MAX5920: -48V Hot-Swap Controller with External RSENSE Data Sheet (Rev. 0)9/17/2003310K
Features and Benefits
- Allows Safe Board Insertion and Removal from a Live -48V Backplane
- Pin- and Function-Compatible with LT4250L (MAX5920A)
- Pin-Compatible with LT1640L (MAX5920A)
- Pin- and Function-Compatible with LT4250H (MAX5920B)
- Pin-Compatible with LT1640H (MAX5920B)
- Circuit-Breaker Immunity to Input Voltage Steps and Current Spikes
- Withstands -100V Input Transients with No External Components
- Programmable Inrush and Short-Circuit Current Limits
- Operates from -20V to -80V
- Programmable Overvoltage Protection
- Programmable Undervoltage Lockout
- Powers Up into a Shorted Load
- Power-Good Control Output
- Thermal Shutdown Protects External MOSFET
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 undervoltage, overvoltage, 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 (active-low 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 extended -40°C to +85°C temperature range.
- Base-Station Line Cards
- Central-Office Line Cards
- Network Routers and Switches
- Server Line Cards
- Telecom Line Cards
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX5920 Reliability Data1/12/202333K
Programmable Fan Controllers6/21/2007
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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