MAX6650：Fan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface
Controls and Monitors Fan Speed for High-Performance Thermal Management
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.
Key Features- 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)
| MAX6650, MAX6651: Typical Operating Circuit Applications/Uses- Computers: Desktop, Workstation, Server
- Networking
- RAID
- Servers
- Telecommunications
- Workstations
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DataSheet
Parametrics
| Part Number | Fan Cntrl. | Interface | Package/Pins | Budgetary
Price |
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| See Notes |
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| MAX6650 | Linear | 2-Wire/I2C/SMBus | µMAX/10 | $2.55 @1k |
| MAX6651 | QSOP/16 | $2.61 @1k |
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Design kits & evaluation modules
Quality and Environmental Data
Related Products
- MAX1669：Fan Controller and Remote Temperature Sensor with SMBus Serial Interface
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|
| MAX6650EUB | No Longer Available | MAX6650EUB+ | µMAX,;10 pin;15.4 mm² | -40°C to +85°C | No |
| MAX6650EUB+ | Active | | µMAX,;10 pin;15.4 mm² | -40°C to +85°C | Lead Free |
| MAX6650EUB+T | Active | | µMAX,;10 pin;15.4 mm² | -40°C to +85°C | Lead Free |
| MAX6650EUB-T | No Longer Available | MAX6650EUB+T | µMAX,;10 pin;15.4 mm² | -40°C to +85°C | No |
