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General Description

The MAX5003 high-voltage switching power-supply

controller has all the features and building blocks need-

ed for a cost-effective flyback and forward voltage-

mode control converter. This device can be used to

design both isolated and nonisolated power supplies

with multiple output voltages that operate from a wide

range of voltage sources. It includes a high-voltage

internal start-up circuit that operates from a wide 11V to

110V input range. The MAX5003 drives an external N-

channel power MOSFET and has a current-sense pin

that detects overcurrent conditions and turns off the

power switch when the current-limit threshold is

exceeded. The choice of external power MOSFET and

other external components determines output voltage

and power.

The MAX5003 offers some distinctive advantages: soft-

start, undervoltage lockout, external frequency synchro-

nization, and fast input voltage feed-forward. The

device is designed to operate at up to 300kHz switch-

ing frequency. This allows use of miniature magnetic

components and low-profile capacitors. Undervoltage

lockout, soft-start, switching frequency, maximum duty

cycle, and overcurrent protection limit are all adjustable

using a minimum number of external components. In

systems with multiple controllers, the MAX5003 can be

externally synchronized to operate from a common sys-

tem clock.

Warning: The MAX5003 is designed to operate with

high voltages. Exercise caution.

The MAX5003 is available in 16-pin SO and QSOP pack-

ages. An evaluation kit (MAX5003EVKIT) is also available.

Applications

Telecommunication Power Supplies

ISDN Power Supplies

+42V Automobile Systems

High-Voltage Power-Supply Modules

Industrial Power Supplies

Features

o Wide Input Range: 11V to 110V

o Internal High-Voltage Startup Circuit

o Externally Adjustable Settings

Output Switch Current Limit

Oscillator Frequency

Soft-Start

Undervoltage Lockout

Maximum Duty Cycle

o Low External Component Count

o External Frequency Synchronization

o Primary or Secondary Regulation

o Input Feed-Forward for Fast Line-Transient

Response

o Precision ±2.5% Reference over Rated

Temperature Range

High-Voltage PWM

Power-Supply Controller

________________________________________________________________ Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

V+

NDRV

PGND

CS

AGND

MAXTON

FB

TOP VIEW

MAX5003

QSOP/Narrow SO

INDIV

ES

REF

FREQ

SS

CON

COMP

19-1555; Rev 0; 12/99

PART

MAX5003CEE

MAX5003CSE

MAX5003EEE

-40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 QSOP

16 Narrow SO

16 QSOP

EVALUATION

KIT

AVAILABLE

Note A: Dice are designed to operate over a -40°C to +140°C

Pin Configuration

Ordering Information

MAX5003ESE

-40°C to +85°C

16 Narrow SO

MAX5003C/D

(Note A)

Dice