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LTC4235

Linear
Part Number LTC4235
Manufacturer Linear
Description Dual 12V Ideal Diode-OR and Single Hot Swap Controller
Published Nov 4, 2020
Detailed Description LTC4235 Features Dual 12V Ideal Diode-OR and Single Hot Swap Controller with Current Monitor Description nn Ideal Dio...
Datasheet PDF File LTC4235 PDF File

LTC4235
LTC4235

Overview
LTC4235 Features Dual 12V Ideal Diode-OR and Single Hot Swap Controller with Current Monitor Description nn Ideal Diode-OR and Inrush Current Control for Redundant Supplies nn Low Loss Replacement for Power Schottky Diodes nn Enables Safe Board Insertion into a Live Backplane nn 9V to 14V Operation nn Current Monitor Output nn Controls N-Channel MOSFETs nn Limits Peak Fault Current in ≤ 1µs nn Adjustable Current Limit with Foldback nn Adjustable Current Limit Fault Delay nn 0.
5µs Ideal Diode Turn-On and Turn-Off Time nn Smooth Switchover without Oscillation nn Fault and Power Good Outputs nn LTC4235-1: Latch Off After Fault nn LTC4235-2: Automatic Retry After Fault nn 20-Pin 4mm x 5mm QFN Package Applications nn Redundant Power Supplies nn High Availability Systems and Servers nn Telecom and Network Infrastructure The LTC®4235 offers ideal diode-OR and Hot SwapTM functions for two 12V power rails by controlling external N-channel MOSFETs.
MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area.
A Hot Swap control MOSFET 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 foldback current limit and circuit breaker.
The LTC4235 regulates the forward voltage drop across the MOSFETs to ensure smooth current transfer from one supply to the other without oscillation.
The ideal diodes turn 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.
A current sense amplifier translates the voltage across the sense resistor to a ground referenced signal.
The LTC4235 allows turn-on/off control, and reports fault and power good status for the supply.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Cor...


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