Triple DC-DC Boost Converter for AMOLED


Update Alert Share

The RT4720AC 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 RT4720AC allows the use of low inductance inductor to save the board space. It provides dual positive output voltage, one is a fixed 5.8V or 7.7V output voltage by SEL pin and the other positive output is fixed 4.6V. For the negative output voltage, it 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. The RT4720AC has OTP, SCP, UVLO and over-current protections. The RT4720AC is available in a WQFN-16L 3x3 package to achieve saving PCB space.


  • Cellular Phones
  • Digital Cameras
  • 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
Features Fast Transient Response;OCP;SCP
Package Type WQFN3x3-16
  • Boost Converter to Supply Positive AVDD Voltage Fixed 5.8V or 7.7V
  • 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 50mA for Fixed 5.8V or 7.7V 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 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 AMOLED2018/03/27
Technical Documents
TitleLast UpdateShareDownload
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2018/11/15