The RT6203E is an adaptive on-time mode synchronous Buck converter. The main control loop of the RT6203E uses an adaptive on-time mode control which provides a very fast transient response with no external components. The RT6203E operates from 4.5V to 18V VIN input. After the initial power-up, the output voltage can be changed by codes sent into the IC via an I2C compatible VID control bus. There are special codes which can be used to program current limit level and thermal shutdown level. Shutdown and startup can be also programmed by special codes. The device also features an internal soft-start time. Output voltage is adjustable by VID code setting. VOUT range is between 0.6V to 1.62V


  • 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) 18
Number of Outputs 1
Vout (min) (V) 0.6
Vout (max) (V) 1.62
Output Adj. Method Digital
Iout (max) (A) 6
Current Limit (typ) (A) 10;4.3;7.15
Freq (typ) (kHz) 700
Ext Sync No
Ron_HS (typ) (mOhm) 48
Ron_LS (typ) (mOhm) 25
Iq (typ) (mA) 0.55
Features ACOT Control;Adjustable Current Limit;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;I2C;OCP;OTP;PSM;Stable with Ceramic Capacitor
Package Type PSOP-8
  • VID Control Range Via I2C Compatible Interface :
    ► 0.6V to 0.7V in 20mV Steps
    ► 0.7V to 1.2V in 10mV Steps
    ► 1.2V to 1.62V in 20mV Steps
  • Adjustable Current Limit
  • Adjustable Thermal Shutdown
  • Fast Transient Response
  • Steady 700kHz Switching Frequency
  • Optimized for All Ceramic Capacitors
  • Internal Soft-Start
  • Input Under-Voltage Lockout
  • Thermal Shutdown
  • RoHS Compliant and Halogen Free
TitleLast UpdateDownload
6A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter with VID Control2018/11/28
Reference Design
TitleLast UpdateDownload
Richtek Load Transient Tool2022/07/25
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6203ENGSPPSOP-82500 Request Buy from Distributor