LTC4357IDCB#TRMPBF

LTC4357 is a positive high voltage ideal diode controller that drives an external N-channel MOSFET to replace a schottky diode. When used in diode-OR and high current diode applications, the LTC4357 reduces power consumption, heat dissipation, voltage loss and PC board area. The LTC4357 easily ORs power sources to increase total system reliability. In diode-OR applications, the LTC4357 controls the forward voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients. Applications include N + 1 redundant power supplies, high availability systems, advanced TCA systems, telecom infrastructure, automotive systems.

• Reduces power dissipation by replacing a power schottky diode with an N-channel MOSFET
• 0.5µs turn-off time limits peak fault current
• Wide operating voltage range from 9V to 80V
• Smooth switchover without oscillation
• No reverse DC current
• Supply current of 0.5mA typical at full operating temperature range
• IN pin current of 350µA typ (VIN = VOUT ±1V), OUT pin current of 80µA typ (VIN = VOUT ±1V)
• Gate turn-off time of 300ns typical (VGATE – VIN <lt/> 1V, CGATE = 0pF)
• 6-lead (2mm × 3mm) plastic DFN package, –40°C to 85°C temperature range

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