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Buck Converter

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A buck or step-down topology is used in DC-DC switching converters where the output voltage is lower than the input with or without input-output isolation.

We have a large offer of buck converter ICs - with integrated power switches – and multi-phase, single-phase, multi-output controllers providing a wide range of features including soft start to minimize inrush current and power-good to enable power-up sequencing. Programmable devices are also available to help design buck converters fine-tuned for specific EMI, EMC, efficiency and power density targets and use cases.

We have also developed an isolated, single-stage direct 48 V to the Point-of-Load (PoL) resonant, conversion solution for use in CPUs or DDR memories compliant with Intel VR13 and VR12.5 specifications. ST also offers a fully scalable solution for up to 6 interleaved cells with dynamic cell shedding and pulse skipping features.

In addition, we have a comprehensive set of evaluation and development tools as well as reference designs to help compress time to market.

Buck converter circuit diagrams

buck converter circuit diagram

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Application Notes (5 of 18)

Resource title
Latest update
AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1
24 Mar 2020
24 Mar 2020
AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1
AN2025 CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION 1.1
13 Sep 2018
13 Sep 2018
AN2025 CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION 1.1
AN604 Calculation of conduction losses in a power rectifier 3.2
24 Mar 2020
24 Mar 2020
AN604 Calculation of conduction losses in a power rectifier 3.2
AN4021 Calculation of reverse losses in a power diode 1.0
24 Mar 2020
24 Mar 2020
AN4021 Calculation of reverse losses in a power diode 1.0
AN5028 Calculation of turn-off power losses generated by a ultrafast diode 1.0
13 Sep 2018
13 Sep 2018
AN5028 Calculation of turn-off power losses generated by a ultrafast diode 1.0
AN4381 Current sharing in parallel diodes 1.0
24 Mar 2020
24 Mar 2020
AN4381 Current sharing in parallel diodes 1.0
AN3267 Impact of power MOSFET VGS on buck converter performance 1.2
13 Sep 2018
13 Sep 2018
AN3267 Impact of power MOSFET VGS on buck converter performance 1.2
AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1
24 Mar 2020
24 Mar 2020
AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1
AN4391 New P-channel trench technology from ST for low power DC-DC conversions and load switching applications 1.0
13 Sep 2018
13 Sep 2018
AN4391 New P-channel trench technology from ST for low power DC-DC conversions and load switching applications 1.0
AN4150 Power MOSFET technology gate current needs in a synchronous buck converter 1.2
07 Jan 2019
07 Jan 2019
AN4150 Power MOSFET technology gate current needs in a synchronous buck converter 1.2
AN4191 Power MOSFET: Rg impact on applications 1.2
07 Jan 2019
07 Jan 2019
AN4191 Power MOSFET: Rg impact on applications 1.2
AN4192 Power MOSFETs: best choice guide for VRM application 1.0
13 Sep 2018
13 Sep 2018
AN4192 Power MOSFETs: best choice guide for VRM application 1.0
AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
24 Mar 2020
24 Mar 2020
AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0
24 Mar 2020
24 Mar 2020
AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0
AN533 SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting 3.6
24 Mar 2020
24 Mar 2020
AN533 SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting 3.6
AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
24 Mar 2020
24 Mar 2020
AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1
13 Sep 2018
13 Sep 2018
AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1
AN869 Tj max limit of Schottky diodes 2.2
24 Mar 2020
24 Mar 2020
AN869 Tj max limit of Schottky diodes 2.2
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Design Notes & Tips (2)

Resource title
Latest update
DN0010 Adapting ST power line modem evaluation boards to communicate over a DC bus 1.2
16 Jul 2019
16 Jul 2019
DN0010 Adapting ST power line modem evaluation boards to communicate over a DC bus 1.2
DN0011 ST1S03 alternative topology: Using a buck in a negative buck-boost configuration 1.2
16 Jul 2019
16 Jul 2019
DN0011 ST1S03 alternative topology: Using a buck in a negative buck-boost configuration 1.2

Flyers (3)

Resource title
Latest update
A698x family High-performance automotive synchronous DC-DC converters 1.0
23 Dec 2020
23 Dec 2020
A698x family High-performance automotive synchronous DC-DC converters 1.0
A798x, A597x switching regulators for car power management 1.0
04 Jan 2021
04 Jan 2021
A798x, A597x switching regulators for car power management 1.0
AST1S3x family Power optimization for postregulated automotive systems 1.0
04 Jan 2021
04 Jan 2021
AST1S3x family Power optimization for postregulated automotive systems 1.0

Selection Guides (1)

Resource title
Latest update
Linear and Switching Voltage Regulators Selection Guide 3.0
04 Jan 2021
04 Jan 2021
Linear and Switching Voltage Regulators Selection Guide 3.0

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      ST Diode Finder

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      ST Diode Finder

      Description:

      Diode product finder application for Android and iOS

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.