Single Phase PWM Controller with 1-bit VID


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RT8121 is a single phase PWM buck controller with one integrated MOSFET driver for advanced microprocessor application as VR12 VCCIO power. This controller maintains the same features as the multi-phase product family, but reduces the output to one phase for lower current systems. Features of this controller include adjustable operation frequency, power good indication, external error-amp compensation, over voltage protection, over current protection, externally adjustable offset voltage, load transient enhancement (quick response), and enable/shutdown control to achieve optimal power management solution for various applications. The RT8121 comes in the WQFN-20L 3x3 package.


  • VR12 VCCIO Voltage Regulator
  • Low Voltage, High Current DC/DC Converter
Key Spec.
Status Active
Vs (typ) (V) 12
Vin (min) (V) 4.5
Vin (max) (V) 13.2
Vout (min) (V) 0.8
Vout (max) (V) 5
Preset Vout (V)
Output Adj. Method Resistor
Accuracy (+/- %) 0.5
Freq (typ) (kHz) 200
Freq (min) (kHz) 180
Freq (max) (kHz) 220
Iq (typ) (mA) 6
Ext Sync No
Features Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;DCR Current Sense;Droop Control;Force PWM;OCP;OVP;Power Good;SCP;Voltage Mode Control
Package Type WQFN3x3-20
  • Single Phase Power Conversion
  • One Embedded MOSFET Driver with Internal Bootstrap Diode
  • 1-bit VID Table for VR12 VCCIO
  • Continuous Differential Inductor DCR Current Sense
  • Adjustable Soft-Start
  • Adjustable Frequency Typically at 200kHz
  • Power Good Indication
  • Adjustable Over Current Protection
  • Over Voltage Protection
  • Over Temperature Protection
  • Small 20-Lead WQFN Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
Single Phase PWM Controller with 1-bit VID2010/05/31
Title Last Update ShareDownload
Single Phase PWM Controller with 1-bit VID 2015/05/19
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8121GQWWQFN3x3-201500 Not available Buy from Distributor