MAX6650
MAX6650
PRODUCTIONFan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface
Controls and Monitors Fan Speed for High-Performance Thermal Management
- Part Models
- 2
- 1ku List Price
- Starting From $4.23
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Overview
- Closed/Open-Loop Fan-Speed Control for 5V/12V Fans
- 2-Wire SMBus/I²C-Compatible Interface
- Monitors Tachometer Output
- Single Tachometer (MAX6650)
- Up to Four Tachometers (MAX6651)
- Programmable Alert Output
- GPIOs
- Hardware Full-On Override
- Synchronize Multiple Fans
- Four Selectable Slave Addresses
- 3V to 5.5V Supply Voltage
- Small Packages
- 10-Pin µMAX (MAX6650)
- 16-Pin QSOP (MAX6651)
The MAX6650/MAX6651 fan controllers use an SMBus/I²C-compatible interface to regulate and monitor the speed of 5VDC/12VDC brushless fans with built-in tachometers. They automatically force the fan's tachometer frequency (fan speed) to match a preprogrammed value in the Fan-Speed Register by using an external MOSFET or bipolar transistor to linearly regulate the voltage across the fan. The MAX6650 regulates the speed of a single fan by monitoring its tachometer output. The MAX6651 also regulates the speed of a single fan, but it contains additional tachometer inputs to monitor up to four fans and control them as a single unit when they are used in parallel.
The MAX6650/MAX6651 provide general-purpose input/output (GPIO) pins that serve as digital inputs, digital outputs, or various hardware interfaces. Capable of sinking 10mA, these open-drain inputs/outputs can drive an LED. To add additional hardware control, configure GPIO1 to fully turn on the fan in case of software failure. To generate an interrupt when a fault condition is detected, configure GPIO0 to behave as an active-low alert output. Synchronize multiple devices by setting GPIO2 (MAX6651 only) as an internal clock output or an external clock input.
The MAX6650 is available in a space-saving 10-pin µMAX® package, and the MAX6651 is available in a small 16-pin QSOP package.
Applications
- Computers: Desktop, Workstation, Server
- Networking
- RAID
- Servers
- Telecommunications
- Workstations
Documentation
Data Sheet 1
User Guide 1
Design Note 2
Technical Articles 6
Device Drivers 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX6650EUB+ | MINI_SO | ||
| MAX6650EUB+T | MINI_SO |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 20, 2026 - 2571B PIN/ERRATA |
||
| MAX6650EUB+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Fan Speed & Thermoelectric Cooler (TEC) Controllers 1 | ||
| MAX1669 | PRODUCTION | Fan Controller and Remote Temperature Sensor with SMBus Serial Interface |