MAX6399

PRODUCTION

High-Voltage, Overvoltage/Undervoltage, Protection Switch Controller

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • High-Voltage Capability (72V) Allows Direct Monitoring, Ensuring Reliable System Operation in Automotive and Industrial Applications
    • Wide Supply Voltage Range (5.75V to 72V)
    • Specified from -40°C to +125°C
    • Adjustable DC-DC Input Undervoltage-Threshold Power-OK Output
    • Adjustable DC-DC Output Overvoltage Thresholds
  • Integrated Protection Features Improve System Reliability
    • Internal Charge Pump Ensures n-Channel MOSFET is Fully Enhanced During Normal Operation (VGS = 10V)
    • Fast GATE Shutoff During Overvoltage with 20mA Sink Capability
    • Latches Off External n-Channel MOSFET During High-Voltage Transients
    • Overtemperature-Shutdown Protection
  • Enables Functional Safety at System Level

The MAX6399 is a small overvoltage and undervoltage protection circuit. The device can monitor a DC-DC output voltage and quickly disconnect the power source from the DC-DC input load when an overvoltage condition occurs. A power-OK output signals when the DC-DC input voltage falls below an adjustable threshold. This controller architecture provides the ability to size the external n-channel MOSFET to meet specific load current requirements.

When the DC-DC monitored output voltage is below the user-adjustable overvoltage threshold, the GATE output of the MAX6399 goes high to enhance the n-channel MOSFET. The MAX6399 offers internal charge-pump circuitry that allows the GATE voltage to be 10V above the input voltage (VGS = 10V) to fully enhance the external n-channel MOSFET, thus minimizing the drain-to- source resistance.

When the monitored output voltage rises above the user-adjusted overvoltage threshold, the GATE output rapidly pulls low to shut off the MOSFET. The MOSFET remains latched off until either the MAX6399 input power or SHDN-bar input is cycled. The MAX6399 includes a logic-low shutdown input that disables the GATE. An internal overtemperature detector also disables the gate when the MAX6399 temperature reaches the thermal-shutdown threshold.

The device operates over a wide supply voltage range (5.75V to 72V) and is offered in a small TDFN package, fully specified from -40°C to +125°C.

Applications

  • Networking
  • RAID
  • Server
  • Telecom
MAX6399
High-Voltage, Overvoltage/Undervoltage, Protection Switch Controller
MAX6399: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 1

Technical Articles 4

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 6
MAX16010
PRODUCTION Ultra-Small, Overvoltage Protection/Detection Circuits
MAX16011
PRODUCTION Ultra-Small, Overvoltage Protection/Detection Circuits
MAX16012
PRODUCTION Ultra-Small, Overvoltage Protection/Detection Circuits
MAX16013
PRODUCTION Ultra-Small, Overvoltage Protection/Detection Circuits
MAX16014
Ultra-Small, Overvoltage Protection/Detection Circuits
MAX6398
PRODUCTION Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V
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