POWER MANAGEMENT

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SC560

Dual Output Low Noise LDO

Linear Regulator

© 2014 Semtech Corporation

Features

Input voltage range — 2.5V to 5.5V

Maximum output current — 300mA (both LDOs)

enabled)

Output noise < 50μV

xed output

versions)

PSRR < -65dB at 1kHz (SC560A and

xed output

versions)

Over-temperature protection

Short-circuit protection

Under-voltage lockout

Power good monitor for output A (SC560C and xed

output versions)

Independent enable/disable for LDOB (SC560B and

xed output versions)

MLPQ-UT8, 1.5mm x 1.5mm x 0.6mm package

Lead-free and halogen-free

Applications

PDAs and cellular phones

GPS devices

Palmtop computers and handheld instruments

TFT/LCD applications

Wireless handsets

Digital cordless phones and PCS phones

Personal communicators

Wireless LAN

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Description

The SC560 is a family of dual output, ultra-low dropout

linear voltage regulators designed for use in battery

powered wireless applications. The SC560A, SC560B, and

SC560C provide adjustable output voltages that can be

set using two external resistors. Fixed output voltages

are also available (see ordering information for available

combinations). Fixed output devices provide the power-

good monitor, independent enable pins, and a bypass pin

for low-noise operation

All members of the SC560 family require an input voltage

level between 2.5V and 5.5V. Output voltages for the

adjustable versions can vary between 1.2V and 5.0V. Fixed

output voltage options are also chosen from this range.

The SC560A provides superior low-noise performance

by using an external bypass capacitor connected to pin

7 to lter the bandgap reference. The SC560B uses pin 7

as a separate enable pin for the second regulator output

so the two outputs can be controlled independently.

The SC560C uses this pin to provide a PGOOD output

to hold a processor in reset when the voltage on OUTA

is not in regulation. All other versions provide all three

functions with xed output voltages (no feedback pins

are provided).

The device also provides protection circuitry such as

current limiting, under-voltage lockout, and thermal

protection to prevent device failures. Stability is

maintained by using 1µF capacitors on the output pins.

The MLPQ-UT8 package and 0402 ceramic capacitors

minimize the required PCB area.

2 .2 µF

OU T A

OU T B

VIN

EN B

EN

OU T B

EN

OU T A

GN D

EN B

PG O OD

B YP

VIN

SC560D

1 µF

1 µF

22 n F

PG O OD

Typical Application Circuit

Rev. 7.1