Buck Converters


A Buck Converter, also known as a Step-Down Converter, is a DC-to-DC power converter which steps down 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 that 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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Part Details Brand Stock Recently Introduced Maximum Output Current Maximum Output Voltage Regulator Function Minimum Output Voltage Minimum Input Voltage Maximum Input Voltage Converter Type Output Type Series Mounting Type Number of Outputs Pin Count Package Type Line Regulation Load Regulation Maximum Operating Temperature Minimum Operating Temperature Maximum Switching Frequency Length Efficiency Width Dimensions Height
Analog Devices, ADP2503ACPZ-3.3-R7 Step-Down Switching Regulator, 1-Channel 600mA 10-Pin, LFCSP
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Microchip, MIC4684YM-TR Step-Down Switching Regulator, 1-Channel 2A Adjustable 8-Pin, SOP
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Microchip, LM2576WT Adjustable Switching Regulator, 1-Channel 3A Adjustable 5-Pin, TO-220
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Analog Devices, ADP2302ARDZ Step-Down Switching Regulator, 1-Channel 2A Adjustable 8-Pin, SOIC
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Microchip, LM2576-12WU Adjustable Switching Regulator, 1-Channel 3A 5-Pin, D2PAK
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Microchip, MIC4576WU Switching Regulator, 1-Channel 3A Adjustable 5-Pin, D2PAK
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Microchip, LM2575WU Adjustable Switching Regulator, 1-Channel 1A Adjustable 5-Pin, D2PAK
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Microchip, LM2576-12WT Adjustable Switching Regulator, 1-Channel 3A 5-Pin, TO-220
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Microchip, MIC4575WU Switching Regulator, 1-Channel 1A Adjustable 5-Pin, D2PAK
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Allegro Microsystems, A4403GEUTR-T Step-Down Switching Regulator, 1-Channel 3A 16-Pin, QFN
  • £ 1.07
  • Each (On a Reel of 1500)
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QFN Please note that the Stock level on this page is periodically updated during the day.

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2000 kHz Please note that the Stock level on this page is periodically updated during the day.

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4mm Please note that the Stock level on this page is periodically updated during the day.

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Allegro Microsystems, A4447SLJTR-T Step-Down Switching Regulator, 1-Channel 2A Adjustable 8-Pin, SOIC
  • £ 0.81
  • Each (On a Reel of 1000)
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Allegro Microsystems, A8498SLJTR-T Step-Down Switching Regulator, 1-Channel 3A Adjustable 8-Pin, SOIC
  • £ 0.94
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1 Please note that the Stock level on this page is periodically updated during the day.

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8 Please note that the Stock level on this page is periodically updated during the day.

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SOIC Please note that the Stock level on this page is periodically updated during the day.

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805 kHz Please note that the Stock level on this page is periodically updated during the day.

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5mm Please note that the Stock level on this page is periodically updated during the day.

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5 x 4 x 1.65mm Please note that the Stock level on this page is periodically updated during the day.

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Analog Devices Please note that the Stock level on this page is periodically updated during the day.

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5 V Please note that the Stock level on this page is periodically updated during the day.

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2.3 V Please note that the Stock level on this page is periodically updated during the day.

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5.5 V Please note that the Stock level on this page is periodically updated during the day.

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1 Please note that the Stock level on this page is periodically updated during the day.

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10 Please note that the Stock level on this page is periodically updated during the day.

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LFCSP Please note that the Stock level on this page is periodically updated during the day.

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0.6 % Please note that the Stock level on this page is periodically updated during the day.

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2.9 MHz Please note that the Stock level on this page is periodically updated during the day.

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3.1mm Please note that the Stock level on this page is periodically updated during the day.

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3.1 x 3.1 x 0.8mm Please note that the Stock level on this page is periodically updated during the day.

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0.8mm Please note that the Stock level on this page is periodically updated during the day.

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Analog Devices, LT1076CT-5#PBF Switching Regulator, 1-Channel 2A 5-Pin, TO-220
  • £ 5.15
  • Each (In a Tube of 50)
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Buck Controller Please note that the Stock level on this page is periodically updated during the day.

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45 V Please note that the Stock level on this page is periodically updated during the day.

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125 kHz Please note that the Stock level on this page is periodically updated during the day.

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10.54mm Please note that the Stock level on this page is periodically updated during the day.

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10.541 x 4.572 x 15.748mm Please note that the Stock level on this page is periodically updated during the day.

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15.748mm Please note that the Stock level on this page is periodically updated during the day.

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Analog Devices, LT1374CS8#PBF Switching Regulator, 1-Channel 4.5A 8-Pin, SOIC
  • £ 5.18
  • Each (In a Tube of 100)
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Buck Controller Please note that the Stock level on this page is periodically updated during the day.

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25 V Please note that the Stock level on this page is periodically updated during the day.

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8 Please note that the Stock level on this page is periodically updated during the day.

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0.03 %/V Please note that the Stock level on this page is periodically updated during the day.

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0 °C Please note that the Stock level on this page is periodically updated during the day.

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560 kHz Please note that the Stock level on this page is periodically updated during the day.

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5mm Please note that the Stock level on this page is periodically updated during the day.

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5.004 x 3.988 x 1.498mm Please note that the Stock level on this page is periodically updated during the day.

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1.498mm Please note that the Stock level on this page is periodically updated during the day.

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Analog Devices, LT1374IS8#PBF Switching Regulator, 1-Channel 4.5A Adjustable 8-Pin, SOIC
  • £ 7.66
  • Each (In a Tube of 100)
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2.48 V Please note that the Stock level on this page is periodically updated during the day.

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Step Down Please note that the Stock level on this page is periodically updated during the day.

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5 V Please note that the Stock level on this page is periodically updated during the day.

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25 V Please note that the Stock level on this page is periodically updated during the day.

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1 Please note that the Stock level on this page is periodically updated during the day.

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8 Please note that the Stock level on this page is periodically updated during the day.

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SOIC Please note that the Stock level on this page is periodically updated during the day.

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0.03 %/V Please note that the Stock level on this page is periodically updated during the day.

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-40 °C Please note that the Stock level on this page is periodically updated during the day.

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560 kHz Please note that the Stock level on this page is periodically updated during the day.

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5mm Please note that the Stock level on this page is periodically updated during the day.

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- 3.988mm Please note that the Stock level on this page is periodically updated during the day.

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5.004 x 3.988 x 1.498mm Please note that the Stock level on this page is periodically updated during the day.

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1.498mm Please note that the Stock level on this page is periodically updated during the day.

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Analog Devices, LT1375CS8#PBF Switching Regulator, 1-Channel 1.5A 8-Pin, SOIC
  • £ 4.85
  • Each (In a Tube of 100)
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Buck Controller Please note that the Stock level on this page is periodically updated during the day.

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25 V Please note that the Stock level on this page is periodically updated during the day.

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1 Please note that the Stock level on this page is periodically updated during the day.

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8 Please note that the Stock level on this page is periodically updated during the day.

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SOIC Please note that the Stock level on this page is periodically updated during the day.

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0.03 %/V Please note that the Stock level on this page is periodically updated during the day.

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- +125 °C Please note that the Stock level on this page is periodically updated during the day.

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0 °C Please note that the Stock level on this page is periodically updated during the day.

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570 kHz Please note that the Stock level on this page is periodically updated during the day.

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5mm Please note that the Stock level on this page is periodically updated during the day.

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- 3.988mm Please note that the Stock level on this page is periodically updated during the day.

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5.004 x 3.988 x 1.498mm Please note that the Stock level on this page is periodically updated during the day.

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1.498mm Please note that the Stock level on this page is periodically updated during the day.

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Analog Devices, LT1376CS8#PBF Step-Down Switching Regulator, 1-Channel 1.5A Adjustable 8-Pin, SOIC
  • £ 4.85
  • Each (In a Tube of 100)
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- Buck Controller Please note that the Stock level on this page is periodically updated during the day.

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25 V Please note that the Stock level on this page is periodically updated during the day.

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1 Please note that the Stock level on this page is periodically updated during the day.

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8 Please note that the Stock level on this page is periodically updated during the day.

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SOIC Please note that the Stock level on this page is periodically updated during the day.

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0.03 %/V Please note that the Stock level on this page is periodically updated during the day.

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0 °C Please note that the Stock level on this page is periodically updated during the day.

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560 kHz Please note that the Stock level on this page is periodically updated during the day.

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5 x 3.99 x 1.48mm Please note that the Stock level on this page is periodically updated during the day.

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Analog Devices, LT1676CS8#PBF Switching Regulator, 1-Channel 1A 8-Pin, SOIC
  • £ 4.05
  • Each (In a Tube of 100)
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Analog Devices Please note that the Stock level on this page is periodically updated during the day.

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Check Stock Levels - 1A Please note that the Stock level on this page is periodically updated during the day.

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30 V Please note that the Stock level on this page is periodically updated during the day.

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Buck Controller Please note that the Stock level on this page is periodically updated during the day.

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60 V Please note that the Stock level on this page is periodically updated during the day.

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- - - Surface Mount Please note that the Stock level on this page is periodically updated during the day.

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1 Please note that the Stock level on this page is periodically updated during the day.

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8 Please note that the Stock level on this page is periodically updated during the day.

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SOIC Please note that the Stock level on this page is periodically updated during the day.

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0.01 %/V Please note that the Stock level on this page is periodically updated during the day.

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- +125 °C Please note that the Stock level on this page is periodically updated during the day.

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0 °C Please note that the Stock level on this page is periodically updated during the day.

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115 kHz Please note that the Stock level on this page is periodically updated during the day.

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5mm Please note that the Stock level on this page is periodically updated during the day.

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- 3.988mm Please note that the Stock level on this page is periodically updated during the day.

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5.004 x 3.988 x 1.498mm Please note that the Stock level on this page is periodically updated during the day.

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1.498mm Please note that the Stock level on this page is periodically updated during the day.

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