LTC1421-2.5 Datasheet

• Allows Safe Board Insertion and Removal from a Live Backplane
• System Reset and Power Good Control Outputs
• Programmable Electronic Circuit Breaker
• User Programmable Supply Voltage Power-Up Rate
• High Side Driver for Two External N-Channels
• Controls Supply Voltages from 3V to 12V
• Connection Inputs Detect Board Insertion or Removal
• Undervoltage Lockout
• Power-On Reset Input

• Hot Board Insertion
• Electronic Circuit Breaker

The LTC1421-2.5 are Hot Swap^™ controllers that allow a board to be safely inserted and removed from a live backplane. Using external N-channel pass transistors, the board supply voltages can be ramped up at a programmable rate. Two high side switch drivers control the N-channel gates for supply voltages ranging from 3V to 12V.

A programmable electronic circuit breaker protects against shorts. Warning signals indicate that the circuit breaker has tripped, a power failure has occurred or that the switch drivers are turned off. The reset output can be used to generate a system reset when the power cycles or a fault occurs. The two connect inputs can be used with staggered connector pins to indicate board insertion or removal. The power-on reset input can be used to cycle the board power or clear the circuit breaker.

The trip point of the ground sense comparator is set 2.5V for LTC1421-2.5.

The LTC1421-2.5 are available in 24-pin SO and SSOP packages.