19-3494; Rev 1; 8/11
MAX5949A/MAX5949B
-48V Hot-Swap Controllers with External RSENSE
General Description
The MAX5949...
19-3494; Rev 1; 8/11
MAX5949A/MAX5949B
-48V Hot-Swap Controllers with External RSENSE
General Description
The MAX5949A/MAX5949B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5949A/MAX5949B 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 MAX5949A/MAX5949B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5949A/MAX5949B 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 MAX5949A and MAX5949B protect a system against overcurrent and short-circuit conditions by turning off the external
MOSFET in the event of a fault condition. The MAX5949A/MAX5949B also provide protection against input
voltage steps. During an input
voltage step, the MAX5949A/MAX5949B 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 MAX5949A or PWRGD for the MAX5949B) that can be used to enable downstream converters. The MAX5949A/MAX5949B are available in an 8-pin SO package. Both devices are specified for the extended -40°C to +85°C temperature range.
Applications
Telecom Line Cards
Network Switch...