Characteristics subject to change without notice

1

2044 6.1 2/8/01

SMH4811A

SUMMIT

MICROELECTRONICS, Inc.

©SUMMIT MICROELECTRONICS, Inc., 2000 • 300 Orchard City Dr., Suite 131 • Campbell, CA 95008 • Phone 408-378-6461 • FAX 408-378-6586 • www.summitmicro.com

Preliminary

l Supply Range ±20VDC to >±500VDC

l Versatile Card Insertion Detection Supports:

w Multi-length Pin Systems

w Card Injector Switch Sensing

w Programmable Debounce Periods

l Control Powering-on of DC/DC Converters

l Highly Programmable Host Voltage Monitoring

w Programmable Under- and Over-voltage

Detection

w Programmable UV Filter

l Programmable Power Good Delay for enabling

the DC/DC Converter

l Programmable Circuit Breaker Function

w Programmable Over-Current Filter

w Programmable Quick-Trip™ Circuit Breaker

Values

l 2.5V and 5.0V reference outputs

w Easy Expansion of External Monitor

Functions

Distributed Power Hot-Swap Controller

FEATURES

The SMH4811A is designed to control hot swapping of

plug-in cards operating from a single supply ranging from

20V to 500V. It provides under-voltage and over-voltage

monitoring of the host power supply, drives an external

power MOSFET switch that connects the supply to the

load, and also protects against over-current conditions

that might disrupt the host supply. When the input and

output voltages to its controls are within specification, it

provides a Power Good logic output that may be used to

turn loads on (

e.g., an isolated-output DC-DC converter,

or drive a LED status light). Additional features of the

SMH4811A include: temperature sense or master enable

input, 2.5V and 5V reference outputs for expanding moni-

tor functions, two Pin-Detect enable inputs for fault protec-

tion, and duty-cycle over-current protection.

DESCRIPTION

SIMPLIFIED APPLICATION DRAWING

VDD

VSS

CBSENSE

PD1#

PD2#

UV

OV

2.5VREF

PG#

5.0VREF

2044 SAD 5.1

0V

–48V

VGATE

Pin Detect

Pin Detect

DC/DC

SMH4811A

FAULT#

ENPG

Disable/Enable