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SC2982

50mA Ultra Low Dropout, Low

Noise Micropower Linear Regulator

POWER MANAGEMENT

PRELIMINARY

Revision 1, January 2001

The SC2982 is a 50mA ultra low dropout linear

regulator with a built in CMOS/TTL logic level enable

switch. It is designed specifically for battery powered

applications where low quiescent current and low

dropout are critical for battery longevity.

The SC2982 uses a Semtech proprietary internal PNP

device for the pass element, providing a low dropout

voltage of 100mV at a load of 50mA, while maintaining a

ground pin current of 600µA.

The output noise is reduced by placing a 10nF capacitor

on pin 4 (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 SC2982 is packaged in a 5 pin SOT-23 surface mount

package for a very small footprint and requires only a

1µF capacitor on the output for a minimum number of

external components.

EN

VIN

VO

+

C

1uF

U1

SC2982

1

2

3

4

5

VIN

GND

EN

BYP

VO

+

Co

1uF

C

10nF

IN

BYP

Description

Features

Applications

Typical Application Circuit

Notes:

(1) C

or greater should be used. C

(2) C

the overall transient response. Due to their very low ESR, ceramic capacitors should not be used.

(3) C

(4) EN should be tied to VIN if the shutdown feature is not required. Maximum EN voltage = VIN.