-48V

-VOUT

INP/VSS

OFF

INN

GATE

LM5051

Shutdown

GND

GND

nFGD

Status

VCC

LINE

+

LOAD

-

LM5051

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SNVS702D – OCTOBER 2011 – REVISED MARCH 2013

LM5051 Low Side OR-ing FET Controller

Check for Samples: LM5051

1

FEATURES

DESCRIPTION

The LM5051 Low Side OR-ing FET Controller

2

•

Wide operating input voltage range: -6V to -

operates in conjunction with an external MOSFET as

100V

an ideal diode rectifier when connected in series with

•

-100V Transient Capability

a power source. This OR-ing controller allows

•

Gate drive for external N-Channel MOSFET

MOSFETs to replace diode rectifiers in power

distribution networks thus reducing both power loss

•

MOSFET diagnostic test mode

and voltage drops.

•

Fast 50ns response to current reversal

The LM5051 controller provides gate drive for an

•

2A peak gate turn-off current

external N-Channel MOSFET and a fast response

•

Package: 8-Lead SOIC

comparator to turn off the FET when current flows in

the reverse direction. The LM5051 can connect

APPLICATIONS

power supplies ranging from -6V to -100V and can

withstand transients up to -100V.

•

Active OR-ing of Redundant (N+1) Power

Supplies

The LM5051 also provides a FET test diagnostic

mode which allows the system controller to test for

shorted MOSFETs.

Typical Application Circuits

Figure 1. Full Application with MOSFET Diagnostic

1

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2011–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.