MAX5948A
Obsolete-48V Hot-Swap Controllers with External RSENSE
Overview
- 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
The MAX5948A/MAX5948B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5948A/MAX5948B 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 MAX5948B is pin- and function-compatible with both the LT1640AH and LT1640H.
The MAX5948A/MAX5948B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5948A/MAX5948B 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 MAX5948B 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/MAX5948B are available in an 8-pin SO package. Both devices are specified for the extended -40°C to +85°C temperature range.
Applications
- Base-Station Line Cards
- Central-Office Switching
- Network Routers and Switches
- Server Line Cards
Documentation
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 3 | ||
| MAX5920 | PRODUCTION | -48V Hot-Swap Controller with External RSENSE |
| MAX5921 | PRODUCTION | -48V Hot-Swap Controllers with External RSENSE and High Gate Pulldown Current |
| MAX5939 | PRODUCTION | -48V Hot-Swap Controllers with External RSENSE and High Gate Pulldown Current |
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