The LTC4227 provides ideal diode or hot swap functionality for both power tracks by controlling an external nchannelmosfet. Allow on/off controls and report faults and power supply in good condition. As an ideal diode, the MOSFETs replace two high-power Schottky diodes and associated heat sinks, saving power and board area.
A hot-swap control MOSFET allows a plate to be securely inserted and operated from the active backplane by limiting the influx current. The power output also protects against short-circuit failures with fast-acting current limiting and internal timing circuit breakers. The LTC4227 regulates the forward voltage drop of the mosfet to ensure that current transfers smoothly from one power source to another without oscillating.
The diode is ideally turned on quickly to reduce load voltage drops during power switching. A quick shutdown minimizes reverse current transients if the input power supply is faulty or short circuited.
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 or less
● 0.5µs Ideal Diode 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
● 20-Lead 4mm x 5mm QFN and 16-Lead SSOP Packages
Applications
● Redundant power supplies and power supply usage
● Computer systems and servers
● Telecommunication network
Typical Application
Pin configuration
