Multi-Phase PWM Controller with PWM-VID Reference


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The RT8813A is a 3/2/1 phase synchronous Buck PWM controller which is optimized for high performance graphic microprocessor and support nVidia OVR2+1 spec with 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 Over Voltage Protection (OVP), Under Voltage Protection (UVP), current limit, and thermal shutdown into the WQFN-24L 4x4 package.

The RT8813A adopts RDS(ON) current sensing technique. Current limit is accomplished through continuous inductor-current-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 RT8813A features external reference input and PWM-VID 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/external soft-start, power good indicator, and enable functions.


  • CPU/GPU Core Power Supply
  • Notebook PC Memory Power Supply
  • Chipset/RAM Power Supply
  • Generic DC-DC Power Regulator
Key Spec.
Status Active
Vs (typ) (V) 5
Vin (min) (V) 5.5
Vin (max) (V) 26
Vout (min) (V) 0.3
Vout (max) (V) 2
Output Adj. Method Ext Vref;Resistor
Accuracy (+/- %) 1
Freq (min) (kHz) 150
Freq (max) (kHz) 600
Iq (typ) (mA) 1.5
Ext Sync No
Features Adjustable Current Limit;Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Enable Input;OCP;OVP;PSM;Power Good;SCP;Selectable (PSM or PWM);UVP
Package Type WQFN4x4-24
  • Multi-Phase PWM Controller
  • Two Embedded MOSFET Drivers and Embedded Switching Boot Diode
  • External Reference Input Control
  • PWM-VID Dynamic Voltage Control
  • Dynamic Phase Number Control
  • Lossless RDS(ON) Current Sensing for Current Balance
  • Internal Fixed and External Adjustable 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 Alert Indicator in 2/1 Active Phase Application
  • Thermal Shutdown
  • Power Good Indicator
  • RoHS Compliant and Halogen Free
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Multi-Phase PWM Controller with PWM-VID Reference2013/01/17