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SC5205

150mA Ultra Low Dropout, Low

Noise Micropower Linear Regulator

POWER MANAGEMENT

PRELIMINARY

Revision 1, January 2001

The SC5205 is a 150mA 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 SC5205 uses a Semtech proprietary internal PNP

device for the pass element, providing a low dropout

voltage of 165mV at a load of 150mA, while maintaining

a ground pin current of 2750µA.

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 SC5205 is packaged in a 5 pin 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 amount of external components.

EN

VIN

VO

+

C1

1uF

U1

SC5205

1

2

3

4

5

VIN

GND

EN

BYP

VO

+

C3

1uF

C2

10nF

Description

Features

Applications

Typical Application Circuit

Notes:

(1) C

of 1.0µF or greater should be used. C

(2) C

improve the overall transient response.

(3) C

recommended.

(4) EN may be tied to V