500mA, 80V, 350kHz Synchronous Step-Down Converter


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The RT6210 is a 80V, 500mA, 350kHz, high-efficiency, synchronous step-down DC-DC converter with an input-voltage range of 5.2V to 80V and a programmable output-voltage range of 0.8V to 72V. It features current-mode control to simplify external compensation and to optimize transient response with a wide range of inductors and output capacitors. High efficiency can be achieved through integrated N-MOSFETs, and pulse-skipping mode at light loads. With EN pin, power-up sequence can be more flexible and shutdown quiescent current can be reduced to < 3μA.

The RT6210 features cycle-by-cycle current limit for over-current protection against short-circuit outputs, and user-programmable soft-start time to prevent inrush current during startup. It also includes input under-voltage lockout, output under-voltage, and thermal shutdown protection to provide safe and smooth operation in all operating conditions.

The RT6210 is available in the SOP-8 (Exposed pad) package.


  • 4-20mA Loop-Powered Sensors
  • OBD-II Port Power Supplies
  • Low-Power Standby or Bias Voltage Supplies
  • Industrial Process Control, Metering, and Security Systems
  • High-Voltage LDO Replacement
  • Telecommunications Systems
  • Commercial Vehicle Power Supplies
  • General Purpose Wide Input Voltage Regulation
Key Spec.
Status Active
Vin (min) (V) 5.2
Vin (max) (V) 80
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 72
Preset Vout (V)
Output Adj. Method Resistor
Iout (max) (A) 0.5
Current Limit (typ) (A) 0.86
Freq (typ) (kHz) 350
Freq (min) (kHz)
Freq (max) (kHz)
Ext Sync No
Ron_HS (typ) (mOhm) 660
Ron_LS (typ) (mOhm) 330
Iq (typ) (mA) 0.6
Features Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;PSM;UVP
Package Type PSOP-8
  • 0.8V Feedback Reference Voltage with ±1.5% Accuracy
  • Wide Input Voltage Range : 5.2V to 80V
  • Output Current : 500mA
  • Integrated N-MOSFETs
  • Current-Mode Control
  • Fixed Switching Frequency : 350kHz
  • Programmable Output Voltage : 0.8V to 72V
  • Low < 3μA Shutdown Quiescent Current
  • Up to 92% Efficiency
  • Pulse-Skipping Mode for Light-Load Efficiency
  • Programmable Soft-Start Time
  • Cycle-by-Cycle Current Limit Protection
  • Input Under-Voltage Lockout, Output Under-Voltage and Thermal Shutdown Protection
TitleLast UpdateShareDownload
500mA, 80V, 350kHz Synchronous Step-Down Converter2017/06/15
Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2018/11/01
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6210GSPPSOP-82500 Request Buy from Distributor