LTC4236

RECOMMENDED FOR NEW DESIGNS

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

Part Models: 8
1ku List Price: Starting From $5.07

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Overview

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

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

Part Models: 8
1ku List Price: Starting From $5.07

Documentation

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4236CUFD-1#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4236CUFD-1#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4236CUFD-2#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4236CUFD-2#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4236IUFD-1#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4236IUFD-1#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4236IUFD-2#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4236IUFD-2#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC4236CUFD-1#PBF	PRODUCTION
LTC4236CUFD-1#TRPBF	PRODUCTION
LTC4236CUFD-2#PBF	PRODUCTION
LTC4236CUFD-2#TRPBF	PRODUCTION
LTC4236IUFD-1#PBF	PRODUCTION
LTC4236IUFD-1#TRPBF	PRODUCTION
LTC4236IUFD-2#PBF	PRODUCTION
LTC4236IUFD-2#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
LTC4228-1 LTC4228-2	RECOMMENDED FOR NEW DESIGNS	Dual Ideal Diode and Hot Swap Controller
LTC4235	RECOMMENDED FOR NEW DESIGNS	Dual 12V Ideal Diode-OR and Single Hot Swap Controller with Current Monitor

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4236-1
LTC4236-2

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.

Evaluation Kits

LTC4236-1 Demo Board | Dual Ideal Diode-OR & Single Hot Swap Controller with Current Monitor, Latch-Off Version

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Product Details

Demonstration circuit 2314A is intended to demonstrate the performance of the LTC4236-1/LTC4236-2 Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor. The controller operates in redundant 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.