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RT8749 Key Features

  • Embedded 256 x 16 Bits Flash Memory
  • Built-in Low RDS(ON) Power MOSFET
  • External PWM Speed Control
  • Wide Range External PWM Input Frequency
  • Built-in Frequency Generator with Selectable FG
  • Built-in Peak Current Limit
  • Built-in Motor Lock Protection and Automatic
  • Built-in Thermal Shutdown Protection
  • Low Power Standby Mode (when PWM Input is
  • RoHS pliant and Halogen Free

Related Richtek Datasheets

Part Number Description
RT8749A Digital Single-Phase Full Wave BLDC Fan Controller

RT8749 Description

The RT8749 is a highly integrated digital control IC for regulating single-phase full wave brushless DC (BLDC) fans at a programmed speed. The controller IC accepts a Pulse-Width Modulated (PWM) signal provided by the host, and decodes the duty-ratio of this PWM signal to 256 counts. The decoded duty-ratio will then be used for mapping to the programmed speed which is stored at the embedded flash memory.