2A, 18V, 500kHz, ACOT® Step-Down Converter


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The RT6212A/B is a high-efficiency, monolithic synchronous step-down DC-DC converter that can deliver up to 2A output current from a 4.5V to 18V input supply. The RT6212A/B adopts ACOT architecture to allow the transient response to be improved and keep in constant frequency. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under-voltage protection, output over-current protection, and thermal shutdown.


Key Spec.
RT6212A RT6212B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 18 18
Number of Outputs 1 1
Vout (min) (V) 0.765;0.8 0.765;0.8
Vout (max) (V) 6.5 6.5
Output Adj. Method Resistor Resistor
Iout (max) (A) 2 2
Current Limit (typ) (A) 3.3 3.3
Freq (typ) (kHz) 500 500
Ext Sync No No
Ron_HS (typ) (mOhm) 163 163
Ron_LS (typ) (mOhm) 86 86
Iq (typ) (mA) 0.5 0.5
Features ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Internal Compensation;OCP;OVP;PSM;Stable with Ceramic Capacitor;UVP ACOT Control;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;Internal Compensation;OCP;OVP;Stable with Ceramic Capacitor;UVP
Package Type TSOT-26(FC) TSOT-26(FC)
  • Integrated 163mΩ/86mΩ MOSFETs
  • 4.5V to 18V Supply Voltage Range
  • 500kHz Switching Frequency
  • ACOT Control
  • Feedback Reference Voltage 0.8V ± 1.5%
  • Feedback Reference Voltage 0.765V ± 1.5%
  • Internal Start-Up into Pre-Biased Outputs
  • Compact Package : TSOT-23-6 Pin
  • Input Under-Voltage Lockout
  • Over-Current Protection and Hiccup
TitleLast UpdateShareDownload
2A, 18V, 500kHz, ACOT® Step-Down Converter2014/11/11
Technical Documents
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ACOT® Stability Testing2020/04/13
The Calculation of Output DC Offset for ACOT™ Control Buck Converter with Feed-forward Compensator2019/12/12
ACOT™ (Advanced Constant-On Time) Synchronous Step-Down Converters2019/12/12
Comparing Buck Converter Topologies2019/12/12
Buck Converter Selection Criteria2019/12/12
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How to estimate control loop bandwidth from the transient response time?2017/03/30 783
Evaluation Boards
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2A, 18V, 500kHz, ACOT™ Step-Down Converter2018/11/08
Reference Design
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Richtek Load Transient Tool2019/01/09
Design Tool
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Richtek Designer™ Web Simulation Tool : RT6212AHGJ6F2020/02/05
Richtek Designer™ Web Simulation Tool : RT6212BHGJ6F2020/02/05
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6212AHGJ6FTSOT-26(FC)3000 Request Buy from Distributor
RT6212BHGJ6FTSOT-26(FC)3000 Not available Buy from Distributor