5A, 36V, 500kHz Step-Down Converter


Update Alert Share

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.


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;Enable Input;Force PWM;Internal Compensation;OCP;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 UpdateShareDownload
5A, 36V, 500kHz Step-Down Converter2011/03/02
Title Last Update ShareDownload
5A, 36V, 500kHz Step-Down Converter 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Automotive Product Selection Guide2020/12/30
Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2020/12/30
Richtek Selection Guide [Oct., 2020]2020/12/30
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1357
Evaluation Boards
TitleLast UpdateShareDownload
RT8279 Step-Down Converter Evaluation Board2021/01/21
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8279GSPPSOP-82500 Not available Buy from Distributor