RT8720B

® RT8720B Single-Phase Full-Wave Fan Motor Driver General Description The RT8720B is a single-phase driver IC for fan motors. Rotation speed is controlled by supply voltage modulation. In the supply voltage control application, the fan speed slope is adjustable by the external voltage input. The RT8720B provides several protection features including lock protection, thermal shutdown, over-current protection and under-voltage protection. In thermal shutdown mode, the supply current is less than 100μA. The rotation frequency is generated by FG output. Ordering Information RT8720B Package Type QU : UDFN-8SL 2x2 (U-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Marking Information 1V : Product Code 1VW W : Date Code Features  Low Supply Current  Adjustable Voltage Control Fan Speed  Supply Voltage Speed Control  Smart Force Start-up Function  Built-in Lock Protection  Built-in Thermal Shutdown  Built-in Over-Current Protection  Built-in Frequency Generator with FG Output Signal  Include Hall Bias Circuit  RoHS Compliant and Halogen Free Applications  Single-Phase Fan Motor for Notebook or PC Pin Configurations (TOP VIEW) OUT2 H+ HB H- 1 2 3 4 GND 8 OUT1 7 VCC 6 SET 9 5 FG UDFN-8SL 2x2 Simplified Application Circuit Supply Voltage Optional D1 D2 RT8720B VCC OUT2 ...