LTC4229

Features n Ideal Diode and Inrush Current Control for Redundant Supplies n Low Loss Replacement for Power Schottky Diode n Protects Output Voltage from Input Brownouts n Allows Safe Hot Swapping from a Live Backplane n 2.9V to 18V Operating Range n Controls Back-to-Back N-Channel MOSFETs n Limits Peak Fault Current in ≤1µs n Adjustable Current Limit with Foldback n Adjustable Start-Up and Current Limit Fault Delay n 0.5µs Ideal Diode Turn-On and Turn-Off Time n Undervoltage and Overvoltage Protection n Status, Fault and Power Good Outputs n Pin Selectable Latch Off or Automatic Retry After Fault n 24-Lead 4mm × 5mm QFN and SSOP Packages Applications n Redundant Power Supplies n Supply Holdup n High Availability Systems and Servers n Telecom and Network Infrastructure n Power Prioritizer LTC4229 Ideal Diode and Hot Swap Controller Description The LTC®4229 offers ideal diode and Hot Swap™ functions for a power rail by controlling two external N-channel MOSFETs. The MOSFET acting as an ideal diode replaces a high power Schottky diode and the associated heat sink, saving power and board area. The Hot Swap MOSFET control allows a board to be safely inserted and removed from a live backplane by limiting inrush current. The supply output is also protected against short-circuit faults with a fast acting foldback current limit and electronic circuit breaker. The LTC4229 regulates the forward voltage drop across the external MOSFET to ensure smooth current transfer in ...