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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
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Documentation
Reliability Data (1)
Evaluation Kit Manuals (1)
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.
Models for the following parts are available in LTspice:
Reference Materials
Product Selector Card (1)
Solutions Bulletins & Brochures (1)
Press Releases (1)
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.
Support & Discussions
LTC4236 Discussions
Sample & Buy
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.
