LTC4355IMS#PBF

LTC4355 is a positive voltage ideal diode-OR controller that drives two external N-channel MOSFETs. Forming the diode-OR with N-channel MOSFETs instead of schottky diodes reduces power consumption, heat dissipation and PC board area. With the device, power sources can easily be ORed together to increase total system reliability. This device can diode-OR two positive supplies or the return paths of two negative supplies, such as in a –48V system. In the forward direction the device controls the voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If a power source fails or is shorted, fast turn off minimizes reverse current transients. It is widely used in application such as high availability systems, advancedTCA® (ATCA) systems, +48V and –48V distributed power systems, telecom infrastructure etc.

• Turn-off time limits peak fault current is 0.3µs
• Wide operating voltage is 9V to 80V
• Smooth switchover without oscillation
• No reverse DC current
• Monitors VIN, fuse, and MOSFET diode
• Supply current is 2mA typ
• INx pin threshold voltage is 3.5V
• Gate turn-off time is 0.3µs typ
• Operating temperature is –40°C to 85°C
• Package style is 16-lead plastic MSOP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party