Linear Technology intros LTC4353 for low loss Oring

CALIFORNIA, USA: Linear Technology unveils the LTC4353, a 0V to 18V dual ideal diode controller. It replaces two high power Schottky diodes, enabling low loss Oring of multiple power sources with minimal disturbance to supply voltages.

To ensure smooth current transfer between supplies in diode-OR applications, the LTC4353 regulates the forward voltage drop across external N-channel MOSFETs. During supply switchover, a slow handoff between controllers results in a voltage droop in low voltage systems. During shortage or failure of input supply, a fast turn-off reduces 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, according to Linear.

Through the individual enable inputs, that LTC4353 provides, priority is ensured 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 75µA per supply. Individual status outputs indicate whether the MOSFETs are on or off.

The controller operates with supplies from 2.9V to 18V, and offers additional flexibility to control voltages down to 0V by applying an external supply. The controller operates with supplies from 2.9V to 18V, and offers additional flexibility to control voltages down to 0V by applying an external supply.

The LTC4353 is offered in both 16-Lead MSOP and 4mm x 3mm DFN packages and is specified over the commercial and industrial temperature ranges. It is priced at Rs.188.52 ($3.45) each in 1,000 piece quantities.