Dual Output LCD Bias for Smartphones and Tablets


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The RT4801T is a highly integrated Boost and LDO and inverting charge pump to generate positive and negative output voltage. The output voltages can be adjusted from ±4V to ±6V with 100mV steps by I2C interface protocols. With its input voltage range of 2.5V to 5.5V, the RT4801T is optimized for products powered by single-cell batteries and symmetrical output currents up to 150mA. The RT4801T is available in the WL-CSP-15B 1.31x2.07 (BSC) package.


  • TFT-LCD Smartphones
  • TFT-LCD Tablets
  • General Dual Power Supply Applications
Key Spec.
Status Active
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Number of Channels 2
Number of Buck Converters 0
Number of Boost Converters 1
Number of Negative Outputs 1
Number of LED Drivers 0
Number of LDO Regulators 1
Application LCD Bias
Features Enable Input;OCP;OVP;SCP
Package Type WL-CSP1.31x2.07-15(BSC)
  • 2.5V to 5.5V Supply Voltage Range
  • Up to 90% Efficiency with Small Magnetics
  • Support Up to 150mA Output Current
  • Low 1μA Shutdown Current
  • Internal Soft-start Function
  • Short Circuit Protection Function
  • Over-Voltage Protection Function
  • Over-Current Protection Function
  • Over-Temperature Protection Function
  • Elastic Positive and Negative Voltage On/Off Control by ENP/ENN
  • Voltage Output from 4V to 6V per 0.1V
  • Low Input Noise and EMI
  • Output with Programmable Fast Discharge when IC Shutdown
  • Adjustable Output Voltage by I2C Compatible Interface
  • Available in the 15-Ball WL-CSP Package
TitleLast UpdateShareDownload
Dual Output LCD Bias for Smartphones and Tablets2020/01/06
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30