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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제품설명 단가 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 Pin Count Package Type Switching Regulator Line Regulation
RS 제품 번호 922-2448
제조사 부품 번호LMZ14201HTZE/NOPB
₩17,958.30
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1A 24 V Buck Controller 5 V 6 V 42 V Adjustable Surface Mount - 1 7 TO-PMOD Yes 0.01 %
RS 제품 번호 533-8142
제조사 부품 번호LM2675N-ADJ/NOPB
₩6,268.20
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1A 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Through Hole - 1 8 MDIP Yes -
RS 제품 번호 460-500
제조사 부품 번호LM2576HVS-5.0/NOPB
₩9,706.10
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RS 제품 번호 121-8682
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₩6,475.90
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500mA - Buck Controller, Inverting - 4 V 60 V Fixed Through Hole - 1 8 MDIP Yes -
RS 제품 번호 920-3586
제조사 부품 번호LM2596S-5.0/NOPB
₩7,185.80
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RS 제품 번호 759-1819
제조사 부품 번호ADP2302ARDZ-R7
제조사Analog Devices
₩3,857.95
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2A - Buck Controller - 3 V 20 V Adjustable Surface Mount ADP2302 1 8 SOIC - -
RS 제품 번호 163-2401
제조사 부품 번호LM2575T-ADJG
제조사ON Semiconductor
₩2,673.75
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RS 제품 번호 169-8942
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₩1,461.65
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RS 제품 번호 786-9998
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제조사Analog Devices
₩71,532.50
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8A 5.5 V Buck Controller 0.6 V 4.5 V 26.5 V Adjustable Surface Mount - 2 144 LGA Yes 0.04 %/V
RS 제품 번호 162-5943
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₩7,715.90
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RS 제품 번호 162-5052
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₩4,760.05
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RS 제품 번호 121-6369
제조사 부품 번호LM2596DSADJR4G
제조사ON Semiconductor
₩1,908.05
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3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK Yes -
RS 제품 번호 533-5317
제조사 부품 번호LM2679S-ADJ/NOPB
₩8,800.90
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5A - Buck Controller - 8 V 40 V Adjustable Surface Mount - 1 7 D2PAK (TO-263) Yes -
RS 제품 번호 908-3880
제조사 부품 번호LMR14030SDDA
₩4,009.85
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3.5A 28 V Step Down 0.8 V 4 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS 제품 번호 533-3715
제조사 부품 번호LM2596S-ADJ/NOPB
₩7,833.70
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3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS 제품 번호 162-9814
제조사 부품 번호LMR14050SDDA
₩4,220.65
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5A 28 V Step Down 0.8 V 4 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS 제품 번호 533-3759
제조사 부품 번호LM2596T-ADJ/NOPB
₩7,047.85
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3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS 제품 번호 146-0324
제조사 부품 번호MIC4576WT
제조사Microchip
₩3,856.40
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3A 33 V Buck Regulator 1.23 V 4 V 36 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS 제품 번호 251-3390
제조사 부품 번호L4970A
₩18,923.95
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10A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 30 mV
RS 제품 번호 178-1392
제조사 부품 번호L4970A
₩17,705.65
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10A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 30 mV