Overview
Features and Benefits
- Wide -9V to -100V Operation
- Requires No External Sense Resistor
- Drives External N-Channel MOSFET
- Limits Inrush Current
- Circuit-Breaker Function
- Less than 1mA Quiescent Current
- ON/Active-Low OFF Input Permits Load Power-Supply Control and Sequencing
- Adjustable Undervoltage Lockout
- Power-Good Output with 100V Rating
- Latching or Automatic Retry Fault Management
- Thermal Shutdown Helps Protect the External MOSFET
- Space-Saving 6-Pin SOT23 and TDFN Packages
Product Details
The MAX5900/MAX5901 are SOT23/TDFN hot-swap controllers that allow a circuit card to be safely hot-plugged into a live backplane without causing a glitch on the power-supply rail. These devices operate from -9V to -100V and provide the simplest hot-swap solution by eliminating all external components except an external n-channel MOSFET.
The MAX5900/MAX5901 limit the inrush current to the load and provide a circuit-breaker function for overcurrent protection. During startup, the circuit-breaker function is disabled and the MAX5900/MAX5901 limit the inrush current by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the circuit-breaker function is enabled and the MAX5900/MAX5901 provide overcurrent protection by monitoring the voltage drop across the external MOSFET's on-resistance.
The MAX5900/MAX5901 include an undervoltage lockout (UVLO) function, ON/active-low OFF control input, and a powergood status output, active-low PGOOD (MAX5900) or PGOOD (MAX5901). A built-in thermal shutdown feature is also included to protect the external MOSFET in case of overheating.
The MAX5900/MAX5901 offer latched or autoretry fault management and are available with 200mV, 300mV, or 400mV circuit-breaker thresholds. Both the MAX5900 and MAX5901 are available in small SOT23 and TDFN packages, and are specified for the extended -40°C to +85°C temperature range. For specific ordering information see the Selector Guide at the end of the data sheet.
Applications
- Base-Station Line Cards
- Network Hubs, Switches, Routers
- Servers
- Telecom Line Cards
Product Categories
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
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MAX5900 Reliability Data1/12/2023PDF33K
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Three Approaches to Creating Negative Low-Voltage Hot-Swap Circuits4/29/2009
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Understanding, Using, and Selecting Hot-Swap Controllers12/29/2003
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Advantages of IC-Based Hot-Swap Circuit Protection9/22/2003
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-48V Hot Swap Solution For Telecom Line Cards Assures Immunity To Input Voltage Transients2/10/2003
Design Resources
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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MAX5900 Discussions
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