Triple DC-DC Boost Converter for AMOLED


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The RT4722C is a triple channels DC-DC converter which is designed to provide the power of AMOLED. It integrates step up DC-DC and an inverting converter to provide the positive and negative output voltage required by AMOLED.

For the portable application, board space and efficiency are always major concerns. The high switching frequency of the RT4722C allows the use of low inductance inductor to save the board space. For the negative and AVDD output voltage, both can be programmed by external MCU through single wire (SWIRE pin). The output voltage range of negative output voltage is −1.4V to −5.4V and AVDD voltage is 5.8V to 7.9V. RT4722C has OTP, SCP, UVLO and over-current protections. The RT4722C is available in a WQFN-16L 3x3 package to achieve saving PCB space.


  • AMOLED Panel
  • PDAs and Smart Phones
  • Probable Instrument
Key Spec.
Status Active
Vin (min) (V) 2.9
Vin (max) (V) 4.5
Number of Channels 3
Number of Buck Converters 0
Number of Boost Converters 2
Number of Negative Outputs 1
Number of LED Drivers 0
Number of LDO Regulators 0
Application OLED for Mobile
Features Current Mode Control;Cycle-by-Cycle Current Limit;Fast Transient Response;Internal Compensation;OCP;SCP
Package Type WQFN3x3-16
  • Boost Converter to Supply Positive AVDD Voltage from 5.8V to 7.9V
  • Boost Converter to Supply AMOLED Positive Voltage 4.6V
  • Inverter Converter to Supply AMOLED Negative Voltage from −1.4V to −5.4V
  • Maximum Output Current up to 300mA for AMOLED Positive & Negative Power Supply
  • Maximum Output Current up to 55mA for AVDD Output Voltage
  • Typical Peak Efficiency : 90% (40mA to 150mA)
  • PWM Mode @ 1.5MHz Switching Frequency
  • High Output Voltage Accuracy
  • Excellent Line and Load Transient
  • Excellent Line and Load Regulation
  • Programmable Negative and AVDD Voltage by SWIRE Pin
  • Fast Outputs Discharge Function
  • Low Quiescent Current < 1μA in Shutdown Mode
  • Internal Soft-Start to limit Inrush Current
  • Over-Temperature Protection (OTP)
  • Over-Current Protection (OCP)
  • Short Circuit Protection (SCP)
TitleLast UpdateShareDownload
Triple DC-DC Boost Converter for AMOLED2017/10/23
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide (Oct., 2021)2021/11/02