REJ03D0841-0300 Rev.3.00 Jun 15, 2007

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M5291P/FP

DC/DC Converter

REJ03D0841-0300

Rev.3.00

Jun 15, 2007

Description

M5291 is a semiconductor integrated circuit which is designed for switching regulator control. The device consists of a

comparator, controlled pulse width oscillator (with peak current protection circuit), temperature compensated reference,

and high current output switch.

Especially, this IC was designed for Step-Down and Step-Up and Voltage-Inverting applications.

Features

• Wide supply voltage range: 2.5 to 40 V

• Low dissipation current: 1.4 mA

• Wide range of output

Voltage adjust: 1.17 to 40 V

• Output switch current: 200 mA

• Wide range of switching frequency: 100 Hz to 100 kHz

• Built-in peak current protection circuit

Application

General power supply system

Block Diagram

+

−

1

2

3

4

5

6

7

8

QS

R

Oscillator

1.17 V

Reference

Comparator

Comparator

input

Peak current

sense

Driver

Switch

collector

Switch

emitter

Timing

capacitor

Ground