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. 200-3853
FabrikantnummerMAX17576ATG+
FabrikantMaxim Integrated
2,387 €
Each (In a Tray of 490)
Aantal stuks
4A 60 V - 4.5 V 0.9 V - Adjustable - - - 24 TQFN - -
Nieuw
RS-stocknr. 216-7826
FabrikantnummerMAXM17633AMG+T
FabrikantMaxim Integrated
3,715 €
Each (In a Pack of 2)
Aantal stuks
1A 3.3 V Buck Converter 0.9 V 4.5 V - Fixed - - 1 24 USLIC - -
Nieuw
RS-stocknr. 216-7821
FabrikantnummerMAXM17631AME+T
FabrikantMaxim Integrated
2,88 €
Each (In a Pack of 2)
Aantal stuks
1A 5 V Buck Converter 3.3 V 4.5 V - Fixed - - 1 16 USLIC - -
Nieuw
RS-stocknr. 216-7790
FabrikantnummerMAX18066EWE+T
FabrikantMaxim Integrated
2,822 €
Each (In a Pack of 5)
Aantal stuks
4A 3.3 V Buck Converter 0.6 V 4.5 V - Adjustable - - 1 16 WLP - -
Nieuw
RS-stocknr. 216-7822
FabrikantnummerMAXM17632AME+T
FabrikantMaxim Integrated
2,753 €
Each (On a Reel of 2500)
Aantal stuks
1A 12 V Buck Converter 0.9 V 4.5 V - Adjustable - - 1 16 USLIC - -
RS-stocknr. 200-3854
FabrikantnummerMAX17576ATG+
FabrikantMaxim Integrated
4,14 €
Each (In a Pack of 2)
Aantal stuks
4A 60 V - 4.5 V 0.9 V - Adjustable - - - 24 TQFN - -
RS-stocknr. 204-2483
FabrikantnummerMAXM17635AMG+
FabrikantMaxim Integrated
4,462 €
Each (On a Tape of 10)
Aantal stuks
2 12 Buck Converter 0.9 4.5 - Adjustable - - 1 24 USLIC - -
Nieuw
RS-stocknr. 216-7825
FabrikantnummerMAXM17633AMG+T
FabrikantMaxim Integrated
3,707 €
Each (On a Reel of 2500)
Aantal stuks
1A 3.3 V Buck Converter 0.9 V 4.5 V - Fixed - - 1 24 USLIC - -
RS-stocknr. 189-7002
FabrikantnummerMAX766ESA+
FabrikantMaxim Integrated
4,151 €
Each (In a Tube of 100)
Aantal stuks
105mA -16 V Boost/Buck Controller, Inverting, Non-Inverting -1 V 3 V 16 V Adjustable, Fixed Surface Mount - 1 8 SOIC Yes 0.12 %/mV
Nieuw
RS-stocknr. 212-3263
FabrikantnummerMAX77533AEWC+T
FabrikantMaxim Integrated
0,438 €
Each (On a Reel of 2500)
Aantal stuks
1.5A 1.8 V Buck Converter 0.8 V 3 V - Adjustable - - 1 12 12-WLP - -
RS-stocknr. 190-0509
FabrikantnummerMAX797HESE+
FabrikantMaxim Integrated
12,20 €
Each
Aantal stuks
10A 6 V Step Down 2.5 V 4.5 V 30 V Adjustable Surface Mount - 1 16 SOIC - 0.06 %/V
Nieuw
RS-stocknr. 212-2538
FabrikantnummerMAX20010EATPA/V+
FabrikantMaxim Integrated
4,174 €
Each (In a Tube of 75)
Aantal stuks
6A 1.5875 V Buck 0.5 V 3 V - - - - - 20 TQFN-EP - -
Nieuw
RS-stocknr. 216-7829
FabrikantnummerMAXM17635AMG+T
FabrikantMaxim Integrated
3,996 €
Each (On a Reel of 2500)
Aantal stuks
1A 12 V Buck Converter 0.9 V 4.5 V - Adjustable - - 1 24 USLIC - -
Nieuw
RS-stocknr. 214-9152
FabrikantnummerMAX20004EAFOB/VY+
FabrikantMaxim Integrated
1,843 €
Each (In a Tray of 420)
Aantal stuks
4A 5 V Synchronous Buck Converter 36 V 3 V - Fixed - - 1 17 FC2QFN - -
Nieuw
RS-stocknr. 216-7827
FabrikantnummerMAXM17634AMG+T
FabrikantMaxim Integrated
3,996 €
Each (On a Reel of 2500)
Aantal stuks
1A 5 V Buck Converter 0.9 V 4.5 V - Fixed - - 1 24 USLIC - -
RS-stocknr. 204-4482
FabrikantnummerMAX16926GTP/V+
FabrikantMaxim Integrated
3,15 €
Each (In a Pack of 5)
Aantal stuks
2.1A 440 V Buck Converter 3.36 V 36 V - Selectable - - 4 20 TQFN-EP - -
Nieuw
RS-stocknr. 214-9155
FabrikantnummerMAX20006EAFOB/VY+
FabrikantMaxim Integrated
3,54 €
Each (In a Pack of 5)
Aantal stuks
6A 5 V Synchronous Buck Converter 36 V 3 V - Fixed - - 1 17 FC2QFN - -
Nieuw
RS-stocknr. 216-7792
FabrikantnummerMAX18166EWE+T
FabrikantMaxim Integrated
1,856 €
Each (In a Pack of 5)
Aantal stuks
4A 3.3 V Buck Converter 0.6 V 4.5 V - Adjustable - - 1 16 WLP - -
RS-stocknr. 204-2533
FabrikantnummerMAXM17631AME+
FabrikantMaxim Integrated
2,906 €
Each (On a Tape of 10)
Aantal stuks
1A 5 V Buck Converter 3.3 V 4.5 V - Selectable - - 1 16 USLIC - -
RS-stocknr. 204-4314
FabrikantnummerMAX20030BATMA/V+
FabrikantMaxim Integrated
10,61 €
Each
Aantal stuks
400mA 10 V Buck Controller 1.5 V 3.5 V - Adjustable - - 2 48 QFND, TQFN - -