MAX6499ATA/V+

Specialized ICS Overview

The MAX6499ATA+ is a high-voltage overvoltage-protection controller designed for automotive and industrial transient systems. It monitors input voltage and controls an external nMOSFET to isolate the load during overvoltage conditions or limit output voltage in limiter mode. The device operates within a supply voltage range of +5.5V to +72V. Key features include adjustable overvoltage and undervoltage thresholds, an integrated charge pump providing 10V gate-to-source enhancement, and thermal-shutdown protection. Qualified under AEC-Q100 standards, it is housed in a compact 3mm x 3mm TDFN-8 package.

Specialized ICS Feature Summary

• AEC-Q100 qualified for automotive reliability
• Adjustable overvoltage and undervoltage thresholds via OVSET and UVSET pins
• Integrated charge pump provides 10V gate drive for low RDS(ON) performance
• Thermal shutdown protection activates at +160°C junction temperature

Specialized ICS Applications

• Automotive electronics
• Industrial applications
• Telecom/Servers/Networking
• FireWire interfaces
• Notebook computers

Specialized ICS Procurement Notes

Verify component authenticity through authorized distributors. Confirm RoHS compliance status using the manufacturer's official documentation. Ensure the ordering suffix matches the required package type and temperature grade specifications.

Specialized ICS Selection Notes

Select this model when both overvoltage and undervoltage monitoring are required. Use external resistive dividers on the OVSET and UVSET pins to program specific trip points. Ensure adequate thermal contact between the IC and the external nMOSFET for effective thermal shutdown operation.

Specialized ICS Part Context

This part belongs to the MAX6495–MAX6499 family of overvoltage-protection circuits. While other variants offer different features such as power-good indicators (MAX6497/MAX6498) or reverse-battery protection with pMOSFETs (MAX6496), the MAX6499 specifically provides window detection capabilities for comprehensive power supervision.

Specialized ICS Replacement Considerations

Direct functional replacements within the same family include the MAX6495, MAX6496, MAX6497, and MAX6498. Note that these alternatives lack the specific combination of adjustable undervoltage threshold found in the MAX6499.

Specialized ICS FAQ

How does the MAX6499 handle overvoltage events?

When the monitored input exceeds the user-adjusted overvoltage threshold, the internal comparator quickly pulls the GATE output low, disconnecting the external nMOSFET and isolating the load.

What is the purpose of the CLEAR pin?

The CLEAR pin allows manual control of the overvoltage latch. Pulling CLEAR high latches the MOSFET off after an overvoltage condition, while pulsing it low resets the latch.

Can the MAX6499 operate as a voltage limiter?

Yes, by connecting the feedback network to the output side (source) of the nMOSFET, the GATE output saw-tooths to regulate and limit the voltage to the load.