3A Peak, 18V, 500kHz, ACOTTM Step-Down Converter


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The RT6213A/B is a high-efficiency, monolithic synchronous step-down DC-DC converter that can deliver up to 3A peak output current from a 4.5V to 18V input supply. The RT6213A/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.


  • Set-Top Boxes
  • Portable TVs
  • Access Point Routers
  • DSL Modems
  • LCD TVs
Key Spec.
RT6213A RT6213B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 18 18
Number of Outputs 1 1
Vout (min) (V) 0.8 0.8
Vout (max) (V) 5 5
Output Adj. Method Resistor Resistor
Iout (max) (A) 3 3
Current Limit (typ) (A) 3.8 3.8
Freq (typ) (kHz) 500 500
Ext Sync No No
Ron_HS (typ) (mOhm) 150 150
Ron_LS (typ) (mOhm) 70 70
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 150mΩ/70mΩ MOSFETs
  • 4.5V to 18V Supply Voltage Range
  • 500kHz Switching Frequency
  • ACOT Control
  • 0.8V ± 1.5% Voltage Reference
  • Internal Start-Up into Pre-biased Outputs
  • Compact Package: TSOT-23-6 pin
  • Input Under-Voltage Lockout
  • Over-Current Protection and Hiccup
TitleLast UpdateShareDownload
3A Peak, 18V, 500kHz, ACOTTM Step-Down Converter2014/11/11
Technical Documents
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ACOT™ (Advanced Constant-On Time) Synchronous Step-Down Converters2020/12/30
ACOT® Stability Testing2020/04/13
The Calculation of Output DC Offset for ACOT™ Control Buck Converter with Feed-forward Compensator2019/12/12
Comparing Buck Converter Topologies2019/12/12
Buck Converter Selection Criteria2019/12/12
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 1379
Reference Design
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Richtek Load Transient Tool2021/01/21
Design Tool
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Richtek Designer™ Web Simulation Tool : RT6213AHGJ6F2020/09/23
Richtek Designer™ Web Simulation Tool : RT6213BHGJ6F2020/09/23
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6213AHGJ6FTSOT-26(FC)3000 Not available Buy from Distributor
RT6213BHGJ6FTSOT-26(FC)3000 Not available Buy from Distributor