特点
Allows Safe Board Insertion and Removal from a Live Backplane
Controls Supply Voltages from 2.5V to 16.5V
Adjustable Soft-Start with Inrush Current Limiting
Fast Turn-Off Time
No External Gate Capacitor is Required
Power Good Input with Adjustable Timer and Glitch Filter
Power-Up Timeout Circuit Interfaces with External Supply Monitors
Dual Level Overcurrent Fault Protection
Automatic Retry or Latched Mode Operation
High Side Drive for an External N-Channel FET
MS10 Package
典型应用
典型应用
描述
The LTC?4212 is a Hot Swap? controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the gate of an external N-channel MOSFET for supply voltages ranging from 2.5V to 16.5V. The LTC4212 provides soft-start and inrush current limiting during the start-up period. It features a power-up timeout circuit that disconnects the system supply when the onboard supplies do not enter into regulation within an adjustable timeout period. The controller interfaces with external supply monitor ICs or directly with the PGOOD pin of a DC/DC converter. After normal power-up, a programmable power good glitch filter can be enabled to filter out short term dips in the supplies.
Two current limit comparators provide dual level overcurrent circuit breaker protection. The slow comparator trips at V CC – 50mV and activates in 18μs. The fast comparator trips at V CC – 150mV and typically responds in 500ns.
The LTC4212 can be configured for both latchoff and autoretry applications and is available in a 10-pin MSOP package.