MAX31790
MAX31790
PRODUCTION6-Channel PWM-Output Fan RPM Controller
Versatile Fan RPM Controller Can Be Configured for Closed-Loop Control for Up to 6 Fans or Monitoring for Up to 12 Fans
- Part Models
- 2
- 1ku List Price
- Starting From $4.27
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Overview
- Provides Precise Fan Control and Monitoring for Large Fan Count Applications
- Controls Up to Six Independent Fans with PWM Drive
- Up to 12 Tachometer Inputs
- Controlled Duty Cycle Rate-of-Change for Best Acoustics
- Improves System Reliability
- Versatile Startup Configurations Provide Reliable Fan Control at Power-up without Having to Wait for System µC Direction
- I2C Bus Interface with Timeout and Watchdog
The MAX31790 controls the speeds of up to six fans using six independent PWM outputs. The desired fan speeds (or PWM duty cycles) are written through the I²C interface. The outputs drive "4-wire" fans directly, or can be used to modulate the fan's power terminals using an external pass transistor.
Tachometer inputs monitor fan tachometer logic outputs for precise (±1%) monitoring and control of fan RPM as well as detection of fan failure. Six pins are dedicated tachometer inputs. Any of the six PWM outputs can also be configured to serve as tachometer inputs.
The PWM_START inputs select the PWM output status at startup to ensure appropriate fan drive when power is first applied.
To ensure low acoustic impact of fan control, all changes in PWM duty cycle take place at a controlled, programmable rate.
The MAX31790's 3.0V to 5.5V supply voltage range and I²C-compatible interface make it ideal for fan control in a wide range of cooling applications. The MAX31790 is available in a 28-pin TQFN package and operates over the -40°C to +125°C temperature range.
Applications
- Networking
- Servers
- Telecom
Documentation
Data Sheet 1
Technical Articles 1
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 |
|---|---|---|---|
| MAX31790ATI+ | Thin Quad Flatpack, No Leads | ||
| MAX31790ATI+T | Thin Quad Flatpack, No Leads |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 4, 2026 - 2526 WAFER FAB |
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| MAX31790ATI+ | PRODUCTION | |
| MAX31790ATI+T | PRODUCTION | |
|
Feb 10, 2025 - 2455A ASSEMBLY |
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| MAX31790ATI+ | PRODUCTION | |
| MAX31790ATI+T | PRODUCTION | |
|
Jun 20, 2016 - 1612 ASSEMBLY |
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| MAX31790ATI+ | PRODUCTION | |
| MAX31790ATI+T | PRODUCTION | |
|
Apr 20, 2026 - 2571D PIN/ERRATA |
||
| MAX31790ATI+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
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Tools & Simulations
Software Development 2
Evaluation Kits
Evaluation Kit for the MAX31790