Rev.5.1
_00
HIGH RIPPLE-REJECTION AND LOW DROPOUT
CMOS VOLTAGE REGULATOR
S-1112/1122 Series
The S-1112/1122 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. Compared with the voltage regulators using the
conventional CMOS process, a larger variety of
capacitors are available, including small ceramic
capacitors. Small SNT-6A(H) (S-1112 Series only)
and SOT-23-5 packages realize high-density
mounting. In SOT-23-5, the lineup includes the S-
1112 and S-1122 Series, which differ in pin
configuration.
Features
1.5 V to 5.5 V, selectable in 0.1 V steps.
±1.0%
190 mV typ. (3.0 V output product, I
OUT
=
100 mA)
During operation: 50
µA
typ., 90
µA
max.
During shutdown: 0.1
µA
typ., 1.0
µA
max.
•
High peak current capability:
150 mA output is possible (at V
IN
≥
V
OUT(S)
+
1.0 V)
*1
Ensures long battery life.
•
Built-in ON/OFF circuit:
•
Low ESR capacitor can be used: A ceramic capacitor of 0.47
µF
or more can be used for the output
capacitor.
80 dB typ. (at 1.0 kHz)
•
High ripple rejection:
Overcurrent of output transistor can be restricted.
•
Built-in overcurrent protector:
SNT-6A(H)(S-1112 series only), SOT-23-5
•
Small package:
•
Lead-free products
*1.
Attention should be paid to the power dissipation of the package when the output current is large.
•
Output voltage:
•
High-accuracy output voltage:
•
Low dropout voltage:
•
Low current consumption:
Applications
•
Power supply for battery-powered devices
•
Power supply for personal communication devices
•
Power supply for home electric/electronic appliances
•
Power supply for cellular phones
Packages
Package name
SNT-6A(H)
SOT-23-5
Package
PI006-A
MP005-A
Drawing code
Tape
PI006-A
MP005-A
Reel
PI006-A
MP005-A
Land
PI006-A
Seiko Instruments Inc.
1
HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.5.1
_00
S-1112/1122 Series
Product Name Structure
•
The product types and output voltage for the S-1112/1122 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-1112 Series)
S-1112
x
xx
xx
-
xxx
TF
G
IC direction in tape specifications
Product name (abbreviation)
*2
Package name (abbreviation)
PI : SNT-6A(H)
MC : SOT-23-5
Output voltage
15 ~ 55
*1
(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 (ON/OFF pin) in the “
Operation”.
Seiko Instruments Inc.
3
HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.5.1
_00
S-1112/1122 Series
3. Product name (S-1122 Series)
S-1122
x
xx
MC
-
xxx
TF
G
IC direction in tape specifications
*1
Product name (abbreviation)
*2
Package name (abbreviation)
MC: SOT-23-5
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”.
Seiko Instruments Inc.
5
Programming Basics
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