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Buck Converter

Overview
Documentation
Tools and Software
HW Evaluation Tools
Solutions
Key Products
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. Read more

Our products and solutions

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.

All resources

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Resource title
Latest update

Application Notes (5 of 18)

Resource title
Latest update
AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1
23 Apr 2021
23 Apr 2021
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
03 May 2021
03 May 2021
AN604 Calculation of conduction losses in a power rectifier 3.2
AN4021 Calculation of reverse losses in a power diode 1.0
03 May 2021
03 May 2021
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
03 May 2021
03 May 2021
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
03 May 2021
03 May 2021
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
23 Apr 2021
23 Apr 2021
AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0
03 May 2021
03 May 2021
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
03 May 2021
03 May 2021
AN533 SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting 3.6
AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
03 May 2021
03 May 2021
AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1
23 Apr 2021
23 Apr 2021
AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1
AN869 Tj max limit of Schottky diodes 2.2
03 May 2021
03 May 2021
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
23 Apr 2021
23 Apr 2021
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
17 May 2021
17 May 2021
A698x family High-performance automotive synchronous DC-DC converters 1.0
A798x, A597x switching regulators for car power management 1.0
25 May 2021
25 May 2021
A798x, A597x switching regulators for car power management 1.0
AST1S3x family Power optimization for postregulated automotive systems 1.0
15 Apr 2021
15 Apr 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
17 May 2021
17 May 2021
Linear and Switching Voltage Regulators Selection Guide 3.0

All tools & software

    • Part number
      		Status
      		Description
      		Type
      		Supplier

      ST Diode Finder

      Active

      Diode product finder application for Android and iOS

      		 Finders Apps ST
      ST Diode Finder

      Description:

      Diode product finder application for Android and iOS

All Hardware Evaluation Tools

    • Part Number
      		Description
      		Core product
      		Tool Type
      		Supplier
      		Sort by: part number

      AEK-POW-L5964V1
      Active

      Digitally controlled DC-DC converter with L5964 for automotive applications

      		 L5964 Automotive IC Eval Boards ST
      AEK-POW-L5964V1
      Active

      Digitally controlled DC-DC converter with L5964 for automotive applications

      STEVAL-1PS01AJR
      Active

      Evaluation board based on ST1PS01AJR 400 mA nano-quiescent synchronous step-down converter

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-1PS01AJR
      Active

      Evaluation board based on ST1PS01AJR 400 mA nano-quiescent synchronous step-down converter

      STEVAL-1PS01DJR
      Active

      Evaluation board based on ST1PS01DJR 400 mA nano-quiescent synchronous step-down converter

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-1PS01DJR
      Active

      Evaluation board based on ST1PS01DJR 400 mA nano-quiescent synchronous step-down converter

      STEVAL-1PS01EJR
      Active

      Evaluation board based on the ST1PS01EJR 400 mA nano-quiescent synchronous step-down converter

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-1PS01EJR
      Active

      Evaluation board based on the ST1PS01EJR 400 mA nano-quiescent synchronous step-down converter

      STEVAL-1PS02A
      Active

      Evaluation board based on ST1PS02AQTR 400 mA nano-quiescent synchronous step-down converter with AUX switch

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-1PS02A
      Active

      Evaluation board based on ST1PS02AQTR 400 mA nano-quiescent synchronous step-down converter with AUX switch

      STEVAL-1PS02C
      Active

      Evaluation board based on ST1PS02CQTR 400 mA nano-quiescent synchronous step-down converter with AUX switch

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-1PS02C
      Active

      Evaluation board based on ST1PS02CQTR 400 mA nano-quiescent synchronous step-down converter with AUX switch

      STEVAL-1PS02D
      Active

      Evaluation board based on ST1PS02DQTR 400 mA nano-quiescent synchronous step-down converter with AUX switch

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-1PS02D
      Active

      Evaluation board based on ST1PS02DQTR 400 mA nano-quiescent synchronous step-down converter with AUX switch

      STEVAL-ISA043V2
      Active

      1.5 A / 3.3 V high frequency synchronous buck converter demonstration board based on the ST1S06

      		 - DC-DC Converter -
      STEVAL-ISA043V2
      Active

      1.5 A / 3.3 V high frequency synchronous buck converter demonstration board based on the ST1S06

      STEVAL-ISA055V1
      Active

      0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX

      		 - DC-DC Converter -
      STEVAL-ISA055V1
      Active

      0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX

      STEVAL-ISA069V1
      Active

      3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in DFN 3x3 package

      		 ST1S31 DC-DC Converter -
      STEVAL-ISA069V1
      Active

      3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in DFN 3x3 package

      STEVAL-ISA082V1
      NRND

      4 A peak 800 kHz fixed-frequency PWM synchronous step-down demonstration board with enable on/off based on the ST1S40IPHR

      		 - DC-DC Converter -
      STEVAL-ISA082V1
      NRND

      4 A peak 800 kHz fixed-frequency PWM synchronous step-down demonstration board with enable on/off based on the ST1S40IPHR

      STEVAL-ISA094V1
      Active

      3 A step-down switching power supply demonstration board based on the L7981 (HSOP8)

      		 - DC-DC Converter -
      STEVAL-ISA094V1
      Active

      3 A step-down switching power supply demonstration board based on the L7981 (HSOP8)

      STEVAL-ISA095V1
      Active

      Up to 3 A step-down switching regulator based on the ST1S14

      		 ST1S14 DC-DC Converter ST
      STEVAL-ISA095V1
      Active

      Up to 3 A step-down switching regulator based on the ST1S14

      STEVAL-ISA099V1
      Active

      3 A step-down switching demonstration board based on the L7986 in DFN10 package

      		 L7986 DC-DC Converter -
      STEVAL-ISA099V1
      Active

      3 A step-down switching demonstration board based on the L7986 in DFN10 package

      STEVAL-ISA152V1
      Active

      3.3 V/3 A high efficiency step down DC-DC converter (VIN= 4.5 to 60 V) based on the L7987

      		 L7987 DC-DC Converter -
      STEVAL-ISA152V1
      Active

      3.3 V/3 A high efficiency step down DC-DC converter (VIN= 4.5 to 60 V) based on the L7987

      STEVAL-ISA158V1
      Active

      38 V - 2 A synchronous step-down switching regulator evaluation board based on the A6986

      		 A6986 DC-DC Converter ST
      STEVAL-ISA158V1
      Active

      38 V - 2 A synchronous step-down switching regulator evaluation board based on the A6986

      STEVAL-ISA205V1
      Active

      38 V, 2 A synchronous step-down switching regulator evaluation board based on the A6986H

      		 A6986H Automotive IC Eval Boards ST
      STEVAL-ISA205V1
      Active

      38 V, 2 A synchronous step-down switching regulator evaluation board based on the A6986H

      STEVAL-ISA207V1
      Active

      3 A step down DC/DC switching regulator (VIN = 4.5 V to 60 V) based on the A7987

      		 A7987 Automotive IC Eval Boards ST
      STEVAL-ISA207V1
      Active

      3 A step down DC/DC switching regulator (VIN = 4.5 V to 60 V) based on the A7987

      STEVAL-ISA208V1
      Active

      38 V, 3 A synchronous step-down switching regulator evaluation board based on the L6983CQTR

      		 - DC-DC Converter ST
      STEVAL-ISA208V1
      Active

      38 V, 3 A synchronous step-down switching regulator evaluation board based on the L6983CQTR

      STEVAL-ISA209V1
      Active

      38 V, 3 A synchronous step-down switching regulator evaluation board based on the L6983NQTR

      		 L6983 DC-DC Converter ST
      STEVAL-ISA209V1
      Active

      38 V, 3 A synchronous step-down switching regulator evaluation board based on the L6983NQTR

      STEVAL-L6981CDR
      Active

      38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981CDR

      		 - PSU and Converter Solution Eval Boards -
      STEVAL-L6981CDR
      Active

      38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981CDR

      STEVAL-L6981NDR
      Active

      38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981NDR

      		 - PSU and Converter Solution Eval Boards -
      STEVAL-L6981NDR
      Active

      38 V, 1.5 A synchronous step-down switching regulator evaluation board based on the L6981NDR

      STEVAL-L7983ADJ
      Active

      12 V/0.3 A step down DC/DC converter (VIN = 12 to 60 V) based on the L7983PUR regulator

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-L7983ADJ
      Active

      12 V/0.3 A step down DC/DC converter (VIN = 12 to 60 V) based on the L7983PUR regulator

      STEVAL-L7983V33
      Active

      3.3 V/0.3 A step down DC/DC converter (VIN = 3.5 V to 60 V) based on the L7983PU33R

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-L7983V33
      Active

      3.3 V/0.3 A step down DC/DC converter (VIN = 3.5 V to 60 V) based on the L7983PU33R

      STEVAL-L7983V50
      Active

      5.0 V / 0.3 A step down DC/DC converter (VIN = 5 to 60 V) based on the L7983PU50R regulator

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-L7983V50
      Active

      5.0 V / 0.3 A step down DC/DC converter (VIN = 5 to 60 V) based on the L7983PU50R regulator
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