Buck Converters | Step-Down Switch Regulator | RS
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    Buck Converters

    A Buck Converter, also known as a Step-Down Converter, is a DC-to-DC power converter that steps down the voltage from its input to its output. A buck converter integrates the core components and circuitry needed into a single device.

    Buck converters are found in countless electronic applications, where their power regulation properties are a vital component.

    How does a Buck Converter work?

    A Buck Converter is a type of switch-mode power supply, a class of device that incorporates a switch (e.g. typically a MOSFET) to rapidly turn the circuit on and off. This rapid switching creates a square wave. If the duty cycle of the switch is set to 50%, i.e. the switch is on 50% of the time, the average voltage will be 50% of the input.

    The square wave needs to be smoothed to provide useful power, typically an inductor and capacitor are used in series to fulfil this function. This combination is called an LC low pass filter. The properties of an inductor smooth the current flow, while the capacitor resists sudden changes in voltage. The combined effect produces a relatively smooth voltage output with low ripple. For example, if the input voltage is 10V and the switch employs a duty cycle of 50%, the output voltage will be 5V.

    A further necessary component of a Buck Converter is to incorporate a diode or other switch in parallel with the inductor. This is to compensate for the property of an inductor, in that the current in an inductor cannot instantly change, protecting the switching transistor from being overloaded and destroyed.

    Buck Converters also incorporate additional circuitry to ensure a stable output voltage. The converter uses a closed-loop control scheme with negative feedback to monitor the voltage output and dynamically adjusts the duty cycle of the switch to regulate the output voltage.

    Design considerations

    • Buck Converters are very efficient, with some devices offering efficiencies of above 95%.
    • Buck Converters can be more cost-effective than linear regulators at higher power levels, the cost of removing the heat generated by a linear regulator may be less than employing a Buck Converter.
    • The output of a Buck Converter will feature a noise, meaning the more stable output of a linear voltage regulator is better suited for application requiring low output noise.
    • Linear regulators can respond faster to input and output changes versus a buck converter.

    1131 產品顯示為 Buck Converters

    Texas Instruments
    Switching Regulator
    300mA
    10 V
    Step Down
    1.2 V
    3 V
    17 V
    Adjustable
    Surface Mount
    -
    1
    1 MHz
    8
    WSON
    -0.05 %/V
    -0.0004 %/mA
    Texas Instruments
    Switching Regulator
    1.5A
    -
    Buck Controller, Inverting
    -
    6 V
    42 V
    Adjustable
    Surface Mount
    -
    1
    1000 kHz
    16
    TSSOP
    -
    -
    Texas Instruments
    Switching Regulator
    1A
    6 V
    Buck Controller
    0.6 V
    2.3 V
    6 V
    Adjustable
    Surface Mount
    -
    1
    2250 kHz
    6
    SON
    -
    -0.5 %/A
    Texas Instruments
    -
    600mA
    7.6 V
    -
    1.225 V
    7.5 V
    -
    Adjustable
    -
    -
    1
    -
    8
    WSON-8
    -
    -
    onsemi
    Switching Regulator
    1A
    3.3 V
    Buck Controller
    -
    4.75 V
    40 V
    Fixed
    Through Hole
    -
    1
    52 kHz
    5
    TO-220
    -
    -
    Texas Instruments
    Switching Regulator
    -
    16 V
    Step Up
    -
    2.7 V
    14 V
    Adjustable
    Surface Mount
    -
    1
    600 kHz
    5
    SOT-23
    -
    -
    Microchip
    Switching Regulator
    2A
    -
    Buck Controller
    1.235 V
    4 V
    30 V
    Adjustable
    Surface Mount
    -
    1
    225 kHz
    8
    SOP
    -
    -
    ROHM
    -
    3.5A
    42 V
    Buck Controller
    0.8 V
    4.5 V
    -
    -
    -
    -
    1
    -
    8
    HTSOP-J8ES
    -
    -
    Texas Instruments
    -
    3A
    57 V
    -
    1.2 V
    4.5 V
    -
    Adjustable
    -
    -
    1
    -
    5
    TO-263-5
    -
    -
    ROHM
    Switching Regulator
    3A
    32 V
    Buck Converter
    1 V
    8 V
    35 V
    Adjustable
    Through Hole
    -
    1
    132 kHz
    5 + Tab
    TO- 220FP
    100 mV
    40 mV
    Texas Instruments
    -
    600mA
    3.3 V
    -
    1.1 V
    2.7 V
    5.5 V
    Adjustable
    Surface Mount
    -
    1
    2.6 MHz
    5
    SOT-23
    0.031 %/V
    0.0013 %/mV
    Texas Instruments
    Switching Regulator
    15A
    5.5 V
    Step Down
    0.6 V
    1.5 V
    20 V
    Adjustable
    Surface Mount
    -
    1
    1 MHz
    28
    VQFN-CLIP
    -
    -
    STMicroelectronics
    Switching Regulator
    1.5A
    35 V
    Buck Controller
    1.235 V
    4.4 V
    36 V
    Adjustable
    Surface Mount
    -
    1
    275 kHz
    8
    SOIC
    -
    -
    Texas Instruments
    -
    -
    -
    -
    -
    2.7 V
    5.5 V
    Adjustable
    Surface Mount
    -
    -
    3 MHz
    8
    USiP
    0.16 %
    0.15 %
    Texas Instruments
    Switching Regulator
    500mA
    -
    Buck Controller
    -
    3.5 V
    60 V
    Adjustable
    Surface Mount
    -
    1
    2500 kHz
    10
    HTSSOP
    -
    -
    Texas Instruments
    -
    10A
    5 V
    Step Down Converter
    0.6 V
    4.5 V
    -
    Adjustable
    -
    -
    1
    -
    15 Pin
    VQFN-HR
    -
    -
    Renesas Electronics
    -
    800mA
    12 V
    Buck
    1.8 V
    3 V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Texas Instruments
    Switching Regulator
    2A
    7 V
    Step Down, Synchronous Voltage Converter
    0.76 V
    4.5 V
    17 V
    Adjustable
    Surface Mount
    -
    1
    650 kHz
    6
    SOT-23
    -
    -
    Texas Instruments
    -
    10A
    5 V
    Step Down Converter
    0.6 V
    4.5 V
    -
    Adjustable
    -
    -
    1
    -
    15 Pin
    VQFN-HR
    -
    -
    Renesas Electronics
    -
    2A
    -
    Buck Regulator
    -
    2.8 V
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
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