11/07/08 SP7656 PowerBlox



Copyright 2008 EXAR Corporation

1

FEATURES



Wide Input Voltage Range 4.5V – 29V



3 Amps Continuous 4 Amps Peak Output Current



Internal Compensation



Input Feedforward Control improves

Transient and Regulation



600kHz Constant Frequency Operation



Low 0.6V Reference Voltage



High output setpoint accuracy of 1%



Internal Soft Start



Small SO8-EP Thermally Enhanced Package



Adjustable Overcurrent Protection



Lead Free, RoHS Compliant Package

DESCRIPTION

The SP7656 is a PWM controlled step down (buck) voltage mode regulator co-packaged with a P-

Channel FET. It operates from 4.5V to 29V making it suitable for 5V, 12V and 24V applications. The

programmable overcurrent protection is based on internal FET resistance sensing and allows setting

the overcurrent protection value up to a 300mV threshold (measured between VIN-LX). The SP7656

is packaged in a thermally enhanced 8-pin SO8 package making it one of the smallest converters

available capable of operating from 5, 9, 12, 18 and 24VDC supplies.

TYPICAL APPLICATION CIRCUIT

3A, 29V Non-Synchronous Buck Converter

SP7656 PowerBlox