Alternative Parts

  • LTC4228-1 <br>LTC4228-2
    LTC4228-1
    LTC4228-2

    Dual Ideal Diode and Hot Swap Controller

  • LTC4235
    LTC4235

    Dual 12V Ideal Diode-OR and Single Hot Swap Controller with Current Monitor

Overview

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
  • 2.9V to 18V Operating Range
  • Current Monitor Output
  • Controls 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
  • Smooth Switchover without Oscillation
  • Fault, Power Good and Diode Status Outputs
  • LTC4236-1: Latch Off After Fault
  • LTC4236-2: Automatic Retry After Fault
  • 28-Pin 4mm x 5mm QFN Package

Product Details

The LTC4236 offers ideal diode-OR and Hot Swap functions for two 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 fast acting foldback current limit and electronic circuit breaker.

The LTC4236 regulates the forward voltage drop across the ideal diode MOSFETs to ensure smooth current transfer from one supply to the other without oscillation. The ideal diode MOSFETs 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 LTC4236 provides adjustable start-up delay, turn-on/-off control, and reports fault and power good status for the supply.

Applications

  • 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

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.

LTspice

Models for the following parts are available in LTspice:

LTC4236-1
LTC4236-2

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.

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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.


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Evaluation Boards Pricing displayed is based on 1-piece.
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.