TC648BEOA

The TC648BEOA from Microchip Technology is a switch-mode fan speed controller that utilizes pulse width modulation (PWM) for temperature-proportional speed control. This feature contributes to acoustic noise reduction and extends fan life. The device supports a supply voltage range of 3.0V to 5.5V, with the fan voltage being independent of the controller's supply voltage, allowing it to support any fan voltage.

Designed for applications requiring precise thermal management, the TC648BEOA incorporates features such as automatic shutdown mode for energy efficiency and an integrated start-up timer for reliable fan motor operation. It operates effectively within a temperature range of -40°C to +85°C. The device is available in a space-saving 8-pin MSOP package, suitable for compact designs.

Key functionalities include temperature-proportional speed control via a thermistor or other voltage output temperature sensor, and an auto-shutdown threshold set by a resistor divider. The controller ensures reliable fan start-up after power-on, shutdown mode, or transient faults. A logic low on the VIN pin initiates fan shutdown. The TC648BEOA is well-suited for personal computers, servers, LCD projectors, datacom, telecom equipment, and general-purpose fan speed control applications.