+72V, SOT23/TDFN, Simple Swapper Hot-Swap

Controllers

________________________________________________________________ Maxim Integrated Products

1

19-1988; Rev 3; 1/07

General Description

The MAX5902/MAX5903 are hot-swap controllers that

allow a circuit card to be safely hot plugged into a live

backplane without causing a glitch on the power-sup-

ply rail. These devices operate from +9V to +72V and

provide the simplest hot-swap solution by eliminating all

external components except the external p-channel

MOSFET.

The MAX5902/MAX5903 limit the inrush current to the

load and provide a circuit-breaker function for overcurrent

protection. During startup the circuit-breaker function is

disabled and the MAX5902/MAX5903 limit the inrush cur-

rent by gradually turning on the external MOSFET. Once

the external MOSFET is fully enhanced, the circuit-break-

er function is enabled and the MAX5902/MAX5903 pro-

vide overcurrent protection by monitoring the voltage

drop across the external MOSFET’s on-resistance.

The MAX5902/MAX5903 include an undervoltage lock-

out (UVLO) function, ON/OFF control input, and a

power-good status output, PGOOD (MAX5902) or

PGOOD (MAX5903). A built-in thermal shutdown fea-

ture is also included to protect the external MOSFET in

case of overheating.

The MAX5902/MAX5903 offer latched or autoretry fault

management and are available with 300mV, 400mV or

500mV circuit-breaker thresholds. Both the MAX5902 and

MAX5903 are available in small SOT23 and TDFN pack-

ages, and are specified for the extended -40°C to +85°C

temperature range. For specific ordering information, see

the Selector Guide at the end of the data sheet.

Applications

Network Routers

Servers

Network Switches

RAID

Base Station Line

Industrial Systems

Cards

Features

♦ Wide +9V to +72V Operation

♦ Requires No External Sense Resistor

♦ Drives External p-Channel MOSFET

♦ Limits Inrush Current

♦ Circuit-Breaker Function

♦ Less than 2mA Quiescent Current

♦ ON/OFF Input Permits Load Power-Supply

Control and Sequencing

♦ Adjustable Undervoltage Lockout

♦ Power-Good Output with +72V Rating

♦ Latching or Automatic Retry Fault Management

♦ Thermal Shutdown Helps Protect the External

MOSFET

♦ Available in Two Small Packages

6-Pin TDFN and SOT23

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX5902_ _EUT-T+* -40°C to +85°C

6 SOT23-6

U6F+6

MAX5902_ _ETT-T+*

-40°C to +85°C

6 TDFN-6

T633+2

MAX5903_ _EUT-T+* -40°C to +85°C

6 SOT23-6

U6F+6

MAX5903_ _ETT-T+*

-40°C to +85°C

6 TDFN-6

T633+2

*For specific part numbers see the Selector Guide at end of

data sheet.

+Denotes lead-free package.

GND

16

ON/OFF

5

PGOOD (PGOOD)

MAX5902

MAX5903

SOT23-6

TOP VIEW

( ) ARE FOR MAX5903 ONLY.

2

34

DRAIN

GATE

Pin Configurations

Typical Operating Circuits

GND

ON/OFF

HOT-SWAP CONTROLLER

GND

50W ISOLATED

POWER SUPPLY

ON/OFF

LUCENT

JW050A1

GATE

DRAIN

PGOOD

+48V

BACKPLANE

CIRCUIT CARD

IRFR5410

MAX5902

Simple Swapper is a trademark of Maxim Integrated Products, Inc.

Pin Configurations continued at end of data sheet.

Typical Operating Circuits continued 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.