5A, 30V, 500kHz Asynchronous Step-Down Converter


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The RT6285 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 RT6285 provides cycle-by-cycle current limiting and thermal shutdown protection. The soft-start reduces the stress on the input source at startup. In shutdown mode, the regulator draws only 25μA of supply current.

The RT6285 requires a minimum number of readily available external components, providing a compact solution. The RT6285 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) 30
Number of Outputs 1
Vout (min) (V) 1.222
Vout (max) (V) 24
Output Adj. Method Resistor
Iout (max) (A) 5
Current Limit (typ) (A) 7.5
Freq (typ) (kHz) 500
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 30V Operating Input Range
  • Adjustable Output Voltage from 1.222V to 24V
  • Available In an SOP8 (Exposed Pad) Package
  • Integrated Boot Recharge FET
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
5A, 30V, 500kHz Asynchronous Step-Down Converter2020/01/14
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30