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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Omschrijving Prijs 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-stocknr. 146-5628
FabrikantnummerLNK304GN
0,742 €
Each (In a Tube of 50)
Aantal stuks
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS-stocknr. 146-5626
FabrikantnummerLNK304PN
0,744 €
Each (In a Tube of 50)
Aantal stuks
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS-stocknr. 146-5637
FabrikantnummerLNK305GN
0,883 €
Each (In a Tube of 50)
Aantal stuks
280mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS-stocknr. 920-3627
FabrikantnummerLM2671M-5.0/NOPB
3,567 €
Each (In a Tube of 95)
Aantal stuks
500mA - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 533-4011
FabrikantnummerLM2671M-5.0/NOPB
4,20 €
Each
Aantal stuks
500mA - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 146-5633
FabrikantnummerLNK305PN
0,854 €
Each (In a Tube of 50)
Aantal stuks
280mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS-stocknr. 145-7114
FabrikantnummerDCP010505DBP-U
8,666 €
Each (In a Tube of 25)
Aantal stuks
100mA ±5.75 V Buck Controller ±4.25 V 4.5 V 5.5 V Fixed Surface Mount - 2 7 SOP Yes 15 %
RS-stocknr. 537-9547
FabrikantnummerLM3671MF-ADJ/NOPB
1,32 €
Each
Aantal stuks
600mA 3.3 V Buck Controller 1.1 V 2.7 V 5.5 V Adjustable Surface Mount - 1 5 SOT-23 Yes 0.031 %/V
RS-stocknr. 921-2772
FabrikantnummerLMZ31710RVQT
13,874 €
Each (In a Tube of 250)
Aantal stuks
10A 5.5 V Buck Controller 0.6 V 2.95 V 17 V Adjustable Surface Mount - 1 42 BQFN Yes ±0.1 %
RS-stocknr. 798-1293
FabrikantnummerLMZ31710RVQT
10,31 €
Each
Aantal stuks
10A 5.5 V Buck Controller 0.6 V 2.95 V 17 V Adjustable Surface Mount - 1 42 BQFN Yes ±0.1 %
RS-stocknr. 162-4721
FabrikantnummerLM3671MF-ADJ/NOPB
0,644 €
Each (On a Reel of 1000)
Aantal stuks
600mA 3.3 V Buck Controller 1.1 V 2.7 V 5.5 V Adjustable Surface Mount - 1 5 SOT-23 Yes 0.031 %/V
RS-stocknr. 620-0868
FabrikantnummerDCP010505DBP-U
8,87 €
Each
Aantal stuks
100mA ±5.75 V Buck Controller ±4.25 V 4.5 V 5.5 V Fixed Surface Mount - 2 7 SOP Yes 15 %
RS-stocknr. 779-9384
FabrikantnummerLT1676CS8#PBF
FabrikantAnalog Devices
5,515 €
Each (In a Pack of 2)
Aantal stuks
1A 30 V Buck Controller 5 V 7.4 V 60 V - Surface Mount - 1 8 SOIC Yes 0.01 %/V
RS-stocknr. 533-8013
FabrikantnummerLM2574N-5.0/NOPB
3,14 €
Each
Aantal stuks
500mA - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 8 MDIP Yes -
RS-stocknr. 533-5121
FabrikantnummerLM2676S-ADJ/NOPB
5,82 €
Each
Aantal stuks
3A 37 V Buck Controller 1.2 V 8 V 40 V Adjustable Surface Mount - 1 7 D2PAK (TO-263) Yes -
RS-stocknr. 100-3975
FabrikantnummerLM2574N-5.0/NOPB
2,676 €
Each (In a Tube of 40)
Aantal stuks
500mA - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 8 MDIP Yes -
RS-stocknr. 506-0580
FabrikantnummerLT1934ES6#TRMPBF
FabrikantAnalog Devices
5,27 €
Each
Aantal stuks
300mA - Buck Controller - 3.2 V 34 V Fixed Surface Mount - 1 6 TSOT-23 Yes 0.007 %/V
RS-stocknr. 121-9375
FabrikantnummerTPS62175DQCT
0,976 €
Each (On a Reel of 250)
Aantal stuks
500mA 6 V - 1 V 4.75 V 28 V Adjustable Surface Mount - 1 10 WSON Yes 0.015 %/V
RS-stocknr. 100-3942
FabrikantnummerLM2676S-ADJ/NOPB
4,939 €
Each (In a Tube of 45)
Aantal stuks
3A 37 V Buck Controller 1.2 V 8 V 40 V Adjustable Surface Mount - 1 7 D2PAK (TO-263) Yes -
RS-stocknr. 162-9889
FabrikantnummerTPS563209DDCT
0,59 €
Each (On a Reel of 250)
Aantal stuks
3A 7 V Synchronous Step Down 0.76 V 4.5 V 17 V Adjustable Surface Mount - 1 6 SOT-23 Yes -