LM5051 Datasheet, PDF (1/17 Pages) Texas Instruments – Low Side OR-ing FET Controller

LM5051
June 15, 2012
Low Side OR-ing FET Controller
General Description
The LM5051 Low Side OR-ing FET Controller operates in
conjunction with an external MOSFET as an ideal diode rec-
tifier 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.
Features
■ ^{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: SOIC-8 Narrow}
Applications
■ ^{Active OR-ing of Redundant (N+1) Power Supplies}
Typical Application Circuits
FIGURE 1. Full Application with MOSFET Diagnostic
30147701
30147702
FIGURE 2. Typical Redundant Supply Configuration
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