Power Management Power Control PowerPath Controllers & Ideal Diodes
Power Management Hot Swap Controllers Low Voltage Hot Swap Controllers

LTC4227-1 and -2 - Dual Ideal Diode and Single Hot Swap Controller

LTC4370 - Two-Supply Diode-OR Current Balancing Controller

LTC4228-1/LTC4228-2 - Dual Ideal Diode and Hot Swap Controller

Features

  • 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

Typical Application

LTC4228 Typical Application
LTC4228 Typical Application

Description

The LTC®4228 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-28, SSOP-28

LTC4228 Package Drawing
LTC4228 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC4228CGN-1#PBF SSOP 28 C $5.13 $3.59 View
LTC4228CGN-1#TRPBF SSOP 28 C $3.65 View
LTC4228CGN-2#PBF SSOP 28 C $5.13 $3.59 View
LTC4228CGN-2#TRPBF SSOP 28 C $3.65 View
LTC4228CUFD-1#PBF QFN 28 C $5.13 $3.59 View
LTC4228CUFD-1#TRPBF QFN 28 C $3.65 View
LTC4228CUFD-2#PBF QFN 28 C $5.13 $3.59 View
LTC4228CUFD-2#TRPBF QFN 28 C $3.65 View
LTC4228IGN-1#PBF SSOP 28 I $5.64 $3.95 View
LTC4228IGN-1#TRPBF SSOP 28 I $4.01 View
LTC4228IGN-2#PBF QFN 28 I $5.64 $3.95 View
LTC4228IGN-2#TRPBF QFN 28 I $4.01 View
LTC4228IUFD-1#PBF QFN 28 I $5.64 $3.95 View
LTC4228IUFD-1#TRPBF QFN 28 I $4.01 View
LTC4228IUFD-2#PBF QFN 28 I $5.64 $3.95 View
LTC4228IUFD-2#TRPBF QFN 28 I $4.01 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1899A-A LTC4228-1 Demoboard | Dual Ideal Diode and Hot Swa $75.00
DC1899A-B LTC4228-2 Demoboard | Dual Ideal Diode and Hot Swa $75.00
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Click here to view our complete list of demo boards

Applications

  • Redundant Power Supplies
  • MicroTCA Systems and Servers
  • Telecom Networks
  • Power Prioritizer

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LTC4228-1
LTC4228-2

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