A buck converter also called buck regulator or DC-DC step-down switching regulator, is a type of DC-DC converter which provides an output regulated voltage that is lower than its input voltage.
ST's monolithic step-down (buck) converter ICs offer input-voltage capability up to 61 V, deliver output currents up to 4 A, with high switching frequency. This broad portfolio of ICs is composed of highly-specialized products to meet every market requirement:
- High-voltage technology together with high reliability, robustness and compactness for industrial and automotive applications
- High efficiency at any load and a high level of performance for consumer and computer products
These buck regulators embed a full set of protection functions (overcurrent, overvoltage, over-temperature) to increase the MTBF and reduce the number of external components.
There are multiple package options, all offering compactness and high thermal performances.
Featured buck converters
Wide range of step-down (buck) switching regulators
Learn about ST broad selection of buck converters, designed to meet a wide range of application requirements.
Low quiescent current buck converter ICs
ST's low IQ buck converters are ideal for any power-budgeted applications, such as battery-powered devices or green-compliant equipment with long stand-by operation. Extend the battery life and reduce the overall power consumption of your industrial and automotive application designs.
Isolated buck converters
Reduce Bill-Of-Materials costs in Automotive and Industrial applications.
Buck converters for Industrial applications

High reliability and excellent robustness buck converters, for industrial and any application requiring a wide range of input output voltages.
See all Industrial buck convertersBuck converters for Automotive applications

ST offers high performance and high flexibility AEC-Q100 compliant buck converters for automotive applications.
See all Automotive buck converters精选 视频
特别推荐
New Isolated Buck Converters Reduce Bill-of-Materials Costs in Automotive and Industrial Applications
面向隔离式降压调节器设计而优化的A6986I和L6986I DC/DC转换器拥有宽泛的输入电压范围和低静态电流,确保能在最高5W的汽车和工业应用中稳健运行且有效节能。
对于需要一个稳定非隔离型初级电压和一个或多个隔离型次级电压的系统,隔离式降压拓扑极大地减少了物料清单。
除此之外,还有评估板帮助设计人员构建和验证自己的设计。
STEVAL-A6986IV1, STEVAL-A6986IV2, STEVAL-L6986IV1
新型400 mA同步降压转换器,具有毫微静态电流和极高的效率,推动性能超越极限
意法半导体的微型ST1PS01、ST1PS02和ST1PS03降压转换器的静态电流仅为500 nA,针对电池供电和能量收集应用特别提供数字电压选择功能,能够在各种工作条件下实现高效率。
由于采用集成式电源开关和补偿网络,新一代降压转换器仅需几个外部组件即可工作。
三种产品都可使用评估板,以支持开发人员的设计工作。
STEVAL-1PS01AJR;STEVAL-1PS01DJR;STEVAL-1PS01EJR;STEVAL-1PS02B;STEVAL-1PS03A
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.
- L5983 1.5 A step-down switching regulator
- L5985 2 A step-down switching regulator
- A7987 61 V 3A asynchronous step-down switching regulator with adjustable current limitation for automotive
- ST1PS03 400 mA nano-quiescent synchronous step-down converter with digital voltage selection, Power Good and independent Load Switch
- ST1PS01 400 mA nano-quiescent synchronous step-down converter with digital voltage selection and Power Good
- L5980 0.7 A step-down switching regulator
- ST1S09 2 A, 1.5 MHz PWM step-down switching regulator with synchronous rectification
- L5981 1 A step-down switching regulator
- A5972D Up to 1.5 A step-down switching regulator for automotive applications
- A5973AD Up to 1.5 A step-down switching regulator for automotive applications
- L7983 60 V 300 mA synchronous step-down switching regulator with 10 µA quiescent current
- A5970AD Up to 1 A step down switching regulator for automotive applications
- A5970D Up to 1 A step-down switching regulator for automotive applications
- L6983 38 V, 3 A synchronous step-down converter with 17 µA quiescent current
- A5973D Up to 2 A step down switching regulator for automotive applications
- A6902D Up to 1 A step down switching regulator with adjustable current limit for automotive applications
- L5973D Up to 2 A step down switching regulator
- AST1S31HF Up to 4 V, 3 A step-down 2.3 MHz switching regulator for automotive applications
- ST1S14 Up to 3 A step-down switching regulator
- L5972D 2A switch step down switching regulator
- L7981 3 A step-down switching regulator
- ST1S30 3 A, 1.5 MHz PWM step-down switching regulator with synchronous rectification
- L7980 2 A step-down switching regulator
- ST1S31 3 A DC step-down switching regulator
- L6984 36 V, 400 mA synchronous step-down switching regulator
- L6986 38 V, 2 A synchronous step-down switching regulator with 30 µA quiescent current
- PM8903A 3 A step-down monolithic switching regulator
- L4964 High current switching regulator
- L6986I 38 V, 5W synchronous iso-buck converter
- A6986I Automotive 38 V, 5W synchronous iso-buck converter
- L5988D 4 A continuous (more than 5 A pulsed) step-down switching regulator with synchronous rectification
- A5974D Up to 2.5 A step down switching regulator for automotive applications
- L6986H 38 V, 2 A synchronous step-down switching regulator with 30 µA quiescent current
- L296 HIGH CURRENT SWITCHING REGULATORS
- L5970D Up to 1 A step down switching regulator
- AST1S31 Up to 4 V, 3 A step-down 1.5 MHz switching regulator for automotive applications
- L4978 2A Step down switching regulator
- L7987 61 V 3 A asynchronous step-down switching regulator with adjustable current limitation
- ST1S50 4 A Monolithic synchronous step-down converter with high efficiency at light load
- STPD01 Programmable Buck Converter for USB Power Delivery
- L5973AD 2 A switch step down switching regulator
- A6986F Automotive 38 V, 1.5 A synchronous step-down switching regulator with 30 µA quiescent current
- L6986F 38 V, 1.5 A synchronous step-down switching regulator with 30 µA quiescent current
- ST1S15 500 mA, 6 MHz synchronous step-down converter
- ST1PS02 400 mA nano-quiescent synchronous step-down converter with digital voltage selection, Power Good and AUX switch
- L4976 1 A step down switching regulator
- A5974AD Up to 2 A step-down switching regulator for automotive applications
- A5975D Up to 3 A step down switching regulator for automotive applications
- A6984 36 V 400 mA synchronous step-down switching regulator
- A5975AD Up to 2.5 A step down switching regulator for automotive applications
- ST1S03 1.5 A, 1.5 MHz adjustable, step-down switching regulator
- L4973 3.5 A step down switching regulator
- ST1S10 3 A, 900 kHz, monolithic synchronous step-down regulator IC
- L4974A 3.5 A switching regulator
- L4971 1.5A Switching Regulator
- ST1S06 Synchronous rectification with inhibit, 1.5 A, 1.5 MHz fixed or adjustable, step-down switching regulator
- L4970A 10 A switching regulator
- L4963 1.5 A SWITCHING REGULATOR
- ST1S12XX Synchronous rectification with enable, 0.7 A, 1.7 MHz fixed or adjustable step-down switching regulator in TSOT23-5L
- A7986A 3 A step-down switching regulator for automotive applications
- A7985A 2 A step-down switching regulator for automotive applications
- L4972 2 A SWITCHING REGULATOR
- ST1S40 3 A DC step-down switching regulator
- L6926 High efficiency monolithic synchronous step-down regulator
- ST2S08B Dual synchronous rectification, 1.5 A, 1.5 MHz adjustable step-down switching regulator
- L4975A 5 A switching regulator
- L6981 38 V, 1.5 A synchronous step-down converter with low quiescent current
- L5986 2.5 A step-down switching regulator
- L5987 3 A step-down switching regulator
- L5970AD Up to 1 A step down switching regulator
- A6986 38 V, 2 A synchronous step-down switching regulator with 30 µA quiescent current
- A6985F Automotive 38 V, 500 mA synchronous step-down switching regulator with 30 µA quiescent current
- L6985F 38 V, 500 mA synchronous step-down switching regulator with 30 µA quiescent current
- L7987L 61 V 2 A asynchronous step-down switching regulator with adjustable current limitation
- PM8908 Monolithic buck converter for DDR memory termination
- ST1S32 4 A DC step-down switching regulator
- L6902 Up to 1 A switching regulator with adjustable current limit
- ST1S41 4 A step-down switching regulator
- ST2S06 Dual synchronous rectification with reset or inhibit, 0.5 A, 1.5 MHz adjustable step-down switching regulator
- L7985 2 A step-down switching regulator
- L7986TA 3 A step-down switching regulator
- L6982 38 V, 2 A synchronous step-down converter with low quiescent current
- L3751 Wide 6 V to 75 V input voltage synchronous buck controller
- L7986 3 A step-down switching regulator
- L6928 High efficiency monolithic synchronous step-down regulator
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