© 2011 Semtech Corporation

POWER MANAGEMENT

1

SC202A

3.5MHz, 500mA Step-down Regulator

With Integrated Inductor

and Digital Programmable Output

Features

Input Voltage — 2.9V to 5.5V

Output Voltage — 0.8V to 3.3V

Output current capability — 500mA

Internal inductor

Programmable output voltages — 15

High light-load efficiency via automatic PSAVE mode

Fast transient response

Temperature range — -40 to +85°C

Oscillator frequency — 3.5MHz

100% duty cycle capability

Quiescent current — 38µA typical

Shutdown current — 0.1µA typical

Internal soft-start

Over-voltage protection

Current limit and short circuit protection

Over-temperature protection

Under-voltage lockout

Floating control pin protection

MLPQ-13 — 2.5 x 3.0 x 1.0 (mm) package

Lead-free and halogen-free

WEEE and RoHS compliant

Applications

Point of load regulation

Smart phones and cellular phones

MP3/personal media players

Personal navigation devices

Digital cameras

Single Li-ion cell or 3 NiMH/NiCd cell devices

Devices with 3.3V or 5V internal power rails

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Description

The SC202A is a high efficiency 500mA step-down regula-

tor that includes an integrated inductor inside the

package. The input voltage range makes it ideal for

battery operated applications with space limitations. The

SC202A also includes 15 programmable output voltage

settings that can be selected using the four control pins,

eliminating the need for external feedback resistors. The

output voltage can be fixed to a single setting or dynami-

cally switched between different levels. Pulling all four

control pins low disables the output.

The SC202A operates at a fixed 3.5MHz switching fre-

quency in normal PWM (Pulse-Width Modulation) mode.

A variable frequency PSAVE (power-save) mode is used to

optimize efficiency at light loads for each output setting.

Built-in hysteresis prevents chattering between the two

modes.

The SC202A provides several protection features. These

include short circuit protection, over-temperature protec-

tion, under-voltage lockout, and soft-start to control

in-rush current. These features, coupled with the small

2.5 x 3.0 x 1.0 (mm) package, make the SC202A a versatile

device ideal for step-down regulation in products needing

high efficiency and a small PCB footprint.

SC202A

IN

CTL3

CTL2

CTL1

CTL0

SNS

OUT

GND

0.8V to 3.3V

2.9V to 5.5V

10µF

4.7µF

Control Logic

Lines

LX

NC

Typical Application Circuit

Rev. 1.2