General Description

The MAX5075 is a +4.5V to +15V push-pull, current-fed

topology driver subsystem with an integrated oscillator

for use in telecom module power supplies. The device

drives two MOSFETs connected to a center-tapped

transformer primary providing secondary-side, isolated,

negative or positive voltages. This device features a pro-

grammable, accurate, integrated oscillator with a syn-

chronizing clock output that synchronizes an external

PWM regulator. A single external resistor programs the

internal oscillator frequency from 50kHz to 1.5MHz.

The MAX5075 incorporates a dual MOSFET driver with

±3A peak drive currents and 50% duty cycle. The

MOSFET driver generates complementary signals to

drive external ground-referenced n-channel MOSFETs.

The MAX5075 is available with a clock output frequency

to MOSFET driver frequency ratio of 1x, 2x, and 4x. The

MAX5075 is available in a thermally enhanced 8-pin

+125°C operating temperature range.

Applications

Current-Fed, High-Efficiency Power-Supply Modules

Power-Supply Building Subsystems

Push-Pull Driver Subsystems

Features

♦ Current-Fed, Push-Pull Driver Subsystem

♦ Programmable, Accurate Internal Oscillator

♦ Single +4.5V to +15V Supply Voltage Range

♦ Dual ±3A Gate-Drive Outputs

♦ 1mA Operating Current at 250kHz with No

Capacitive Load

♦ Synchronizing Clock Frequency Generation

Options

♦ Thermally Enhanced 8-Pin µMAX Package

♦ -40°C to +125°C Operating Temperature Range

Push-Pull FET Driver with Integrated Oscillator

and Clock Output

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3662; Rev 1; 5/07

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.

Pin Configuration appears at end of data sheet.

PART

PIN-

PACKAGE

TOP

MARK

PKG

CODE

RATIO

MAX5075AAUA 8 µMAX-EP*

AAAU

U8E-2

1

MAX5075BAUA 8 µMAX-EP*

AAAV

U8E-2

2

MAX5075CAUA 8 µMAX-EP*

AAAW

U8E-2

4

*EP = Exposed paddle.

Note: All devices specified for -40°C to +125°C operating

temperature range.

MAX5075

1nF

4.7kΩ

NDRV2

DRVH

DRVL

GND

GND

PWM

CONTROLLER

SYNCIN

NDRV1

RT

PGND

I.C.

CLK

Typical Operating Circuit

µMAX is a registered trademark of Maxim Integrated Products, Inc.