MAX6641AUB90+

Thermal Management Overview

The MAX6641AUB90+ is an SMBus-compatible temperature monitor and automatic PWM fan-speed controller manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 3.0V to 5.5V and functions across an extended temperature range of -40°C to +125°C. The device integrates local and remote temperature sensing capabilities, utilizing an internal die sensor and a remote pn junction input for accurate thermal monitoring. It features an open-drain over-temperature alarm output and a programmable PWM output for direct fan control.

Thermal Management Feature Summary

• Integrates local and remote temperature sensing with SMBus digital interface
• Provides automatic PWM fan-speed control with programmable characteristics
• Features active-low over-temperature alarm output for system protection
• Includes automatic fan spin-up functionality to ensure reliable startup

Thermal Management Applications

• Desktop Computers
• Notebook Computers
• Workstations
• Servers
• Networking Equipment

Thermal Management Procurement Notes

Verify the specific ordering suffix '90' corresponds to the required SMBus slave address configuration before procurement. Confirm that the 10-pin µMAX package dimensions align with the target PCB footprint. Ensure the selected component meets the required automotive temperature range specifications if deployed in harsh environments. Cross-reference the manufacturer's latest documentation for any updates to pin definitions or register maps.

Thermal Management Selection Notes

Select this component when precise thermal management of CPUs, FPGAs, or ASICs is required via SMBus communication. It is suitable for designs needing automatic fan speed adjustment based on either local or remote diode temperatures. Consider the available SMBus addresses when designing systems with multiple thermal monitors on the same bus. Evaluate the PWM frequency options to match the specific requirements of the connected cooling fans.

Thermal Management Part Context

The MAX6641 belongs to a family of thermal management ICs designed for system-level temperature monitoring and fan control. Variants such as the MAX6641AUB92+, MAX6641AUB94+, and MAX6641AUB96+ share identical functional characteristics but differ in their default SMBus slave addresses. This allows multiple devices to coexist on a single serial bus without address conflicts, facilitating complex multi-zone thermal monitoring architectures.

Thermal Management Replacement Considerations

Public confirmed substitute part numbers include MAX6641AUB92+, MAX6641AUB94+, and MAX6641AUB96+. These variants maintain functional compatibility while offering different SMBus addressing configurations.