Buck and Buck-Boost Converter

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Off-line converters based on buck, or step-down, and buck-boost, or step-down/up, topologies convert the mains to a regulated DC output, either positive or negative, without the need for an isolation transformer by modulating the duty cycle of the power switch. The waveform of the current in the inductor defines the converter’s mode of operation that can be continuous when the current in the inductor never drops to zero, or discontinuous when the said current stays at zero for a given time interval – and boundary or transition mode when the inductor current is zero at a single point. Both topologies can use a low-cost inductor for energy storage and the transfer from input to output.

Our products and solutions

Our VIPerPlus high-voltage converters help design high-efficiency, cost-effective off-line buck and buck-boost converters with a minimum component count and enhanced reliability thanks to a set of features including pulse skip protection that can help reduce peak current at start-up allowing the use of smaller, less expensive inductors.

In addition, we provide an extensive set evaluation and development boards as well as reference designs.

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VIPerPlus AC-DC high-voltage converters

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	Resource title	Version	Latest update
PDF	AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family	4.2	05 Apr 2022	05 Apr 2022 AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family 4.2
PDF	AN5865 High power inverse buck for dimmable LED application with MASTERGAN4, HVLED002 and VIPER06XS	1.0	10 Nov 2022	10 Nov 2022 AN5865 High power inverse buck for dimmable LED application with MASTERGAN4, HVLED002 and VIPER06XS 1.0
PDF	AN4273 STEVAL-ISA114V1: 5 V / 0.8 W 30 kHz buck with the VIPer06XS	3.0	13 Sep 2018	13 Sep 2018 AN4273 STEVAL-ISA114V1: 5 V / 0.8 W 30 kHz buck with the VIPer06XS 3.0
PDF	AN4562 STEVAL-ISA116V1: 5 W, 2 output wide range buck converter based on the VIPER26LD	1.0	13 Sep 2018	13 Sep 2018 AN4562 STEVAL-ISA116V1: 5 W, 2 output wide range buck converter based on the VIPER26LD 1.0
PDF	AN4345 STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD	1.0	13 Sep 2018	13 Sep 2018 AN4345 STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD 1.0
PDF	AN4858 STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01	1.0	05 Apr 2022	05 Apr 2022 AN4858 STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01 1.0
PDF	AN4857 STEVAL-ISA179V1 15 V/2.25 W 60 kHz buck demo with VIPer0P	1.0	13 Sep 2018	13 Sep 2018 AN4857 STEVAL-ISA179V1 15 V/2.25 W 60 kHz buck demo with VIPer0P 1.0
PDF	AN2872 Super wide-range buck converter based on the VIPer16	1.2	22 Jan 2020	22 Jan 2020 AN2872 Super wide-range buck converter based on the VIPer16 1.2

	Resource title	Version	Latest update
PDF	TA0363 3 V input, 70 V output, fully integrated hybrid charge pump	1.0	27 Sep 2022	27 Sep 2022 TA0363 3 V input, 70 V output, fully integrated hybrid charge pump 1.0

	Resource title	Version	Latest update
PDF	UM1470 STEVAL-ISA096V1 -12 V/150 mA adaptable buck-boost converter	1.0	13 Sep 2018	13 Sep 2018 UM1470 STEVAL-ISA096V1 -12 V/150 mA adaptable buck-boost converter 1.0

	Resource title	Version	Latest update
PDF	DN0009 VIPer06X buck regulator, 12V 140 mA	1.2	16 Jul 2019	16 Jul 2019 DN0009 VIPer06X buck regulator, 12V 140 mA 1.2

	Resource title	Version	Latest update
PDF	SOD128Flat power Schottky diodes for improved cost and space-savings	1.0	10 Sep 2018	10 Sep 2018 SOD128Flat power Schottky diodes for improved cost and space-savings 1.0

	Resource title	Version	Latest update
PDF	VIPer give a boost to your SMPS design	08.2022	17 Aug 2022	17 Aug 2022 VIPer give a boost to your SMPS design 08.2022

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Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu	ST Diode Finder	Active	Diode product finder application for Android and iOS	Finder Apps	ST	ST Diode Finder Description: Diode product finder application for Android and iOS
Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu	ST Voltage Regulator Finder	Active	Linear and switching voltage regulators and voltage reference applications for smartphones and tablets	Finder Apps	ST	ST Voltage Regulator Finder Description: Linear and switching voltage regulators and voltage reference applications for smartphones and tablets

All Hardware Evaluation Tools

Evaluation Tools

Part Number	Description	Core product	Tool Type	Supplier	Sort by: part number
STEVAL-ISA010V1 Active	Ultra wide range dual output back converter demonstration board based on the VIPER16	-	AC-DC Converter	-	STEVAL-ISA010V1 Active Ultra wide range dual output back converter demonstration board based on the VIPER16
STEVAL-ISA096V1 Active	Auxiliary power supply in buck-boost topology based on the Viper06	VIPER06	AC-DC Converter	-	STEVAL-ISA096V1 Active Auxiliary power supply in buck-boost topology based on the Viper06
STEVAL-ISA114V1 Active	5 V/0.8 W wide-range 30 kHz buck converter based on the VIPer06XS	-	AC-DC Converter	ST	STEVAL-ISA114V1 Active 5 V/0.8 W wide-range 30 kHz buck converter based on the VIPer06XS
STEVAL-ISA115V1 Active	12 V, 150 mA non-isolated buck converter using VIPer™ Plus - VIPER06XS	-	AC-DC Converter	ST	STEVAL-ISA115V1 Active 12 V, 150 mA non-isolated buck converter using VIPer™ Plus - VIPER06XS
STEVAL-ISA116V1 Active	5 W, 2-output wide-range buck converter based on the VIPER26LD	-	AC-DC Converter	ST	STEVAL-ISA116V1 Active 5 W, 2-output wide-range buck converter based on the VIPER26LD
STEVAL-ISA119V1 Active	1.5 W double output buck demonstration board based on the VIPER16LD	-	AC-DC Converter	-	STEVAL-ISA119V1 Active 1.5 W double output buck demonstration board based on the VIPER16LD
STEVAL-ISA130V1 Active	12 V 140 mA 30 kHz non-isolated buck topology regulator based on VIPer06XN	-	AC-DC Converter	-	STEVAL-ISA130V1 Active 12 V 140 mA 30 kHz non-isolated buck topology regulator based on VIPer06XN
STEVAL-ISA178V1 Active	5 V / 200 mA high voltage buck-converter based on VIPer01	-	AC-DC Converter	ST	STEVAL-ISA178V1 Active 5 V / 200 mA high voltage buck-converter based on VIPer01
STEVAL-ISA179V1 Active	15 V, 0.15 A buck converter using VIPer™ Plus - VIPer0P	-	AC-DC Converter	ST	STEVAL-ISA179V1 Active 15 V, 0.15 A buck converter using VIPer™ Plus - VIPer0P
STEVAL-ISA195V1 Active	5 V / 0.36 A buck converter using VIPerPlus ? VIPer11	VIPER11	AC-DC Converter	ST	STEVAL-ISA195V1 Active 5 V / 0.36 A buck converter using VIPerPlus ? VIPer11
STEVAL-PMIC1K1 Active	Evaluation board for high integration STPMIC1x power management IC for microprocessor units	STPMIC1	PSU and Converter Solution Eval Boards	ST	STEVAL-PMIC1K1 Active Evaluation board for high integration STPMIC1x power management IC for microprocessor units
STEVAL-VP12201B Active	15 V/200 mA buck converter based on VIPER122	VIPER122	AC-DC Converter	ST	STEVAL-VP12201B Active 15 V/200 mA buck converter based on VIPER122
STEVAL-VP22201B Active	5 V - 360 mA buck converter based on VIPer222XSTR	-	PSU and Converter Solution Eval Boards	ST	STEVAL-VP22201B Active 5 V - 360 mA buck converter based on VIPer222XSTR
STEVAL-VP26K01B Active	15 V / 100 mA high voltage buck converter reference design based on VIPER26K	VIPER26K	AC-DC Converter	ST	STEVAL-VP26K01B Active 15 V / 100 mA high voltage buck converter reference design based on VIPER26K
STEVAL-VP319X1B Active	5 V / 0.6 A Buck converter based on VIPER319X	-	AC-DC Converter	ST	STEVAL-VP319X1B Active 5 V / 0.6 A Buck converter based on VIPER319X

Buck and Buck-Boost Converter

Our products and solutions

Featured Videos

All resources

Application Notes (5 of 8)

Technical Notes & Articles (1)

User Manual (1)

Design Notes & Tips (1)

Flyers (1)

Brochures (1)

All tools & software

Finder Apps

ST Diode Finder

ST Voltage Regulator Finder

All Hardware Evaluation Tools

Evaluation Tools

STEVAL-ISA010V1

STEVAL-ISA096V1

STEVAL-ISA114V1

STEVAL-ISA115V1

STEVAL-ISA116V1

STEVAL-ISA119V1

STEVAL-ISA130V1

STEVAL-ISA178V1

STEVAL-ISA179V1

STEVAL-ISA195V1

STEVAL-PMIC1K1

STEVAL-VP12201B

STEVAL-VP22201B

STEVAL-VP26K01B

STEVAL-VP319X1B

Buck and Buck-Boost Converter

Our products and solutions

Featured Videos

All resources

Application Notes (5 of 8)

Technical Notes & Articles (1)

User Manual (1)

Design Notes & Tips (1)

Flyers (1)

Brochures (1)

All tools & software

Finder Apps

ST Diode Finder

ST Voltage Regulator Finder

All Hardware Evaluation Tools

Evaluation Tools

STEVAL-ISA010V1

STEVAL-ISA096V1

STEVAL-ISA114V1

STEVAL-ISA115V1

STEVAL-ISA116V1

STEVAL-ISA119V1

STEVAL-ISA130V1

STEVAL-ISA178V1

STEVAL-ISA179V1

STEVAL-ISA195V1

STEVAL-PMIC1K1

STEVAL-VP12201B

STEVAL-VP22201B

STEVAL-VP26K01B

STEVAL-VP319X1B

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