_______________General Description

The MAX742 DC-DC converter is a controller for dual-out-

put power supplies in the 3W to 60W range. Relying on

simple two-terminal inductors rather than transformers, the

MAX742 regulates both outputs independently to within

±4% over all conditions of line voltage, temperature, and

load current.

The MAX742 has high efficiency (up to 92%) over a wide

range of output loading. Two independent PWM current-

mode feedback loops provide tight regulation and opera-

tion free from subharmonic noise. The MAX742 can

operate at 100kHz or 200kHz, so it can be used with small

and lightweight external components. Also ripple and

noise are easy to filter. The MAX742 provides a regulated

output for inputs ranging from 4.2V to 10V (and higher with

additional components).

External power MOSFETs driven directly from the MAX742

are protected by cycle-by-cycle overcurrent sensing. The

MAX742 also features undervoltage lockout, thermal shut-

down, and programmable soft-start.

If 3W of load power or less is needed, refer to the MAX743

data sheet for a device with internal power MOSFETs.

________________________Applications

DC-DC Converter Module Replacement

Distributed Power Systems

Computer Peripherals

____________________________Features

o Specs Guaranteed for In-Circuit Performance

o Load Currents to ±2A

o 4.2V to 10V Input-Voltage Range

o Switches From ±15V to ±12V Under Logic Control

o ±4% Output Tolerance Max Over Temp, Line,

and Load

o 90% Typ Efficiency

o Low-Noise, Current-Mode Feedback

o Cycle-by-Cycle Current Limiting

o Undervoltage Lockout and Soft-Start

o 100kHz or 200kHz Operation

Switch-Mode Regulator with

+5V to ±12V or ±15V Dual Output

________________________________________________________________

Maxim Integrated Products

1

MAX742

P

R

+5V

INPUT

S

-SENSE

-DRIVE

PWM

N

R

S

+SENSE

+DRIVE

-VO

+VO

PWM

OSC

+2.0V

VREF

CC+

CC-

__________Simplified Block Diagram

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

CSH+

CSL+

GND

EXT+

AV

AGND

CC+

FB+

TOP VIEW

PUMP

PDRV

EXT-

V+

SS

VREF

12/15

100/200

12

11

9

10

CSH-

CSL-

FB-

CC-

DIP/SO

MAX742

__________________Pin Configuration

19-3105; Rev 2; 8/96

PART

MAX742CPP

MAX742CWP

MAX742C/D

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

20 Plastic DIP

20 Wide SO

Dice*

EVALUATION

KIT MANUAL

FOLLOWS

DATA

SHEET

MAX742EWP

MAX742MJP

-55°C to +125°C

-40°C to +85°C

20 Wide SO

20 CERDIP

MAX742EPP

-40°C to +85°C

20 Plastic DIP

______________Ordering Information

* Contact factory for dice specifications

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800