I2C Fan Speed Controller with 4 High-Side Pre-Drivers
The Analog Devices MAX6620ATI+T is a dedicated fan speed controller that uses an I2C interface to manage up to four brushed DC fans. It integrates four high-side pre-drivers, meaning it handles the logic and gate drive for external N-channel MOSFETs rather than switching the motor current directly. This architecture keeps the heat dissipation off the controller and lets you scale the fan current by choosing the external FETs. The part operates from a 3V to 5.5V supply, which aligns with common 3.3V and 5V system rails found in telecom, server, and industrial equipment.
28-TQFN Package and Layout Considerations
The 28-WFQFN case footprint is standard; the datasheet layout recommendation shows a 0.5 mm pitch with the pad centered.