MAX6499ATA/V+T

Specialized ICS Overview

The MAX6499ATA/V+T is an automotive-grade overvoltage protection controller designed for high-voltage transient systems. It operates within a supply voltage range of +5.5V to +72V and utilizes an integrated charge pump to provide a 10V gate-to-source enhancement for external nMOSFETs. The device features adjustable overvoltage and undervoltage thresholds, enabling window detection capabilities. Upon detecting an overvoltage condition, the GATE output latches off until cleared via the CLEAR pin or power cycle. It is housed in a thermally enhanced 8-TQFN (3mm x 3mm) package.

Specialized ICS Feature Summary

• Adjustable Overvoltage and Undervoltage Thresholds: Supports window detection by monitoring both upper and lower voltage limits using OVSET and UVSET pins.
• Overvoltage Latch Function: The nMOSFET remains latched off after an overvoltage event until the CLEAR input is pulsed low or the SHDN pin is cycled.
• Integrated Charge Pump: Generates a 10V gate drive to fully enhance external nMOSFETs, ensuring low RDS(ON) performance.
• AEC-Q100 Qualified: Certified for automotive applications with an operating temperature range of -40°C to +125°C.

Specialized ICS Applications

• Automotive load dump protection
• Industrial high-voltage transient systems
• Telecom/Servers/Networking power distribution

Specialized ICS Procurement Notes

Verify the specific suffix 'ATA/V+T' against the manufacturer's current datasheet to confirm the exact tape-and-reel quantity and RoHS compliance status. Ensure the ordering information matches the latest production release notes, as packaging quantities may vary by region.

Specialized ICS Selection Notes

Select this component when window detection (both overvoltage and undervoltage) is required. Unlike the MAX6495/MAX6496 which only monitor overvoltage, the MAX6499 includes a dedicated UVSET pin. Ensure the external nMOSFET is sized to handle the thermal dissipation if operating in limiter mode, and verify that the latch-clear mechanism fits the system reset requirements.

Specialized ICS Part Context

This part belongs to the MAX6495–MAX6499 family of 72V overvoltage-protection switches and limiter controllers. While the MAX6495 provides basic overvoltage switching and the MAX6496 supports reverse-battery protection with pMOSFETs, the MAX6499 specifically adds undervoltage monitoring and a latch-clear feature for robust fault management in critical power rails.

Specialized ICS Replacement Considerations

Direct functional replacements within the same family include MAX6495ATT/V+T (without undervoltage/latch) and MAX6496ATA/V+T (with reverse-battery support). Cross-family replacements require verifying voltage ranges and package compatibility.

Specialized ICS FAQ

How does the MAX6499 handle overvoltage faults compared to the MAX6495?

The MAX6499 includes an overvoltage latch function that keeps the external MOSFET off after a fault until the CLEAR pin is pulsed low or the SHDN pin is cycled. The MAX6495 automatically retries once the input voltage drops below the threshold.

What is the purpose of the UVSET pin on the MAX6499?

The UVSET pin allows users to set an undervoltage threshold, enabling the device to function as a window detector. If the monitored voltage falls below this lower limit, the GATE output turns off the external MOSFET.

Can the MAX6499 operate as a voltage limiter?

Yes, the MAX6499 can be configured as a voltage limiter where the GATE output saw-tooths to regulate the output voltage during transients, though it also supports standard switch-off isolation modes.