The MAX5948A/MAX5948BESA are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5948A/MAX5948BESA operate from -20V to -80V and are well-suited for -48V power systems. The MAX5948A is pin- and function-compatible with both the LT1640AL and LT1640L. The MAX5948BESA is pin- and function-compatible with both the LT1640AH and LT1640H. The MAX5948A/MAX5948BESA provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5948A/MAX5948BESA provide undervoltage, overvoltage, and overcurrent protection. These devices ensure the input voltage is stable and within tolerance before applying power to the load. Both the MAX5948A and MAX5948BESA protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition. Both devices feature an open-drain power-good status output, active-low PWRGD for MAX5948A or PWRGD for MAX5948B, that can be used to enable downstream converters. The MAX5948A/MAX5948BESA are available in an 8-pin SO package. Both devices are specified for the extended -40°C to +85°C temperature range.
Feature
- Allow Safe Board Insertion and Removal from a Live -48V Backplane
- Pin- and Function-Compatible with LT1640AL/LT1640L (MAX5948A)
- Pin- and Function-Compatible with LT1640AH/LT1640H (MAX5948B)
- Withstand -100V Input Transients with No External Components
- Operate from -20V to -80V
- Programmable Inrush and Short-Circuit Current Limits
- Programmable Overvoltage Protection
- Programmable Undervoltage Lockout
- Power Up into a Shorted Load
- Power-Good Control Output
Applications
- Base-Station Line Cards
- Central-Office Switching
- Network Routers and Switches
- Server Line Cards
