LTC4228-1
LTC4228-2

RECOMMENDED FOR NEW DESIGNS

Dual Ideal Diode and Hot Swap Controller

Part Models: 16
1ku List Price: Starting From $4.30

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Overview

Power Path and Inrush Current Control for Redundant Supplies
Low Loss Replacement for Power Schottky Diodes
Protects Output Voltage from Input Brownouts
Allows Safe Hot Swapping from a Live Backplane
2.9V to 18V Operating Range
Controls N-Channel MOSFETs
Limits Peak Fault Current in ≤1μs
Adjustable Current Limit with Circuit Breaker
Adjustable Current Limit Fault Delay
Smooth Switchover without Oscillation
0.5μs Ideal Diode Turn-On and Turn-Off Time
Status, Fault and Power Good Outputs
LTC4228-1: Latch Off After Fault
LTC4228-2: Automatic Retry After Fault
28-Lead 4mm × 5mm QFN and SSOP Packages

The LTC4228 offers ideal diode and Hot Swap^™ functions for two power rails by controlling two external N-channel MOSFETs in each rail. MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area. Hot Swap control MOSFETs allow boards 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 current limit and internal timed circuit breaker.

The LTC4228 regulates the forward voltage drop across the external MOSFETs and sense resistor 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 switch-over. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.

The LTC4228 allows independent on/off control, and reports fault and power good status for the supply. The LTC4228 improves on the LTC4225 by recovering more quickly from input brownouts to preserve the output voltage.

Applications

Redundant Power Supplies
MicroTCA Systems and Servers
Telecom Networks
Power Prioritizer

Part Models: 16
1ku List Price: Starting From $4.30

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
LTC4228CGN-1#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228CGN-1#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228CGN-2#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228CGN-2#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228CUFD-1#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228CUFD-1#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228CUFD-2#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228CUFD-2#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228IGN-1#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228IGN-1#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228IGN-2#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228IGN-2#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228IUFD-1#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228IUFD-1#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228IUFD-2#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4228IUFD-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

Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC4228CGN-1#PBF	PRODUCTION
LTC4228CGN-1#TRPBF	PRODUCTION
LTC4228CGN-2#PBF	PRODUCTION
LTC4228CGN-2#TRPBF	PRODUCTION
LTC4228IGN-1#PBF	PRODUCTION
LTC4228IGN-1#TRPBF	PRODUCTION
LTC4228IGN-2#PBF	PRODUCTION
LTC4228IGN-2#TRPBF	PRODUCTION
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
LTC4228CUFD-1#PBF	PRODUCTION
LTC4228CUFD-1#TRPBF	PRODUCTION
LTC4228CUFD-2#PBF	PRODUCTION
LTC4228CUFD-2#TRPBF	PRODUCTION
LTC4228IUFD-1#PBF	PRODUCTION
LTC4228IUFD-1#TRPBF	PRODUCTION
LTC4228IUFD-2#PBF	PRODUCTION
LTC4228IUFD-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
Protection Switches & Controllers 3
LTC4227	RECOMMENDED FOR NEW DESIGNS	Dual Ideal Diode and Single Hot Swap Controller
LTC4370	RECOMMENDED FOR NEW DESIGNS	Two-Supply Diode-OR Current Balancing Controller
LTC4229	RECOMMENDED FOR NEW DESIGNS	Ideal Diode and Hot Swap Controller

Parts	Product Life Cycle	Description
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:

LTC4228-1
LTC4228-2

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.