
2. Please se lect product s of e nv ironm ent al co de = U f or Sn 100%, ha loge n -f ree pr odu ct s.
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series Rev.2.2_00
Seiko Instruments Inc.
26
2. HSOP-6
(1) to (5): Product name : S1172 (Fixed)
(6): Product type
(7) and (8): Value of output voltage
(9): Blank
(10) to (16): Lot number
(1) (2) (3) (4)
(7) (8) (9)
(10)
(
13
) (
14
)
(5) (6)
(11) (12)
(15)
(
16
)
Top view
654
123
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
1.5±0.1 1.5±0.1
1.6±0.2
4.5±0.1
132
1.5±0.1
0.4±0.05
0.4±0.1
0.45±0.1
0.4±0.1
45°
0.3
54
No. UP005-A-P-SD-1.1
UP005-A-P-SD-1.1
SOT895-A-PKG Dimensions
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
2.0±0.1
0.3±0.05
8.0±0.1
ø1.5+0.1
-0
2.0±0.05
ø1.5+0.1
-0
4.75±0.1
5° max.
1
32
54
No. UP005-A-C-SD-1.1
UP005-A-C-SD-1.1
SOT895-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches : 40.0±0.2)
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
16.5max.
13.0±0.3
QTY. 1,000
(60°)
(60°)
No. UP005-A-R-SD-1.1
UP005-A-R-SD-1.1
SOT895-A-Reel
Enlarged drawing in the central part
No. FH006-A-P-SD-2.0
No.
TITLE
SCALE
UNIT mm
HSOP6-A-PKG Dimensions
Seiko Instruments Inc.
FH006-A-P-SD-2.0
0.4±0.05
1.91
5.02±0.2
13
64
1.91
1.67±0.05
5
20.20±0.05
No.
TITLE
SCALE
UNIT mm
4
6
1
3
ø2.0±0.05
ø1.55±0.05 0.3±0.05
2.1±0.1
8.0±0.1
5°max.
6.7±0.1
2.0±0.05
Seiko Instruments Inc.
Feed direction
4.0±0.1(10 pitches:40.0±0.2)
HSOP6-A-Carrier Tape
FH006-A-C-SD-1.0
No. FH006-A-C-SD-1.0
No.
TITLE
SCALE
UNIT mm
QTY. 2,000
2±0.5
13.5±0.5
60°
2±0.5
ø13±0.2
ø21±0.8
Seiko Instruments Inc.
Enlarged drawing in the central part
HSOP6-A-Reel
No. FH006-A-R-SD-1.0
FH006-A-R-SD-1.0
No.
TITLE
SCALE
UNIT mm
QTY. 4,000
2±0.5
13.5±0.5
60°
2±0.5
ø13±0.2
ø21±0.8
Seiko Instruments Inc.
Enlarged drawing in the central part
HSOP6-A-Reel
No. FH006-A-R-S1-1.0
FH006-A-R-S1-1.0
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
HSOP6-A-Land Recommendation
No. FH006-A-L-SD-2.0
FH006-A-L-SD-2.0
0.76
1.91 1.91
2.03
www.sii-ic.com
• The information described herein is subject to change without notice.
• Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein
whose related industrial properties, patents, or other rights belong to third parties. The application circuit
examples explain typical applications of the products, and do not guarantee the success of any specific
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• When the products described herein are regulated products subject to the Wassenaar Arrangement or other
agreements, they may not be exported without authorization from the approp riate governmental authority.
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• The products described herein are not designed to be radiation-proof.
• Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the
failure or malfunction of semiconductor products may occur. The user of these products should therefore
give thorough consideration to safety design, including redundancy, fire-prevention measures, and
malfunction prevention, to prevent any accidents, fires, or comm unity damage that may ensue.
