The FA6620 is a high-efficiency power management control IC that is specified for the TV platform. The FA6620 is used with a 12V power supply and a 5V standby power supply; besides, it integrates two synchronous PWM controllers, one regulator, monitoring, and control functions into a 40 pin QFN package.
A brief analog block description of the FA6620 describes here. LDO provides an output current of 350mA with an output voltage of 3.3V ±2%. PWM1 and PWM2 are the synchronous buck DC/DC controllers with a constant-on-time control scheme that provides a fast response to load transients while maintaining a relatively constant switching frequency. PWMVDD3V is the asynchronous buck DC/DC converter which provides up to 200mA output current.
The high-performance digital block consists of power sequence interval time controlled by DT pin, monitoring and protection functions, LED function controlled by the host via I2C interface, and provides an adjustable linear controller mechanism for dynamic over-current/under-voltage usage.
The FA6620 provides two working modes. In the normal mode, it works with a system that supplies 12V power and a 5V standby power. In the suspend mode, it works by supplying 5V standby power or a 12V power supply only system; besides, it can wake up the TV system from the suspend mode by KEYPAD/IR/CEC function.