MAX5081 Maxim Integrated Products, MAX5081 Datasheet

MAX5081

Manufacturer Part Number

MAX5081

Description

1A / 40V / MAXPower Step-Down DC-DC Converters

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5081.pdf (19 pages)

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Part Number:

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The MAX5080/MAX5081 are 250kHz PWM step-down

DC-DC converters with an on-chip, 0.3Ω high-side

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

MAX5080 and 7.5V to 40V for the MAX5081. The output

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

1A 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.

19-3656; Rev 1; 2/07

FireWire is a registered trademark of Apple Computer, Inc.

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.

Typical Operating Circuits continued at end of data sheet.

FireWire

Distributed Power

Power Supplies

________________________________________________________________ Maxim Integrated Products

4.5V TO 40V

PGND

General Description

Applications

Automotive

Industrial

1A, 40V, MAXPower Step-Down

ON/OFF

REG

SYNC SGND PGND

DVREG

MAX5080

C-

♦ 4.5V to 40V (MAX5080) or 7.5V to 40V (MAX5081)

♦ 1A Output Current

♦ V

♦ Internal High-Side Switch

♦ Fixed 250kHz Internal Oscillator

♦ Automatic Switchover to Pulse-Skip Mode at

♦ External Frequency Synchronization

♦ Thermal Shutdown and Short-Circuit Protection

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

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

*EP = Exposed pad.

Pin Configurations appear at end of data sheet.

MAX5080ATE

MAX5081ATE

Input Voltage Range

Light Loads

Range

TQFN Package

OUT

C+

PART

Range From 1.23V to 32V

BST

COMP

DC-DC Converters

Typical Operating Circuits

-40°C to +125°C

TEMP RANGE

Ordering Information

BST

PIN-

PACKAGE

16 TQFN-EP*

www.DataSheet4U.com

Features

T1655-2

PGND

CODE

OUT

PKG

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