The RT8816A is a 2/1-phase synchronous Buck PWM controller optimized for high-performance graphic microprocessors and supports the nVidia OVR2 specification with a PWM-VID interface. The IC integrates a Constant-On-Time (COT) PWM controller, two MOSFET drivers with internal bootstrap diodes, as well as channel current balance and protection functions, including overvoltage protection (OVP), undervoltage protection (UVP), current limit, and thermal shutdown, all within a WQFN-20L 3x3 package.
The RT8816A adopts an RDS(ON) current sensing technique for current limit, which is accomplished through continuous inductor current sensing, while RDS(ON) current sensing is used for accurate channel current balance. This method of current sampling utilizes the best advantages of each technique.
Features of the RT8816A include an external reference input and PWM-VID dynamic output voltage control, where the feedback voltage is regulated to track an external input reference voltage. Other features include an adjustable switching frequency, dynamic phase number control, internal soft start, power good indicator, and enable functions. The recommended junction temperature range is -10°C to 105°C.
Applications
- CPU/GPU Core Power Supply
- Desktop PC Memory, VTT Power
- Chipset/RAM Power Supply
- Generic DC-DC Power Regulator