LTC1421 Datasheet | Linear Technology

LTC1421/LTC1421-2.5 Hot Swap Controller Features s s s s s s s s s DESCRIPTION The LTC®1421/LTC1421-2.5 are Hot Swap TM 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 Nchannel 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 parator is set at 0.1V for LTC1421 and 2.5V for LTC1421-2.5. 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 U APPLICATIONS s s Hot Board Insertion Electronic Circuit Breaker , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. The LTC1421/LTC1421-2.5 are available in 24-pin SO and SSOP packages. TYPICAL APPLICATION Q3 1/2 Si4936DY C3 0.47µF VEE VDD R1 0.005Ω VCC STAGGERED CONNECTOR Q2 R2 0.025Ω 1/2 Si4936DY Q1 MTB50N06E R4 20k 5% D1 R3 1k 16 10 9 14 13 8 11 15 6 7 VCCLO SETLO GATELO VOUTLO VCCHI 2 CON2 24 AUXVCC C1 1µF 4 FAULT SETHI GATEHI VOUTHI RAMP CPON P - P + REF FB POUT PWRGD...