General Description

The MAX5069 is a high-frequency, current-mode,

pulse-width modulation (PWM) controller (with dual

MOSFET drivers) that integrates all the building blocks

necessary for implementing AC-DC or DC-DC fixed-fre-

quency power supplies. Isolated or nonisolated push-

pull and half/full-bridge power supplies are easily

constructed using either primary- or secondary-side

regulation. Current-mode control with leading-edge

blanking simplifies control-loop design and a program-

mable internal slope-compensation circuit stabilizes the

current loop when operating at duty cycles above 50%.

An input undervoltage lockout (UVLO) programs the

input-supply startup voltage and ensures proper opera-

tion during brownout conditions.

A single external resistor programs the oscillator frequen-

cy from 50kHz to 2.5MHz. The MAX5069A/D provide a

SYNC input for synchronization to an external clock. The

maximum FET-driver duty cycle for the MAX5069 is 50%.

Programmable dead time allows additional flexibility in

optimizing magnetic design and overcoming parasitic

effects. Programmable hiccup current limit provides

additional protection under severe faults.

The MAX5069 is specified over the -40°C to +125°C auto-

motive temperature range and is available in a

16-pin thermally enhanced TSSOP-EP package. Refer to

the MAX5068 data sheet for single FET-driver applications.

Warning: The MAX5069 is designed to work with high

voltages. Exercise caution.

Applications

Universal-Input AC Power Supplies

Isolated Telecom Power Supplies

Networking System Power Supplies

Server Power Supplies

Industrial Power Conversion

Features

♦ Current-Mode Control with 47µA (typ) Startup

Current

♦ Oscillator Frequency Programmable to 2.5MHz

♦ Resistor-Programmable ±4.5% Accurate

Switching Frequency

♦ Dual Gate-Drive Output for Half/Full-Bridge or

Push-Pull Applications

♦ Rectified 85VAC to 265VAC, or 36VDC to 72VDC

Input (MAX5069A/B)

♦ Input Directly Driven from 10.8V to 24V

(MAX5069C/D)

♦ Programmable Dead Time and Slope

Compensation

♦ Programmable Startup Voltage (UVLO)

♦ Programmable UVLO Hysteresis (MAX5069B/C)

♦ Frequency Synchronization Input (MAX5069A/D)

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

♦ 16-Pin Thermally Enhanced TSSOP-EP Package

High-Frequency, Current-Mode PWM Controller

with Accurate Oscillator and Dual FET Drivers

________________________________________________________________ Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

RT

REG5

IN

NDRVA

NDRVB

PGND

AGND

CS

TOP VIEW

MAX5069

TSSOP-EP

SYNC(HYST*)

SCOMP

FB

DT

UVLO/EN

COMP

FLTINT

*MAX5069B/C.

Pin Configuration

Ordering Information

19-3175; Rev 1; 7/04

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.

*EP = Exposed pad.

PART

TEMP RANGE

PIN-PACKAGE

MAX5069AAUE

-40°C to +125°C

16 TSSOP-EP*

MAX5069BAUE

-40°C to +125°C

16 TSSOP-EP*

MAX5069CAUE

-40°C to +125°C

16 TSSOP-EP*

MAX5069DAUE

-40°C to +125°C

16 TSSOP-EP*

Selector Guide appears at end of data sheet.