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LTC4229 - Ideal Diode and Hot Swap Controller

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 diode-OR applications. The ideal diode turns on quickly to reduce the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.

The LTC4229 provides adjustable start-up delay, undervoltage and overvoltage protection, and reports fault and power good status for the supply. It can be configured for latch off or automatic retry after a fault.

Features Ideal Diode and Inrush Current Control for Redundant Supplies Low Loss Replacement for Power Schottky Diode Protects Output Voltage from Input Brownouts Allows Safe Hot Swapping from a Live Backplane 2.9V to 18V Operating Range Controls Back-to-Back N-Channel MOSFETs Limits Peak Fault Current in ≤1μs Adjustable Current Limit with Foldback Adjustable Start-Up and Current Limit Fault Delay 0.5μs Ideal Diode Turn-On and Turn-Off Time Undervoltage and Overvoltage Protection Status, Fault and Power Good Outputs Pin Selectable Latch Off or Automatic Retry After Fault 24-Lead 4mm × 5mm QFN and SSOP Packages Typical Application

Applications Redundant Power Supplies Supply Holdup High Availability Systems and Servers Telecom and Network Infrastructure Power Prioritizer Packaging

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