MAX5923EUP+T【PDF 1/12 页】IC HOT-SWAP SWITCH +60V 20-TSSOP

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General Description

The MAX5923 is a fully integrated Simple Swapper"

hot-swap switch for positive supply rails. The device

allows the safe insertion and removal of circuit cards

into live backplanes or ports without causing glitches

on the power-supply rail. The device also monitors vari-

ous circuit parameters and disconnects the load if a

fault condition occurs, alerting the host with a logic-

level FAULT output. The MAX5923 operates over the

+16V to +60V input voltage range.

During startup, an integrated 0.45& power MOSFET

regulates the current and voltage between the back-

plane power source and the load. After startup, the

MOSFET is fully enhanced to reduce its on-resistance.

To ensure robust operation, the MAX5923 contains

built-in safety features that monitor fault conditions and

prevent damage to the internal MOSFET.

The MAX5923 monitors three parameters for fault condi-

tions: zero current, overcurrent, and thermal overload.

The output overcurrent limit counts the time the MAX5923

spends in an overcurrent condition and shuts down the

pass transistor if the current limit is exceeded for the over-

current time limit. The zero-current detection counts the

time the output current is below the zero-current threshold

and shuts down the pass transistor if the counter reaches

the zero-current time limit. The thermal monitoring feature

shuts down the pass transistor if the die temperature

reaches the overtemperature limit. A fault logic output

indicates when an overtemperature or an overcurrent

condition has occurred and a zero-current logic output

indicates if there is a zero-current condition.

An undervoltage detection circuitry keeps the pass tran-

sistor off until the input voltage is above the undervoltage

lockout (UVLO) threshold, which is internally set or can be

set externally with a resistive divider. A power-OK (POK)

output is provided to signal when the output voltage has

reached to within 0.75V of the input voltage. An Enable

input allows the host system to disconnect the system

from the load and/or reset a fault condition by toggling

Enable.

The MAX5923 is available in a 20-pin TSSOP package

and operates in the extended -40癈 to +85癈 tempera-

ture range.

Applications

Features

o Wide Operating Input Range: +16V to +60V

o 0.45& Integrated Power Switch

o Programmable Output Current Up to 800mA

o Over/Undercurrent-Limit Detection

o Input Logic Signals Compatible with 1.8V to 5V

CMOS Logic

o Separate Analog and Digital Grounds with Up to

?V Offset

o Power-OK Status Output

o Overcurrent Protection with Status Outputs

o Built-In Thermal Shutdown

o Internal Switch Protection Circuitry

o Current-Limit Foldback with Timeout and Duty-

Cycle Control

o Latch or Autorestart Fault Management

+60V Simple Swapper Hot-Swap Switch

________________________________________________________________ Maxim Integrated Products 1

19-2850; Rev 0; 4/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxims website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

MAX5923EUP

-40癈 to +85癈

20 TSSOP

Ordering Information

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

RPU

+1.65V TO +5.5V

OFF

SENSE

+16V TO +60V

MAX5923

DRAIN

UVLO

ALL SIGNAL AND DIGITAL INPUTS/OUTPUTS ARE REFERENCED TO DGND.

DGND CAN BE ?V FROM AGND_S.

AGND_S

DGND

POK

FAULT

ZC_EN

LATCH

VDIG

OUT

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

Network Routers/Switches

Current Limiter

Servers

Industrial Equipment

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