MAX5075A MAXIM [Maxim Integrated Products], MAX5075A Datasheet

MAX5075A

Manufacturer Part Number

MAX5075A

Description

Push-Pull FET Driver with Integrated Oscillator and Clock Output

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX5075A.pdf (8 pages)

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Download datasheet (235Kb)

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

µMAX

+125°C operating temperature range.

Current-Fed, High-Efficiency Power-Supply Modules

Power-Supply Building Subsystems

Push-Pull Driver Subsystems

19-3662; Rev 0; 5/05

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

Pin Configuration appears at end of data sheet.

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.

Push-Pull FET Driver with Integrated Oscillator

GND

package and is specified over the -40°C to

CONTROLLER

GND

PWM

SYNCIN

________________________________________________________________ Maxim Integrated Products

DRVH

DRVL

General Description

Applications

DGND

CLK

MAX5075

I.C.

NDRV2

NDRV1

PGND

♦ 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

♦ Synchronizing Clock Frequency Generation

♦ Thermally Enhanced 8-Pin µMAX Package

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

*EP = Exposed paddle.

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

temperature range.

MAX5075AAUA 8 µMAX-EP* AAAU

MAX5075BAUA 8 µMAX-EP*

MAX5075CAUA 8 µMAX-EP* AAAW

Capacitive Load

Options

PART

and Clock Output

Typical Operating Circuit

PIN-

PACKAGE

Ordering Information

MARK

AAAV

TOP

CODE

U8E-2

PKG

Features

CLK

RATIO

OUT

NDRV_

Related parts for MAX5075A

MAX5075A Summary of contents

Page 1

... Synchronizing Clock Frequency Generation Options ♦ Thermally Enhanced 8-Pin µMAX Package ♦ -40°C to +125°C Operating Temperature Range PART Applications MAX5075AAUA 8 µMAX-EP* AAAU MAX5075BAUA 8 µMAX-EP* MAX5075CAUA 8 µMAX-EP* AAAW *EP = Exposed paddle. Note: All devices specified for -40°C to +125°C operating temperature range. ...

Page 2

Push-Pull FET Driver with Integrated Oscillator and Clock Output ABSOLUTE MAXIMUM RATINGS V to DGND, PGND .............................................-0.3V to +18V CC CLK DGND.....................................................-0.3V to +6V NDRV1, NDRV2 to PGND...........................-0. DGND to PGND.....................................................-0.3V to +0.3V CLK Current......................................................................±20mA NDRV1, ...

Page 3

Push-Pull FET Driver with Integrated Oscillator (V = +12V 124kΩ, NDRV_ = open, CLK = open SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.25MHz OSC 500kHz OSC ...

Page 4

... CLK FREQUENCY (kHz) MAX5075C WAVEFORM MAX5075 toc12 R = 124kΩ RT NDRV1 5V/div NDRV2 5V/div CLK 5V/div 4µs/div MAX5075A WAVEFORM MAX5075 toc11 R = 124kΩ RT NDRV1 5V/div NDRV2 5V/div CLK 5V/div 2µs/div MAX5075 toc13 R = 124kΩ RT NDRV1 5V/div ...

Page 5

Push-Pull FET Driver with Integrated Oscillator PIN NAME Synchronizing Clock Output. Clock output with a ±10mA peak current drive that can be used to 1 CLK synchronize an external PWM regulator. CLK/NDRV1 frequency has a 1x, 2x ratio. ...

Page 6

... The MAX5075 has internal CLK output frequency to NDRV1 and NDRV2 switching frequency ratios set to 1x, 2x (Table 1). The MAX5075A has a CLK frequency to NDRV_ frequen- cy ratio set to 1x. The MAX5075B has a CLK frequency to NDRV_ frequency ratio set to 2x and the MAX5075C has a CLK frequency to NDRV_ frequency ratio set to 4x ...

Page 7

Push-Pull FET Driver with Integrated Oscillator Power Dissipation The power dissipation of the MAX5075 is a function of the sum of the quiescent current and the output current (either capacitive or resistive load). Maintain the sum of the currents so ...

Page 8

Push-Pull FET Driver with Integrated Oscillator and Clock Output (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any ...

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