Alternative Parts

  • LTC4227

    Dual Ideal Diode and Single Hot Swap Controller

  • LTC4236

    Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor


Features and Benefits

  • Ideal Diode-OR and Inrush Current Control for Redundant Supplies
  • Low Loss Replacement for Power Schottky Diodes
  • Enables Safe Board Insertion into a Live Backplane
  • 9V to 14V Operation
  • Current Monitor Output
  • Controls N-Channel MOSFETs
  • Limits Peak Fault Current in ≤ 1μs
  • Adjustable Current Limit with Foldback
  • Adjustable Current Limit Fault Delay
  • 0.5μs Ideal Diode Turn-On and Turn-Off Time
  • Smooth Switchover without Oscillation
  • Fault and Power Good Outputs
  • LTC4235-1: Latch Off After Fault
  • LTC4235-2: Automatic Retry After Fault
  • 20-Pin 4mm x 5mm QFN Package

Product Details

The LTC4235 offers ideal diode-OR and Hot Swap 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.


  • Redundant Power Supplies
  • High Availability Systems and Servers
  • Telecom and Network Infrastructure

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Models for the following parts are available in LTspice:


Reference Materials

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.


LTC4235 Didn't find what you were looking for? Ask the Analog community »

Sample & Buy

Sample & Buy functionality exists in desktop site
Check Inventory

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

Price Table Help


Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.