The RT2808A is a current mode asynchronous step-down converter that achieves excellent load and line regulation. Over a wide input voltage range from 5.5V to 36V and supports output current up to 3A. The Current mode operation provides fast transient response and eases loop stabilization.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 RT2808A requires a minimum number of readily available external components, providing a compact solution. The RT2808A provides protection functions inducing input under voltage lockout, cycle-by-cycle current limit, short circuit protection and thermal shutdown protection. The RT2808A 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) 3
Current Limit (typ) (A) 5.25
Freq (typ) (kHz) 500
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;SCP;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
  • 3A Output Current
  • Wide Operating Input Range 5.5V to 36V
  • Adjustable Output Voltage from 1.222V to 26V
  • High Efficiency up to 90%
  • Internal Compensation Minimizes External Parts Count
  • Internal Soft-Start
  • 110mΩ Internal Power MOSFET Switch
  • 25μA Shutdown Mode
  • Fixed 500kHz Frequency
  • Thermal Shutdown
  • Cycle-by-Cycle Current Limit
  • Available In an SOP-8 (Exposed Pad) Package
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
3A, 36V, 500kHz Current Mode Asynchronous Step-Down Converter2013/02/22
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