Datasheet > SMH4802_09

SMH4802_09

更新时间： 2022-03-25 08:54:09

品牌	Logo	应用领域
SUMMIT		控制器
页数	文件大小	规格书
19页	631K
描述
Programmable -48V Hot-Swap Controller with Forced Shut Down

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SMH4802_09 数据手册

SUMMIT

SMH4802

MICROELECTRONICS, Inc.

See Last Page

Preliminary Information

Programmable -48V Hot-Swap Controller with Forced Shut Down

FEATURES & APPLICATIONS

INTRODUCTION

l Soft Start Power Supply

The SMH4802 is designed to control in-rush current

during hot swapping of plug-in cards operating in a

distributed power environment. The device drives an

external power MOSFET switch that connects the supply

to the load and protects against over-current conditions

that might disrupt the host supply. It also provides under-

voltage and over-voltage monitoring of the host power

supply. When the source and drain voltages of the

external MOSFETs are within specification it will provide

a Power Good logic output that can be used to enable a

DC/DC converter. Additional features of the device

include: temperature sense or master enable input, a 5V

reference output for expanding monitor functions, and

duty-cycle or latched over-current protection modes. An

internal Shunt regulator allows a wide supply range. The

SMH4802 -48V Hot-Swap Controller also features a

simple software I²C Power On/Off Interface for remote

power control applications.

l Live Insertion into a -48V backplane

l ProgrammableControlofaDC/DCConverter

w I²C Power On/Off Control

l HighlyProgrammableCircuitBreaker

w Active In-rush Current Limiting

w Over-current Filter Circuit Breaker Immunity

to Voltage Steps and Current Spikes

l Programmable Forced Shutdown Timer

l Internal Shunt Regulator Allows a Wide Supply

Range

l 14-pin SOIC package

APPLICATIONS

l -48VPowerDistribution

w Telecom Line Cards

w CentralOfficeSwitching

w HighAvailabilityServers

w HotBoardInsertion

Programmingofconfiguration, controlandcalibrationval-

ues by the user can be simplified with the SMX3200

interface adapter and a windows based GUI supplied by

Summit.

SIMPLIFIED APPLICATION DRAWING

–48V Ret

SDA SCL

I²C

Header

Out+

DC/DC

Out–

V+

On/

Off

PG#

FS#

SMH4802

V–

EN/TS

DRAIN

SENSE

VSS

CBSENSE VGATE

5VREF

–48V A

–48V B

V_SS

2062 SAD

Figure 1. The drawing illustrates the SMH4802 in a typical line-card application. It should be noted this is just an

example, and the specific component values are purposely not shown. Pin numbers reflect SOIC package.

©SUMMIT MICROELECTRONICS, Inc., 2003

•

1717 Fox Drive

•

San Jose, CA 95131

• Phone 408-436-9890 • FAX 408-436-9897 • www.summitmicro.com

Characteristics subject to change without notice

2062 2.4 03/27/09

12 3 4 5 6 7...19

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