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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Description Price 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
New
RS Stock No. 216-7819
Mfr. Part No.MAXM17630AME+T
SGD7.325
Each (In a Pack of 2)
units
1A 3.3 V Buck Converter 3.3 V 4.5 V - Fixed - - 1 16 USLIC - -
New
RS Stock No. 216-7825
Mfr. Part No.MAXM17633AMG+T
SGD5.898
Each (On a Reel of 2500)
units
1A 3.3 V Buck Converter 0.9 V 4.5 V - Fixed - - 1 24 USLIC - -
New
RS Stock No. 216-7831
Mfr. Part No.MAXM17635AMG+T
SGD8.74
Each (In a Pack of 2)
units
1A 12 V Buck Converter 0.9 V 4.5 V - Adjustable - - 1 24 USLIC - -
New
RS Stock No. 216-7817
Mfr. Part No.MAXM17630AME+T
SGD4.462
Each (On a Reel of 2500)
units
1A 3.3 V Buck Converter 3.3 V 4.5 V - Fixed - - 1 16 USLIC - -
RS Stock No. 204-4317
Mfr. Part No.MAX20031BATMA/V+
SGD14.57
Each
units
400mA 10 V Buck Controller 1.5 V 3.5 V - Adjustable - - 2 48 QFND, TQFN - -
New
RS Stock No. 212-3263
Mfr. Part No.MAX77533AEWC+T
SGD0.823
Each (On a Reel of 2500)
units
1.5A 1.8 V Buck Converter 0.8 V 3 V - Adjustable - - 1 12 12-WLP - -
New
RS Stock No. 212-3264
Mfr. Part No.MAX77533AEWC+T
SGD1.377
Each (In a Pack of 10)
units
1.5A 1.8 V Buck Converter 0.8 V 3 V - Adjustable - - 1 12 12-WLP - -
New
RS Stock No. 214-9155
Mfr. Part No.MAX20006EAFOB/VY+
SGD5.11
Each (In a Pack of 5)
units
6A 5 V Synchronous Buck Converter 36 V 3 V - Fixed - - 1 17 FC2QFN - -
New
RS Stock No. 216-7826
Mfr. Part No.MAXM17633AMG+T
SGD8.74
Each (In a Pack of 2)
units
1A 3.3 V Buck Converter 0.9 V 4.5 V - Fixed - - 1 24 USLIC - -
RS Stock No. 190-0509
Mfr. Part No.MAX797HESE+
SGD19.17
Each
units
10A 6 V Step Down 2.5 V 4.5 V 30 V Adjustable Surface Mount - 1 16 SOIC - 0.06 %/V
New
RS Stock No. 216-7821
Mfr. Part No.MAXM17631AME+T
SGD7.325
Each (In a Pack of 2)
units
1A 5 V Buck Converter 3.3 V 4.5 V - Fixed - - 1 16 USLIC - -
New
RS Stock No. 212-2539
Mfr. Part No.MAX20010EATPA/V+
SGD8.665
Each (In a Pack of 2)
units
6A 1.5875 V Buck 0.5 V 3 V - - - - - 20 TQFN-EP - -
RS Stock No. 204-2491
Mfr. Part No.MAX18066EWE+
SGD3.993
Each (On a Tape of 10)
units
4.5A 3.3 V Buck Converter 0.6 V 4.5 V - Adjustable - - 1 16 WLP - -
New
RS Stock No. 216-7790
Mfr. Part No.MAX18066EWE+T
SGD4.428
Each (In a Pack of 5)
units
4A 3.3 V Buck Converter 0.6 V 4.5 V - Adjustable - - 1 16 WLP - -
RS Stock No. 190-0598
Mfr. Part No.MAX764CPA+
SGD7.365
Each (In a Pack of 2)
units
260mA -16 V Buck Controller -1 V 3 V 16 V Adjustable, Fixed Through Hole - 1 8 PDIP Yes 0.12 %/mV
New
RS Stock No. 216-7828
Mfr. Part No.MAXM17634AMG+T
SGD8.74
Each (In a Pack of 2)
units
1A 5 V Buck Converter 0.9 V 4.5 V - Fixed - - 1 24 USLIC - -
RS Stock No. 204-2479
Mfr. Part No.MAXM17633AMG+
SGD7.946
Each (On a Tape of 10)
units
2 12 Buck Converter 0.9 4.5 - Adjustable - - 1 24 USLIC - -
New
RS Stock No. 216-7815
Mfr. Part No.MAXM15068AMB+T
SGD4.52
Each (On a Reel of 2500)
units
200mA 12 V Buck Converter 5 V 7.5 V - Adjustable - - 1 10 USLIC - -
RS Stock No. 189-6995
Mfr. Part No.MAX764CPA+
SGD6.069
Each (In a Tube of 50)
units
260mA -16 V Buck Controller -1 V 3 V 16 V Adjustable, Fixed Through Hole - 1 8 PDIP Yes 0.12 %/mV
RS Stock No. 204-4316
Mfr. Part No.MAX20031BATMA/V+
SGD12.263
Each (In a Tube of 43)
units
400mA 10 V Buck Controller 1.5 V 3.5 V - Adjustable - - 2 48 QFND, TQFN - -