1FEATURES

2• Wide operating input voltage range: -6V to -

100V

• -100V Transient Capability

• Gate drive for external N-Channel MOSFET

• MOSFET diagnostic test mode

• Fast 50ns response to current reversal

• 2A peak gate turn-off current

• Package: 8-Lead SOIC

APPLICATIONS

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

Supplies

DESCRIPTION

The LM5051 Low Side OR-ing FET Controller

operates in conjunction with an external MOSFET as

an ideal diode rectifier when connected in series with

a power source. This OR-ing controller allows

MOSFETs to replace diode rectifiers in power

distribution networks thus reducing both power loss

and voltage drops.

The LM5051 controller provides gate drive for an

external N-Channel MOSFET and a fast response

comparator to turn off the FET when current flows in

the reverse direction. The LM5051 can connect

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

withstand transients up to -100V.

The LM5051 also provides a FET test diagnostic

mode which allows the system controller to test for

shorted MOSFETs.