S-T111 Series
www.sii-ic.com
HIGH RIPPLE-REJECTION
LOW DROPOUT CMOS VOLTAGE REGULATOR
© Seiko Instruments Inc., 2003-2010 Rev.3.0_00
Seiko Instruments Inc.
1
The S-T111 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. A small SOT-
23-5 package realizes high-density mounting.
Features
• Output voltage:
1.5 V to 5.5 V, selectable in 0.1 V steps.
• High-accuracy output voltage: ±1.0%
• Low dropout voltage: 190 mV typ. (3.0 V output product, I
OUT
= 100 mA)
• Low current consumption: 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
• Built-in ON/OFF circuit:
Ensures long battery life.
• Low ESR capacitor can be used: A ceramic capacitor of 0.1 μF or more can be used for the output
capacitor.
• High ripple rejection:
80 dB typ. (at 1.0 kHz)
• Built-in overcurrent protector:
Overcurrent of output transistor can be restricted.
• Lead-free, Sn 100%, halogen-free
*2
*1. Attention should be paid to the power dissipation of the package when the output current is large.
*2. Refer to “ Product Name Structure” for details.
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
Package
• SOT-23-5
