RICHTEK RT8816AGQW

The RT8816A is a 2/1 phase synchronous Buck PWM controller which is optimized for high performance graphic microprocessor and support nVidia OVR2 spec with PWMVID 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 Over-Voltage Protection (OVP), Under-Voltage Protection (UVP), current limit, and thermal shutdown into the WQFN-20L 3x3 package. The RT8816A adopts RDS(ON) current sensing technique. Current limit is accomplished through continuous inductorcurrent-sense, while RDS(ON) current sensing is used for accurate channel current balance. Using the method of current sampling utilizes the best advantages of each technique. The RT8816A features external reference input and PWMVID dynamic output voltage control, in which the feedback voltage is regulated and tracks external input reference voltage. Other features include adjustable switching frequency, dynamic phase number control, internal softstart, power good indicator, and enable functions.

• Dual-Phase PWM Controller
• Power State Indicator 1P-CCM/2P-CCM/1P-DEM/2P-DEM
• Two Embedded MOSFET Drivers and Embedded Switching Boot Diode
• Support 1.8V PWM-VID Interface
• External Reference Input Control
• PWM-VID Dynamic Voltage Control
• Dynamic Phase Number Control
• Lossless Rps(on) Current Sensing for Current Balance
• Internal/External Soft-Start
• Adjustable Current Limit Threshold
• Adjustable Switching Frequency
• UVP/OVP Protection
• Shoot Through Protection and Short Pulse Free Technology
• Support an Ultra-Low Output Voltage as Standby Voltage
• Thermal Shutdown
• Power Good Indicator (EN to PG high = 500μs)

• CPU/GPU Core Power Supply
• Desktop PC Memory, VTT Power
• Chipset/RAM Power Supply
• Generic DC-DC Power Regulator