RENESAS ISL6144IVZA-T7A

The ISL6144 ORing MOSFET Controller and a suitably sized N-Channel power MOSFET(s) increases power distribution efficiency and availability when replacing a power ORing diode in high current applications. The ISL6144 can be used in 9V to 75V systems having similar power sources and has an internal charge pump to provide a floating gate drive for the N-Channel ORing MOSFET. The High Speed (HS) Comparator protects the common bus from individual power supply shorts by turning off the shorted feed’s ORing MOSFET in less than 300ns and ensuring low reverse current. An external resistor-programmable detection level for the HS Comparator allows users to set the N-Channel MOSFET V_OUT - V_IN trip point to adjust control sensitivity to power supply noise. The Hysteretic Regulating (HR) Amplifier provides a slow turnoff of the ORing MOSFET. This turn-off is achieved in less than 100μs when one of the sourcing power supplies is shutdown slowly for system diagnostics, ensuring zero reverse current. This slow turn-off mechanism also reacts to output voltage droop, degradation, or power-down. An open drain FAULT pin will indicate that a fault has occurred. The fault detection circuitry covers different types of failures; including dead short in the sourcing supply, a short of any two ORing MOSFET terminals, or a blown fuse in the power distribution path.

• Reverse Current Fault Isolation
• Internal Charge Pump Allows the use of N-Channel MOSFET
• HS Comparator Provides Very Fast <0.3µs Response Time to Dead Shorts on Sourcing Supply. HS Comparator also has Resistor-adjustable Trip Level
• HR Amplifier allows Quiet, <100µs MOSFET Turn-off for Power Supply Slow Shut Down
• Open Drain, Active Low Fault Output with 120µs Delay
• Provided in Packages Compliant to UL60950 (UL1950) Creepage Requirements
• QFN Package:
  • Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
• Pb-Free (RoHS Compliant)

• ORing MOSFET Control in Power Distribution Systems
• N + Ω^Ω Redundant Distributed Power Systems
• File and Network Servers (12V and 48V)
• Telecom/Datacom Systems