Charge Pump Controller with Automatic Mode Transition


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The RT9397BF is a highly integrated step-up charge pump and inverting charge pump to generate positive and negative output voltage. The output voltages can be adjusted from ±4.5V to ±6V through external feedback resistors.

The part maintains highest efficiency by utilizing a x1.33/x1.5/x1.75/x2 mode fractional charge pump with automatic mode transition.

The RT9397BF is available in a WQFN-20L 3x3 package to achieve optimized solution for PCB space.


  • TFT-LCD Smart Phone Display
Key Spec.
Status Active
Vin (min) (V) 2.7
Vin (max) (V) 4.5
Number of Buck Converters 0
Number of Boost Converters 0
Number of Negative Outputs 1
Application LCD Bias
Features Enable Input;OVP;SCP;UVP
Package Type WQFN3x3-20
  • 2.7V to 4.5V Supply Voltage Range
  • Over 80% Average Efficiency of Battery Life
  • Support up to 50mA Output Current
  • Low 1μA Shutdown Current
  • Internal Soft-start Function
  • Short Circuit Protection Function
  • Over-Voltage Protection Function
  • Over-Temperature Protection Function
  • Charge Pump Controller with Automatic Mode Transition
  • Adaptive x1.33/x1.5/x1.75/x2 Charge Pump Mode Transition for Positive Voltage and x-1 for Negative Voltage
  • Low Input Noise and EMI
  • Output with Fast Discharge when IC shutdown
  • Adjustable Output Voltage Through External Feedback Resistor
  • Available in 20-Lead WQFN Package
TitleLast UpdateShareDownload
Charge Pump Controller with Automatic Mode Transition2019/04/10
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide (Oct., 2021)2021/11/02