Features and Benefits
- -10V to -80V Operation
- No External RSENSE Required
- Drives Large Power MOSFETS
- Eliminates Inrush Current Spikes During Hot Plug into Powered Backplane
- Eliminates Inrush Current Spikes and Dropping of Load During Large VIN Steps
- Adjustable Circuit-Breaker Threshold with Temperature Compensation
- Circuit-Breaker Fault with Transient Rejection
- Shorted Load Detection (Load Probe) Before Power MOSFET Turn-On
- Programmable Load-Voltage Slew Rate Controls Inrush Current
- ±2.4% Accuracy, Programmable Turn-On/Off Voltage (UVLO)
- Overvoltage Fault Protection with Transient Rejection
- Autoretry and Latched Fault Management Available
- Low Quiescent Current (1mA)
The MAX5938 is a hot-swap controller for -10V to -80V rails. The MAX5938 allows circuit line cards to be safely hot-plugged into a live backplane without causing a glitch on the power supply. It integrates an adjustable circuit-breaker function requiring no RSENSE.
The MAX5938 provides a controlled turn-on for circuit cards, which limits inrush current and prevents both glitches on the power-supply rail and damage to board connectors and components. Before startup, the MAX5938 performs a Load Probe™ test to detect the presence of a short-circuit condition. If a short-circuit condition does not exist, the device limits the inrush current drawn by the load by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the MAX5938 provides overcurrent and shortcircuit protection by monitoring the voltage drop across the RDS(ON) of the external power MOSFET. The MAX5938 integrates a 400mA fast GATE pulldown to guarantee that the external MOSFET is rapidly turned off in the event of an overcurrent or short-circuit condition.
The MAX5938 also protects the system against input voltage (VIN) steps. During an input voltage step, the device limits the current drawn by the load to a safe level without shutting down the load. The device also includes ON/OFF control, selectable PGOOD output polarity, undervoltage (UV) and overvoltage (OV) protection.
The device offers latched (MAX5938L) or autoretry (MAX5938A) fault management. Both the MAX5938A and MAX5938L are available in a 16-pin QSOP package and are specified for the extended (-40°C to +85°C) temperature range.
- Network Hubs, Switches, Routers
- Network Hubs, Switches, Routers
- Solid-State Circuit Breakers
- 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
MAX5938 Reliability Data1/12/2023
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
MAX5938 Companion Parts
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.View our quality and reliability program and certifications for more information.
|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|MAX5938AEEE+||Material Declaration||Reliability Data||16-QSOP-150_MIL|
|MAX5938AEEE+T||Material Declaration||Reliability Data||16-QSOP-150_MIL|
|Wafer Fabrication Data||MAX5938 Reliability Data|
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