S-1131 Datasheet PDF
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Rev.3.0_01
HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT
CMOS VOLTAGE REGULATOR
S-1131 Series
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The S-1131 Series is a positive voltage regulator
with a low dropout voltage, high output voltage
accuracy, and low current consumption developed
based on CMOS technology.
A built-in low on-resistance transistor provides a
low dropout voltage and large output current, and a
built-in overcurrent protector prevents the load
current from exceeding the current capacitance of
the output transistor. An ON/OFF circuit ensures a
long battery life, and small SOT-89-3, SOT-89-5
and 6-Pin HSON(A) packages realize high-density
mounting.
„ Features
Output voltage:
High-accuracy output voltage:
Low dropout voltage:
Low current consumption:
High peak current capability:
Built-in ON/OFF circuit:
High ripple rejection:
Built-in overcurrent protector:
Small package:
Lead-free products
1.5 V to 5.5 V, selectable in 0.1 V steps.
±1.0%
250 mV typ. (3.0 V output product, IOUT = 100 mA)
During operation: 35 µA typ., 65 µA max.
During shutdown: 0.1 µA typ., 1.0 µA max.
300 mA output is possible (at VIN VOUT(S) + 1.0 V)*1
Ensures long battery life.
70 dB typ. (at 1.0 kHz)
Overcurrent of output transistor can be restricted.
SOT-89-3, SOT-89-5, 6-Pin HSON(A)
*1. Attention should be paid to the power dissipation of the package when the output current is large.
„ Applications
Power supply for DVD and CD-ROM drives
Power supply for battery-powered devices
Power supply for personal communication devices
Power supply for note PCs
„ Packages
Package Name
SOT-89-3
SOT-89-5
6-Pin HSON(A)
Package
UP003-A
UP005-A
PD006-A
Drawing Code
Tape
UP003-A
UP005-A
PD006-A
Reel
UP003-A
UP005-A
PD006-A
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
„ Block Diagrams
(1) Without shutdown function (Package : SOT-89-3)
VIN
*1
VOUT
Overcurrent
protector
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+
Reference
voltage circuit
VSS
*1. Parasitic diode
Figure 1
(2) With shutdown function (Package : SOT-89-5, 6-Pin HSON(A))
*1
VIN
Overcurrent
protector
VOUT
ON/OFF
ON/OFF
circuit
+
Reference
voltage circuit
VSS
*1. Parasitic diode
Figure 2
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
„ Product Name Structure
The product types, output voltage and packages for the S-1131 Series can be selected at the user’s
request. Refer to the “Product name” for the meanings of the characters in the product name and
“Product name list” for the full product names.
1. Product name
S-1131 x
xx
xx – xxx
TF G
IC direction in tape specifications*1
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Product name (abbreviation)*2
Package name (abbreviation)
UA: SOT-89-3
UC: SOT-89-5
PD: 6-Pin HSON(A)
Output voltage
15 to 55
(e.g., when the output voltage is 1.5 V,
it is expressed as 15.)
Product type*3
A: ON/OFF pin negative logic
B: ON/OFF pin positive logic
*1. Refer to the taping specifications at the end of this book.
*2. Refer to the “Product name list”.
*3. Refer to 3. Shutdown pin (ON/OFF pin) in the “Operation” (Expect SOT-89-3).
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
2. Product name list
Table 1
Output voltage
1.5V±1.0%
1.6V±1.0%
1.7V±1.0%
1.8V±1.0%
www.DataSheet4U.co1m.9V±1.0%
2.0V±1.0%
2.1V±1.0%
2.2V±1.0%
2.3V±1.0%
2.4V±1.0%
2.5V±1.0%
2.6V±1.0%
2.7V±1.0%
2.8V±1.0%
2.9V±1.0%
3.0V±1.0%
3.1V±1.0%
3.2V±1.0%
3.3V±1.0%
3.4V±1.0%
3.5V±1.0%
3.6V±1.0%
3.7V±1.0%
3.8V±1.0%
3.9V±1.0%
4.0V±1.0%
4.1V±1.0%
4.2V±1.0%
4.3V±1.0%
4.4V±1.0%
4.5V±1.0%
4.6V±1.0%
4.7V±1.0%
4.8V±1.0%
4.9V±1.0%
5.0V±1.0%
5.1V±1.0%
5.2V±1.0%
5.3V±1.0%
5.4V±1.0%
5.5V±1.0%
SOT-89-3
S-1131B15UA-N4ATFG
S-1131B16UA-N4BTFG
S-1131B17UA-N4CTFG
S-1131B18UA-N4DTFG
S-1131B19UA-N4ETFG
S-1131B20UA-N4FTFG
S-1131B21UA-N4GTFG
S-1131B22UA-N4HTFG
S-1131B23UA-N4ITFG
S-1131B24UA-N4JTFG
S-1131B25UA-N4KTFG
S-1131B26UA-N4LTFG
S-1131B27UA-N4MTFG
S-1131B28UA-N4NTFG
S-1131B29UA-N4OTFG
S-1131B30UA-N4PTFG
S-1131B31UA-N4QTFG
S-1131B32UA-N4RTFG
S-1131B33UA-N4STFG
S-1131B34UA-N4TTFG
S-1131B35UA-N4UTFG
S-1131B36UA-N4VTFG
S-1131B37UA-N4WTFG
S-1131B38UA-N4XTFG
S-1131B39UA-N4YTFG
S-1131B40UA-N4ZTFG
S-1131B41UA-N5ATFG
S-1131B42UA-N5BTFG
S-1131B43UA-N5CTFG
S-1131B44UA-N5DTFG
S-1131B45UA-N5ETFG
S-1131B46UA-N5FTFG
S-1131B47UA-N5GTFG
S-1131B48UA-N5HTFG
S-1131B49UA-N5ITFG
S-1131B50UA-N5JTFG
S-1131B51UA-N5KTFG
S-1131B52UA-N5LTFG
S-1131B53UA-N5MTFG
S-1131B54UA-N5NTFG
S-1131B55UA-N5OTFG
SOT-89-5
S-1131B15UC-N4ATFG
S-1131B16UC-N4BTFG
S-1131B17UC-N4CTFG
S-1131B18UC-N4DTFG
S-1131B19UC-N4ETFG
S-1131B20UC-N4FTFG
S-1131B21UC-N4GTFG
S-1131B22UC-N4HTFG
S-1131B23UC-N4ITFG
S-1131B24UC-N4JTFG
S-1131B25UC-N4KTFG
S-1131B26UC-N4LTFG
S-1131B27UC-N4MTFG
S-1131B28UC-N4NTFG
S-1131B29UC-N4OTFG
S-1131B30UC-N4PTFG
S-1131B31UC-N4QTFG
S-1131B32UC-N4RTFG
S-1131B33UC-N4STFG
S-1131B34UC-N4TTFG
S-1131B35UC-N4UTFG
S-1131B36UC-N4VTFG
S-1131B37UC-N4WTFG
S-1131B38UC-N4XTFG
S-1131B39UC-N4YTFG
S-1131B40UC-N4ZTFG
S-1131B41UC-N5ATFG
S-1131B42UC-N5BTFG
S-1131B43UC-N5CTFG
S-1131B44UC-N5DTFG
S-1131B45UC-N5ETFG
S-1131B46UC-N5FTFG
S-1131B47UC-N5GTFG
S-1131B48UC-N5HTFG
S-1131B49UC-N5ITFG
S-1131B50UC-N5JTFG
S-1131B51UC-N5KTFG
S-1131B52UC-N5LTFG
S-1131B53UC-N5MTFG
S-1131B54UC-N5NTFG
S-1131B55UC-N5OTFG
Remark Please contact the SII marketing department for type A products.
6-Pin HSON(A)
S-1131B15PD-N4ATFG
S-1131B16PD-N4BTFG
S-1131B17PD-N4CTFG
S-1131B18PD-N4DTFG
S-1131B19PD-N4ETFG
S-1131B20PD-N4FTFG
S-1131B21PD-N4GTFG
S-1131B22PD-N4HTFG
S-1131B23PD-N4ITFG
S-1131B24PD-N4JTFG
S-1131B25PD-N4KTFG
S-1131B26PD-N4LTFG
S-1131B27PD-N4MTFG
S-1131B28PD-N4NTFG
S-1131B29PD-N4OTFG
S-1131B30PD-N4PTFG
S-1131B31PD-N4QTFG
S-1131B32PD-N4RTFG
S-1131B33PD-N4STFG
S-1131B34PD-N4TTFG
S-1131B35PD-N4UTFG
S-1131B36PD-N4VTFG
S-1131B37PD-N4WTFG
S-1131B38PD-N4XTFG
S-1131B39PD-N4YTFG
S-1131B40PD-N4ZTFG
S-1131B41PD-N5ATFG
S-1131B42PD-N5BTFG
S-1131B43PD-N5CTFG
S-1131B44PD-N5DTFG
S-1131B45PD-N5ETFG
S-1131B46PD-N5FTFG
S-1131B47PD-N5GTFG
S-1131B48PD-N5HTFG
S-1131B49PD-N5ITFG
S-1131B50PD-N5JTFG
S-1131B51PD-N5KTFG
S-1131B52PD-N5LTFG
S-1131B53PD-N5MTFG
S-1131B54PD-N5NTFG
S-1131B55PD-N5OTFG
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
„ Pin Configuration
SOT-89-3
Top view
Pin No.
1
2
3
Table 2
Symbol
VOUT
VSS
VIN
Description
Output voltage pin
GND pin
Input voltage pin
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12 3
Figure 3
SOT-89-5
Top view
54
12 3
Figure 4
Table 3
Pin No.
1
2
3
4
5
Symbol
VOUT
VSS
NC*1
ON/OFF
VIN
Description
Output voltage pin
GND pin
No connection
Shutdown pin
Input voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
6-Pin HSON(A)
Top view
654
123
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123
*1
Table 4
Pin No.
1
2
3
4
5
6
Symbol
VOUT
VSS
NC*1
NC*1
ON/OFF
VIN
Description
Output voltage pin
GND pin
No connection
No connection
Shutdown pin
Input voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
654
*2
*1. Connect the exposed thermal die
pad at shadowed area to the
board, and set electric potential
open or VSS.
However, do not use it as the
function of electrode.
*2. Be careful of the contact with
other wires because the pinch
lead has the same electric
potential as VSS.
Figure 5
„ Absolute Maximum Ratings
Table 5
Item
Input voltage
Output voltage
Power
dissipation
SOT-89-3
SOT-89-5
6-Pin HSON(A)
Operating ambient temperature
Storage temperature
Symbol
VIN
VON/OFF
VOUT
PD
Topr
Tstg
(Ta = 25°C unless otherwise specified)
Absolute Maximum Rating
Unit
VSS 0.3 to VSS + 7
VSS 0.3 to VIN + 0.3
VSS 0.3 to VIN + 0.3
500
V
V
V
mW
500 mW
500 mW
40 to +85
°C
40 to +125
°C
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.
6 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
„ Electrical Characteristics
Table 6
(Ta = 25°C unless otherwise specified)
Item Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Output voltage*1
VOUT(E)1 VIN = VOUT(S) + 1.0 V, IOUT = 30 mA
VOUT(S)
× 0.99
VOUT(S)
VOUT(S)
× 1.01
V
1
Output current*2
Dropout voltage*3
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Line regulation
Load regulation
Output voltage
temperature coefficient*4
VOUT(E)2 VIN = VOUT(S) + 1.0 V, IOUT = 80 mA
IOUT VIN VOUT(S) + 1.0 V
Vdrop
IOUT = 100 mA
VOUT(S) = 1.5 V
VOUT(S) = 1.6 V
VOUT(S) = 1.7 V
VOUT(S) = 1.8 V
VOUT(S) = 1.9 V
VOUT(S) = 2.0 V
VOUT(S) = 2.1 V
2.2 V VOUT(S) 2.5 V
2.6 V VOUT(S) 3.3 V
3.4 V VOUT(S) 5.5 V
VOUT1 VOUT(S) + 0.5 V VIN 6.5 V,
VINVOUT IOUT = 80 mA
VOUT2
VIN = VOUT(S) + 1.0 V,
1.0 mA IOUT 80 mA
VOUT VIN = VOUT(S) + 1.0 V, IOUT = 10 mA,
TaVOUT 40°C Ta 85°C
VOUT(S)
× 0.98
300*5
VOUT(S)
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.25
0.20
0.05
VOUT(S)
× 1.02
1.05
0.95
0.85
0.75
0.65
0.60
0.55
0.49
0.34
0.28
V
mA
V
V
V
V
V
V
V
V
V
V
0.2 % / V
1
3
1
1
1
1
1
1
1
1
1
1
1
20 40 mV 1
±100
ppm
/ °C
1
Current consumption
during operation
ISS1
VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON,
no load
35 65 µA 2
Input voltage
VIN
2.0 6.5 V
Ripple rejection
Short-circuit current
Current consumption
during shutdown
RR VIN = VOUT(S) + 1.0 V, f = 1.0 kHz,
Vrip = 0.5 Vrms, IOUT = 80 mA
Ishort
VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON,
VOUT = 0 V
ISS2
VIN = VOUT(S) + 1.0 V, ON/OFF pin = OFF,
no load
70 dB 5
450 mA 3
0.1 1.0 µA 2
Shutdown pin
input voltage “H”
VSH VIN = VOUT(S) + 1.0 V, RL = 1.0 k
1.5
V4
Shutdown pin
input voltage “L”
VSL VIN = VOUT(S) + 1.0 V, RL = 1.0 k
  0.3 V 4
Shutdown pin
input current “H”
ISH VIN = 6.5 V, VON/OFF = 6.5 V
0.1
0.1 µA 4
Shutdown pin
input current “L”
ISL VIN = 6.5 V, VON/OFF = 0 V
0.1
0.1 µA 4
*1. VOUT(S): Specified output voltage
VOUT(E)1: Actual output voltage at the fixed load
The output voltage when fixing IOUT(= 30 mA) and inputting VOUT(S) + 1.0 V
VOUT(E)2: Actual output voltage at the fixed load
The output voltage when fixing IOUT(= 80 mA) and inputting VOUT(S) + 1.0 V
*2. The output current at which the output voltage becomes 95% of VOUT(E)1 after gradually increasing the output current.
*3. 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.
*4. The change in temperature [mV/°C] is calculated using the following equation.
[ ] [ ] [ ]VOUT
Ta
mV/°C
= V V*1
OUT(S)
*2 ×
VOUT
Ta VOUT
ppm/°C
*3 ÷ 1000
*1. The change in temperature of the output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
*5. 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.
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
„ Test Circuits
1.
VIN VOUT
ON/OFF*1 VSS
Set to
power on
+A
+
V
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3.
4.
Figure 6
A VIN VOUT
ON/OFF*1 VSS
Set to
VIN or GND
Figure 7
VIN VOUT
ON/OFF*1 VSS
Set to
power on
Figure 8
VIN VOUT
+
A
ON/OFF*1
VSS
+
A
+
V
+
V RL
Figure 9
5.
VIN VOUT
ON/OFF*1 VSS
Set to
power on
+
V RL
Figure 10
*1. In case of product with shutdown function.
8 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
„ Standard Circuit
Input
CIN*1
VIN VOUT
ON/OFF*2
VSS
Output
CL*3
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Single GND
GND
*1. CIN is a capacitor for stabilizing the input.
*2. In case of product with shutdown function.
*3. A tantalum capacitor (2.2 µF or more) can be used.
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.
„ Application Conditions
Input capacitor (CIN): 1.0 µF or more
Output capacitor (CL): 2.2 µF or more (tantalum capacitor)
Caution A general series regulator may oscillate, depending on the external components selected.
Check that no oscillation occurs with the application using the above capacitor.
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
„ Explanation of Terms
1. Low dropout voltage regulator
The low dropout voltage regulator is a voltage regulator whose dropout voltage is low due to its built-in
low on-resistance transistor.
2. 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 the product.
www.DataSheet4U.comCaution If the above conditions change, the output voltage value may vary and exceed the
accuracy range of the output voltage. Please see the electrical characteristics and
attached characteristics data for details.
3.
Line
regulation

VOUT1
VIN VOUT

Indicates the dependency of the output voltage on the input voltage. That is, the value shows how much
the output voltage changes due to a change in the input voltage with the output current remaining
unchanged.
4. Load regulation (VOUT2)
Indicates the dependency of the output voltage on the output current. That is, the value shows how
much the output voltage changes due to a change in the output current with the input voltage remaining
unchanged.
5. 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)
10 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
6.
Temperature coefficient of
output
voltage

VOUT
Ta VOUT

The shadowed area in Figure 12 is the range where VOUT varies in the operating temperature range
when the temperature coefficient of the output voltage is ±100 ppm/°C.
Ex. S-1131B28 Typ.
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VOUT
[V]
+0.28 mV / °C
VOUT(E)1*1
0.28 mV / °C
40 25
85 Ta [°C]
*1. VOUT(E)1 is the value of the output voltage measured at 25°C.
Figure 12
A change in the temperature of the output voltage [mV/°C] is calculated using the following equation.
[ ] [ ] [ ]VOUT
Ta
mV/°C *1 = VOUT(S) V
*2 ×
VOUT
Ta VOUT
ppm/°C
*3
÷ 1000
*1. Change in temperature of output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
„ Operation
1. Basic operation
Figure 13 shows the block diagram of the S-1131 Series.
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.
VIN
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Current
supply
Vref
Error
amplifier
+
Reference voltage
circuit
*1
Rf
Vfb
Rs
VOUT
VSS
*1. Parasitic diode
Figure 13
2. Output transistor
The S-1131 Series uses a low on-resistance P-channel MOS FET as the output transistor.
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 VOUT pin through a parasitic diode to VIN pin.
12 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
3. Shutdown pin (ON/OFF pin)
The products with shutdown function performs starting and a stop the regulator.
When the ON/OFF pin is set to the shutdown level, the operation of all internal circuits stops, and the built-
in P-channel MOS FET output transistor between the VIN pin and VOUT pin is turned off to substantially
reduce the current consumption. The VOUT pin becomes the Vss level due to the internally divided
resistance of several hundreds kbetween the VOUT pin and VSS pin.
The structure of the ON/OFF pin is 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 state. In addition, note that the current consumption
increases if a voltage of 0.3 V to VIN – 0.3 V is applied to the ON/OFF pin. When the ON/OFF pin is not
used, connect it to the VSS pin if the logic type is “A” and to the VIN pin if it is “B”.
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Table 7
Logic Type
A
A
B
B
ON/OFF Pin
“L”: Power on
“H”: Power off
“L”: Power off
“H”: Power on
Internal Circuits
Operating
Stopped
Stopped
Operating
VOUT Pin Voltage
Set value
VSS level
VSS level
Set value
Current Consumption
ISS1
ISS2
ISS2
ISS1
VIN
ON/OFF
VSS
Figure 14
„ Selection of Output Capacitor (CL)
The S-1131 Series performs phase compensation using the internal phase compensator in the IC and the ESR
(Equivalent Series Resistance) of the output capacitor to enable stable operation independent of changes in the
output load. Therefore, always place a capacitor (CL) of 2.2 µF or more between VOUT and VSS pins.
For stable operation of the S-1131 Series, it is essential to employ a capacitor whose ESR is within an optimum
range. Using a capacitor whose ESR is outside the optimum range (approximately 0.5 to 5 ), whether larger
or smaller, may cause an unstable output, resulting in oscillation. For this reason, a tantalum electrolytic
capacitor is recommended.
When a ceramic capacitor or an OS capacitor with a low ESR is used, it is necessary to connect an additional
resistor that serves as the ESR in series with the output capacitor. The required resistance value is
approximately 0.5 to 5 , which varies depending on the usage conditions, so perform sufficient evaluation for
selection. Ordinarily, around 1.0 is recommended.
Note that an aluminum electrolytic capacitor may increase the ESR at a low temperature, causing oscillation.
When using this kind of capacitor, perform thorough evaluation, including evaluation of temperature
characteristics.
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
„ 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 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).
This IC performs phase compensation by using an internal phase compensator and the ESR of an
output capacitor. Therefore, always place a capacitor of 2.2 µF or more between VOUT and VSS pins.
www.DataSheet4U.comA tantalum type capacitor is recommended. Moreover, to secure stable operation of the S-1131 Series,
it is necessary to employ a capacitor with an ESR within an optimum range (0.5 to 5 ). Using a
capacitor whose ESR is outside the optimum range (approximately 0.5 to 5 ), whether larger or
smaller, may cause an unstable output, resulting in oscillation. Perform sufficient evaluation under the
actual usage conditions for selection, including evaluation of temperature characteristics.
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
6 in the electrical characteristics and footnote *5) 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.
14 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
„ Characteristics (Typical Data)
(1) Output voltage vs. Output current (when load current increases)
S-1131B15 (Ta = 25°C)
S-1131B30 (Ta = 25°C)
2.5
2.0 V
2
1.5
1
www.DataSheet4U.co0m.5
VIN = 1.8 V
0
0 200 400
6.5 V
2.5 V
600 800
4
3.5
3
2.5
2
1.5
1
0.5
0
0
VIN = 3.3 V
200
3.5 V
400
IOUT [mA]
IOUT [mA]
4.0 V
6.5 V
600 800
S-1131B50 (Ta = 25°C)
6
5
4 VIN = 5.3 V
3 5.5 V
2 6.0 V
1
0
0 200 400
6.5 V
600 800
Remark In determining the output current, attention
should be paid to the following.
1) The minimum output current value and
footnote *5 in the electrical characteristics
2) The package power dissipation
IOUT [mA]
(2) Output voltage vs. Input voltage
S-1131B15 (Ta = 25°C)
1.6
50 mA
1.55
30 mA
1.5
1.45
IOUT = 1 mA
80 mA
1.4
1
1.5 2 2.5
VIN [V]
3
3.5
S-1131B50 (Ta = 25°C)
5.1
5.08
5.06
5.04
5.02
5
4.98
4.96
4.94
4.92
4.9
30 mA
IOUT = 1 mA
50 mA
80 mA
4.5 5 5.5 6 6.5
VIN [V]
7
S-1131B30 (Ta = 25°C)
3.05
3
2.95
50 mA
30 mA
2.9
IOUT = 1 mA
80 mA
2.85
2.8
2.5 3 3.5 4 4.5
VIN [V]
5
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
(3) Dropout voltage vs. Output current
S-1131B15
1.0
0.8
85°C
25°C
0.6
0.4
0.2
www.DataSheet4U.com 0
0
–40°C
50 100 150 200 250 300 350
IOUT [mA]
S-1131B50
1.0
0.8
0.6
0.4
0.2
0
0
85°C
25°C
–40°C
50 100 150 200 250 300 350
IOUT [mA]
(4) Dropout voltage vs. Set output voltage
0.4
0.35 150 mA
0.3
0.25
100 mA
0.2
0.15
0.1
0.05
0
50 mA
30 mA
10 mA
01234567
VOTA [V]
S-1131B30
1.0
0.8
0.6 85°C
0.4 25°C
0.2
00
–40°C
50 100 150 200 250 300 350
IOUT [mA]
16 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
(5) Output voltage vs. Ambient temperature
S-1131B15
1.6
1.55
1.5
1.45
www.DataSheet4U.com1.4
40 20
0
20
40
60 80 100
Ta [°C]
S-1131B50
5.1
5.08
5.06
5.04
5.02
5
4.98
4.96
4.94
4.92
4.9
40 20 0 20 40 60 80 100
Ta [°C]
(6) Current consumption vs. Input voltage
S-1131B15
45
40 25°C
35
30
25
20
15
10
5
0
0
2
40°C
4
85°C
6
VIN [V]
8
S-1131B50
45
40
35
30
25
20
15
10
5
0
0
85°C
2
40°C
4
VIN [V]
25°C
68
S-1131B30
3.1
3.05
3
2.95
2.9
40 20 0 20 40 60 80 100
Ta [°C]
S-1131B30
45
40
35 25°C
30 85°C
25
20
40°C
15
10
5
0
0 246
VIN [V]
8
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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
(7) Ripple rejection
S-1131B15 (Ta = 25°C)
VIN = 2.5 V, COUT = 2.2 µF
100
80 IOUT = 1 mA
60
40
www.DataSheet4U.com20
0
10
30 mA
100 1 k 10 k
Frequency [Hz]
80 mA
100 k 1 M
S-1131B50 (Ta = 25°C)
VIN = 6.0 V, COUT = 2.2 µF
100
80
60
IOUT = 1 mA
40
20
0
10
30 mA
80 mA
100 1 k 10 k
Frequency [Hz]
100 k
1M
S-1131B30 (Ta = 25°C)
VIN = 4.0 V, COUT = 2.2 µF
100
80
60
IOUT = 1 mA
40
20
0
10
30 mA
80 mA
100 1 k 10 k
Frequency [Hz]
100 k
1M
18 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.3.0_01
S-1131 Series
„ Reference Data
(1) Input transient response characteristics
IOUT = 80 mA, tr = tf = 5.0 µs, COUT = 2.2 µF, CIN = 0 µF
3.02
6
3.015
5
IOUT = 80 mA, tr = tf = 5.0 µs, COUT = 4.7 µF, CIN = 0 µF
3.02
6
3.015
5
3.01
3.005
3
4
VIN 3
VOUT
2
3.01
3.005
3
4
V IN 3
V OUT
2
www.DataSheet4U2.c.9o9m5
1
2.99
0
-20 0 20 40 60 80 100 120 140 160 180
2.995
1
2.99
0
-20 0 20 40 60 80 100 120 140 160 180
t [µs]
t [µs]
(2) Load transient response characteristics
VIN = 4.0 V, COUT = 2.2 µF, CIN = 1.0 µF,
IOUT = 50100 mA
3.2
150
3.15
100
VIN = 4.0 V, COUT = 4.7 µF, CIN = 1.0 µF,
IOUT = 50100 mA
3.2
3.15
150
100
3.1
3.05
IOUT
50
0
3.1
3.05
IOUT
50
0
3
2.95
VOUT
-50
-100
3
2.95
VOUT
-50
-100
2.9 -150
-2 0 2 4 6 8 10 12 14 16 18
2.9 -150
-2 0 2 4 6 8 10 12 14 16 18
t [µs]
t [µs]
(3) Shutdown pin transient response characteristics
S-1131B15 (Ta = 25°C)
S-1131B30 (Ta = 25°C)
VIN = 2.5 V, COUT = 2.2 µF, CIN = 1.0 µF
VIN = 4.0 V, COUT = 2.2 µF, CIN = 1.0 µF
2.5 3 5
6
2
VON/OFF
2
4
1.5 1 3
4
2
1
VOUT
0
2
VOUT VON/OFF
0
0.5 -1 1 -2
0 -2 0 -4
-0.5 -3
-10 0 10 20 30 40 50 60 70 80 90
-1 -6
-10 0 10 20 30 40 50 60 70 80 90
t [µs]
t [µs]
S-1131B50 (Ta = 25°C)
VIN = 6.0 V, COUT = 2.2 µF, CIN = 1.0 µF
7
6
5
4
3
2
1
0
-1
-10
0
V ON/OFF
10 20 30
8
6
4
V OUT
2
0
-2
-4
-6
-8
40 50 60 70 80 90
t [µs]
Seiko Instruments Inc.
19


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4.5±0.1
1.6±0.2
www.DataSheet4U.com
12
3
1.5±0.1 1.5±0.1
1.5±0.1
0.4±0.05
0.4±0.1
0.45±0.1
0.4±0.1
45°
No. UP003-A-P-SD-1.1
TITLE SOT893-A-PKG Dimensions
No.
SCALE
UNIT
UP003-A-P-SD-1.1
mm
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ø1.5
+0.1
-0
2.0±0.05
4.0±0.1(10 pitches : 40.0±0.2)
www.DataSheet4U.com
5° max.
ø1.5
+0.1
-0
4.75±0.1
8.0±0.1
0.3±0.05
2.0±0.1
Feed direction
No. UP003-A-C-SD-1.1
TITLE S O T 8 9 3 - A - C a r r i e r T a p e
No.
SCALE
UNIT
UP003-A-C-SD-1.1
mm
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16.5max.
Enlarged drawing in the central part
13.0±0.3
(60°) (60°)
No. UP003-A-R-SD-1.1
TITLE
No.
SCALE
UNIT
SOT893-A-Reel
UP003-A-R-SD-1.1
QTY. 1,000
mm
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4.5±0.1
1.6±0.2
54
www.DataSheet4U.com
12
3
1.5±0.1 1.5±0.1
1.5±0.1
0.4±0.05
0.4±0.1
0.45±0.1
0.4±0.1
0.3
45°
No. UP005-A-P-SD-1.1
TITLE SOT895-A-PKG Dimensions
No.
SCALE
UNIT
UP005-A-P-SD-1.1
mm
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ø1.5
+0.1
-0
2.0±0.05
4.0±0.1(10 pitches : 40.0±0.2)
www.DataSheet4U.com
5° max.
ø1.5
+0.1
-0
4.75±0.1
8.0±0.1
0.3±0.05
2.0±0.1
321
45
Feed direction
No. UP005-A-C-SD-1.1
TITLE
No.
SCALE
UNIT
SOT895-A-Carrier Tape
UP005-A-C-SD-1.1
mm
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16.5max.
Enlarged drawing in the central part
13.0±0.3
(60°) (60°)
No. UP005-A-R-SD-1.1
TITLE
No.
SCALE
UNIT
SOT895-A-Reel
UP005-A-R-SD-1.1
QTY.
1,000
mm
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0.5typ.
2.90±0.1
www.DataSheet4U.com
0.95±0.05
+0.1
0.30 -0.05
(1.5)
No. PD006-A-P-SD-4.0
The exposed thermal die pad has different
electric potential depending on the product.
Confirm specifications of each product.
Do not use it as the function of electrode.
TITLE
No.
SCALE
UNIT
HSON6A-A-PKG Dimensions
PD006-A-P-SD-4.0
mm
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4.0±0.1
2.0±0.05
ø1.55±0.05
1.5±0.1
3.3±0.1
4.0±0.1
ø1.05±0.05
0.2±0.05
31
46
Feed direction
No. PD006-A-C-SD-2.0
TITLE
No.
SCALE
UNIT
HSON6A-A-Carrier Tape
PD006-A-C-SD-2.0
mm
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12.5max.
Enlarged drawing in the central part
ø13±0.2
9.0±0.3
(60°) (60°)
No. PD006-A-R-SD-1.0
TITLE
No.
SCALE
UNIT
HSON6A-A-Reel
PD006-A-R-SD-1.0
QTY.
3000
mm
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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
mass-production design.
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 appropriate governmental authority.
Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Seiko Instruments Inc. is strictly prohibited.
The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus
installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc.
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 community damage that may ensue.



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