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. 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. 506-0580
FabrikantnummerLT1934ES6#TRMPBF
FabrikantAnalog Devices
4,87 €
Each
Aantal stuks
300mA - Buck Controller - 3.2 V 34 V Fixed Surface Mount - 1 6 TSOT-23 Yes 0.007 %/V
RS-stocknr. 711-2563
FabrikantnummerLT3507EUHF#PBF
FabrikantAnalog Devices
8,40 €
Each
Aantal stuks
2.4A - - - 4 V 36 V Adjustable Surface Mount - 3 38 QFN - 0.01 %/V
RS-stocknr. 786-9922
FabrikantnummerLTC3417AEFE#PBF
FabrikantAnalog Devices
7,22 €
Each
Aantal stuks
1.4A 5 V Buck Controller 0.8 V 2.25 V 5.5 V Adjustable Surface Mount - 1 20 TSSOP Yes 0.2 %/V
RS-stocknr. 786-9998
FabrikantnummerLTM4628IV#PBF
FabrikantAnalog Devices
24,23 €
Each
Aantal stuks
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-stocknr. 159-7583
FabrikantnummerADP2300AUJZ-R7
FabrikantAnalog Devices
0,954 €
Each (On a Reel of 3000)
Aantal stuks
1.2A - Buck Controller - 3 V 20 V Adjustable Surface Mount - 1 6 TSOT - -
RS-stocknr. 761-8585
FabrikantnummerLT1976EFE#PBF
FabrikantAnalog Devices
7,91 €
Each
Aantal stuks
3.5A 35 V - 1.25 V 3.3 V 60 V Adjustable Surface Mount - 1 16 TSSOP Yes -
RS-stocknr. 786-9657
FabrikantnummerLT3970EMS-3.3#PBF
FabrikantAnalog Devices
5,15 €
Each (In a Pack of 2)
Aantal stuks
350mA 3.3 V Buck Controller - 4.2 V 40 V Fixed Surface Mount - 1 10 MSOP Yes 0.01 %/V
RS-stocknr. 779-9647
FabrikantnummerLT3505EDD#PBF
FabrikantAnalog Devices
4,745 €
Each (In a Pack of 2)
Aantal stuks
1.2A 50 V Buck Controller 0.78 V 3.6 V 36 V - Surface Mount - 1 8 DFN Yes 0.007 %/V
RS-stocknr. 786-9749
FabrikantnummerLT8610EMSE#PBF
FabrikantAnalog Devices
7,38 €
Each
Aantal stuks
2.5A 12 V Synchronous Buck Controller 0.97 V 3.4 V 42 V Adjustable Surface Mount - 1 16 MSOP Yes 0.02 %/V
RS-stocknr. 884-2543
FabrikantnummerLTM8032EY#PBF
FabrikantAnalog Devices
23,57 €
Each
Aantal stuks
2A 10 V Step Down 0.8 V 3.6 V 36 V - Surface Mount - 1 71 BGA Yes 0.1 %
RS-stocknr. 506-2003
FabrikantnummerLTC3728EG#PBF
FabrikantAnalog Devices
9,88 €
Each
Aantal stuks
- - - 0.8 V 3.5 V 30 V - Surface Mount - 2 28 SSOP - -
RS-stocknr. 858-0668
FabrikantnummerLTC3611EWP#PBF
FabrikantAnalog Devices
19,71 €
Each
Aantal stuks
100A - Step Down - 4.5 V 32 V Adjustable Surface Mount - 1 64 QFN Yes 0.002 %/V
RS-stocknr. 917-3466
FabrikantnummerLT3470ETS8#TRMPBF
FabrikantAnalog Devices
3,105 €
Each (On a Reel of 500)
Aantal stuks
200mA 16 V Buck Controller 1.25 V 4 V 40 V Adjustable Surface Mount - - 8 TSOT-23 Yes -
RS-stocknr. 711-2560
FabrikantnummerLT3480EMSE#PBF
FabrikantAnalog Devices
7,38 €
Each
Aantal stuks
2A 20 V Buck Controller 0.79 V 3.6 V 36 V Adjustable Surface Mount - 1 10 MSOP Yes 0.01 %/V
RS-stocknr. 423-567
FabrikantnummerLT3470ETS8#TRMPBF
FabrikantAnalog Devices
5,26 €
Each
Aantal stuks
200mA 16 V Buck Controller 1.25 V 4 V 40 V Adjustable Surface Mount - - 8 TSOT-23 Yes -
RS-stocknr. 787-0001
FabrikantnummerLTM8021IV#PBF
FabrikantAnalog Devices
11,20 €
Each
Aantal stuks
500mA 5 V Buck Controller 0.8 V 3 V 36 V Adjustable Surface Mount - 1 35 LGA Yes 0.5 %
RS-stocknr. 779-9249
FabrikantnummerLT1375CS8#PBF
FabrikantAnalog Devices
5,91 €
Each
Aantal stuks
1.5A 5 V Buck Controller - 5 V 25 V - Surface Mount - 1 8 SOIC Yes 0.03 %/V
RS-stocknr. 545-7108
FabrikantnummerLTC1435ACS#PBF
FabrikantAnalog Devices
8,19 €
Each
Aantal stuks
- - - - - - - Surface Mount - - 16 SOIC - -
RS-stocknr. 779-9640
FabrikantnummerLT3502AEMS#PBF
FabrikantAnalog Devices
4,25 €
Each (In a Pack of 2)
Aantal stuks
500mA 3.3 V, 7 V Buck Controller 0.8 V 3 V 40 V - Surface Mount - 1 10 MSOP Yes 0.005 %/V