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General Description

The MAX5042/MAX5043 isolated multimode PWM power

ICs feature integrated switching power MOSFETs con-

nected in a voltage-clamped, two-transistor, power-circuit

configuration. These devices operate from a wide 20V to

76V input voltage range. The MAX5042 includes a hot-

swap controller for use with an external power MOSFET to

limit inrush current for applications where the power sup-

ply is plugged into a live power backplane. The MAX5043

does not include a hot-swap controller.

The voltage-clamped power topology of the MAX5042/

MAX5043 enables full recovery of stored magnetizing

and leakage inductive energy for enhanced efficiency

and reliability. Operating at up to 500kHz switching fre-

quency, these devices provide up to 50W of output

power. The MAX5042/MAX5043 allow the implementa-

tion of both forward and flyback voltage or current-mode

converter topologies. A dedicated latched external shut-

down provides protection in addition to internal thermal

shutdown.

The MAX5042/MAX5043 achieve higher efficiency when

used with secondary-side synchronous rectification.

These devices generate a look-ahead signal for driving

secondary-side synchronous rectifiers.

The MAX5042/MAX5043 are rated for operation over the

-40°C to +125°C temperature range and are available in

a small surface-mount 56-pin thin QFN package.

Warning: The MAX5042/MAX5043 are designed to

work with high voltages. Exercise caution.

Applications

High-Efficiency Telecom/Datacom Power

Supplies

Router/Switch Cards with 48V Backplane Power

Systems

Servers with 48V Backplane Power Systems

xDSL Line Cards

xDSL Line-Driver Power Supplies

Distributed Power Systems with 48V Bus

42V Automotive Power Supplies

Power-Supply Modules

Features

♦ Reliable Single-Stage Clamped Two-Switch Power

ICs for High Efficiency

♦ No Reset Winding Required

♦ Up to 50W Output Power

♦ Integrated High-Voltage 75mΩ Power MOSFETs

♦ 20V to 76V Wide Input Voltage Range

♦ Feed-Forward Voltage or Current-Mode Control

♦ Programmable Brownout Undervoltage Lockout

♦ Integrated Current Signal Amplifier for High-

Efficiency, Current-Mode Control

♦ Internal Overtemperature Shutdown

♦ Indefinite Short-Circuit Protection

♦ Integrated Thermally Protected High-Voltage

Startup Linear Regulator

♦ Integrated Hot-Swap Controller (MAX5042)

♦ Integrated Look-Ahead Signal Output Drives

High-Speed Optocoupler for Secondary-Side

Synchronous Rectification

♦ >90% Efficiency with Synchronous Rectification

♦ Up to 500kHz Switching Frequency

♦ High-Power (2.5W), Small-Footprint 56-Pin

Thermally Enhanced QFN Package

MAX5042/MAX5043

Two-Switch Power ICs with Integrated

Power MOSFETs and Hot-Swap Controller

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3046; Rev 0; 1/04

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.

Pin Configurations appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX5042ATN -40°C to +125°C 56 Thin QFN

MAX5043ATN* -40°C to +125°C 56 Thin QFN

Selector Guide

PART DESCRIPTION

MAX5042

Two-Switch Power IC with Integrated Power

MOSFETs and Hot-Swap Controller for Isolated

Power Supplies

MAX5043

Two-Switch Power IC with Integrated Power

MOSFETs for Isolated Power Supplies

EVALUATION KIT

AVAILABLE

*Future product—contact factory for availability.

1 2 3 4 5 6 ... 21 22

Resumo do Conteúdo

Página 1 - MAX5042/MAX5043

General DescriptionThe MAX5042/MAX5043 isolated multimode PWM powerICs feature integrated switching power MOSFETs con-nected in a voltage-clamped, two

Página 2

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller10 ___________________________________________________________

Página 3

______________________________________________________________________________________ 11MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSF

Página 4

MAX5042/MAX5043Detailed DescriptionThe MAX5042/MAX5043 PWM multimode power ICsare designed for the primary side of voltage or current-mode isolated, f

Página 5

Set the switching frequency with a resistor and acapacitor at RCOSC. Switching at 250kHz ensuresswitching losses are minimal and external power pas-si

Página 6

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller14 ___________________________________________________________

Página 7

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller______________________________________________________________

Página 8

MAX5042/MAX5043where RHeis the external high-side resistor, RLeis theexternal low-side resistor, RHiis the internal high-sideresistor (1.2MΩ, typ), RL

Página 9

Maximize the signal-to-noise ratio by setting the ramppeak as high as possible. Calculate the low-frequency,small-signal gain of the power stage (the

Página 10

MAX5042/MAX5043where IFLTINT= 80µA,tshis the desired ignore time during which current-limitevents from the current-limit comparator are ignored.Some t

Página 11

Determining Hot-Swap Inrush CurrentCalculate the hot-swap inrush current using the follow-ing formula:where:CIN= the load capacitance,SHSLRis the MAX5

Página 12

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller2 ____________________________________________________________

Página 13

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller20 ___________________________________________________________

Página 14

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller______________________________________________________________

Página 15

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap ControllerMaxim cannot assume responsibility for use of any circuitry ot

Página 16

_______________________________________________________________________________________ 3MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSF

Página 17

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller4 ____________________________________________________________

Página 18

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller______________________________________________________________

Página 19

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller6 ____________________________________________________________

Página 20

_______________________________________________________________________________________ 7MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSF

Página 21 - Pin Configurations

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap Controller8 ____________________________________________________________

Página 22 - 56L THIN QFN.EPS

MAX5042/MAX5043Two-Switch Power ICs with IntegratedPower MOSFETs and Hot-Swap ControllerCURRENT-LIMIT THRESHOLDvs. TEMPERATUREMAX5042 toc18TEMPERATURE

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