POWER MANAGEMENT

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SC2608

Simple, Synchronous

Voltage Mode PWM Controller

Features

Revision 4: October, 2005

The SC2608 is a versatile voltage-mode PWM controller

designed for use in step down DC/DC power supply appli-

cations. A simple, fixed frequency, highly efficient buck

regulator can be implemented using the SC2608 with mini-

mal external components. The input voltage range is from

+3.3V to +12V. Internal level shift and drive circuitry elimi-

nates the need for an expensive P-channel, high-side

MOSFET. The small device footprint allows for compact

circuit design.

SC2608 features include temperature compensated volt-

age reference, triangle wave oscillator, current limit com-

parator, and an externally compensated error amplifier.

Current limit is implemented by sensing the voltage drop

across the bottom MOSFET R

The SC2608 operates at a fixed frequency of 200kHz

providing an optimum compromise between efficiency ,

external component size, and cost.

SC2608 has a thermal protection circuit, which is

+3.3V or +5V or +12V input voltage

200kHz operation

High efficiency (>90%)

1% Reference voltage accuracy

Hiccup mode over current protection

Robust output drive

R

Industrial temperature range

SO-8 package

Integrated boot strap diode

Termination supplies

Low cost microprocessor supplies

Peripheral card supplies

Industrial power supplies

High density DC/DC conversion

Figure 1

Description

Applications

Typical Application Circuit

sense

VOUT

+12V

SC2608

COMP/SS

DL

GND

DH

BST

PHASE

VCC

SENSE

+12V/+5V/+3.3V

sense

Thermal Shut down

Fully WEEE and RoHS Compliant