5A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter


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The RT6207A/B is a high-performance 650kHz, 5A step-down regulator with internal power switches and synchronous rectifiers. It features quick transient response using its Advanced Constant On-Time (ACOT®) control architecture that provides stable operation with small ceramic output capacitors and without complicated external compensation, among other benefits. The input voltage range is from 4.5V to 18V and the output is adjustable from 0.7V to 8V. The proprietary ACOT® control improves upon other fast response constant on-time architectures, achieving nearly constant switching frequency over line, load, and output voltage ranges. Since there is no internal clock, response to transients is nearly instantaneous and inductor current can ramp quickly to maintain output regulation without large bulk output capacitance. The RT6207A/B is stable with and optimized for ceramic output capacitors. With internal 60mΩ switches and 22mΩ synchronous rectifiers, the RT6207A/B displays excellent efficiency and good behavior across a range of applications, especially for low output voltages and low duty cycles. Cycle-by-cycle current limit provides protection against shorted outputs, input under-voltage lock-out, externally-adjustable soft-start, output under- and over-voltage protection, and thermal shutdown provide safe and smooth operation in all operating conditions. The RT6207A/B is available in the UQFN-13JL 2x3 (FC) package, with exposed thermal pad.


  • 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
  • Networked Communication
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5A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter2015/04/29
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
TitleLast UpdateShareViews
How to estimate control loop bandwidth from the transient response time?2017/03/30 786
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT6207AHGQUFUQFN2x3-13J(FC)1500 Not available Buy from Distributor
RT6207BHGQUFUQFN2x3-13J(FC)1500 Not available Buy from Distributor