MAX6620
MAX6620
PRODUCTIONQuad Linear Fan-Speed Controller
Industry’s First Linear Fan Controller with RPM Control—Controls Up to Four Fans with a Single IC
- Part Models
- 2
- 1ku List Price
- Starting From $4.50
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Overview
- Controls Up to Four Independent Fans with Linear (DC) Drive
- Uses Four External Low-Cost Pass Transistors
- 1% Accuracy Precision RPM Control
- Controlled Voltage Rate-Of-Change for Best Acoustics
- I²C Bus Interface
- 3.0V to 5.5V Supply Voltage Range
- 250µA (typ) Operating Supply Current
- 3µA (typ) Shutdown Supply Current
- Small 5mm x 5mm Footprint
The MAX6620 controls the speeds of up to four fans using four independent linear voltage outputs. The drive voltages for the fans are controlled directly over the I²C interface. Each output drives the base of an external bipolar transistor or the gate of a FET in high-side drive configuration. Voltage feedback at the fan's power-supply terminal is used to force the correct output voltage.
The MAX6620 offers two methods for fan control. In RPM mode, the MAX6620 monitors four fan tachometer logic outputs for precise (±1%) control of fan RPM and detection of fan failure. In DAC mode, each fan is driven with a voltage resolution of 9 bits and the tachometer outputs of the fans are monitored for failure.
The DAC_START input selects the fan power-supply voltage at startup to ensure appropriate fan drive when power is first applied. A watchdog feature turns the fans fully on to protect the system if there are no valid I²C communications within a preset timeout period.
The MAX6620 operates from a 3.0V to 5.5V power supply with low 250µA supply current, and the I²C-compatible interface makes it ideal for fan control in a wide range of cooling applications. The MAX6620 is available in a 28-pin TQFN package and operates over the -40°C to +125°C automotive temperature range.
Applications
- Communications Equipment
- Consumer Products
- Servers
- Storage Equipment
Documentation
Data Sheet 1
Technical Articles 4
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 |
|---|---|---|---|
| MAX6620ATI+ | LFCSP | ||
| MAX6620ATI+T | LFCSP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 20, 2026 - 2571D PIN/ERRATA |
||
| MAX6620ATI+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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Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Fan Speed & Thermoelectric Cooler (TEC) Controllers 4 | ||
| MAX6650 | PRODUCTION | Fan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface |
| MAX6651 | LAST TIME BUY | Fan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface |
| MAX6660 | PRODUCTION | Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface |
| MAX6639 | PRODUCTION | 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller |
Tools & Simulations
Software Development 1
IBIS Model 1
Evaluation Kits
Evaluation Kit/Evaluation System for the MAX6620
Evaluation Kit/Evaluation System for the MAX6620
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