降圧レギュレータ(DC-DC降圧スイッチング・レギュレータ)は、入力電圧を降圧し、安定した出力電圧を提供するDC-DCコンバータです。
STのモノリシック降圧レギュレータICは、高いスイッチング周波数で61Vの最大入力電圧と、4Aの最大出力電流を供給します。STの幅広いポートフォリオは、様々な市場のニーズを満たす高度に特化された製品で構成されています。
- 産業および車載アプリケーション向けの高耐圧技術、高い信頼性、堅牢性、および省スペース
- コンスーマおよびコンピュータ製品向けに、高い性能レベルとあらゆる負荷における高効率を実現
STの降圧レギュレータは、包括的な保護機能(過電流、過電圧、過熱からの保護)を内蔵することでMTBF(平均故障間隔)を延ばすとともに、外付け部品数を削減しています。
いずれもコンパクトで熱性能の高いパッケージ・オプションが多数用意されています。
様々な降圧レギュレータ(降圧スイッチング・レギュレータ)
幅広いアプリケーションに対応する、STの降圧レギュレータのラインアップをご紹介します。
低静止電流降圧レギュレータIC
STの低IQ降圧レギュレータは、バッテリ駆動式の機器や、低消費電力で長時間のスタンバイ動作を必要とする機器のような、電力要件の厳しいアプリケーションに適しています。産業用および車載用アプリケーションのバッテリ駆動時間を伸ばし、全体として消費電力の削減に貢献します。
産業アプリケーション向け降圧レギュレータ

信頼性が高く堅牢性に優れた降圧レギュレータです。産業用アプリケーションや、幅広い入出力電圧が求められるアプリケーションに適しています。
産業用降圧レギュレータの製品ラインアップ車載アプリケーション向け降圧レギュレータ

STは高性能かつ柔軟性の高いAEC-Q100準拠の降圧レギュレータを、車載アプリケーション向けに提供しています。
車載用降圧レギュレータの製品ラインアップ注目ビデオ
New 400 mA synchronous buck converters, with nano-quiescent current and very high efficiency, push performance beyond limits
Boasting a quiescent current of only 500 nA, ST’s miniaturized ST1PS01 and ST1PS02 step-down converters with digital voltage selection specifically address battery-powered and energy-harvesting applications, thanks also to their high efficiency over a wide range of operating conditions.
The integrated power switch and compensation network allow this new generation of step-down converters to work with only just a few external components.
Evaluation boards are available for both products, to support developers in their designs.
New 61 V, 3 A step-down switching regulator for automotive application
Housed in a HTSSOP16-package, the A7987 is a 3 A step-down switching regulator with a wide input-voltage range, making it suitable for 24 V battery-powered applications.
Specifically recommended to design flexible and robust solutions, the A7987 also offers a set of additional functionalities including adjustable current limit, synchronization with a 180° phase shift, and power sequencing.
These key features ensure flexible and stable performance when several voltage rails are powered up in automotive applications such as body infotainment and telematics.
Large selection of step-down DC-DC regulators with synchronous rectification
In the quest for higher efficiency and compact form factor in their DC-DC supply designs, engineers now have a few more allies: the L6985F, L6986F and L6986 step-down DC-DC regulators with synchronous rectification and an output current of 0.5 A, 1,5 A and 2 A respectively.
Based on a peak current mode architecture with a p-channel power MOSFET, they feature a selectable low-consumption-mode (LCM burst mode) to increase efficiency at light load, and a low-noise-mode (LNM with fixed PWM switching frequency) for noise-sensitive designs.
An easy-to-use evaluation board (STEVAL-ISA156V1) based on the L6986 regulator is available to help you configure and evaluate application parameters so you can reach higher efficiency, higher power density and lower standby power designs.
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L5983
Up to 1.5 A step down switching regulator
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L5985
Up to 2 A step down switching regulator
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A7987
61 V 3A asynchronous step-down switching regulator with adjustable current limitation for automotive
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ST1PS01
400mA Nano-Quiescent Synchronous step-down converter with digital voltage selection and power good
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L5980
Up to 0.7 A step down switching regulator
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L5981
Up to 1 A step down switching regulator
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A5972D
Up to 1.5 A step-down switching regulator for automotive applications
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A5973AD
Up to 1.5 A step-down switching regulator for automotive applications
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A5970AD
Up to 1 A step down switching regulator for automotive applications
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A5970D
Up to 1 A step-down switching regulator for automotive applications
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A5973D
Up to 2 A step down switching regulator for automotive applications
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A6902D
Up to 1 A step down switching regulator with adjustable current limit forautomotive applications
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AST1S31HF
Up to 4 V, 3 A step-down 2.3 MHz switching regulator for automotive applications
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ST1S14
Up to 3 A step down switching regulator
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ST1S30
3 A, 1.5 MHz PWM step-down switching regulator with synchronous rectification
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L4964
High current switching regulator
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A5974D
Up to 2.5 A step down switching regulator for automotive applications
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L296
HIGH CURRENT SWITCHING REGULATORS
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B5973D
2 A step down switching regulator for automotive applications
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L7987
61 V 3 A asynchronous step-down switching regulator with adjustable current limitation
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STPD01
Programmable Buck Converter for USB Power Delivery
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A6986F
38 V 1.5 A synchronous step-down switching regulator with 30 uA quiescent current
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L6986F
38 V 1.5 A synchronous step-down switching regulator with 30 uA quiescent current
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ST1S15
500 mA, 6 MHz synchronous step-down converter
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A6984
36 V 400 mA synchronous step-down switching regulator
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ST1S06
Synchronous rectification with inhibit, 1.5 A, 1.5 MHz adjustable, step-down switching regulator
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L4972
2 A SWITCHING REGULATOR
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ST1S40
3A DC step-down switching regulator
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L6926
High Efficiency Synchronous Step-Down Regulator
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ST2S08B
Dual synchronous rectification, 1.5 A, 1.5 MHz adjustable step-down switching regulator
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L5970AD
Up to 1 A step down switching regulator
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A6985F
Automotive 38 V, 500 mA synchronous step-down switching regulator with 30 uA quiescent current
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L6985F
38 V 500 mA synchronous step-down switching regulator with 30 uA quiescent current
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PM8908
Monolithic buck converter for DDR memory termination
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ST1S32
4 A DC step-down switching regulator
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L6902
1 A switching regulator with adjustable current limit
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ST1S41
4 A step-down switching regulator
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ST2S06
Dual synchronous rectification with reset or inhibit, 0.5 A, 1.5 MHz adjustable step-down switching regulator
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ST1S09
Synchronous rectification with inhibit, 2 A, 1.5 MHz adjustable, step-down switching regulator
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L7983
60 V 300 mA synchronous step-down switching regulator with 10 µA quiescent current
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L6983
38 V 3A synchronous step-down converter with 17uA quiescent current
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L5973D
Up to 2 A step down switching regulator
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L5972D
Up to 1.5 A step down switching regulator
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L7981
3 A step-down switching regulator
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L7980
2 A step-down switching regulator
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ST1S31
3 A DC step-down switching regulator
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L6984
36 V 400 mA synchronous step-down switching regulator
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L6986
38 V 2 A synchronous step-down switching regulator with 30 uA quiescent current
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PM8903A
3 A step-down monolithic switching regulator
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L5988D
4 A continuous (more than 5 A pulsed) step-down switching regulator with synchronous rectification
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L6986H
38 V, 2 A synchronous step-down switching regulator with 30 µA quiescent current
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L5970D
Up to 1 A step down switching regulator
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AST1S31
Up to 4 V, 3 A step-down 1.5 MHz switching regulator for automotive applications
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L4978
2A Step down switching regulator
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ST1S50
4A Monolithic synchronous step-down converter with high efficiency at light load
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L5973AD
Up to 1.5 A step down switching regulator
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ST1PS02
400mA Nano-Quiescent Synchronous step-down converter with digital voltage selection, Power Good and AUX switch
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L4976
1 A step down switching regulator
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A6986H
38 V, 2 A synchronous step-down switching regulator with 30 uA quiescent current
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A5974AD
Up to 2 A step-down switching regulator for automotive applications
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A5975D
Up to 3 A step down switching regulator for automotive applications
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A5975AD
Up to 2.5 A step-down switching regulator for automotive applications
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ST1S03
1.5 A, 1.5 MHz adjustable, step-down switching regulator
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L4973
3.5 A step down switching regulator
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ST1S10
Monolithic synchronous step-down regulator
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L4974A
3.5 A switching regulator
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L4971
1.5A Switching Regulator
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L4970A
10 A switching regulator
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L4963
1.5 A SWITCHING REGULATOR
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ST1S12XX
Synchronous rectification with inhibit, 0.7 A, 1.7 MHz adjustable, step-down switching regulator
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A7986A
3 A step-down switching regulator for automotive applications
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A7985A
2 A step-down switching regulator for automotive applications
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L4975A
5 A switching regulator
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L6981
38 V, 1.5 A synchronous step-down converter with low quiescent current
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L5986
2.5 A step-down switching regulator
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L5987
3 A step-down switching regulator
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A6986
38 V, 2 A synchronous step-down switching regulator with 30 uA quiescent current
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L4962
1.5 A Switching Regulator
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L7987L
61 V 2 A asynchronous step-down switching regulator with adjustable current limitation
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L7985
2A step-down switching regulator
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L7986TA
3A step-down switching regulator
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L7986
3A step-down switching regulator
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L6928
High efficiency monolithic synchronous step down regulator