LM5051

LM5051 www.ti.com SNVS702D – OCTOBER 2011 – REVISED MARCH 2013 LM5051 Low Side OR-ing FET Controller Check for Samples: LM5051 FEATURES 1 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. Typical Application Circuits GND Shutdown Status LINE OFF nFGD LM5051 VCC INN GATE INP/VSS GND + LOAD - -48V -VOUT Figure 1. Full Application with MOSFET Diagnostic 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconducto...