Buck-Boost, Buck Converters - STMicroelectronics

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. Read more

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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.

Latest from ST

	Resource title		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		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		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		Latest update
PDF	VIPerPlus - Bring a Plus to your SMPS design 05.2020		26 Mar 2021	26 Mar 2021 VIPerPlus - Bring a Plus to your SMPS design 05.2020

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Buck and Buck-Boost Converter

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	Resource title	Latest update
PDF	AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family 4.2	24 Mar 2021	24 Mar 2021 AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family 4.2
PDF	AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1	24 Mar 2020	24 Mar 2020 AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1
PDF	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
PDF	AN604 Calculation of conduction losses in a power rectifier 3.2	24 Mar 2021	24 Mar 2021 AN604 Calculation of conduction losses in a power rectifier 3.2
PDF	AN4021 Calculation of reverse losses in a power diode 1.0	24 Mar 2021	24 Mar 2021 AN4021 Calculation of reverse losses in a power diode 1.0
PDF	AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1	24 Mar 2021	24 Mar 2021 AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1
PDF	AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0	24 Mar 2021	24 Mar 2021 AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
PDF	AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0	24 Mar 2021	24 Mar 2021 AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0
PDF	AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1	24 Mar 2021	24 Mar 2021 AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
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	24 Mar 2021	24 Mar 2021 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
PDF	AN869 Tj max limit of Schottky diodes 2.2	24 Mar 2021	24 Mar 2021 AN869 Tj max limit of Schottky diodes 2.2