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LTC4353 Dual Low Voltage
Ideal Diode Controller


Linear Technology introduces the LTC4353, a 0 V to 18 V dual ideal diode controller that replaces two high power Schottky diodes


Linear Technology LTC4353Linear Technology's LTC4353 regulates the forward voltage drop across external N-channel MOSFETs to ensure smooth current transfer between supplies in diode-OR applications. In low voltage systems, a slow handoff between controllers results in a voltage droop during supply switchover. The fast <1 µs turn-on time of the LTC4353 ensures smooth switchover from one path to the other without oscillation. In the event the input supply fails or is shorted, a fast turn-off minimizes reverse current. In addition to redundant power supply ORing, the LTC4353 makes an excellent diode replacement in supply holdup applications where momentary collapse of supply voltage is isolated from the load.

The LTC4353 provides individual enable inputs that can be used to ensure priority to the main supply when supply voltages are within a MOSFET body diode drop of each other. With both enable inputs pulled low, the LTC4353 consumes just 75 µA per supply. Individual status outputs indicate whether the MOSFETs are on or off. The controller operates with supplies from 2.9 V to 18 V, and offers additional flexibility to control voltages down to 0 V by applying an external supply.

Features
  • Low loss replacement for Schottky power diodes in multiple power supply or supply holdup applications
  • Controls external N-Channel MOSFETs for high current capability
  • 0 V to 18 V supply ORing or holdup
  • 1 µs turn-on and turn-off time
  • Enable inputs
  • MOSFET on-status outputs
  • Available in 16-Pin MSOP and DFN (4 mm x 3 mm) packages


Applications
  • Redundant power supplies
  • Supply holdup
  • High availability systems and servers
  • Telecom and network infrastructure

Digi-Key P/N Manufacturer P/N Description
LTC4353CDE#PBF-ND LTC4353CDE#PBF IC OR CTRLR N-CH 2CH 16DFN
LTC4353CMS#PBF-ND LTC4353CMS#PBF IC OR CTRLR N-CH 2CH 16MSOP
LTC4353IDE#PBF-ND LTC4353IDE#PBF IC OR CTRLR N-CH 2CH 16DFN
LTC4353IMS#PBF-ND LTC4353IMS#PBF IC OR CTRLR N-CH 2CH 16MSOP