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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.
1

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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
2 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
„ 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).
Seiko Instruments Inc.
3