LT4351IMS#PBF

LT4351 is a MOSFET diode-OR controller. It 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. 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, this device will regulate the voltage across the MOSFET(s) to 15mV. A STATUS pin indicates the MOSFET on-state. An internal boost regulator generates the MOSFET gate drive voltage. Low operating voltage allows for ORing of supplies as low as 1.2V. It is used in applications such as paralleled power supplies, uninterrupted supplies, high availability systems, N + 1 redundant power supplies etc.

• External N-channel MOSFETs for high current capability
• Internal boost regulator supply for MOSFET gate drive
• Wide input voltage range is 1.2V to 18V
• Fast switching MOSFET gate control
• Input under and overvoltage detection
• STATUS and FAULT outputs for monitoring
• Internal MOSFET gate clamp
• VIN supply current is 1.41mA typ at (VIN = 1.2V, VOUT = 1.1V, VDD = 12.3V)
• Operating temperature is -40°C to 85°C
• Package style is 10-lead plastic MSOP

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