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.

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Beskrivning Pris Maximum Output Current Maximum Output Voltage Regulator Function Minimum Output Voltage Minimum Input Voltage Maximum Input Voltage Output Type Mounting Type Series Number of Outputs Maximum Switching Frequency Pin Count Package Type Switching Regulator
RS-artikelnummer 533-5042
Tillv. art.nrLM2675M-5.0/NOPB
VarumärkeTexas Instruments
71,98 kr
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1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 260 kHz 8 SOIC Yes
RS-artikelnummer 121-6363
Tillv. art.nrLM2576D2T-ADJG
Varumärkeonsemi
26,165 kr
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3A 37 V Buck Controller 1.23 V - 40 V Adjustable Surface Mount - 1 52 kHz 5 D2PAK Yes
RS-artikelnummer 100-0684
Tillv. art.nrLM2575S-ADJ/NOPB
VarumärkeTexas Instruments
44,201 kr
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1A 37 V Buck Controller, Inverting 1.23 V 4 V 40 V Adjustable Surface Mount - 1 58 kHz 5 D2PAK (TO-263) Yes
RS-artikelnummer 920-3665
Tillv. art.nrLM2675M-5.0/NOPB
VarumärkeTexas Instruments
60,967 kr
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1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 260 kHz 8 SOIC Yes
RS-artikelnummer 786-2366
Tillv. art.nrLM2576D2T-ADJG
Varumärkeonsemi
32,142 kr
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3A 37 V Buck Controller 1.23 V - 40 V Adjustable Surface Mount - 1 52 kHz 5 D2PAK Yes
RS-artikelnummer 460-506
Tillv. art.nrLM2575S-ADJ/NOPB
VarumärkeTexas Instruments
52,082 kr
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1A 37 V Buck Controller, Inverting 1.23 V 4 V 40 V Adjustable Surface Mount - 1 58 kHz 5 D2PAK (TO-263) Yes
RS-artikelnummer 825-7018
Tillv. art.nrTPS62740DSST
VarumärkeTexas Instruments
19,62 kr
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300mA 3.3 V Buck 1.8 V 2.2 V 5.5 V Adjustable Surface Mount - 1 2 MHz 12 WSON -
RS-artikelnummer 121-9753
Tillv. art.nrTPS62740DSST
VarumärkeTexas Instruments
11,855 kr
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300mA 3.3 V Buck 1.8 V 2.2 V 5.5 V Adjustable Surface Mount - 1 2 MHz 12 WSON -
RS-artikelnummer 920-3558
Tillv. art.nrLM2594HVN-ADJ/NOPB
VarumärkeTexas Instruments
59,828 kr
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500mA 57 V Buck Controller, Inverting 1.2 V 4.5 V 60 V Adjustable Through Hole - 1 173 kHz 8 MDIP Yes
RS-artikelnummer 920-3637
Tillv. art.nrLM2672M-ADJ/NOPB
VarumärkeTexas Instruments
57,332 kr
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1A 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Surface Mount - 1 260 kHz 8 SOIC Yes
RS-artikelnummer 822-9906
Tillv. art.nrLT3990EMSE#PBF
VarumärkeAnalog Devices
93,63 kr
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350mA 5 V Step Down 1.195 V 4.2 V 62 V Adjustable Surface Mount - 1 2.76 MHz 16 MSOP Yes
RS-artikelnummer 533-3541
Tillv. art.nrLM2594HVN-ADJ/NOPB
VarumärkeTexas Instruments
67,08 kr
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500mA 57 V Buck Controller, Inverting 1.2 V 4.5 V 60 V Adjustable Through Hole - 1 173 kHz 8 MDIP Yes
RS-artikelnummer 146-5626
Tillv. art.nrLNK304PN
VarumärkePower Integrations
8,887 kr
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170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 70 kHz 7 DIPB -
RS-artikelnummer 533-4077
Tillv. art.nrLM2672M-ADJ/NOPB
VarumärkeTexas Instruments
80,73 kr
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1A 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Surface Mount - 1 260 kHz 8 SOIC Yes
RS-artikelnummer 165-4042
Tillv. art.nrMCP16301HT-E/CH
VarumärkeMicrochip
11,619 kr
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600mA 15 V Step Down 2 V 4.7 V 36 V Adjustable Surface Mount - 1 550 kHz 6 SOT-23 Yes
RS-artikelnummer 660-6083
Tillv. art.nrLM22674MRE-ADJ/NOPB
VarumärkeTexas Instruments
14,56 kr
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500mA - Buck Controller 1.258 V 4.5 V 42 V Adjustable Surface Mount - 1 600 kHz 8 PSOP Yes
RS-artikelnummer 379-921
Tillv. art.nrL5970D
VarumärkeSTMicroelectronics
45,492 kr
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1A 35 V Buck Controller 1.2 V 4.4 V 36 V Adjustable Surface Mount - 1 275 kHz 8 SOIC Yes
RS-artikelnummer 463-050
Tillv. art.nrLM2576T-ADJG
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29,902 kr
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3A 37 V Buck Controller, Inverting 1.23 V 7 V 40 V Adjustable Through Hole - 1 52 kHz 5 TO-220 Yes
RS-artikelnummer 145-8601
Tillv. art.nrL5970D
VarumärkeSTMicroelectronics
30,032 kr
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1A 35 V Buck Controller 1.2 V 4.4 V 36 V Adjustable Surface Mount - 1 275 kHz 8 SOIC Yes
RS-artikelnummer 922-2448
Tillv. art.nrLMZ14201HTZE/NOPB
VarumärkeTexas Instruments
161,313 kr
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1A 24 V Buck Controller 5 V 6 V 42 V Adjustable Surface Mount - 1 1 MHz 7 TO-PMOD Yes