General Description

The MAX5082/MAX5083 are 250kHz PWM step-down

DC-DC converters with an on-chip, 0.3

Ω high-side

switch. The input voltage range is 4.5V to 40V for the

MAX5082 and 7.5V to 40V for the MAX5083. The output

is adjustable from 1.23V to 32V and can deliver up to

1.5A of load current.

Both devices utilize a voltage-mode control scheme for

good noise immunity in the high-voltage switching envi-

ronment and offer external compensation allowing for

maximum flexibility with a wide selection of inductor val-

ues and capacitor types. The switching frequency is

internally fixed at 250kHz and can be synchronized to

an external clock signal through the SYNC input. Light

load efficiency is improved by automatically switching

to a pulse-skip mode.

All devices include programmable undervoltage lock-

out and soft-start. Protection features include cycle-by-

cycle current limit, hiccup-mode output short-circuit

protection, and thermal shutdown. Both devices are

available in a space-saving, high-power (2.7W), 16-pin

TQFN package and are rated for operation over the

-40°C to +125°C temperature range.

Applications

Automotive

Distributed Power

Industrial

Features

♦ 4.5V to 40V (MAX5082) or 7.5V to 40V (MAX5083)

Input Voltage Range

♦ 1.5A Output Current

♦ Internal High-Side Switch

♦ Fixed 250kHz Internal Oscillator

♦ Automatic Switchover to Pulse-Skip Mode at

Light Loads

♦ External Frequency Synchronization

♦ Thermal Shutdown and Short-Circuit Protection

♦ Operates Over the -40°C to +125°C Temperature

Range

♦ Space-Saving (5mm x 5mm) High-Power 16-Pin

TQFN Package

1.5A, 40V, MAXPower Step-Down

DC-DC Converters

________________________________________________________________ Maxim Integrated Products

1

19-3657; Rev 0; 5/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX5082ATE

-40°C to +125°C

16 TQFN-EP*

MAX5083ATE

-40°C to +125°C

16 TQFN-EP*

MAX5082

4.5V TO 40V

ON/OFF

C1

R1

R2

C2

PGND

REG

LX

FB

IN

SYNC

SGND PGND

SS

COMP

DVREG

C-

PGND

D1

D2

L1

C8

C5

R6

R5

C+

BST

C7

C6

R3

R4

Typical Operating Circuits

FireWire is a registered trademark of Apple Computer, Inc.

Typical Operating Circuits continued at end of data sheet.

*EP = Exposed pad.

Pin Configurations appear at end of data sheet.