S-1702 Series
www.sii-ic.com
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH
BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
© Seiko Instruments Inc., 2008-2012 Rev.2.1_00
Seiko Instruments Inc. 1
The S-1702 Series, developed based on CMOS technology, is a 150 mA output positive voltage regulator with a low
dropout voltage, a high-accuracy output voltage, and low current consumption.
The S-1702 Series includes a voltage regulator with high-accuracy output voltage of ±1.0% allowing to use a ceramic
capacitor of 1.0 μF or more, and a voltage detector that monitors the output/input voltage of the regulator. It also includes
an overcurrent protector that prevents the output current from exceeding the current capacitance of the output transistor
and an output forcible discharge circuit for the regulator operation off.
Small SNT-6A package is available for the S-1702 Series. And an external small capacitor can be used, enabling
high-density mounting. Its super-low current consumption makes the S-1702 Series ideal for mobile devices.
Features
Regulator block
• Output voltage: 1.5 V to 5.5 V, selectable in 0.05 V step
• High-accuracy output voltage: ±1.0%
• Super-low current consumption: Current consumption of regulator block: 9 μA typ., 16 μA max.
• High peak current capability: 150 mA output (VIN ≥ VOUT(S) + 1.0 V)*1
• Built-in on/off discharge circuit: Longer battery life, discharges output load instantaneously
• High ripple rejection: 70 dB typ. (1.0 kHz)
• Built-in overcurrent protector: Limits overcurrent of output transistor
Detector block
• Output voltage: 1.3 V to 5.2 V, selectable in 0.05 V step
• Built-in high-accuracy voltage detector: ±1.0%
Monitoring output/input or monitoring external input by option
(detector output)
• External reset input: Forcible assertion of detector output by external reset pin (RESX) input
Overall
• Correlation temperature gradient in the regulator and the detector blocks
• Super-low current consumption: During operation*2: 10 μA typ., 18 μA max.
• Operation temperature range: Ta = −40°C to +85°C
• Lead-free, Sn 100%, halogen-free*3
*1. Attention should be paid to the power dissipation of the package when the output current is large.
*2. Excluding current flowing in pull-up and pull-down resistors connected to the ON / OFF or RESX pins
*3. Refer to “ Product Name Structure” for details.
Applications
• Wireless power supply circuit block for cellular phone
• Power supply circuit block for health care product
• Power supply circuit block for various mobile devices
Package
• SNT-6A
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
2
Block Diagrams
1. S-1702 Series A type to H type
Discharge Shunt Function
by ON / OFF and RESX
Pins
Product
Type
Detector
Monitor
Voltage Control by
ON / OFF Pin
Control by
RESX Pin
A VOUT { {
B VOUT { ×
C VOUT × {
D VOUT × ×
E VIN { {
F VIN { ×
G VIN × {
H VIN × ×
Overcurrent
protector
ON/OFF circuit
Reference
voltage circuit
Reference
voltage
circuit
ON / OFF
VIN
RESX
VOUT
VSS
VDOUT
Reset circuit
Delay
circuit
Voltage
detector Output
circuit
Logic
circuit
Figure 1
2. S-1702 Series J type and K type (external input detection type)
Product
Type
Detector
Monitor
Voltage
Discharge Shunt Function
by ON / OFF Pin
J
External
input
{
K
External
input
×
Overcurrent
protector
ON/OFF circuit
Reference
voltage
circuit
ON / OFF
VIN
SENSE
VOUT
VSS
VDOUT
Delay
circuit
Voltage
detector
Reset circuit
Logic
circuit
Reference
voltage circuit
Output
circuit
Figure 2
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 3
3. S-1702 Series L type to N type, P type (external delay type)
Product
Type
Detector
Monitor
Voltage
Discharge Shunt Function
by ON / OFF Pin
L VOUT {
M VOUT ×
N VIN {
P VIN ×
Overcurrent
protector
ON/OFF circuit
Reference
voltage
circuit
ON / OFF
VIN
CD
VOUT
VSS
VDOUT
Delay
circuit
Voltage
detector
Reset circuit
Logic
circuit
Reference
voltage circuit
Output
circuit
Figure 3
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
4
Product Name Structure
1. Product name
S-1702 x x x xx - I6T1 x
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
Package abbreviation and IC packing specifications*1
I6T1: SNT-6A, tape product
Output voltage value of regulator and detection voltage value of detector*2
00 and 01 (two-digit numeric option code)
Input type of RESX and ON / OFF pins*3
A to H, J (one-digit alphabetical option code)
Output type of VDOUT pin*4
A to H, J (one-digit alphabetical option code)
Product type*5
A to H, J to N, P (one-digit alphabetical option code)
*1. Refer to the tape drawing.
*2. Refer to Table 4 of “2. Function list according to product type”.
*3. Refer to Table 3 of “2. Function list according to product type”.
*4. Refer to Table 2 of “2. Function list according to product type”.
*5. Refer to Table 1 of “2. Function list according to product type”.
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 5
2. Function list according to product type
Table 1 Product Types
Discharge Shunt Function
Option
Code
ON / OFF Pin
Application
RESX Pin
Application Delay Type Detector Monitor
Voltage Control by
ON / OFF Pin
Control by
RESX Pin
A ON / OFF RESX Internal VOUT { {
B ON / OFF RESX Internal VOUT { ×
C ON / OFF RESX Internal VOUT × {
D ON / OFF RESX Internal VOUT × ×
E ON / OFF RESX Internal VIN { {
F ON / OFF RESX Internal VIN { ×
G ON / OFF RESX Internal VIN × {
H ON / OFF RESX Internal VIN × ×
J ON / OFF SENSE Internal VSENSE { –
K ON / OFF SENSE Internal VSENSE × –
L ON / OFF CD External VOUT { –
M ON / OFF CD External VOUT × –
N ON / OFF CD External VIN { –
P ON / OFF CD External VIN × –
Table 2 Output Types of VDOUT Pin
Option
Code
Output Type Hysteresis
A Nch open drain output 5.0%
B CMOS output (VOUT drive) 5.0%
C CMOS output (VIN drive) 5.0%
D Nch open drain output 2.5%
E CMOS output (VOUT drive) 2.5%
F CMOS output (VIN drive) 2.5%
G Nch open drain output None
H CMOS output (VOUT drive) None
J CMOS output (VIN drive) None
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
6
Table 3 Input Types of RESX and ON / OFF Pins
Option
Code
RESX Pin ON / OFF Pin
A No pull-up/pull-down resistor No pull-up/pull-down resistor
B No pull-up/pull-down resistor Pull-up
C No pull-up/pull-down resistor Pull-down
D Pull-up No pull-up/pull-down resistor
E Pull-up Pull-up
F Pull-up Pull-down
G Pull-down No pull-up/pull-down resistor
H Pull-down Pull-up
J Pull-down Pull-down
Table 4 Output Voltage Values of Regulator and Detection Voltage Values of Detector
Option
Code
Output Voltage Detection Voltage
00 3.1 V ±1.0% 2.75 V ±1.0%
01 3.1 V ±1.0% 2.60 V ±1.0%
Remark Please contact our sales office for products with an output voltage or detection
voltage other than those specified above.
3. Package
Drawing Code
Package Name Package Tape Reel Land
SNT-6A PG006-A-P-SD PG006-A-C-SD PG006-A-R-SD PG006-A-L-SD
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 7
Pin Configuration
1. SNT-6A
Table 5
Pin No. Symbol Description
1 VIN Input voltage pin
2 ON / OFF Power-off pin
RESX External reset pin
(S-1702Axx to Hxx)
CD External delay capacitor connection pin
(S-1702Lxx to Nxx, Pxx)
3
SENSE Detector SENSE pin
(S-1702Jxx, Kxx)
4 VSS GND pin
5 VDOUT Detector output voltage pin
6 VOUT Regulator output voltage pin
5
4
6
2
3
1
Top view
Figure 4
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
8
Absolute Maximum Ratings
Table 6
(Ta = +25°C unless otherwise specified)
Item Symbol Absolute Maximum Rating Unit
VIN V
SS − 0.3 to VSS + 7.0 V
VON / OFF V
SS − 0.3 to VIN + 0.3 V
VRESX V
SS − 0.3 to VIN + 0.3 V
VCD V
SS − 0.3 to VIN + 0.3 V
Input voltage
VSENSE V
SS − 0.3 to VSS + 7.0 V
Regulator output voltage VOUT V
SS − 0.3 to VIN + 0.3 V
Nch open drain output VSS − 0.3 to VSS + 7.0 V Detector output
voltage CMOS output VDOUT VSS − 0.3 to VIN + 0.3 V
Power dissipation PD 400*1 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) 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.
Ambient temperature (Ta) [°C]
0
50
100
150
300
100
0
500
200
400
Power dissipation [P
D
] (mW)
Figure 5 Power Dissipation of Package
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 9
Electrical Characteristics
1. Common to series (S-1702Axx to Hxx, Jxx to Nxx, Pxx)
Table 7 (1 / 2)
Entire circuit (Ta = +25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
Current
consumption
during operation*1
ISS V
IN = VOUT(S) + 1.0 V – 10 18 μA 2
Regulator block
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
Output voltage*2 VOUT(E) V
IN = VOUT(S) + 1.0 V, IOUT = 30 mA VOUT(S)
×0.99 VOUT(S) VOUT(S)
×1.01 V 1
Output current*3 IOUT V
IN > VOUT(S) + 1.0 V 150*8 – – mA 3
1.5 V < VOUT(S) ≤ 2.0 V – 0.54 0.58 V 1
2.0 V < VOUT(S) ≤ 2.5 V – 0.23 0.35 V 1
2.5 V < VOUT(S) ≤ 3.0 V – 0.2 0.3 V 1
3.0 V < VOUT(S) ≤ 3.3 V – 0.15 0.23 V 1
Dropout voltage*4 Vdrop I
OUT = 100 mA
3.3 V < VOUT(S) ≤ 5.5 V – 0.14 0.21 V 1
Line regulation
Δ
VIN
•
VOUT
Δ
VOUT1
VOUT(S) + 0.5 V < VIN < 6.5 V,
IOUT = 30 mA – 0.05 0.2 %/V 1
Load regulation ΔVOUT2 VIN = VOUT(S) + 1.0 V,
10 μA < IOUT < 100 mA – 20 40 mV 1
Output voltage
temperature
coefficient *5
Δ
Ta • V
OUT
Δ
V
OUT
VIN = VOUT(S) + 1.0 V,
IOUT = 30 mA,
−40°C ≤ Ta ≤ +85°C*9
– ±100 ±300 ppm/
°C 1
Current
consumption
during operation*1
ISS1
VIN = VOUT(S) + 1.0 V,
RESX and ON / OFF pins enabled for
operation, no load
– 9 16 μA 2
Input voltage VIN – 2 – 6.5 V –
ON / OFF pin
input voltage “H” VSH1 V
IN = VOUT(S) + 1.0 V, RL = 1.0 kΩ 1.2 – – V 4
ON / OFF pin
input voltage “L” VSL1 V
IN = VOUT(S) + 1.0 V, RL = 1.0 kΩ – – 0.3 V 4
S-1702xxA −0.1 – 0.1 μA 4
S-1702xxD −0.1 – 0.1 μA 4
ON / OFF pin
input current “H” ISH1 V
IN = 6.5 V, VON / OFF = 6.5 V
S-1702xxG −0.1 – 0.1 μA 4
S-1702xxA −0.1 – 0.1 μA 4
S-1702xxD −0.1 – 0.1 μA 4
ON / OFF pin
input current “L” ISL1 V
IN = 6.5 V, VON / OFF = 0 V
S-1702xxG −0.1 – 0.1 μA 4
1.5 V ≤ VOUT(S) < 3.1 V – 70 – dB 5
Ripple rejection RR
VIN = VOUT(S) + 1.0 V,
f = 1.0 kHz,
ΔVrip = 0.5 Vrms,
IOUT = 30 mA 3.1 V ≤ VOUT(S) ≤ 5.5 V – 65 – dB 5
Short-circuit
current ISHORT
VIN = VOUT(S) + 1.0 V,
ON / OFF pin enabled for operation,
VOUT = 0 V
– 300 – mA 5
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
10
Table 7 (2 / 2)
Detector block (Ta = +25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
Detection voltage*6 −VDET –
−VDET(S)
×0.99 −VDET(S) −VDET(S)
×1.01 V 6
S-1702xAx, S-1702xBx, S-1702xCx −VDET
×0.035
−VDET
×0.05
−VDET
×0.065 V 6
S-1702xDx, S-1702xEx, S-1702xFx −VDET
×0.01
−VDET
×0.025
−VDET
×0.04 V 6
Hysteresis width VHYS
S-1702xGx, S-1702xHx, S-1702xJx – 0 −VDET
×0.015 V 6
VIN = −VDET(S) + 1.5 V – 2.4 4.0 μA 2
1.3 V ≤ −VDET(S) < 2.3 V VIN = 5.5 V – 2.6 4.5 μA 2
VIN = −VDET(S) + 1.5 V – 2.2 3.5 μA 2
Current consumption
during operation*1 ISS2
2.3 V ≤ −VDET(S) < 5.2 V VIN = 5.5 V – 2.3 4.0 μA 2
Input voltage VIN – 0.8 – 6.5 V –
Detection voltage
temperature
coefficient *7
Δ
Ta
•
−V
DET
Δ
−V
DET
Ta = −40°C to +85°C*9 – ±100 ±400 ppm/
°C 6
*1. Excluding current flowing in pull-up and pull-down resistors connected to the ON / OFF or RESX pins
*2. VOUT(S): Set output voltage
VOUT(E): Actual output voltage at the fixed load
The output voltage when fixing IOUT (= 30 mA) and inputting VOUT(S) + 1.0 V
*3. The output current at which the output voltage becomes 95% of VOUT(E) after gradually increasing the output current.
*4. Vdrop = VIN1 − (VOUT3 × 0.98)
VOUT3 is the output voltage when VIN = VOUT(S) + 1.0 V and IOUT = 100 mA.
VIN1 is the input voltage at which the output voltage becomes 98% of VOUT3 after gradually decreasing the input
voltage.
*5. The change in temperature [mV/°C] of the regulator output voltage is calculated using the following equation.
Δ
Ta • V
OUT
Δ
V
OUT
[mV/°C]
*1
= V
OUT(S)
[V]
*2
×
Δ
V
OUT
[ppm/°C]
*3
÷ 1000
Δ
Ta
*1. The change in temperature of the output voltage
*2. Set output voltage
*3. Output voltage temperature coefficient
*6. −VDET(S) : Set detection voltage
−VDET : Actual detection voltage
*7. The change in temperature [mV/°C] of the detector detection voltage is calculated using the following equation.
Δ
Ta • −V
DET
Δ
−V
DET
[mV/°C]
*1
= −V
DET(S)
(Typ.) [V]
*2
×
Δ
−V
DET
[ppm/°C]
*3
÷ 1000
Δ
Ta
*1. The change in temperature of the detection voltage
*2. Set detection voltage
*3. Detection voltage temperature coefficient
*8. The output current can be at least this value.
Due to restrictions on the package power dissipation, this value may not be satisfied. Attention should be paid to the
power dissipation of the package when the output current is large. This specification is guaranteed by design.
*9. Since products are not screened at high and low temperatures, the specification for this temperature range is
guaranteed by design, not tested in production.
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 11
2. Discharge shunt circuit (discharge shunt function) (S-1702Axx, Bxx, Cxx, Exx, Fxx, Gxx, Jxx, Lxx, Nxx)
Table 8
(Ta = +25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
“L” output, Nch on resistor RLOW V
DS = 0.5 V, VGS = 6.5 V – 100 – Ω 3
3. Detector output circuit (VDOUT pin)
Table 9
Nch open drain output (S-1702xAx, xDx, xGx) (Ta = +25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
Output current IDOUT1 Output transistor: Nch,
VDS = 0.5 V, VDD = 1.2 V 1.36 2.55 – mA 7
Leakage current ILEAK Output transistor: Nch,
VDS = 5.5 V, VDD = 5.5 V – – 100 nA 7
CMOS output (S-1702xBx, xCx, xEx, xFx, xHx, xJx)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
IDOUT2 Output transistor: Nch,
VDS = 0.5 V, VIN = 1.2 V 1.36 2.55 – mA 7
Output current
IDOUT3 Output transistor: Pch,
VDS = 0.5 V, VIN = 5.5 V 1.71 2.76 – mA 8
4. RESX pin (S-1702Axx, Bxx, Cxx, Dxx, Exx, Fxx, Gxx, Hxx)
Table 10
(Ta = +25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
RESX pin input voltage “H”*1 VSH2 V
IN = VOUT(S) + 1.0 V, RL = 1.0 kΩ 1.2 – – V 4
RESX pin input voltage “L” VSL2 V
IN = VOUT(S) + 1.0 V, RL = 1.0 kΩ – – 0.3 V 4
S-1702xxA −0.1 – 0.1 μA 4
S-1702xxB −0.1 – 0.1 μA 4
RESX pin input current “H” ISH2 V
IN = 6.5 V, VRESX = 6.5 V
S-1702xxC −0.1 – 0.1 μA 4
S-1702xxA −0.1 – 0.1 μA 4
S-1702xxB −0.1 – 0.1 μA 4
RESX pin input current “L” ISL2 V
IN = 6.5 V, VRESX = 0 V
S-1702xxC −0.1 – 0.1 μA 4
*1. VOUT(S): specified output voltage value
5. Pull-up / pull-down resistor value of ON / OFF pin and RESX pin (S-1702
xx
B,
xx
C,
xx
D,
xx
E,
xx
F
xx
G,
xx
H,
xx
J)
Table 11
(Ta = +25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
Pull-up / pull-down resistor RPULL – – 2.0 – MΩ 4
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
12
6. Response time
Table 12
Internal delay type (S-1702Axx, Bxx, Cxx, Dxx, Exx, Fxx, Gxx, Hxx, Jxx, Kxx) (Ta = +25°C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
Response time TPLH1 – – – 90 μs 6
External delay type (S-1702Lxx, Mxx, Nxx, Pxx)
Item Symbol Condition Min. Typ. Max. Unit
Test
Circuit
Response time TPLH2 C
D = 4.7 nF – 30 – ms 9
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 13
Test Circuits
1.
VIN
VOUT
VDOUT
VSS
RESX V
+
A
+
Set to
power on
ON / OFF
A
+
The portion enclosed by dotted lines is not required
for CMOS output products.
2.
VIN
VOUT
VDOUT
VSS
RESX
Set to V
IN
or
GND
ON / OFF
A
+
The portion enclosed by dotted lines is not required
for CMOS out
p
ut
p
roducts.
Figure 6 Figure 7
3.
VIN
VOUT
VDOUT
VSS
RESX V
+
Set to V
IN
or
GND
ON / OFF
A
+
The portion enclosed by dotted lines is not required
for CMOS output products.
A
+
4.
VIN
VOUT
VDOUT
VSS
RESX
V
+
ON / OFF
The portion enclosed by dotted lines is not required
for CMOS output products.
A
+
A
+
R
L
Figure 8 Figure 9
5.
VIN
VOUT
VDOUT
VSS
RESX V
+
ON / OFF
The portion enclosed by dotted lines is not required
for CMOS output products.
R
L
Set to
power on
6.
VIN
VOUT
VDOUT
VSS
RESX
(SENSE)
ON / OFF
The portion enclosed by dotted lines is not required
for CMOS output products.
V
+
Figure 10 Figure 11
7.
VIN
VOUT
VDOUT
VSS
RESX
+
ON / OFF
+
V
AV
DS
8.
VIN
VOUT
VDOUT
VSS
RESX
+
ON / OFF
+
V
A
V
DS
Figure 12 Figure 13
9.
VIN
VOUT
VDOUT
VSS
RESX
(CD)
ON / OFF
The portion enclosed by dotted lines is not required
for CMOS output products.
V
+
Figure 14
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
14
Standard Circuits
1. S-1702Axx, Bxx, Cxx, Dxx, Exx, Fxx, Gxx, Hxx
VIN
VOUT
VDOUT
VSS
RESX
ON / OFF
VR output
VD output
GND
Single GND
Input
C
L*2
C
IN*1
R
*3
*1. C
IN is a capacitor for stabilizing the input.
*2. A ceramic capacitor of 1.0 μF or more can be used for CL.
*3. R is not required for a CMOS output product.
Figure 15
2. S-1702Jxx, Kxx
VIN
VOUT
VDOUT
VSS
RESX
(SENSE)
ON / OFF
VR output
VD output
GND
Single GND
Input
C
L*2
C
IN*1
R
*3
*1. C
IN is a capacitor for stabilizing the input.
*2. A ceramic capacitor of 1.0 μF or more can be used for CL.
*3. R is not required for a CMOS output product.
Figure 16
3. S-1702Lxx, Mxx, Nxx, Pxx
VIN
VOUT
VDOUT
VSS
RESX
(CD)
ON / OFF
VR output
VD output
GND
Single GND
Input
C
L*2
C
IN*1
R
*3
*1. C
IN is a capacitor for stabilizing the input.
*2. A ceramic capacitor of 1.0 μF or more can be used for CL.
*3. R is not required for a CMOS output product.
Figure 17
Caution The above connection diagrams and constants will not guarantee successful operation. Perform
thorough evaluation using the actual application to set the constants.
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 15
Application Conditions
Input capacitor (CIN): 1.0 μF or more
Output capacitor (CL): 1.0 μF or more
ESR of output capacitor: 10 Ω or less
Caution 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 VIN Input and VOUT Output Capacitors (CIN, CL)
The S-1702 Series requires an output capacitor (CL) between the VOUT and VSS pins for phase compensation. A
ceramic capacitor with a capacitance of 1.0 μF or more provides a stable operation in all temperature ranges. When
using an OS capacitor, tantalum capacitor, or aluminum electrolytic capacitor, a capacitor with a capacitance of 1.0 μF
or more and an ESR of 10 Ω or less is required.
The output overshoot and undershoot values, which are transient response characteristics, vary depending on the
output capacitor value. The required capacitance value for the input capacitor differs depending on the application.
The recommended application values are CIN = 1.0 μF or more and CL = 1.0 μF or more; however, perform thorough
evaluation using the actual device, including evaluation of temperature characteristics.
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Explanation of Terms
1. Regulator block
1. 1 Low dropout voltage regulator
This voltage regulator has the low dropout voltage due to its built-in transistor with low on-resistance.
1. 2 Low ESR
A capacitor whose ESR (Equivalent Series Resistance) is low. The S-1702 Series enables use of a low ESR
capacitor, such as a ceramic capacitor, for the output-side capacitor (CL). A capacitor whose ESR is 10 Ω or less
can be used.
1. 3 Output voltage (VOUT)
The accuracy of the output voltage is ensured at ±1.0% under the specified conditions of fixed input voltage*1, fixed
output current, and fixed temperature.
*1. Differs depending on the product.
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.
1. 4 Line regulation ⎟
⎠
⎞
⎜
⎝
⎛
•Δ
Δ
OUTIN
1OUT
VV
V
Indicates the dependency of the output voltage on the input voltage. That is, the values show how much the output
voltage changes due to a change in the input voltage with the output current remaining unchanged.
1. 5 Load regulation (ΔVOUT2)
Indicates the dependency of the output voltage on the output current. That is, the values show how much the
output voltage changes due to a change in the output current with the input voltage remaining unchanged.
1. 6 Dropout voltage (Vdrop)
Indicates the difference between the input voltage VIN1, which is the input voltage (VIN) at the point where the
output voltage has fallen to 98% of the output voltage value VOUT3 after VIN was gradually decreased from VIN =
VOUT(S) + 1.0 V, and the output voltage at that point (VOUT3 × 0.98).
Vdrop = VIN1 − (VOUT3 × 0.98)
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1. 7 Output voltage temperature coefficient ⎟
⎠
⎞
⎜
⎝
⎛
•Δ
Δ
OUT
OUT
VTa
V
The shaded area in Figure 18 is the range where VOUT varies in the operating temperature range when the output
voltage temperature coefficient is ±100 ppm/°C.
(Refer to *5 of Table 7 for how to calculate the temperature change [mV/°C] of the output voltage.)
*1. V
OUT(E)
is the value of the output voltage measured at 25°C.
V
OUT(E)*1
−40 25
+0.30 mV/°C
V
OUT
[V]
85 Ta [ °C]
−0.30 mV/°C
Figure 18 Example of Output Voltage Temperature Characteristics (When VOUT = 3.0 V Typ.)
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2. Detector block
2. 1 Detection voltage (−VDET)
The detection voltage (−VDET) is a voltage when the detector output voltage (VDOUT) switches to low. This
detection voltage varies slightly depending on products even having the same specification. The range between
the minimum (−VDET) value and the maximum (−VDET) value due to variation is called the range of detection
voltage (refer to Figure 19).
e.g. In a product with −VDET = 3.0 V, the detection voltage is a value in the range of 2.97 V ≤ (−VDET) ≤ 3.03 V.
This means that some products have 2.97 V for −VDET and some have 3.03 V.
Detection voltage
Range of detection voltage
V
OUT
(−V
DET
) min.
(−V
DET
) max.
V
DOUT
Remark This is the case when the regulator output voltage (V
OUT
) is monitored by the detector.
Figure 19 Detection Voltage (−VDET)
2. 2 Release voltage (+VDET)
The release voltage (+VDET) is a voltage when the detector output voltage (VDOUT) switches to high. This release
voltage varies slightly depending on products even having the same specification. The range between the
minimum (+VDET) value and the maximum (+VDET) value due to variation is called the range of release voltage
(refer to Figure 20).
e.g. In a product with −VDET = 3.0 V and hysteresis width of 5%, the release voltage is a value in the range of
3.074 V ≤ (+VDET) ≤ 3.227 V.
This means that some products have 3.074 V for +VDET and some have 3.227 V.
Range of release voltage
V
OUT
Delay time
Release voltage
(+V
DET
) min.
(+V
DET
) max.
V
DOUT
Remark This is the case when the regulator output voltage (V
OUT
) is monitored by the detector.
Figure 20 Release Voltage (+VDET)
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2. 3 Hysteresis width (VHYS)
The hysteresis width is the difference between the detection voltage and the release voltage. Setting the
hysteresis width prevents malfunction caused by noise on the input voltage. The hysteresis width is internally
fixed and varies depending on the product type (refer to Table 2).
2. 4 Delay time (tD)
The delay time (tD) is a period from the input voltage flowing to the detector block has exceeded the release
voltage (+VDET), until the detector output voltage (VDOUT) inverts.
The internal delay type products (S-1702Axx, Bxx, Cxx, Dxx, Exx, Fxx, Gxx, Hxx, Jxx, Kxx) have delay time which
is internally fixed.
In external delay type products (S-1702Lxx, Mxx, Nxx, Pxx), the delay time (tD) can be changed by controlling the
capacitance value of the capacitor (CD) connected between the CD (RESX) and VSS pins.
For how to set the delay time (tD), refer to “3. 2 Delay circuit” in “3. Detector block” in “ Operation”.
tD
VOUT
VDOUT
When tD = 90 μs
V
+VDET
tD
When tD = 30 ms
t
Remark This is the case when the regulator output voltage (VOUT) is monitored by the detector.
Figure 21
2. 5 Through-type current
This is the current that flows instantaneously when the voltage detector detects and releases a voltage.
A large through-type current flows in CMOS output products (S-1702xBx, xCx, xEx, xFx, xHx, xJx).
A small through-type current flows in Nch open drain products (S-1702xAx, xDx, xGx).
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2. 6 Oscillation
In applications where a resistor is connected to the input side (Figure 22), the through-type current which is
generated when the detector output voltage (VDOUT) goes from low to high (release) causes a voltage drop equal
to Through-type current × Input resistance across the resistor. When the input voltage drops below the detection
voltage as a result, the detector output voltage (VDOUT) goes from high to low. In this state, the through-type
current stops, its resultant voltage drop disappears, and the detector output voltage (VDOUT) goes from low to high.
The through-type current is then generated again, a voltage drop appears, and repeating the process finally
induces oscillation.
VDOUT
VSS
VIN
R
b
R
a
V
IN
S-1702
VD
block
Figure 22 Example of Bad Implementation of Detection Voltage Changer
2. 7 Temperature characteristics of detection voltage
The shaded area in Figure 23 is the range where −VDET varies within the operating temperature range when the
temperature coefficient of the detection voltage is ±100 ppm/°C. (Refer to *7 of Table 7 for how to calculate the
temperature change [mV/°C] of the detection voltage.)
3.000
−40 25
+0.30 mV/°C
−V
DET
[V]
85 Ta [°C]
−0.30 mV/°C
Figure 23 Example of Detection Voltage Temperature Characteristics (When −VDET = 3.0 V Typ.)
2. 8 Temperature characteristics of release voltage
The temperature change Ta
VDET
Δ
+Δ of the release voltage is calculated by the temperature change Ta
VDET
Δ
−Δ
of the detection voltage as follows:
Ta
V
V
V
Ta
VDET
DET
DETDET
Δ
−Δ
×
−
+
=
Δ
+Δ
The temperature changes of the release voltage and the detection voltage consequently have the same sign.
2. 9 Temperature characteristics of hysteresis voltage
The temperature change of the hysteresis voltage is expressed as
Ta
V
Ta
VDETDET
Δ
−
Δ
−
Δ
+
Δ
and is calculated as follows:
Ta
V
V
V
Ta
V
Ta
VDET
DET
HYSDETDET
Δ
−Δ
×
−
=
Δ
−Δ
−
Δ
+Δ
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Operation
1. Control of S-1702 Series by using ON / OFF and RESX pins
1. 1 Starting and stopping regulator block
The regulator block can be started and stopped according to the combination of the ON / OFF and RESX pins.
The regulator block switches off the output transistor between the VIN and VOUT pins and reduces current
consumption significantly.
The detector block is operating during this period, so only the amount of current consumed by the detector block
flows in the S-1702 Series.
1. 2 Regulator output (VOUT) control: discharge shunt function *1
The regulator output (VOUT) can be controlled by combining the ON / OFF and RESX pins.
In the product types having a discharge shunt circuit*1 (Axx, Bxx, Cxx, Exx, Fxx, Gxx, Jxx, Lxx, Nxx), this circuit
forcibly sets the regulator output (VOUT) the VSS level*1.
In the product types that do not have a discharge shunt circuit*1 (Dxx, Hxx, Kxx, Mxx, Pxx), the regulator output
(VOUT) is set at the VSS level by a division resistor of several MΩ between the VOUT and VSS pins.
*1. For details of a discharge shunt circuit, refer to “2. 2. 2 Discharge shunt function” in “2. Regulator
Block”.
1. 3 Detector output voltage (VDOUT) control: forcible assertion function
The detector output voltage (VDOUT) is forcibly asserted to the VSS level by combining the ON / OFF and RESX
pins.
When the forcible assertion function is not being used, the result of detection by the detector (release status: “H”,
detection status: “L”) is output from the VDOUT pin.
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1. 4 Operation of each function according to ON / OFF and RESX pins
The following shows the operation of each function according to the combination of the ON / OFF and RESX pin.
Table 13
S-1702Axx, Exx
ON / OFF Pin RESX Pin Regulator Block
Regulator Output
(VOUT)
Detector Output
(VDOUT)
“L” “L” Stops Forcibly discharged VSS potential
“L” “H” Stops Forcibly discharged VSS potential
“H” “L” Stops Forcibly discharged VSS potential
“H” “H” Starts Set value “H” or “L”
S-1702Bxx, Fxx
ON / OFF Pin RESX Pin Regulator Block
Regulator Output
(VOUT)
Detector Output
(VDOUT)
“L” “L” Stops Forcibly discharged VSS potential
“L” “H” Stops Forcibly discharged VSS potential
“H” “L” Starts Set value VSS potential
“H” “H” Starts Set value “H” or “L”
S-1702Cxx, Gxx
ON / OFF Pin RESX Pin Regulator Block
Regulator Output
(VOUT)
Detector Output
(VDOUT)
“L” “L” Stops Forcibly discharged VSS potential
“L” “H” Stops
Not forcibly
discharged “H” or “L”
“H” “L” Stops Forcibly discharged VSS potential
“H” “H” Starts Set value “H” or “L”
S-1702Dxx, Hxx
ON / OFF Pin RESX Pin Regulator Block
Regulator Output
(VOUT)
Detector Output
(VDOUT)
“L” “L” Stops
Not forcibly
discharged VSS potential
“L” “H” Stops
Not forcibly
discharged “H” or “L”
“H” “L” Starts
Set value VSS potential
“H” “H” Starts
Set value “H” or “L”
S-1702Jxx, Lxx, Nxx
ON / OFF Pin Regulator Block Regulator Output
(VOUT)
Detector Output
(VDOUT)
“L” Stops Forcibly discharged VSS potential
“H” Starts Set value “H” or “L”
S-1702Kxx, Mxx, Pxx
ON / OFF Pin Regulator Block Regulator Output
(VOUT)
Detector Output
(VDOUT)
“L” Stops
Not forcibly
discharged “H” or “L”
“H” Starts Set value “H” or “L”
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1. 5 Equivalent circuits of ON / OFF and RESX pins
The ON / OFF and RESX pins are internally fixed to any one of three states; pulled-up (via a pull-up resistor),
pulled-down (via a pull-down resistor), or neither pulled-up nor pulled-down (no down pull-up / pull-down resistor).
For details, refer to “Table 3 Input Types of RESX and ON / OFF Pins”. The equivalent circuits are shown
below.
V
SS
ON / OFF
or
RESX
V
IN
V
SS
V
IN
V
IN
With pull-up resistor
V
SS
ON / OFF
or
RESX
V
IN
V
SS
V
IN
V
SS
With pull-down resistor
V
SS
ON / OFF
or
RESX
V
IN
V
SS
V
IN
Without pull-up / pull-down resistor
Figure 24 Equivalent Circuits of ON / OFF and RESX Pins
Caution In product without pull-up / pull-down resistor, do not use the ON / OFF and RESX pins in a floating
state.
Note that applying voltage of 0.3 V to 1.2 V may increase current consumption.
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2. Regulator block
2. 1 Basic operation
The error amplifier compares the reference voltage (Vref) with Vfb, which is the output voltage resistance divided
by feedback resistors Rs and Rf. It supplies the output transistor with the gate voltage necessary to ensure a
certain output voltage free of any fluctuations of input voltage and temperature.
The regulator output voltage (VOUT) of the S-1702 Series can be selected from a value between 1.5 V and 5.5 V.
The block diagram of the regulator block is shown below.
VOUT
*1
*1. Parasitic diode
VSS
VIN
Error amplifier
Current
supply
Vref
Vfb
VOUT
Rs
Rf
−
+
Reference
voltage circuit
VSS
VIN
Output transistor
Discharge
shunt
circuit
Output circuit
Figure 25 Block Diagram (Regulator Block)
2. 2 Output circuit
The output circuit of the regulator block consists of an output transistor and a discharge shunt circuit.
The discharge shunt function is enabled or disabled for the VOUT pin. Refer to “Table 1 Product Types” for
details. The equivalent circuits are shown below.
VOUT
*1
VIN
VSS VSS VSS
Vfb
VOU
T
Rs
Rf
Discharge shunt function: enabled
VOUT
*1
VIN
VSS VSS VSS
VSS
Vfb
VOU
T
Rs
Rf
Discharge shunt function: disabled
*1. Parasitic diode
Figure 26 Equivalent Circuits of VOUT Pin
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2. 2. 1 Output transistor
The S-1702 Series regulator block uses a low on-resistance Pch MOSFET transistor as the output transistor.
Caution Be sure that VOUT does not exceed VIN + 0.3 V to prevent the voltage regulator from being
damaged due to inverse current flowing from the VOUT pin through a parasitic diode to the
VIN pin.
2. 2. 2 Discharge shunt function
The discharge shunt function is enabled in the S-1702Axx, Bxx, Cxx, Exx, Fxx, Gxx, Jxx, Lxx, and Nxx.
When the regulator block is stopped, the output transistor is turned off and the discharge shunt circuit is
turned on according to the combination of the ON / OFF and the RESX pins.
This operation causes the charge in the output capacitor (CL) to be discharged, and forcibly sets the VOUT
pin the VSS level.
The VOUT pin is set at the VSS level in a shorter time than the S-1702Dxx, Hxx, Kxx, Mxx, and Pxx, because
they disable the discharge shunt function.
ON / OFF
VSS
Output transistor: OFF
Discharge
shunt circuit :
ON
VOUT
*1. Parasitic diode
Current flow
GND
Output capacitor
S-1702 Series
RESX
*1
VIN V
OUT
−
+
ON / OFF
circuit
V
IN
*1
Logic
circuit
Reset circuit
Reference
voltage
circuit
C
L
V
ref
V
fb
R
s
R
f
Figure 27 Discharge Shunt Function
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3. Detector block
3. 1 Basic operation
Figure 28 shows a block diagram of the detector block.
R
c
R
b
Delay
circuit VDOUT
VIN
Current
supply
V
ref
V
DOUT
+
−
V
IN
CD
SENSE V
SENSE
Output
circuit
R
a
VSS
V
SS
V
SS
N
1
C
D
Figure 28 Block Diagram (Detector Block)
(1) When the SENSE voltage (VSENSE) is the release voltage (+VDET) or more, the VDOUT pin outputs “H”.
((1) in Figure 29)
In this case, the transistor (N1) is off and the input voltage to the comparator is
(R
b
+ R
c
) • V
SENSE
R
a
+ R
b
+ R
c
.
(2) Although the SENSE voltage (VSENSE) drops to the release voltage (+VDET) or less, the VDOUT pin outputs
“H” when the SENSE voltage (VSENSE) is the detection voltage (−VDET) or more.
If the SENSE voltage (VSENSE) is the detection voltage (−VDET) or less (refer to point A in Figure 29), the
VDOUT pin outputs “L” ((2) in Figure 29).
The transistor (N1) is turned on and the input voltage to the comparator is
R
b
• V
SENSE
R
a
+ R
b
.
(3) If the VIN input voltage (VIN) further drops to the lowest operating voltage of the S-1702 Series, the VDOUT
pin is sets in high impedance.
If the VDOUT pin is pulled up to the regulator output voltage (VOUT), the VDOUT pin outputs VOUT (“H”) ((3)
in Figure 29).
(4) If the VIN input voltage (VIN) rises to the lowest operating voltage or more, the VDOUT pin outputs “L”.
Although the SENSE voltage (VSENSE) excceds the detection voltage (−VDET), it is the release voltage
(+VDET) or less, the VDOUT pin outputs “L” ((4) in Figure 29).
(5) If the SENSE voltage (VSENSE) rises to the release voltage (+VDET) or more (see point B in Figure 29), the
VDOUT pin outputs “H”. The VDOUT pin outputs “H” after it is delayed for tD by the delay circuit ((5) in
Figure 29).
In the S-1702 Series, the detection voltage (VDOUT) can be set within the range of 1.3 V to 5.2 V (operating voltage
range: VIN = 0.8 V to 6.5 V).
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A
B
V
DD
t
D
V
SS
Lowest operating voltage
VDOUT
V
SENSE
(V
IN
)
*1
V
SS
(1)
Hysteresis width (V
HYS
) Release volta
g
e
(
+V
DET
)
Detection voltage (–V
DET
)
*1. When the SENSE pin is connected to the VIN pin.
(2)
(3) (4)
(5)
Figure 29 Operation
3. 1. 1 Regulator output voltage (VOUT) detection types (S-1702Axx, Bxx, Cxx, Dxx, Lxx, Mxx)
Each detector block of S-1702Axx, Bxx, Cxx, Dxx, Lxx, and Mxx detects the regulator output voltage (VOUT).
R
c
R
b
Delay
circuit VDOUT
VIN
Current
supply
V
ref
V
DOUT
+
−
V
IN
CD
*1
V
OUT
Output
circuit
R
a
V
SS
N
1
C
D
VSS
V
SS
*1. S-1702Lxx and S-1702Mxx only
Figure 30 Block Diagram (Regulator Output Voltage (VOUT) Detection Type)
Caution If the input voltage or load current changes transiently, undershoot or overshoot occurs in
the regulator output voltage (VOUT). In the product types that the regulator output voltage is
detected by the detector, if the output voltage reaches the detection voltage or less due to
undershoot, the detector operates so that a reset signal may be output. To prevent this, set
the value of the capacitor so that the value of undershoot is the minimum, or set the voltage
range in which the difference of the output voltage and the detection voltage is undershoot
or more.
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3. 1. 2 Input voltage (VIN) detection types (S-1702Exx, Fxx, Gxx, Hxx, Nxx, Pxx)
Each detector block of S-1702Exx, Fxx, Gxx, Hxx, Nxx, and Pxx detects the input voltage (VIN).
R
c
R
b
Delay
circuit VDOUT
VIN
Current
supply
V
ref
V
DOUT
+
−
V
IN
Output
circuit
R
a
V
SS
N
1
C
D
VSS
V
SS
*1. S-1702Nxx and S-1702Pxx only
CD
*1
Figure 31 Block Diagram (Input Voltage (VIN) Detection Type)
3. 1. 3 SENSE voltage (VSENSE) detection types (S-1702Jxx, Kxx)
Each detector block of S-1702Jxx and Kxx detects the SENSE voltage (VSENSE).
R
c
R
b
Delay
circuit VDOUT
VIN
Current
supply
V
ref
V
DOUT
+
−
V
IN
SENSE V
SENSE
Output
circuit
R
a
N
1
VSS
V
SS
Figure 32 Block Diagram (SENSE Voltage (VSENSE) Detection Type)
Caution Use the SENSE pin as an input pin when detecting the external power supply voltage. If
applying an input voltage (VIN) while a potential is being applied to the SENSE pin, an error
occurs in the release voltage of the detector. Apply a voltage to the SENSE pin after applying
the input voltage (VIN).
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3. 2 Delay circuit
3. 2. 1 Internal delay types (S-1702Axx, Bxx, Cxx, Dxx, Exx, Fxx, Gxx, Hxx, Jxx, Kxx)
In the internal delay types, when VSENSE is turned on, the delay circuit makes a certain delay, after the point
when VSENSE has reached the release voltage (+VDET), and sets the VDOUT pin to output an output signal
(refer to point B in Figure 29). The delay circuit does not make delay when VSENSE is the detection voltage
(−VDET) or less (refer to point A in Figure 29).
The delay time (tD) is fixed in the internal circuit of internal delay types.
3. 2. 2 External delay types (S-1702Lxx, Mxx, Nxx, Pxx)
In the external delay types, the delay time of the detection signal can be set by connecting a capacitor (CD)
between the CD and VSS pins.
The delay time (tD) is determined according to the built-in constant current, approx. 100 nA (typ.), and the time
constant of the external capacitor (CD), and can be calculated by the following equation.
tD [ms] = Delay constant × CD [nF]
The delay constant (Ta = +25°C) is as follows.
Delay constant: 5.3 (min.), 6.3 (typ.), 7.3 (max.)
Figure 33 shows the equivalent circuit of the CD pin (external delay type).
VSS
CD
VSS
VIN VIN
CD
VSS
Figure 33 Equivalent Circuit of CD Pin (External Delay Type)
Caution 1. Design the board so that a current will not flow into or flow out from the CD (RESX) pin,
because this pin’s impedance is high. (Otherwise that may provide incorrect delay time.)
2. There is no limit for the capacitance of the external capacitor (CD) as long as the leakage
current of the capacitor can be ignored against the built-in constant current value.
Leakage current causes deviation in delay time. When the leakage current is the built-in
constant current or more, the IC does not release.
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30
3. 3 Output Circuit
Either Nch open drain output, CMOS output (VOUT drive), or CMOS output (VIN drive) is used for the VDOUT pin.
For details, refer to “Table 2 Output Types of VDOUT Pin”. The equivalent circuits are shown below.
VDOUT
VSS VSS
VDOUT
Nch open drain output
*1
VOUT
VSS VSS
VDOUT
VDOUT
CMOS output (VOUT drive)
*1
VIN
VSS VSS
VDOUT
VDOUT
CMOS output (VIN drive)
*1. Parasitic diode
Figure 34 Equivalent Circuits of VDOUT Pin
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 31
4. Relation of temperature coefficients of detector and regulator blocks
The S-1702 Series has a detector and a regulator in it, and each reference voltage circuit has the same structure so
that both temperature coefficients of detector detection voltage and regulator output interlock.
4. 1 Positive temperature coefficient of regulator output
If the temperature coefficient of regulator output is positive, so is that of detector detection voltage (Figure 35).
85
Temperature gradient of detector
Ta [°C]
25
−40
−V
DET
[V]
Temperature gradient of regulator
Figure 35 Relation of Temperature Coefficients of Detector and Regulator (When They Are Positive)
4. 2 Negative temperature coefficient of regulator output
If the temperature coefficient of regulator output is negative, so is that of detector detection voltage (Figure 36).
85
Ta [°C]
25
−40
−V
DET
[V]
Temperature gradient of detecto
r
Temperature gradient of regulator
Figure 36 Relation of Temperature Coefficients of Detector and Regulator (When They Are Negative)
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
32
Precautions
• Wiring patterns for the VIN, VOUT and GND pins should be designed so that the impedance is low. When
mounting an output capacitor between the VOUT and VSS pins (CL) and a capacitor for stabilizing the input
between the VIN and VSS pins (CIN), the distance from the capacitors to these pins should be as short as
possible.
• Note that the output voltage may increase when a series regulator is used at low load current (1.0 mA or less).
• Generally a series regulator may cause oscillation depending on the selection of external parts. The following
conditions are recommended for this IC. However, be sure to perform sufficient evaluation under the actual usage
conditions for selection, including evaluation of temperature characteristics.
Input capacitor (CIN): 1.0 μF or more
Output capacitor (CL): 1.0 μF or more
Equivalent series resistance (ESR): 10 Ω or less
• The voltage regulator may oscillate when the impedance of the power supply is high and the input capacitor is
small or an input capacitor is not connected.
• The application conditions for the input voltage, output voltage, and load current should not exceed the package
power dissipation.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
• In determining the output current, attention should be paid to the output current value specified in Table 7 of “
Electrical Characteristics” and footnote *8 of the table.
• SII claims no responsibility for any disputes arising out of or in connection with any infringement by products
including this IC of patents owned by a third party.
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 33
Characteristics (Typical Data)
1. Entire circuit
Current consumption during operation*1 vs. Input voltage (Ta = +25°C)
V
OUT = 1.5 V VOUT = 3.1 V
02 567
ISS [μA]
10
8
0
VIN [V]
134
12
6
4
2
Ta = 85°C
Ta = 25°C
Ta = −40°C
02 567
ISS [μA]
10
8
0
VIN [V]
134
12
6
4
2
Ta = 85°C
Ta = 25°C
Ta = −40°C
V
OUT = 5.5 V
02 567
I
SS
[μA]
10
8
0
V
IN
[V]
134
12
6
4
2
Ta = 85°C
Ta = 25°C
Ta = −40°C
*1. Excluding current flowing in pull-up and pull-down resistors connected to the ON / OFF or RESX pins
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
34
2. Regulator block
2. 1 Output voltage vs. Output current (when load current increases) (Ta = +25°C)
V
OUT = 1.5 V VOUT = 3.1 V
0 100 200 450
V
OUT
[V]
3.0
1.0
0
I
OUT
[mA]
300
4.0
2.0
350 40025015050
VIN = 3.4 V
VIN = 4.0 V
VIN = 5.0 V
VIN = 6.5 V
3.5
2.5
1.5
0.5
V
OUT = 5.5 V
0 100 200 450
V
OUT
[V]
5
3
1
0
I
OUT
[mA]
6
300
4
2
350 40025015050
V
IN
= 5.8 V
V
IN
= 6.0 V
V
IN
= 6.5 V
Remark In determining the output current,
attention should be paid to the followings.
(1) The minimum output current value and
footnote *8 in Table 7 of “ Electrical
Characteristics”.
(2) Power dissipation of package
2. 2 Output voltage vs. Input voltage (Ta = +25°C)
V
OUT = 1.5 V VOUT = 3.1 V
1.0 1.5 2.0 2.5 3.0
V
OUT
[V]
1.6
1.5
1.4
1.3
1.2
1.1
1.0
V
IN
[V]
3.5
I
OUT
= −1 mA
I
OUT
= −30 mA
I
OUT
= −100 mA
VOUT [V]
3.2
3.0
2.9
2.8
2.7
2.6
2.5
IOUT = −1 mA
IOUT = −30 mA
IOUT = −100 mA
2.5 3.0 3.4 4.0 4.5
VIN [V]
5.0
3.1
V
OUT = 5.5 V
4.5 5.0 5.5 6.0
VOUT [V]
5.6
5.3
5.1
5.0
4.8
4.7
4.5
VIN [V]
6.5
4.6
4.9
5.2
5.4
5.5
IOUT = −1 mA
IOUT = −30 mA
IOUT = −100 mA
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 35
2. 3 Dropout voltage vs. Output current
V
OUT = 1.5 V VOUT = 3.1 V
0 75 150
V
drop
[V]
0.5
0.4
0.3
0.2
0.1
0
I
OUT
[mA]
10050
Ta = 85°C
Ta = 25°C
Ta = −40°C
12525
0 75 150
V
drop
[V]
0.30
0.25
0.15
0.10
0.05
0
I
OUT
[mA]
10050 12525
0.20
Ta = 85°C
Ta = 25°C
Ta = −40°C
V
OUT = 5.5 V
0 75 150
V
drop
[V]
0.25
0.15
0.10
0.05
0
I
OUT
[mA]
10050 12525
0.20
Ta = 85°C
Ta = 25°C
Ta = −40°C
2. 4 Output voltage vs. Ambient temperature
V
OUT = 1.5 V VOUT = 3.1 V
−40 0 25 50 75
VOUT [V]
1.50
1.30
1.20
1.10
Ta [°C]
1.40
−25 85
1.45
1.35
1.25
1.15
−40 0 25 50 75
V
OUT
[V]
3.30
3.10
3.00
2.90
Ta [°C]
3.20
−25 85
3.25
3.15
3.05
2.95
V
OUT = 5.5 V
−40 0 25 50 75
VOUT [V]
5.70
5.50
5.40
5.30
Ta [°C]
5.60
−25 85
5.65
5.55
5.45
5.35
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
36
2. 5 Current consumption during operation at regulator block*1 vs. Input voltage
V
OUT = 1.5 V VOUT = 3.1 V
02 567
ISS1 [μA]
8
0
VIN [V]
134
10
6
4
2
Ta = 85°C
Ta = 25°C
Ta = −40°C
02 567
ISS1 [μA]
8
0
VIN [V]
134
10
6
4
2
Ta = 85°C
Ta = 25°C
Ta = −40°C
V
OUT = 5.5 V
02 567
I
SS1
[μA]
8
0
V
IN
[V]
134
10
6
4
2
Ta = 85°C
Ta = 25°C
Ta = −40°C
*1. Excluding current flowing in pull-up and pull-down resistors connected to the ON / OFF or RESX pins
2. 6 Ripple rejection ratio (Ta = +25°C)
V
OUT = 1.5 V, VIN = 2.5 V, CL = 1.0 μF V
OUT = 3.1 V, VIN = 4.1 V, CL = 1.0 μF
10 100 1k 10k 100k
Ripple Rejection [dB]
0
20
40
60
80
Frequency [Hz]
1M
100
I
OUT
= 1 mA
I
OUT
= 30 mA
I
OUT
= 150 mA
10 100 1k 10k 100k
Ripple Rejection [dB]
0
20
40
60
80
Frequency [Hz]
1M
100
IOUT = 1 mA
IOUT = 30 mA
IOUT = 150 mA
V
OUT = 5.5 V, VIN = 6.0 V, CL = 1.0 μF
10 100 1k 10k 100k
Ripple Rejection [dB]
0
20
40
60
80
Frequency [Hz]
1M
100
I
OUT
= 1 mA
I
OUT
= 30 mA
I
OUT
= 150 mA
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 37
3. Detector block
3. 1 Detection voltage vs. Ambient temperature
−VDET = 1.3 V −VDET = 2.75 V
−40 0 25 50 75
Detection Voltage [V]
1.50
1.30
1.20
1.10
Ta [°C]
1.40
−25 85
1.45
1.35
1.25
1.15
−VDET
+VDET
−40 0 25 50 75
Detection Voltage [V]
3.0
2.7
2.6
2.4
Ta [°C]
2.9
−25 85
2.8
2.5
−V
DET
+V
DET
−VDET = 5.2 V
−40 0 25 50 75
Detection Voltage [V]
5.5
5.0
Ta [°C]
−25 85
5.4
5.3
5.2
5.1 −VDET
+VDET
3. 2 Hysteresis width vs. Ambient temperature
−VDET = 1.3 V −VDET = 2.75 V
−40 0 25 50 75
Hysteresis [%]
6
3
2
0
Ta [°C]
5
−25 85
4
1
S-1702xAx, xBx, xCx
S-1702xDx, xEx, xFx
S-1702xGx, xHx, xJx
−40 0 25 50 75
Hysteresis [%]
6
3
2
0
Ta [°C]
5
−25 85
4
1
S-1702xAx, xBx, xCx
S-1702xDx, xEx, xFx
S-1702xGx, xHx, xJx
−VDET = 5.2 V
−40 0 25 50 75
Hysteresis [%]
6
3
2
0
Ta [°C]
5
−25 85
4
1
S-1702xAx, xBx, xCx
S-1702xDx, xEx, xFx
S-1702xGx, xHx, xJx
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
38
3. 3 Current consumption during operation at detector block*1 vs. Input voltage
−VDET = 1.3 V −VDET = 2.75 V
0 2 5 6 6.5
ISS2 [μA]
2.5
2.0
0
V
IN
[V]
134
3.5
1.5
1.0
0.5
3.0
Ta = 85°C
Ta = 25°C
Ta = −40°C
0 2 5 6 6.5
I
SS2
[μA]
2.5
2.0
0
V
IN
[V]
134
3.5
1.5
1.0
0.5
Ta = 85°C
Ta = 25°C
Ta = −40°C
3.0
−VDET = 5.2 V
0 2 5 6 6.5
I
SS2
[μA]
2.5
2.0
0
V
IN
[V]
134
3.5
1.5
1.0
0.5
Ta = 85°C
Ta = 25°C
Ta = −40°C
3.0
*1. Excluding current flowing in pull-up and pull-down resistors connected to the ON / OFF or RESX pins
3. 4 Detector output voltage vs. Nch transistor
characteristics (ID vs. VDS characteristics)
3. 5 Detector output voltage vs. Pch transistor
characteristics (ID vs. VDS characteristics)
(Ta =
+
25°C) (Ta =
+
25°C)
02456
ID [mA]
20
15
0
VDS [V]
13
30
10
5
25
V
IN
= 4.0 V
V
IN
= 3.0 V
V
IN
= 2.0 V
V
IN
= 1.3 V
V
IN
= 5.0 V
02456
ID [mA]
20
15
0
VDS [V]
13
30
10
5
25
V
IN
= 4.0 V
V
IN
= 3.0 V
V
IN
= 2.0 V
V
IN
= 1.5 V
V
IN
= 5.0 V
3. 6 Detector output voltage vs. Input voltage
CMOS output Nch open drain output
0 0.4 1.0 1.2 1.4
VDOUT [V]
5
4
0
VIN [V]
0.2 0.6 0.8
6
3
2
1
Ta = 85°C
Ta = 25°C
Ta = −40°C
0 0.4 1.0 1.2 1.4
V
DOUT
[V]
0.5
0.4
0
V
IN
[V]
0.2 0.6 0.8
0.6
0.3
0.2
0.1
Ta = 85°C
Ta = 25°C
Ta = −40°C
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.2.1_00 S-1702 Series
Seiko Instruments Inc. 39
Reference Data
1. Input transient response characteristics (Ta = +25°C)
IOUT = 30 mA, tr = tf = 5.0 μs, CL = 1.0 μF, CIN = 1.0 μF
VOUT = 1.5 V, VIN = 2.5 V ↔ 3.5 V
IOUT = 30 mA, tr = tf = 5.0 μs, CL = 1.0 μF, CIN = 1.0 μF
VOUT = 3.1 V, VIN = 4.1 V ↔ 5.1 V
V
OUT
[V]
1.60
1.58
1.56
1.54
1.52
1.50
1.48
1.46
1.44
t [μs]
V
IN
[V]
4.0
3.0
2.5
2.0
0
0.5
1.0
1.5
3.5
−50 200 3000 50 100 150 250 350−100
V
OUT
V
IN
V
OUT
[V]
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.00
2.95
t [μs]
V
IN
[V]
5.5
4.5
4.0
3.5
1.5
2.0
2.5
3.0
5.0
−50 200 3000 50 100 150 250 350−100
V
OUT
V
IN
2. Load transient response characteristics (Ta = +25°C)
VIN = 2.5 V, CL = 1.0 μF, CIN = 1.0 μF
VOUT = 1.5 V, IOUT = 50 mA ↔ 100 mA
VIN = 4.0 V, CL = 1.0 μF, CIN = 1.0 μF
VOUT = 3.1 V, IOUT = 50 mA ↔ 100 mA
V
OUT
[V]
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
t [μs]
I
OUT
[mA]
150
50
0
−200
−150
−100
−50
100
−50 200 3000 50 100 150 250 350−100
V
OUT
I
OUT
V
OUT
[V]
3.30
3.25
3.20
3.15
3.10
3.05
3.00
2.95
t [μs]
I
OUT
[mA]
150
50
0
−50
−200
−150
−100
100
−50 200 3000 50 100 150 250 350−100
V
OUT
I
OUT
VIN = 6.0 V, CL = 1.0 μF, CIN = 1.0 μF
VOUT = 5.5 V, IOUT = 50 mA ↔ 100 mA
V
OUT
[V]
6.40
6.20
6.00
5.80
5.60
5.40
5.20
5.00
t [μs]
I
OUT
[mA]
150
50
0
−50
−200
−150
−100
100
−50 200 3000 50 100 150 250 350−100
V
OUT
I
OUT
SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series Rev.2.1_00
Seiko Instruments Inc.
40
3. ON/OFF pin transient response characteristics (Ta = +25°C)
VIN = 2.5 V, CL = 1.0 μF, CIN = 1.0 μF, IOUT = 100 mA
VOUT = 1.5 V, VON / OFF = 0 V → 2.5 V
VIN = 4.0 V, CL = 1.0 μF, CIN = 1.0 μF, IOUT = 100 mA
VOUT = 3.1 V, VON / OFF = 0 V → 4.0 V
V
OUT
[V]
5.0
4.0
3.0
2.0
1.0
0
−
1.0
t [μs]
V
ON / OFF
[V]
3.0
1.0
0
−3.0
−2.0
−1.0
2.0
300 4000 100 200 500−100
V
OUT
V
IN
V
OUT
[V]
10.0
8.0
6.0
4.0
2.0
0
−
2.0
t [μs]
V
ON / OFF
[V]
6.0
2.0
0
−6.0
−4.0
−2.0
4.0
300 4000 100 200 500−100
V
OUT
V
IN
VIN = 6.0 V, CL = 1.0 μF, CIN = 1.0 μF, IOUT = 100 mA
VOUT = 5.5 V, VON / OFF = 0 V → 6.5 V
V
OUT
[V]
14.0
12.0
8.0
6.0
4.0
0
−
2.0
t [μs]
V
ON / OFF
[V]
8.0
2.0
0
−8.0
−6.0
−2.0
4.0
300 4000 100 200 500−100
V
OUT
V
IN
6.0
−4.0
2.0
10.0
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
SNT-6A-A-PKG Dimensions
PG006-A-P-SD-2.0
No. PG006-A-P-SD-2.0
0.2±0.05
0.48±0.02
0.08 +0.05
-0.02
0.5
1.57±0.03
123
45
6
Feed direction
4.0±0.1
2.0±0.05
4.0±0.1
ø1.5 +0.1
-0
ø0.5
1.85±0.05 0.65±0.05
0.25±0.05
5°
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
PG006-A-C-SD-1.0
SNT-6A-A-Carrier Tape
No. PG006-A-C-SD-1.0
+0.1
-0
1
2
4
3
56
12.5max.
9.0±0.3
ø13±0.2
(60°) (60°)
QTY.
No. PG006-A-R-SD-1.0
PG006-A-R-SD-1.0
Enlarged drawing in the central part
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
SNT-6A-A-Reel
5,000
No.
TITLE
SCALE
UNIT mm
SNT-6A-A-Land Recommendation
Seiko Instruments Inc.
PG006-A-L-SD-4.0
No. PG006-A-L-SD-4.0
0.3
0.2
0.52
1.36
0.52
1
2
Caution 1. Do not do silkscreen printing and solder printing under the mold resin of the package.
2. The thickness of the solder resist on the wire pattern under the package should be 0.03 mm
or less from the land pattern surface.
3. Match the mask aperture size and aperture position with the land pattern.
4. Refer to "SNT Package User's Guide" for details.
1. (0.25 mm min. / 0.30 mm typ.)
2. (1.30 mm ~ 1.40 mm)
0.03 mm
SNT
1. Pay attention to the land pattern width (0.25 mm min. / 0.30 mm typ.).
2. Do not widen the land pattern to the center of the package ( 1.30 mm ~ 1.40 mm ).
1.
2.
※1. 䇋⊼ᛣ⛞Ⲭᓣⱘᆑᑺ(0.25 mm min. / 0.30 mm typ.)DŽ
※2. 䇋࣓ᇕ㺙Ё䯈ᠽሩ⛞Ⲭᓣ (1.30 mm ~ 1.40 mm)DŽ
⊼ᛣ1. 䇋࣓㛖ൟᇕ㺙ⱘϟ䴶ࠋϱ㔥ǃ⛞䫵DŽ
2. ᇕ㺙ϟǃᏗ㒓Ϟⱘ䰏⛞㝰ᑺ (Ң⛞Ⲭᓣ㸼䴶䍋) 䇋ࠊ0.03 mmҹϟDŽ
3. 㝰ⱘᓔষሎᇌᓔষԡ㕂䇋Ϣ⛞Ⲭᓣᇍ唤DŽ
4. 䆺㒚ݙᆍ䇋খ䯙 "SNTᇕ㺙ⱘᑨ⫼ᣛ"DŽ
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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