S-1721 Series

www.sii-ic.com

SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION

LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR

© Seiko Instruments Inc., 2007-2010

Seiko Instruments Inc.

1

S-1721 Series, developed using the CMOS technology, is a 2-channel positive voltage regulator IC which has the low

dropout voltage, the high-accuracy output voltage and the low output current consumption of 150 mA.

Users are able to use a small ceramic capacitor of 1.0

μF for this IC. This IC includes two regulator circuits in the package

SOT-23-6 or super-small SNT-6A.

S-1721 Series has much lower current consumption than S-1711 Series, this IC is ideal for mobile devices.

Features

• Output voltage:

1.2 V to 5.0 V, selectable in 0.05 V step.

• A ceramic capacitor of 1.0 μF or more can be used as the I/O capacitor.

• Wide input voltage range:

1.7 V to 6.5 V

• High-accuracy output voltage:

±1.0%

• Low dropout voltage:

• Low current consumption:

During operation:

25

μA typ., 45 μA max. (products having the output of

3.0 V, per circuit)

During shutdown:

0.1

μA typ., 1.0 μA max.

• Output current:

• High ripple rejection:

80 dB typ. (products having the output under 1.8 V, at 1.0 kHz)

• Built-in overcurrent protector:

limits overcurrent of output transistor

• Built-in ON/OFF circuit:

Ensures long battery life.

• Pull-up or pull-down resistor can be selected.

*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 cellular phones

• Power supply for battery-powered devices

Packages

• SNT-6A

• SOT-23-6