The RT6220 is a synchronous Buck converter with Advanced Constant On-Time (ACOT® ) mode control, which provides a very fast transient response with no external compensators. The RT6220 operates from 4.5V to 23V input voltage, provides complete protection functions including Over Current Protection (OCP), Under Voltage Protection (UVP) and Over Voltage Protection (OVP). This IC also provides a 1.5ms internal soft-start function and an open-drain power good indicator.


  • Laptop Computers
  • Tablet PCs
  • Networking Systems
  • Servers
  • Personal Video Recorders
  • Flat Panel Television and Monitors
  • Distributed Power Systems
Key Spec.
RT6220A RT6220B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 23 23
Number of Outputs 1 1
Vout (min) (V) 0.6 0.6
Vout (max) (V) 5 5
Output Adj. Method Resistor Resistor
Iout (max) (A) 6 6
Current Limit (typ) (A) 9.5 9.5
Freq (typ) (kHz) 500 500
Ext Sync No No
Ron_HS (typ) (mOhm) 31 31
Ron_LS (typ) (mOhm) 20 20
Iq (typ) (mA) 0.1 0.11
Features ACOT Control;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;Internal Compensation;OCP;OTP;OVP;Power Good;SCP;Stable with Ceramic Capacitor;UVP ACOT Control;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;Internal Compensation;OCP;OTP;OVP;Power Good;SCP;Stable with Ceramic Capacitor;UVP
Package Type UQFN3x3-16(FC) UQFN3x3-16(FC)
  • 4.5V to 23V Input Voltage Range
  • Adjustable from 0.6V to 5V Output Range
  • Up to 98% Duty for 2S Battery Application
  • 500kHz Switching Frequency
  • ACOT® Mode Performs Fast Transient Response
  • Integrated MOSFETs
    ► 31mΩ of High-Side MOSFET
    ► 20mΩ of Low-Side MOSFET
  • Supports MLCC Output Capacitors
  • Internal Soft-Start (1.5ms typ)
  • Built-in OVP/UVP/OCP
  • Power Good Indicator
  • Thermal Shutdown
TitleLast UpdateDownload
6A, 23V, 500kHz, ACOT® Synchronous Buck Converter2016/06/27
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6220AGQUFUQFN3x3-16(FC)1500 Request Buy from Distributor
RT6220AHGQUFUQFN3x3-16(FC)1500 Request Buy from Distributor
RT6220BHGQUFUQFN3x3-16(FC)1500 Request Buy from Distributor