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4A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter

RT6201A/RT6201B

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The RT6201A/B is a synchronous step-down DC/DC converter with Advanced Constant On-Time (ACOT®) mode control. It achieves high power density to deliver up to 4A output current from a 4.5V to 18V input supply. The proprietary ACOT® mode offers an optimal transient response over a wide range of loads and all kinds of ceramic capacitors, which allows the device to adopt very low ESR output capacitor for ensuring performance stabilization. In addition, RT6201A/B keeps an excellent constant switching frequency under line and load variation and the integrated synchronous power switches with the ACOT® mode operation provides high efficiency in whole output current load range. Cycle-by-cycle current limit provides an accurate protection by a valley detection of low side MOSFET and external soft-start setting eliminates input current surge during startup. Protection functions include thermal shutdown for RT6201A/B.

The RT6201A/B are available in the SOP-8 (Exposed Pad) package.

Applications

  • 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
Datasheet
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4A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter2013/10/23
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
Videos
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How to estimate control loop bandwidth from the transient response time?2017/03/30 783
Reference Design
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Richtek Load Transient Tool2019/01/09
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