RT8720A

® RT8720A Single-Phase Full-Wave Fan Motor Driver General Description The RT8720A is a single-phase driver IC for fan motors. Rotation speed is controlled by supply voltage modulation and PWM input signal. The RT8720A 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 RT8720A 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 require- ments of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Marking Information 1U : Product Code 1UW W : Date Code Features  Low Supply Current  PWM Supply 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 PWM 9 5 FG UDFN-8SL 2x2 Simplified Application Circuit Supply Voltage Optional D1 D2 RT8720A VCC OUT2 C1 Pull-High Voltage PWM Control Signal RFG OUT1 FG H+ HB PWM HGND Singl...