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SC192

Synchronous Buck Converter

with Integrated Power Devices

POWER MANAGEMENT

Revision 8, March 26, 2007

Description

Features

Typical Application Circuit

Applications

The SC192 is a synchronous step-down converter with

integrated power devices designed for battery operated

systems. The internal power switches reduce system

size and cost. In addition, an efficiency of 95% can be

achieved for significant line and load ranges. The SC192

is designed for single-cell Li-Ion battery applications, but

also performs well in fixed 3.3V or 5V input circuits.

The SC192 has a flexible clocking scheme. It can be

synchronized to an external oscillator, fixed to the inter-

nal oscillator, or allowed to modulate the frequency dur-

ing light loads (PSAVE) for maximum battery life, by the

method called pulse frequency modulation (PFM). Shut-

down places the switches in a high impedance state and

turns off all control circuitry to achieve a typical quies-

cent current of 0.1μA.

Line and load regulation is to +/-0.5% of the output volt-

age. The internal MOSFET switches provide >1A peak

current to provide a DC output of at least 700mA.

Grounding the ILIM pin reduces the current limit by half.

The SC192 can achieve 100% duty cycle for excellent

low dropout performance and comes in a tiny MLPD-10,

3 x 3 package having a maximum height of 1mm.

2.7V to 7V Input Range

Output Adjustable from 0.75V to Vin

Fixed Frequency or PSAVE for Maximum

Efficiency Over Wide Load Current Range

700mA Guaranteed Output Current

No Schottky Diode Required

35μA Quiescent Current

100% Duty Cycle in Dropout

95% Efficiency

Fast Transient Response

Over Temperature Protection

Space-saving Micro Lead-Frame Package

MLPD-10 3x3

Cell Phones

Cordless Phones

Notebook and Subnotebook Computers

PDAs and Mobile Communicators

1 Li-Ion or 3 NiMH/NiCd Powered Devices

VIN

EN

ILIM

BP

GND

COMP

SYNC/PWM

PGND

ADJ

LX

SC192

Vin = 2.7V to 7V

C1

C3

L1

C5

R1

R2

C6

R8

C4

Vout = 0.75V to Vin

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8

6

2

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7

10

5

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