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SC112

150mA Ultra Low Dropout

Micropower Linear Regulator

POWER MANAGEMENT

PRELIMINARY

Revision 1, January 2001

The SC112 is a 150mA ultra low dropout linear regulator

with a built in CMOS/TTL logic level enable, designed

specifically for battery powered applications where low

quiescent current and low dropout are critical for battery

longevity.

The SC112 uses a Semtech proprietary internal PNP

device for the pass element, providing a low dropout

voltage of 130mV at a load of 60mA.

The output noise is reduced to 30µV (typical) by placing a

very low leakage 10nF capacitor on pin 3 (noise bypass).

Each device contains a bandgap reference, error

amplifier, PNP pass element, thermal and current

limiting circuitry and resistor divider network for setting

output voltage.

The SC112 is packaged in a six lead SOT-23 surface

mount package for a very small footprint and it requires

only a 1µF capacitor on the output and a 0.01µF on the

bypass pin for a minimum number of external

components.

VIN

VO

EN

U1 SC112

1

2

3

4

5

6

EN

GND

BYP

VO

GND

VIN

C1

10nF

C2

1uF

C3

1uF

Description

Features

Applications

Typical Application Circuit

Notes:

(1) C

of 1.0µF or greater should be used. C

(2) C

between 10mW and 1W over temperature. Larger value capacitors will improve the overall transient response.

(3) C

recommended.

(4) EN may be tied to V

(5) Connect both ground pins (2 and 5) to ground to maximize heat conduction.