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 Prix 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
Nouveau
N° de stock RS 216-7817
Référence fabricantMAXM17630AME+T
2,599 €
Each (On a Reel of 2500)
Unité
1A 3.3 V Buck Converter 3.3 V 4.5 V - Fixed - - 1 16 USLIC - -
N° de stock RS 204-4481
Référence fabricantMAX16926GTP/V+
1,915 €
Each (In a Tube of 75)
Unité
2.1A 440 V Buck Converter 3.36 V 36 V - Selectable - - 4 20 TQFN-EP - -
N° de stock RS 204-2479
Référence fabricantMAXM17633AMG+
4,372 €
Each (On a Tape of 10)
Unité
2 12 Buck Converter 0.9 4.5 - Adjustable - - 1 24 USLIC - -
N° de stock RS 190-0485
Référence fabricantMAX1791EUB+
4,295 €
Each (In a Pack of 2)
Unité
2A 5.5 V Step Down 0.5 V 5 V 20 V Adjustable Surface Mount - 1 10 μMAX Yes -
Nouveau
N° de stock RS 216-7819
Référence fabricantMAXM17630AME+T
4,265 €
Each (In a Pack of 2)
Unité
1A 3.3 V Buck Converter 3.3 V 4.5 V - Fixed - - 1 16 USLIC - -
Nouveau
N° de stock RS 216-7823
Référence fabricantMAXM17632AME+T
4,265 €
Each (In a Pack of 2)
Unité
1A 12 V Buck Converter 0.9 V 4.5 V - Adjustable - - 1 16 USLIC - -
N° de stock RS 204-4482
Référence fabricantMAX16926GTP/V+
2,74 €
Each (In a Pack of 5)
Unité
2.1A 440 V Buck Converter 3.36 V 36 V - Selectable - - 4 20 TQFN-EP - -
N° de stock RS 204-4317
Référence fabricantMAX20031BATMA/V+
6,96 €
Each
Unité
400mA 10 V Buck Controller 1.5 V 3.5 V - Adjustable - - 2 48 QFND, TQFN - -
Nouveau
N° de stock RS 216-7791
Référence fabricantMAX18166EWE+T
1,593 €
Each (On a Reel of 2500)
Unité
4A 3.3 V Buck Converter 0.6 V 4.5 V - Adjustable - - 1 16 WLP - -
N° de stock RS 204-2480
Référence fabricantMAXM17633AMG+
4,85 €
Each (In a Pack of 2)
Unité
2 12 Buck Converter 0.9 4.5 - Adjustable - - 1 24 USLIC - -
N° de stock RS 204-2529
Référence fabricantMAXM15068AMB+
3,709 €
Each (On a Tape of 10)
Unité
200mA 12 V Buck Converter 5 V 7.5 V - Adjustable - - 1 10 USLIC - -
Nouveau
N° de stock RS 216-7827
Référence fabricantMAXM17634AMG+T
3,435 €
Each (On a Reel of 2500)
Unité
1A 5 V Buck Converter 0.9 V 4.5 V - Fixed - - 1 24 USLIC - -
Nouveau
N° de stock RS 216-7826
Référence fabricantMAXM17633AMG+T
5,09 €
Each (In a Pack of 2)
Unité
1A 3.3 V Buck Converter 0.9 V 4.5 V - Fixed - - 1 24 USLIC - -
N° de stock RS 204-2495
Référence fabricantMAX18166EWE+
2,458 €
Each (In a Pack of 5)
Unité
4.5A 3.3 V Buck Converter 0.6 V 4.5 V - Adjustable - - 1 16 WLP - -
Nouveau
N° de stock RS 214-9154
Référence fabricantMAX20006EAFOB/VY+
1,849 €
Each (In a Tray of 420)
Unité
6A 5 V Synchronous Buck Converter 36 V 3 V - Fixed - - 1 17 FC2QFN - -
N° de stock RS 204-4313
Référence fabricantMAX20030BATMA/V+
6,146 €
Each (In a Tube of 43)
Unité
400mA 10 V Buck Controller 1.5 V 3.5 V - Adjustable - - 2 48 QFND, TQFN - -
N° de stock RS 799-7897
Référence fabricantMAX638ACSA+
4,26 €
Each
Unité
1mA 5.25 V Step Down 4.75 V 2.2 V, 5 V 16.5 V Adjustable Surface Mount - 1 8 SOIC Yes 0.2 %/V
N° de stock RS 168-2890
Référence fabricantMAX17572ATC+
1,466 €
Each (In a Tray of 490)
Unité
1A 5.25 V Step Down 4.75 V 4.5 V 60 V Adjustable Surface Mount - 1 12 TDFN Yes -
N° de stock RS 189-6949
Référence fabricantMAX1791EUB+
3,677 €
Each (In a Tube of 50)
Unité
2A 5.5 V Step Down 0.5 V 5 V 20 V Adjustable Surface Mount - 1 10 μMAX Yes -
Nouveau
N° de stock RS 216-7820
Référence fabricantMAXM17631AME+T
2,599 €
Each (On a Reel of 2500)
Unité
1A 5 V Buck Converter 3.3 V 4.5 V - Fixed - - 1 16 USLIC - -