8A, 23V Synchronous Step-Down Converter


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The RT6308A is an advanced constant on-time (ACOT®) mode synchronous buck converter. The main control loop of the RT6308A uses an advanced constant on-time (ACOT®) mode control which provides a very fast transient response. The RT6308A operates from 4.5V to 23V input voltage, and the output voltage can be programmed between 0.6V to 5.1V.


  • Industrial and Commercial Low Power Systems
  • Computer Peripherals
  • LCD Monitors and TVs
  • Green Electronics/Appliances
  • Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs
Key Spec.
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 23
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 5.1
Output Adj. Method Resistor
Iout (max) (A) 8
Current Limit (typ) (A) 12
Freq (typ) (kHz) 500
Ext Sync No
Ron_HS (typ) (mOhm) 20
Ron_LS (typ) (mOhm) 10
Iq (typ) (mA) 0.1
Features ACOT Control;Adjustable Current Limit;COT Control;Cycle-by-Cycle Current Limit;Enable Input;OCP;OTP;OVP;PSM;Power Good;Stable with Ceramic Capacitor;UVP;Ultrasonic Mode Control
Package Type UQFN3x3-12H(FC)
  • 4.5V to 23V Input Voltage Range 8A Output Current
  • ACOTTM Mode Performs Fast Transient Response
  • ACOTTM Architecture to Enable All MLCC Output Capacitor Usage
  • Fixed 500kHz Switching Frequency
  • High Efficient Internal Power MOSFET Switch-20mΩ (High Side) and 10mΩ (Low Side)
  • Adjustable Output Voltage from 0.6V to 5.1V
  • Pre-biased Soft-Start
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Thermal Shutdown Protection
  • Output Over/Under Voltage Protection
  • Ultrasonic Mode (USM)
TitleLast UpdateShareDownload
8A, 23V Synchronous Step-Down Converter2019/08/19
Technical Documents
TitleLast UpdateShareDownload
Richtek Selection Guide [Oct., 2020]2020/12/30