The RT8279 is a step-down regulator with an internal power MOSFET. It achieves 5A of continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization.
For protection, the RT8279 provides cycle-by-cycle current limiting and thermal shutdown protection. An adjustable soft-start reduces the stress on the input source at startup. In shutdown mode, the regulator draws only 25μA of supply current.
The RT8279 requires a minimum number of readily available external components, providing a compact solution. The RT8279 is available in the SOP-8 (Exposed Pad) package.


  • Distributive Power Systems
  • Battery Charger
  • DSL Modems
  • Pre-regulator for Linear Regulators
Key Spec.
Status Active
Vin (min) (V) 5.5
Vin (max) (V) 36
Number of Outputs 1
Vout (min) (V) 1.222
Vout (max) (V) 26
Output Adj. Method Resistor
Iout (max) (A) 5
Current Limit (typ) (A) 7.5
Freq (typ) (kHz) 500
Freq (min) (kHz) 425
Freq (max) (kHz) 575
Ext Sync No
Ron_HS (typ) (mOhm) 110
Iq (typ) (mA) 0.6
Features Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;Internal Compensation;OCP;OTP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
  • 5A Output Current
  • Internal Soft-Start
  • 110mΩ Internal Power MOSFET Switch
  • Internal Compensation Minimizes External Parts Count
  • High Efficiency up to 90%
  • 25μA Shutdown Mode
  • Fixed 500kHz Frequency
  • Thermal Shutdown
  • Cycle-by-Cycle Over Current Protection
  • Wide 5.5V to 36V Operating Input Range
  • Adjustable Output Voltage from 1.222V to 26V
  • Available In an SOP8 (Exposed Pad) Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
5A, 36V, 500kHz Step-Down Converter2016/09/05
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Richtek Featured Product Tree [Aug., 2023] Selection Guide2023/08/07
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8279GSPPSOP-82500 Request Buy from Distributor