The RT4809 is a DC-DC boost converter which is designed to provide the power of PWM controller. The RT4809 incorporates voltage mode, fixed-frequency, pulse width modulation (PWM) circuitry with a built in N-MOSFET to achieve high efficiency and fast transient response. The RT4809 input operating range is from 2.5V to 36V. The RT4809 is an optimized design for wide output voltage range applications.


  • USB PD and Programmable Power Adapters
Key Spec.
Status Active
Vin (min) (V) 3
Vin (max) (V) 36
Iq (typ) (mA) 0.22
VFB (typ) (V) 1.1
Freq (typ) (kHz) 1500
Duty (max) (%) 90
Features Cycle-by-Cycle Current Limit
Package Type SOT-26
  • Boost Converter to Supply PVO Voltage 11V
  • Cycle by Cycle Current Limit Protection
  • 2.5V to 36V Input Supply Voltage
  • Fixed 1.3MHz Switching Frequency
  • RoHS Compliant and Halogen Free
  • Input Supply Under-Voltage Protection
TitleLast UpdateDownload
DC-DC Boost Converter for PWM Controller2021/12/20