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LT1421CG
LTC1421/LTC1421-2.5 Hot Swap Controller U FEATURES s s s s s s s s s DESCRIPTIO The LTC®1421/LTC1421-2.5 are Hot SwapTM 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. 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 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. U APPLICATIO S s s Hot Board Insertion Electronic Circuit Breaker The trip point of the ground sense comparator is set at 0.1V for LTC1421 and 2.5V for LTC1421-2.5. The LTC1421/LTC1421-2.5 are available in 24-pin SO and SSOP packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. U TYPICAL APPLICATIO Q3 1/2 Si4936DY C3 0.47µF Q2 R2 1 0.025Ω 2 1/2 Si4936DY VDD 3 R1 Q1 1 0.005Ω 2 MTB50N06E STAGGERED CONNECTOR VCC 3 23 D1 VCCLO R3 1k POR DATA BUS 19 LTC1421 GND 12 GND 20 FAULT 3 POR 1 CON1 DISABLE 5 1 BEA VCC 13 BEB 12 GND QS3384 QuickSwitch® BACKPLANE CLOAD 10k 21 18 VDD 12V 1A + 4 SETLO GATELO VOUTLO VCCHI 2 CON2 24 AUXVCC C1 1µF 4 FAULT 4 22 VEE – 12V 1A CLOAD + VEE R4 20k 5% 17 C2 0.1µF 16 SETHI GATEHI VOUTHI RAMP CPON COMP – COMP + REF FB COMPOUT PWRGD RESET 10 9 14 13 8 11 15 6 7 R5 16k 5% 1µF R6 20k 1% + CLOAD VCC 5V 5A R7 7.15k 1% µP I/O I/O RESET DATA BUS 1421 TA01 QuickSwitch IS A REGISTERED TRADEMARK OF QUALITY SEMICONDUCTOR CORPORATION. PC BOARD 1
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