LT4423

RECOMMENDED FOR NEW DESIGNS

28V, 2A Ideal Diode and Load Switch

Data Sheet (Rev. 0) Product Selection Table

Part Models: 1
1ku List Price: Starting From $1.99

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Overview

Internal 200mΩ Power Path
Wide Operating Voltage Range: 1.9V to 28V
Reverse Current Protection
Load Switch Capability
Low 10μA Quiescent Current
Fast 3μs Response to Load Steps
Low 500nA Off State Current
Smooth Switchover in Diode-OR Applications
Integrated Thermal Protection
10-Lead (3mm x 2mm x 0.75mm) LDFN Package

The LT^®4423 is a 1.9V to 28V ideal diode and load switch with integrated P-channel MOSFETs. When enabled, 15mV forward voltage regulation minimizes power dissipation while increasing operating headroom and efficiency compared to a Schottky diode.

Using two LT4423s in diode-OR applications provide a seamless transfer to the highest available voltage under varying input supply conditions. A non-enabled LT4423 blocks up to 28V in either direction or polarity while exhibiting less than 1μA (typical) leakage current, providing orders of magnitude improvement over typical Schottky diodes, which leads to extended battery life.

Fast OUT to IN reverse bias detection minimizes reverse current, preventing undesired charging of input batteries. The open-drain STATUS output pulls low when the LT4423 is in shutdown, reverse bias, or under thermal protection. Integrated thermal detection protects from overtemperature conditions by disabling the power path.

APPLICATIONS

Schottky Diode Replacement
Battery and Wall Adapter Diode ORing
Backup Battery Diode ORing
Industrial and Consumer Hand-Held Applications

Part Models: 1
1ku List Price: Starting From $1.99

Documentation

Data Sheet 1

LT4423: 28V, 2A Ideal Diode and Load Switch Data Sheet (Rev.0) 10/17/2024

Evaluation Design File 1

EVAL-LT4423-AZ Design Files 10/17/2024

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
LT4423AV#TRPBF	LGA/CASON/CH ARRY SO NO LD	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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

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Evaluation Kits

28V, 2A Ideal Diode & Switch Load

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Product Details

The EVAL-LT4423-AZ evaluation circuit showcases the LT4423, an ideal diode with integrated back to back P-channel MOSFETs and a load switch designed to minimize power dissipation by regulating a 15mV forward voltage when enabled. Its fast OUT to IN reverse bias detection minimizes reverse current to prevent unwanted charging of the input source. The integrated thermal detection offers additional protection against over thermal conditions by disabling the power path.

The board features two independent LT4423 ideal diodes and load switches that share a common ground and operate over a 1.9V to 28V range.

Use the SHDN input to turn on and off power to the load. In shutdown mode, the LT4423 exhibits less than 500nA (typical) quiescent current to extend battery life. Design files for this circuit board are available.