19-2931; Rev 0; 8/03
-48V Hot-Swap Controller with External RSENSE
General Description
The MAX5920A/MAX5920B are hot-sw...
19-2931; Rev 0; 8/03
-48V Hot-Swap Controller with External RSENSE
General Description
The MAX5920A/MAX5920B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5920A/MAX5920B operate from -20V to -80V and are well-suited for -48V power systems. These devices are pin and function compatible with the LT4250 and pin compatible with the LT1640. The MAX5920A/MAX5920B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5920A/MAX5920B provide under
voltage, over
voltage, and overcurrent protection. These devices ensure the input
voltage is stable and within tolerance before applying power to the load. Both the MAX5920A and MAX5920B protect a system against overcurrent and short-circuit conditions by turning off the external
MOSFET in the event of a fault condition. The MAX5920A/MAX5920B also provide protection against input
voltage steps. During an input
voltage step, the MAX5920A/MAX5920B limit the current drawn by the load to a safe level without turning off power to the load. Both devices feature an open-drain power-good status output (PWRGD for the MAX5920A or PWRGD for the MAX5920B) that can be used to enable downstream converters. A built-in thermal-shutdown feature is also included to protect the external
MOSFET in case of overheating. The MAX5920A/MAX5920B are available in an 8-pin SO package. Both devices are specified for the ex...