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APPLICATIONS• -48V Hot Swap Power Backplane/DistribuTIon CentralOffice, Ethernet for VOIP• PosiTIve Voltage Hotswap 12V to 60V ApplicaTIons(low side switching)• Card Insertion Detection• IP Phone Applications• Databus Power Interfacing• Custom Industrial Power Backplanes• Distributed Power SystemsDESCRIPTIONThe X80070 is a hot swap controller that allows a board to besafely inserted and removed from a live backplane withoutturning off the main power supply.During insertion, the gate of an external power MOSFET isclamped low to suppress contact bounce. Theundervoltage/overvoltage circuits and the power-on resetcircuitry suppress the gate turn on until the mechanical bouncehas ended. The X80070 turns on the gate with a slew rate tolimit the inrush current and incorporates an electronic circuitbreaker set by a sense resistor. After the load is successfullycharged, the PWRGD signal is asserted; indicating that thedevice is ready to power sequence the DC-DC power bricks.At all times, the X80070 monitors for undervoltage, overvoltage,and overcurrent conditions. If any fault occurs, the gate will beimmediately shut off and the PWRGD will be returned to theinactive state. The X80070 contains overvoltage, undervoltageand overcurrent detection, hardshort retry, gate control slewrate and power good control.
