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Step-Down (Buck) Converters

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Richtek Buck Product Family

  • Current Mode Buck converters

  • CMCOT Buck converters

  • ACOT product family

    The proprietary ACOT control scheme not only features ultra-fast transient response but also improves upon legacy constant on-time architectures, achieving constant average frequency over line, load and output ranges to minimize interference and noise problems. The ACOT Buck converters are stable with and optimized for ceramic output capacitors without external components or external ripple injection scheme. The ACOT family includes latch-off, hiccup and constant current protection modes. Richtek has introduced the whole range of ACOT Buck converters up to 12A output current capacity and the input range is from 4.5V to 23V. The ACOT Buck converters are ideal for Set Top Boxes, industrial and commercial low power systems, computer peripherals and LCD Monitors and TVs. See the list of ACOT products.
  • Wide Input Voltage Range DC-DC power solutions for industrial, Automotive and LED lighting applications

    Richtek offers comprehensive power conversion solutions for input voltages ranging up to 60V, suitable for a wide range of applications in the industrial, automotive, and professional lighting field. The key features for Buck converter parts in wide input range are: Robust control architectures for coping with noisy environments, PGOOD and adjustable Soft-start for power sequencing, thermally enhanced packages for operation in higher ambient temperatures, and fully stable with all ceramic input and output capacitors for extended operation life time. We also offer products qualified over -40°C to 85°C industrial temperature range as well as automotive AEC-Q100 standard qualified parts. See the list of selected products.



The following is a list of products released in the last

Part NumberDescriptionShareDatasheetFree Sample
RTQ2159-QA8A, 6.5V, 2.1MHz, ACOT® Synchronous Step-Down Converter with I2C Interface Not available
RTQ2158-QA8A, 6.5V, 2.1MHz Synchronous Step-Down Converter Not available
RTQ2943-QA42VIN, 3.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ2945-QA42VIN, 5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ2942-QA42VIN, 2.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ2941-QA42VIN, 1.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RT6280A/RT6280B23V, 10A, 500kHz ACOT® Synchronous Step-Down Converter Not available
RTQ2940-QA42VIN, 0.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ2962-QA60VIN, 2.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ2960-QA60VIN, 0.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ2961-QA60VIN, 1.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ2963-QA60VIN, 3.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ2965-QA60VIN, 5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RT5752A/RT5752B2A, 1.2MHz, 5.5V Synchronous Step-Down Converter InTSOT-23-5/TSOT-23-6 Not available
RTQ2134-QA2.1MHz, 20A Multi-Phase Step-Down Converter with I2C Interface Not available
RT5753A/RT5753B3A, 1.2MHz, 5.5V Synchronous Step-Down Converter In WDFN-8L 2x2 Request
RT5751A/RT5751B6V 1A, ACOT® Buck Converter Request
RT5761A/RT5761B6V 1A, ACOT® Buck Converter in Thin UDFN-6L 1.4x1 Package Not available
RT5750A/RT5750B6V 1A, ACOT® Buck Converter Request
RT62306A, 23V, 500kHz, ACOT® Synchronous Buck Converter Request
RT6262A/RT6262B17V Input, 2A, ACOT® Buck Converter with Both FETs OC Protection Not available
RT6274C/RT6274D18V Input, 3.5A, ACOT® Buck Converter with Both FETs OC Protection Not available
RT5760A/RT5760B/RT5760C/RT5760D6V 1A, ACOT® Buck Converter in Thin SOT-563 Package Request
RT62855A, 30V, 500kHz Asynchronous Step-Down Converter Not available
RT6258BH/RT6258CH8A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO Not available
RT6263A/RT6263B17V Input, 3A, ACOT® Buck Converter with Both FETs OC Protection Not available
RTQ634542VIN, 5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ634342VIN, 3.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RT6272A/RT6272B17V Input, 2A, ACOT® Buck Converter with Both FETs OC Protection Not available
RT6273A/RT6273B17V Input, 3A, ACOT® Buck Converter with Both FETs OC Protection Not available
RT6256BH/RT6256CH6A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO Not available
RTQ636560VIN, 5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RT58002.1MHz, 3 CHs, Step-Down Converter with I2C Interface Not available
RTQ636060VIN, 0.5A, Asynchronous Step-Down Converter with Low Quiescent Current Request
RTQ634042VIN, 0.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ636160VIN, 1.5A, Asynchronous Step-Down Converter with Low Quiescent Current Request
RTQ634242VIN, 2.5A, Asynchronous Step-Down Converter with Low Quiescent Current Not available
RTQ636360VIN, 3.5A, Asynchronous Step-Down Converter with Low Quiescent Current