LTC4225-1LTC4225-2 Series

Dual Ideal Diode and Hot Swap Controller

Catalog

Dual Ideal Diode and Hot Swap Controller

Part	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Programmable Features	Number of Channels [custom]	Current - Supply	Type	Package / Case	Features	Supplier Device Package	Applications	Package / Case [custom]
Analog Devices LTC4225CUFD-1#PBF	2.9 V	18 V	Surface Mount	70 °C	0 °C	Current Limit Fault Timeout Slew Rate	2	2.8 mA	Hot Swap Controller OR Controller	24-WFQFN Exposed Pad	Latched Fault UVLO	24-QFN (4x5)	General Purpose
Analog Devices LTC4225CGN-1#TRPBF	2.9 V	18 V	Surface Mount	70 °C	0 °C	Current Limit Fault Timeout Slew Rate	2	2.8 mA	Hot Swap Controller OR Controller	24-SSOP	Latched Fault UVLO	24-SSOP	General Purpose	0.154 " 3.9 mm
Analog Devices LTC4225IUFD-2#PBF	2.9 V	18 V	Surface Mount	85 °C	-40 °C	Current Limit Fault Timeout Slew Rate	2	2.8 mA	Hot Swap Controller OR Controller	24-WFQFN Exposed Pad	Auto Retry UVLO	24-QFN (4x5)	General Purpose
Analog Devices LTC4225IGN-1#PBF	2.9 V	18 V	Surface Mount	85 °C	-40 °C	Current Limit Fault Timeout Slew Rate	2	2.8 mA	Hot Swap Controller OR Controller	24-SSOP	Latched Fault UVLO	24-SSOP	General Purpose	0.154 " 3.9 mm
Analog Devices LTC4225IGN-2#TRPBF	2.9 V	18 V	Surface Mount	85 °C	-40 °C	Current Limit Fault Timeout Slew Rate	2	2.8 mA	Hot Swap Controller OR Controller	24-SSOP	Auto Retry UVLO	24-SSOP	General Purpose	0.154 " 3.9 mm

Catalog

Dual Ideal Diode and Hot Swap Controller

Key Features

• Power Path and Inrush Current Control for Redundant Supplies

• Low Loss Replacement for Power Schottky Diodes

• Allows Safe Hot Swapping from a Live Backplane

• 2.9V to 18V Operating Range

• Controls N-Channel MOSFETs

• Limits Peak Fault Current in ≤1μs

• 0.5μs Turn-On and Reverse Turn-Off Time

• Adjustable Current Limit with Circuit Breaker

• Smooth Switchover without Oscillation

• Adjustable Current Limit Fault Delay

• Fault and Power Status Output

• LTC4225-1: Latch Off After Fault

• LTC4225-2: Automatic Retry After Fault

• 24-Lead 4mm × 5mm QFN and SSOP Packages

Description

The LTC4225 offers ideal diode and Hot Swap™functions for two power rails by controlling external series connected N-channel MOSFETs. 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 LTC4225 regulates the forward voltage drop across the back-to-back 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 switch-over. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.The LTC4225 allows independent on/off control, and reports fault and power good status for the supply. The LTC4225-1 features a latch-off circuit breaker, while the LTC4225-2 provides automatic retry after a fault.ApplicationsRedundant Power SuppliesSupply HoldupMicroTCA Systems and ServersTelecom NetworksPower Prioritizer