3A, 14V Step-Up DC-DC Converter


Update Alert Share

The RT8509 is a high performance switching boost converter that provides a regulated supply voltage for active matrix thin film transistor (TFT) liquid crystal displays (LCDs).

The RT8509 incorporates current mode, fixed-frequency, pulse width modulation (PWM) circuitry with a built in N-MOSFET to achieve high efficiency and fast transient response.

The RT8509 has a wide input voltage range from 2.8V to 14V. In addition, the output voltage can be adjusted up to 24V via an external resistive voltage divider. The maximum peak current is limited to 3.5A (typ.). Other features include programmable soft-start, over voltage protection, and over temperature protection.

The RT8509 is available in a WDFN-10L 3x3 package.


  • GIP TFT LCD Panels
Key Spec.
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 14
Vout (min) (V) 3.5
Vout (max) (V) 24
Output Adj. Method Resistor
Iq (typ) (mA) 1
SW Current Limit (typ) (A) 3.5
Freq (typ) (kHz) 1200
Freq (min) (kHz) 1000
Freq (max) (kHz) 1500
Ron (typ) (Ohm) 0.1
Features Adjustable Soft-Start;Enable Input;OCP;OVP
Package Type WDFN3x3-10
  • 90% Efficiency
  • Adjustable Output Up to 24V
  • 2.8V to 14V Input Supply Voltage
  • Input Supply Under Voltage Lockout
  • Fixed 1.2MHz Switching Frequency
  • Programmable Soft-Start
  • VOUT Over Voltage Protection
  • Over Temperature Protection
  • Thin 10-Lead WDFN Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
3A, 14V Step-Up DC-DC Converter2011/07/08
Technical Documents
TitleLast UpdateShareDownload
Power IC Solutions for IoT/Portable/Wearable/Battery-Powered Applications2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8509GQWWDFN3x3-101500 Not available Buy from Distributor