LTC4235

RECOMMENDED FOR NEW DESIGNS

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

Part Models: 8
1ku List Price: Starting From $4.72

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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
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

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

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
LTC4235CUFD-1#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4235CUFD-1#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4235CUFD-2#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4235CUFD-2#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4235IUFD-1#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4235IUFD-1#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4235IUFD-2#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4235IUFD-2#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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
LTC4227	RECOMMENDED FOR NEW DESIGNS	Dual Ideal Diode and Single Hot Swap Controller
LTC4236	RECOMMENDED FOR NEW DESIGNS	Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4235-1
LTC4235-2

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

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

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Product Details

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.