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MOSFET Diode-OR Controller
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LT4351
MOSFET Diode-OR
Controller
DESCRIPTION FEATURES Low Loss Replacement for ORing Diode in Multiple
Sourced Power Supplies
n External N-Channel MOSFETs for High Current
Capability
n Internal Boost Regulator Supply for MOSFET Gate Drive
n Wide Input Range: 1.2V to 18V
n Fast Switching MOSFET Gate Control
n Input Under and Overvoltage Detectio STATUS and FAULT Outputs for Monitoring
n Internal MOSFET Gate Clamp
n Available in a 10-pin MSOP Package The LT®4351 creates a near ideal diode using external
single or back-to-back N-channel MOSFETs. This ideal
diode function permits low loss ORing of multiple power
sources. Power sources can easily be ORed together to
increase total system power and reliability with minimal
effect on supply voltage or efficiency. Disparate power
supplies can be efficiently ORed together. n The IC monitors the input supply with respect to the load
and turns on the MOSFET(s) when the input supply is
higher. If the MOSFET’s RDS(ON) is sufficiently small, the
LT4351 will regulate the voltage across the MOSFET(s)
to 15mV. A STATUS pin indicates the MOSFET on-state. APPLICATIONS n n An internal boost regulator generates the MOSFET gate …