LTC4421

RECOMMENDED FOR NEW DESIGNS

High Power Prioritized PowerPath Controller

Data Sheet (Rev. A) Product Selection Table

Part Models: 14
1ku List Price: Starting From $4.65

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Overview

0V to 36V Wide Operating Range (60V Tolerant)
Drives Large External N-Channel MOSFETs for High Output Current Applications
Accurately Limits Inrush Current
Connects Highest Priority Valid Supply to Output Load
Changes Channel Priority in Real Time

±2% OV, UV Input Comparators
Individually Adjustable Current Limit Time-Out for Each Channel
Adjustable Input Validation Time
Fast Switchover Minimizes V_OUT Droop
36-Lead 5mm × 6mm QFN and SSOP Packages
AEC-Qualified for Automotive Applications

The LTC4421 connects one of two input supplies to a common output based on user-defined priority and validity. By definition, the supply connected to V1 is the higher priority supply, although this can be changed dynamically. External resistive dividers set the undervoltage and overvoltage thresholds that bound the valid voltage window.

Strong gate drivers switch the large external N-channel MOSFETs quickly. Fast switchover circuitry minimizes output droop when changing channels while preventing reverse and cross conduction. A fast comparator detects input short circuits and quickly turns off the N-channel MOSFETs to minimize disruption.

External sense resistors set the maximum inrush and current limit currents. During current limiting, the LTC4421 controls the N-channel MOSFET gate to regulate 25mV across the sense resistor. When the sense resistor voltage has been regulated to 25mV for a user-settable time, the channel is disconnected and a fault is set.

Applications

High Reliability Systems
Server Based Back-Up Systems
Industrial Handheld Instruments
Battery Back-Up Systems
Automotive Applications

Part Models: 14
1ku List Price: Starting From $4.65

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
LTC4421CG#PBF	SSOP 5.3 MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421CG#TRPBF	SSOP 5.3 MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421CUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421CUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421HG#PBF	SSOP 5.3 MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421HG#TRPBF	SSOP 5.3 MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421HG#WPBF	SSOP 5.3 MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421HG#WTRPBF	SSOP 5.3 MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421HUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421HUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421IG#PBF	SSOP 5.3 MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421IG#TRPBF	SSOP 5.3 MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421IUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4421IUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG
		PCN22_0171_Form Material_Report Delta Qualification Matrix
LTC4421CG#PBF	PRODUCTION
LTC4421CG#TRPBF	PRODUCTION
LTC4421HG#PBF	PRODUCTION
LTC4421HG#TRPBF	PRODUCTION
LTC4421IG#PBF	PRODUCTION
LTC4421IG#TRPBF	PRODUCTION
Nov 18, 2019 - 19_0266 Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC
		PCN19_0266_Form Material_Report Detailed Parts List
LTC4421CG#PBF	PRODUCTION
LTC4421CG#TRPBF	PRODUCTION
LTC4421HG#PBF	PRODUCTION
LTC4421HG#TRPBF	PRODUCTION
LTC4421IG#PBF	PRODUCTION
LTC4421IG#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4421

Design Tool 1

LTC4421 Design Tool

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

LTC4421 Demo Board | Dual Channel Prioritized Powerpath Controller

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Product Details

Demonstration circuit 2866A features the LTC4421 Dual Supply High Power Prioritized Powerpath^™ Controller in a 12V/24V, 10A application. The LTC4421 incorporates strong gate drivers to switch large external N-channel MOSFETs and fast switchover circuitry to minimize V_OUT droop while preventing reverse and cross conduction currents, making it an ideal solution for high reliability systems, battery back up systems, and servers. DC2866A arbitrates between two input supply rails, selecting the highest priority, valid supply to power the load. By definition, the supply connected to V1 is the higher priority supply, although it can be changed dynamically. External resistive dividers set the undervoltage and overvoltage thresholds that bound the valid voltage window. External sense resistors set the limit on maximum current that can flow to the load. Two or more DC2866As can be cascaded to provide switchover between more than two rails.