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General Description

The MAX1744/MAX1745 are step-down DC-DC con-

trollers capable of handling up to 36V inputs. These

parts use a proprietary current-limited control scheme

for excellent light- and full-load efficiency, while their

330kHz (max) switching frequency permits small exter-

nal components for space-critical applications.

Operation to 100% duty cycle permits the lowest possi-

ble dropout voltage.

The MAX1744 contains an internal feedback network

that provides a pin-selectable output voltage of either

3.3V or 5V. The MAX1745 uses an external feedback

network to generate an adjustable output voltage

between 1.25V and 18V.

The MAX1744/MAX1745 are available in a space-sav-

ing 10-pin µMAX package.

________________________Applications

Automotive Electronics

Telecom Systems

Wall-Cube-Powered Devices

Industrial Control Systems

Firewire/IEEE1394

____________________________Features

♦ High-Voltage Operation (up to 36V IN)

♦ Efficiency >90%

♦ Output Power Capability Exceeds 50W

♦ 10-Pin µMax Package

♦ Low-Dropout Voltage

♦ 100% (max) Duty Cycle

♦ 90µA Quiescent Current

♦ 4µA Shutdown Current

♦ Up to 330kHz Switching Frequency

♦ Output Voltage

5V or 3.3V (MAX1744)

Adjustable 1.25V to 18V (MAX1745)

♦ Current-Limited Control Scheme

MAX1744/MAX1745

High-Voltage, Step-Down DC-DC

Controller in µMAX

________________________________________________________________ Maxim Integrated Products 1

19-1776; Rev 1; 10/01

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX1744EUB -40°C to +85°C 10 µMAX

MAX1744AUB

-40°C to +125°C

10 µMAX

MAX1745EUB -40°C to +85°C 10 µMAX

MAX1745AUB

-40°C to +125°C

10 µMAX

GND

OUT

REF

MAX1744

3/5

3.3V

OFF

SHDN

IN VH

EXT

4.5V TO 36V

OUT

3.3V

OR 5V

Typical Operating Circuit

EXT

3/5 (FB)

( ) ARE FOR MAX1745 ONLY.

REF

GND

MAX1744

MAX1745

µMAX

TOP VIEW

CSOUT

SHDN

Pin Configuration

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.

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MAX1744/MAX1745 1
Controller in µMAX 1

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MAX1744/MAX1745High-Voltage, Step-Down DC-DC Controller in µMAXMaxim cannot assume responsibility for use of any circuitry other than circuitry entire

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Rainbow-electronics MAX1745 Manual do Utilizador

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