• 简体中文
• English

MAX6399：High-Voltage, Overvoltage/Undervoltage, Protection Switch Controller

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.

Key Features 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

MAX6399: Typical Operating Circuit Applications/Uses Networking RAID Server Telecom

DataSheet

Parametrics

Quality and Environmental Data

• MAX6399.pdf

Related Products

• MAX16014：Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX16012：Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX16013：Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX16010：Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX16011：Ultra-Small, Overvoltage Protection/Detection Circuits
• MAX6398：Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V

Ordering Information