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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.

We have a large offer of buck regulators - with integrated power switches – and 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.

产品型号
描述
STEVAL-ISA043V2 1.5 A / 3.3 V high frequency synchronous buck converter demonstration board based on the ST1S06 Quick view

主要特性

  • Adjustable current-mode pulse width modulation (PWM) synchronous, step-down DC-DC converter with inhibit function
  • Input voltage, Vin: 2.5 V to 5.5 V
  • Output voltage, Vout: 3.3 V
  • Output current, Iout: 1.5 A
  • Switching frequency: 1.5 MHz
  • RoHS compliant

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STEVAL-ISA095V1 Up to 3 A step-down switching regulator based on the ST1S14 Quick view

主要特性

  • 3 A DC output current
  • Operating input voltage from 5.5 V to 48 V
  • 850 kHz internally fixed switching frequency
  • Internal soft-start
  • Internal current limiting
  • Inhibit for zero current consumption
  • 2 mA maximum quiescent current over-temperature range
  • Thermal shutdown
  • RoHS compliant

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STEVAL-ISA082V1 4 A peak 800 kHz fixed-frequency PWM synchronous step-down demonstration board with enable on/off based on the ST1S40IPHR Quick view

主要特性

  • Input voltage Vin = 4 V to 18 V
  • Output voltage Vout = 3.3 V
  • Maximum output current: 3 A
  • Switching frequency: 800 kHz
  • Short-circuit protected
  • RoHS compliant

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STEVAL-ISA069V1 3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in DFN 3x3 package Quick view

主要特性

  • 4 A peak output current
  • From 2.8 V to 5.5 V input voltage
  • Output voltage adjustable from 0.8 V
  • 1.5 MHz switching frequency
  • Internal soft-start and enable
  • Integrated 60 mΩ and 45 mΩ power MOSFETs
  • All ceramic capacitors
  • Power Good (POR)
  • Cycle-by-cycle current limiting
  • Current foldback short-circuit protection
  • RoHS compliant

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STEVAL-ISA099V1 3 A step-down switching demonstration board based on the L7986 in DFN10 package Quick view

主要特性

  • 3 A DC output current
  • From 4.5 V to 38 V range input voltage
  • Output voltage adjustable from 0.6 V
  • 250 kHz switching frequency programmable up to 1 MHz
  • Internal soft-start and enable
  • Low dropout operation: 100% duty cycle
  • Voltage feed-forward
  • Zero load current operation
  • Overcurrent and thermal protection
  • RoHS compliant

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STEVAL-ISA152V1 3.3 V/3 A high efficiency step down DC-DC converter (VIN= 4.5 to 60 V) based on the L7987 Quick view

主要特性

  • 3.3 V output voltage
  • 3 A DC output current
  • 4.5 V to 60 V input voltage
  • 500 kHz switching frequency
  • 3.5 ms programmed soft-start
  • VBIAS switch-over for improved efficiency at light load
  • 180° out of phase synchronization available
  • Open drain PGOOD available
  • Auto recovery overcurrent and thermal protection
  • RoHS compliant

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STEVAL-ISA158V1 38 V - 2 A synchronous step-down switching regulator evaluation board based on the A6986 Quick view

主要特性

  • 4 V to 38 V operating input voltage
  • Low consumption mode or low noise mode
  • 30 µA IQ at light load (LCM VOUT = 3.3 V)
  • 5 µA IQ-SHTDWN
  • Adjustable fSW (250 kHz - 2 MHz)
  • Output voltage adjustable from 0.85 V to VIN
  • Embedded output voltage supervisor
  • Synchronization
  • Adjustable soft-start time
  • Internal current limiting
  • Overvoltage protection
  • Output voltage sequencing
  • Peak current mode architecture
  • RDS(on)HS = 180 mΩ; RDS(on)LS = 150 mΩ
  • Thermal shutdown
  • RoHS compliant

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STEVAL-1PS01DJR Evaluation board based on ST1PS01DJR 400 mA nano-quiescent synchronous step-down converter Quick view

主要特性

  • 1.8 V to 5.5 V input operating range
  • Up to 400 mA output current capability
  • Tiny external components: L=2.2 µH typ
  • Selectable output voltages: 1.8 V to 2.8 V
  • Output voltage Power Good
  • Dynamic output voltage selection (D0, D1)
  • Suitable for the following applications:
    • Wearable applications
    • Personal tracking monitors
    • Smart watches, sport bands
    • Energy harvesting, wireless sensors
    • Wearable and fitness accessories
    • Industrial sensors, portable low power devices
    • Single cell Li-Ion battery applications
    • Bluetooth® low energy
    • ZigBee®
  • WEEE and RoHS compliant (hardware only)

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STEVAL-1PS01EJR Evaluation board based on the ST1PS01EJR 400 mA nano-quiescent synchronous step-down converter Quick view

主要特性

  • 94% typical efficiency at 1 mA load (VIN =3.6 V, VOUT =3.3 V)
  • 1.8 V to 5.5 V input operating range
  • Up to 400 mA output current capability
  • Tiny external components: L=2.2 µH typ.
  • Selectable output voltages: 1.8 V to 3.3 V
  • Output voltage Power Good
  • Dynamic output voltage selection (D0, D1)
  • Suitable for the following applications:
    • Wearable applications
    • Personal tracking monitors
    • Smart watches, sport bands
    • Energy harvesting, wireless sensors
    • Wearable and fitness accessories
    • Industrial sensors, portable low power devices
    • Single cell Li-Ion battery applications
    • Bluetooth® low energy
    • ZigBee®
  • Hardware is WEEE and RoHS compliant

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STEVAL-1PS01AJR Evaluation board based on ST1PS01AJR 400 mA nano-quiescent synchronous step-down converter Quick view

主要特性

  • 1.8 V to 5.5 V input operating range
  • Up to 400 mA output current capability
  • Tiny external components: L=2.2 µH typ.
  • Selectable output voltages: 1.9 V to 2.8 V
  • Output voltage Power Good
  • Dynamic output voltage selection (D0, D1)
  • Suitable for the following applications:
    • Wearable applications
    • Personal tracking monitors
    • Smart watches, sport bands
    • Energy harvesting, wireless sensors
    • Wearable and fitness accessories
    • Industrial sensors, portable low power devices
    • Single cell Li-Ion battery applications
    • Bluetooth® low energy
    • Zigbee
  • WEEE and RoHS compliant (hardware only)

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AEK-POW-L5964V1 Digitally controlled DC-DC converter with L5964 for automotive applications Quick view

主要特性

  • Dual channel, independent, step-down regulators with integrated synchronous MOSFETs
  • Output current up to 3 A each channel
  • Channels can be paralleled to obtain a higher current supply
  • Input voltage range from 6 to 14 V
  • Digitally selectable fixed output voltages: 3.3 - 5 - 9 V
  • PWM programmable output voltages with 20 mV steps over a range of 3.3 - 11 V
  • Outputs protected against short-circuit and overcurrent
  • Input and output voltage monitors (UV or OV) and power good signals
  • Thermal protection thanks to the integrated thermal sensor
  • Additional 3.3 V output by internal linear regulator
  • Watchdog, reset, in/out synchronisation for available converters
  • Board size: 84.7 mm x 81.3 mm
  • Maximum component height: 10 mm
  • Automotive grade qualified ST components
  • Included in the AutoDevKit™ initiative
  • CE certified
  • RoHS and China RoHS compliant
  • WEEE compliant

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STEVAL-ISA205V1 38 V, 2 A synchronous step-down switching regulator evaluation board based on the A6986H Quick view

主要特性

  • AECQ100 qualification
  • 2 A DC output current
  • 4 V to 38 V operating input voltage
  • Low consumption mode or low noise mode
  • Programmable ISKIP current
  • 30 μA IQ at light load (LCM VIN  = 12 V and VOUT  = 3.3 V)
  • 8 μA IQ-SHTDWN
  • Adjustable fSW (250 kHz - 2 MHz)
  • Output voltage adjustable from 0.85 V to VIN
  • Embedded output voltage supervisor
  • Synchronization (in all fSW range)
  • Adjustable soft-start time
  • Internal current limiting
  • Overvoltage protection
  • Peak current mode architecture
  • RDS(on)HS  = 180 mΩ; RDS(on)LS  = 150 mΩ
  • Thermal shutdown
  • RoHS and WEEE compliant

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STEVAL-ISA207V1 3 A step down DC/DC switching regulator (VIN = 4.5 V to 60 V) based on the A7987 Quick view

主要特性

  • 4.5 V to 60 V input voltage
  • Step-down (buck) conversion
  • 3.3 V output voltage
  • Up to 3 A DC output current
  • 500 kHz switching frequency
  • 3.5 ms programmed soft-start
  • Compliant with ceramic output capacitors
  • 180° out-of-phase synchronization available
  • Auto recovery overcurrent and thermal protection
  • RoHS and China RoHS compliant
  • WEEE compliant (2012/19/UE RAEE II)

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STEVAL-ISA208V1 38 V, 3 A synchronous step-down switching regulator evaluation board based on the L6983CQTR Quick view

主要特性

  • 3.5 V to 38 V operating input voltage
  • Output voltage from 0.85 V to VIN
  • 3.3 V and 5 V fixed output voltage versions
  • 3 A DC output current
  • 17 μA operating quiescent current
  • Internal compensation network
  • Two different versions:
    • LCM for high efficiency at light loads
    • LNM for noise sensitive applications
  • 2 μA shutdown current
  • Internal soft-start
  • Enable
  • Overvoltage protection
  • Thermal protection
  • Output voltage sequencing
  • QFN16 package
  • 200 kHz to 2.2 MHz programmable switching frequency; stable with low ESR capacitor
  • Optional spread spectrum for improved EMC
  • Power good
  • Synchronization to external clock for LNM devices

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STEVAL-ISA094V1 3 A step-down switching power supply demonstration board based on the L7981 (HSOP8) Quick view

主要特性

  • 3 A DC output current
  • 4.5 V to 28 V input voltage
  • Output voltage adjustable from 0.6 V
  • 250 kHz switching frequency, programmable up to 1 MHz
  • Internal soft-start and enable
  • Low dropout operation: 100% duty cycle
  • Voltage feed-forward
  • Zero load current operation
  • Overcurrent and thermal protection
  • RoHS compliant

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STEVAL-ISA055V1 0.7 A / 1.2 V synchronous buck converter with enable function based on the ST1S12XX Quick view

主要特性

  • RDS(on) typ. 250 m and 400 m
  • Not switching quiescent current: max 600 μA over temperature range
  • Uses tiny capacitors and inductors
  • Internal soft-start
  • Enable function
  • Step-down current mode PWM (1.7 MHz) DCDC converter
  • 0.7 A output current capability
  • Fixed output voltage of 1.2 V
  • Synchronous rectification
  • Typical efficiency: > 90%
  • 3% DC output voltage tolerance

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产品型号
STEVAL-ISA043V2

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

主要特性

  • Adjustable current-mode pulse width modulation (PWM) synchronous, step-down DC-DC converter with inhibit function
  • Input voltage, Vin: 2.5 V to 5.5 V
  • Output voltage, Vout: 3.3 V
  • Output current, Iout: 1.5 A
  • Switching frequency: 1.5 MHz
  • RoHS compliant

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STEVAL-ISA095V1

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

主要特性

  • 3 A DC output current
  • Operating input voltage from 5.5 V to 48 V
  • 850 kHz internally fixed switching frequency
  • Internal soft-start
  • Internal current limiting
  • Inhibit for zero current consumption
  • 2 mA maximum quiescent current over-temperature range
  • Thermal shutdown
  • RoHS compliant

Show More

STEVAL-ISA082V1

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

主要特性

  • Input voltage Vin = 4 V to 18 V
  • Output voltage Vout = 3.3 V
  • Maximum output current: 3 A
  • Switching frequency: 800 kHz
  • Short-circuit protected
  • RoHS compliant

Show More

STEVAL-ISA069V1

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

主要特性

  • 4 A peak output current
  • From 2.8 V to 5.5 V input voltage
  • Output voltage adjustable from 0.8 V
  • 1.5 MHz switching frequency
  • Internal soft-start and enable
  • Integrated 60 mΩ and 45 mΩ power MOSFETs
  • All ceramic capacitors
  • Power Good (POR)
  • Cycle-by-cycle current limiting
  • Current foldback short-circuit protection
  • RoHS compliant

Show More

STEVAL-ISA099V1

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

主要特性

  • 3 A DC output current
  • From 4.5 V to 38 V range input voltage
  • Output voltage adjustable from 0.6 V
  • 250 kHz switching frequency programmable up to 1 MHz
  • Internal soft-start and enable
  • Low dropout operation: 100% duty cycle
  • Voltage feed-forward
  • Zero load current operation
  • Overcurrent and thermal protection
  • RoHS compliant

Show More

STEVAL-ISA152V1

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

主要特性

  • 3.3 V output voltage
  • 3 A DC output current
  • 4.5 V to 60 V input voltage
  • 500 kHz switching frequency
  • 3.5 ms programmed soft-start
  • VBIAS switch-over for improved efficiency at light load
  • 180° out of phase synchronization available
  • Open drain PGOOD available
  • Auto recovery overcurrent and thermal protection
  • RoHS compliant

Show More

STEVAL-ISA158V1

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

主要特性

  • 4 V to 38 V operating input voltage
  • Low consumption mode or low noise mode
  • 30 µA IQ at light load (LCM VOUT = 3.3 V)
  • 5 µA IQ-SHTDWN
  • Adjustable fSW (250 kHz - 2 MHz)
  • Output voltage adjustable from 0.85 V to VIN
  • Embedded output voltage supervisor
  • Synchronization
  • Adjustable soft-start time
  • Internal current limiting
  • Overvoltage protection
  • Output voltage sequencing
  • Peak current mode architecture
  • RDS(on)HS = 180 mΩ; RDS(on)LS = 150 mΩ
  • Thermal shutdown
  • RoHS compliant

Show More

STEVAL-1PS01DJR

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

主要特性

  • 1.8 V to 5.5 V input operating range
  • Up to 400 mA output current capability
  • Tiny external components: L=2.2 µH typ
  • Selectable output voltages: 1.8 V to 2.8 V
  • Output voltage Power Good
  • Dynamic output voltage selection (D0, D1)
  • Suitable for the following applications:
    • Wearable applications
    • Personal tracking monitors
    • Smart watches, sport bands
    • Energy harvesting, wireless sensors
    • Wearable and fitness accessories
    • Industrial sensors, portable low power devices
    • Single cell Li-Ion battery applications
    • Bluetooth® low energy
    • ZigBee®
  • WEEE and RoHS compliant (hardware only)

Show More

STEVAL-1PS01EJR

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

主要特性

  • 94% typical efficiency at 1 mA load (VIN =3.6 V, VOUT =3.3 V)
  • 1.8 V to 5.5 V input operating range
  • Up to 400 mA output current capability
  • Tiny external components: L=2.2 µH typ.
  • Selectable output voltages: 1.8 V to 3.3 V
  • Output voltage Power Good
  • Dynamic output voltage selection (D0, D1)
  • Suitable for the following applications:
    • Wearable applications
    • Personal tracking monitors
    • Smart watches, sport bands
    • Energy harvesting, wireless sensors
    • Wearable and fitness accessories
    • Industrial sensors, portable low power devices
    • Single cell Li-Ion battery applications
    • Bluetooth® low energy
    • ZigBee®
  • Hardware is WEEE and RoHS compliant

Show More

STEVAL-1PS01AJR

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

主要特性

  • 1.8 V to 5.5 V input operating range
  • Up to 400 mA output current capability
  • Tiny external components: L=2.2 µH typ.
  • Selectable output voltages: 1.9 V to 2.8 V
  • Output voltage Power Good
  • Dynamic output voltage selection (D0, D1)
  • Suitable for the following applications:
    • Wearable applications
    • Personal tracking monitors
    • Smart watches, sport bands
    • Energy harvesting, wireless sensors
    • Wearable and fitness accessories
    • Industrial sensors, portable low power devices
    • Single cell Li-Ion battery applications
    • Bluetooth® low energy
    • Zigbee
  • WEEE and RoHS compliant (hardware only)

Show More

AEK-POW-L5964V1

Digitally controlled DC-DC converter with L5964 for automotive applications

主要特性

  • Dual channel, independent, step-down regulators with integrated synchronous MOSFETs
  • Output current up to 3 A each channel
  • Channels can be paralleled to obtain a higher current supply
  • Input voltage range from 6 to 14 V
  • Digitally selectable fixed output voltages: 3.3 - 5 - 9 V
  • PWM programmable output voltages with 20 mV steps over a range of 3.3 - 11 V
  • Outputs protected against short-circuit and overcurrent
  • Input and output voltage monitors (UV or OV) and power good signals
  • Thermal protection thanks to the integrated thermal sensor
  • Additional 3.3 V output by internal linear regulator
  • Watchdog, reset, in/out synchronisation for available converters
  • Board size: 84.7 mm x 81.3 mm
  • Maximum component height: 10 mm
  • Automotive grade qualified ST components
  • Included in the AutoDevKit™ initiative
  • CE certified
  • RoHS and China RoHS compliant
  • WEEE compliant

Show More

STEVAL-ISA205V1

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

主要特性

  • AECQ100 qualification
  • 2 A DC output current
  • 4 V to 38 V operating input voltage
  • Low consumption mode or low noise mode
  • Programmable ISKIP current
  • 30 μA IQ at light load (LCM VIN  = 12 V and VOUT  = 3.3 V)
  • 8 μA IQ-SHTDWN
  • Adjustable fSW (250 kHz - 2 MHz)
  • Output voltage adjustable from 0.85 V to VIN
  • Embedded output voltage supervisor
  • Synchronization (in all fSW range)
  • Adjustable soft-start time
  • Internal current limiting
  • Overvoltage protection
  • Peak current mode architecture
  • RDS(on)HS  = 180 mΩ; RDS(on)LS  = 150 mΩ
  • Thermal shutdown
  • RoHS and WEEE compliant

Show More

STEVAL-ISA207V1

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

主要特性

  • 4.5 V to 60 V input voltage
  • Step-down (buck) conversion
  • 3.3 V output voltage
  • Up to 3 A DC output current
  • 500 kHz switching frequency
  • 3.5 ms programmed soft-start
  • Compliant with ceramic output capacitors
  • 180° out-of-phase synchronization available
  • Auto recovery overcurrent and thermal protection
  • RoHS and China RoHS compliant
  • WEEE compliant (2012/19/UE RAEE II)

Show More

STEVAL-ISA208V1

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

主要特性

  • 3.5 V to 38 V operating input voltage
  • Output voltage from 0.85 V to VIN
  • 3.3 V and 5 V fixed output voltage versions
  • 3 A DC output current
  • 17 μA operating quiescent current
  • Internal compensation network
  • Two different versions:
    • LCM for high efficiency at light loads
    • LNM for noise sensitive applications
  • 2 μA shutdown current
  • Internal soft-start
  • Enable
  • Overvoltage protection
  • Thermal protection
  • Output voltage sequencing
  • QFN16 package
  • 200 kHz to 2.2 MHz programmable switching frequency; stable with low ESR capacitor
  • Optional spread spectrum for improved EMC
  • Power good
  • Synchronization to external clock for LNM devices

Show More

STEVAL-ISA094V1

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

主要特性

  • 3 A DC output current
  • 4.5 V to 28 V input voltage
  • Output voltage adjustable from 0.6 V
  • 250 kHz switching frequency, programmable up to 1 MHz
  • Internal soft-start and enable
  • Low dropout operation: 100% duty cycle
  • Voltage feed-forward
  • Zero load current operation
  • Overcurrent and thermal protection
  • RoHS compliant

Show More

STEVAL-ISA055V1

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

主要特性

  • RDS(on) typ. 250 m and 400 m
  • Not switching quiescent current: max 600 μA over temperature range
  • Uses tiny capacitors and inductors
  • Internal soft-start
  • Enable function
  • Step-down current mode PWM (1.7 MHz) DCDC converter
  • 0.7 A output current capability
  • Fixed output voltage of 1.2 V
  • Synchronous rectification
  • Typical efficiency: > 90%
  • 3% DC output voltage tolerance

Show More

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      Linear and Switching Voltage Regulators Selection Guide

    • 描述 版本 文档大小 操作
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
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      Switching Converters (DC-DC) – Quick Reference Guide

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转换器

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.

电源管理

产品型号 描述
A7985A 2 A step-down switching regulator for automotive applications
A7986A 3 A step-down switching regulator for automotive applications
L6985F 38 V 500 mA synchronous step-down switching regulator with 30 uA quiescent current
L6986 38 V 2 A synchronous step-down switching regulator with 30 uA quiescent current
L6986F 38 V 1.5 A synchronous step-down switching regulator with 30 uA quiescent current
L7987 61 V 3 A asynchronous step-down switching regulator with adjustable current limitation
L7987L 61 V 2 A asynchronous step-down switching regulator with adjustable current limitation
ST1S06 Synchronous rectification with inhibit, 1.5 A, 1.5 MHz adjustable, step-down switching regulator
ST1S12XX Synchronous rectification with inhibit, 0.7 A, 1.7 MHz adjustable, step-down switching regulator
ST1S14 Up to 3 A step down switching regulator
ST1S31 3 A DC step-down switching regulator
ST1S40 3A DC step-down switching regulator
ST1S41 4 A step-down switching regulator
产品型号
2 A step-down switching regulator for automotive applications
3 A step-down switching regulator for automotive applications
38 V 500 mA synchronous step-down switching regulator with 30 uA quiescent current
38 V 2 A synchronous step-down switching regulator with 30 uA quiescent current
38 V 1.5 A synchronous step-down switching regulator with 30 uA quiescent current
61 V 3 A asynchronous step-down switching regulator with adjustable current limitation
61 V 2 A asynchronous step-down switching regulator with adjustable current limitation
Synchronous rectification with inhibit, 1.5 A, 1.5 MHz adjustable, step-down switching regulator
Synchronous rectification with inhibit, 0.7 A, 1.7 MHz adjustable, step-down switching regulator
Up to 3 A step down switching regulator
3 A DC step-down switching regulator
3A DC step-down switching regulator
4 A step-down switching regulator
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