General Description

The MAX5035 easy-to-use, high-efficiency, high-volt-

age, step-down DC-DC converter operates from an

input voltage up to 76V and consumes only 270µA qui-

escent current at no load. This pulse-width modulated

(PWM) converter operates at a fixed 125kHz switching

frequency at heavy loads, and automatically switches

to pulse-skipping mode to provide low quiescent cur-

rent and high efficiency at light loads. The MAX5035

includes internal frequency compensation simplifying

circuit implementation. The device uses an internal low-

on-resistance, high-voltage, DMOS transistor to obtain

high efficiency and reduce overall system cost. This

device includes undervoltage lockout, cycle-by-cycle

current limit, hiccup mode output short-circuit protec-

tion, and thermal shutdown.

The MAX5035 delivers up to 1A output current. The out-

put current may be limited by the maximum power dis-

sipation capability of the package. External shutdown is

included, featuring 10µA (typ) shutdown current. The

MAX5035A/B/C versions have fixed output voltages of

3.3V, 5V, and 12V, respectively, while the MAX5035D

features an adjustable output voltage from 1.25V to

13.2V.

The MAX5035 is available in space-saving 8-pin SO

and 8-pin plastic DIP packages and operates over the

automotive (-40°C to +125°C) temperature range.

Applications

Automotive

Consumer Electronics

Industrial

Distributed Power

Features

♦ Wide 7.5V to 76V Input Voltage Range

♦ Fixed (3.3V, 5V, 12V) and Adjustable

(1.25V to 13.2V) Versions

♦ 1A Output Current

♦ Efficiency Up to 94%

♦ Internal 0.4Ω High-Side DMOS FET

♦ 270µA Quiescent Current at No Load, 10µA

Shutdown Current

♦ Internal Frequency Compensation

♦ Fixed 125kHz Switching Frequency

♦ Thermal Shutdown and Short-Circuit Current

Limit

♦ 8-Pin SO and PDIP Packages

1A, 76V, High-Efficiency MAXPower

Step-Down DC-DC Converter

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-2988; Rev 3; 5/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-

PACKAGE

OUTPUT

VOLTAGE

(V)

MAX5035AUSA

0°C to +85°C

8 SO

MAX5035AUPA

0°C to +85°C

8 PDIP

MAX5035AASA

-40°C to +125°C 8 SO

MAX5035AASA/V+

-40°C to +125°C 8 SO

3.3

MAX5035BUSA

0°C to +85°C

8 SO

MAX5035BUPA

0°C to +85°C

8 PDIP

MAX5035BASA

-40°C to +125°C 8 SO

MAX5035BASA/V+

-40°C to +125°C 8 SO

5.0

1

2

3

4

BST

VD

SGND

FB

8

7

6

5

LX

TOP VIEW

GND

ON/OFF

MAX5035

SO/PDIP

Pin Configuration

MAX5035

GND

BST

LX

SGND

FB

D1

50SQ100

VD

100

μH

5V

7.5V TO 76V

68

μF

0.1

μF

0.1

μF

68

μF

ON

OFF

R1

R2

ON/OFF

Typical Operating Circuit

+

Denotes lead(Pb)-free/RoHS-compliant package.

Ordering Information continued at end of data sheet.