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SC196A

1.5A Synchronous Buck Converter

with Integrated Power Devices

POWER MANAGEMENT

July 14, 2008

Typical Application Circuit

Applications

The SC196A is a synchronous step-down converter with

integrated power devices. The SC196A is designed for

single-cell Li-Ion battery applications but can also be used

in fixed 3.3V or 5V applications. The switching frequency

is nominally set to 1MHz, allowing the use of small

inductors and capacitors. The maximum current rating of

the internal MOSFET switches allows a DC output current

of 1.5A.

Four programable output voltages 1.00V/1.05V/1.20V/

1.80V are available. See SC196 with external feedback

for other output voltage settings.

The SC196A has a flexible clocking methodology that

allows it to be synchronized to an external oscillator or

controlled by the internal oscillator. The device can

operate in either forced PWM mode or in PSAVE mode. If

PSAVE mode is enabled, the part will automatically enter

PFM at light loads to maintain maximum efficiency across

the full load range.

For noise sensitive applications, PSAVE mode can be

disabled by synchronizing to an external oscillator or

pulling the SYNC/PWM pin high. Shutdown turns off all

the control circuitry to achieve a typical shutdown current

of 0.1μA.

Cell phones

Wireless communication chipset power

Personal media player

Notebook and sub-notebook computers

PDAs and mobile communicators

WLAN peripherals

Up to 93% efficiency

1.00V/1.05V/1.20V/1.80V selectable output voltage

Output current — 1.5A

Quiescent current — 17μA

Input range — 2.7V to 5.5V

Dynamic voltage positioning capability

Fixed 1MHz frequency or 750kHz to 1.25MHz

synchronized operation

PSAVE operation to maximize efficiency at light loads

Minimal external components

Fast transient response

100% duty cycle in dropout

Soft-start

Over-temperature and short-circuit protection

Space-saving lead-free package — MLP-10, 3 x 3mm

Description

Features

SC196A

VIN

LX

EN

SYNC/PWM

VOUT

VID0

VID1

PGND

MODE

GND

L1

10μF

10μF

4.7μH

2.7V to 5.5V

1.05V

1.5A