LTC4235
Info : RECOMMENDED FOR NEW DESIGNS
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LTC4235

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 8
1ku List Price Starting From $4.72
Features
  • 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
Additional Details
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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.

Applications

  • Redundant Power Supplies
  • High Availability Systems and Servers
  • Telecom and Network Infrastructure
Part Models 8
1ku List Price Starting From $4.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC4235CUFD-1#PBF
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LTC4235CUFD-1#TRPBF
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LTC4235CUFD-2#PBF
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LTC4235CUFD-2#TRPBF
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LTC4235IUFD-1#PBF
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LTC4235IUFD-1#TRPBF
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LTC4235IUFD-2#PBF
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LTC4235IUFD-2#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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DC2315A-A

LTC4235-1 Demo Board | Dual 12V Ideal Diode-OR & Single Hot Swap Controller with Current Monitor, Latch-Off

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DC2315A-A

LTC4235-1 Demo Board | Dual 12V Ideal Diode-OR & Single Hot Swap Controller with Current Monitor, Latch-Off

LTC4235-1 Demo Board | Dual 12V Ideal Diode-OR & Single Hot Swap Controller with Current Monitor, Latch-Off

Product Detail

Demonstration circuit 2315A is intended to demonstrate the performance of the LTC4235-1/LTC4235-2 Dual 12V Ideal Diode-OR and Single Hot Swap™ Controller with Current Monitor. The controller operates in redundant 12V supply circuits, where each rail has an individual ideal diode, and the outputs are connected to the load through a single Hot Swap circuit. The controller enables monitoring of the load current by providing a signal that is 100× the sense resistor voltage.

reference details image

DC2315A-B

LTC4235-2 Demo Board | Dual 12V Ideal Diode-OR & Single Hot Swap Controller with Current Monitor, Auto-Retry

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DC2315A-B

LTC4235-2 Demo Board | Dual 12V Ideal Diode-OR & Single Hot Swap Controller with Current Monitor, Auto-Retry

LTC4235-2 Demo Board | Dual 12V Ideal Diode-OR & Single Hot Swap Controller with Current Monitor, Auto-Retry

Product Detail

Demonstration circuit 2315A is intended to demonstrate the performance of the LTC4235-1/LTC4235-2 Dual 12V Ideal Diode-OR and Single Hot Swap™ Controller with Current Monitor. The controller operates in redundant 12V supply circuits, where each rail has an individual ideal diode, and the outputs are connected to the load through a single Hot Swap circuit. The controller enables monitoring of the load current by providing a signal that is 100× the sense resistor voltage.


 


Tools & Simulations

Tools & Simulations 1

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.

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