2.0 A Negative Voltage Hot Swap Controller with Enhanced Programmability

The 34652 is a highly integrated -48 V hot swap controller with an internal Power MOSFET. It provides the means to safely install and remove boards from live -48 V backplanes without having to power down the entire system. It regulates the inrush current, from the supply to the load’s filter capacitor, to a user-programmable limit, allowing the system to safely stabilize. A disable function allows the user to disable the 34652 manually or through a microprocessor and safely disconnect the load from the main power line.

The 34652 has active high and active low power good output signals that can be used to directly enable a power module load. Programmable under- and overvoltage detection circuitry monitors the input voltage to check that it is within its operating range. A programmable start-up delay timer ensures that it is safe to turn on the Power MOSFET and charge the load capacitor.

A two-level current limit approach to controlling the inrush current and switching on the load limits the peak power dissipation in the Power MOSFET. Both current limits are user programmable.

特性 Features

? Integrated Power MOSFET and Control IC in a Small Outline Package

? Input Voltage Operation Range from -15 V to -80 V

? Programmable Overcurrent Limit with Auto Retry

? Programmable Charging Current Limit Independent of Load Capacitor

? Programmable Start-Up and Retry Delay Timer

? Programmable Overvoltage and Undervoltage Detection

? Active High and Low Power Good Output Signals

? Thermal Shutdown

? Pb-Free Packaging Designated by Suffix Code EF