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
N° de stock RS 100-3947
Référence fabricantLM2678T-5.0/NOPB
4,183 €
Each (In a Tube of 45)
Unité
5A - Buck Controller - 8 V 40 V Fixed Through Hole - 1 7 TO-220 Yes -
N° de stock RS 534-3431
Référence fabricantLM5007MM/NOPB
2,70 €
Each
Unité
500mA 7.4 V Buck Controller 6.6 V 9 V 75 V Adjustable Surface Mount - 1 8 MSOP Yes -
N° de stock RS 866-0802
Référence fabricantA4447SLJTR-T
1,315 €
Each (In a Pack of 4)
Unité
2A 24 V Step Down 0.8 V 8 V 50 V Adjustable Surface Mount - 1 8 SOIC Yes -
N° de stock RS 177-5537
Référence fabricantA4447SLJTR-T
0,57 €
Each (On a Reel of 1000)
Unité
2A 24 V Step Down 0.8 V 8 V 50 V Adjustable Surface Mount - 1 8 SOIC Yes -
N° de stock RS 533-5288
Référence fabricantLM2678T-5.0/NOPB
4,94 €
Each
Unité
5A - Buck Controller - 8 V 40 V Fixed Through Hole - 1 7 TO-220 Yes -
N° de stock RS 533-8091
Référence fabricantLM2576T-5.0/NOPB
2,40 €
Each
Unité
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
N° de stock RS 121-8329
Référence fabricantLM2574HVM-5.0/NOPB
3,207 €
Each (In a Tube of 50)
Unité
500mA - Buck Controller, Inverting - 4 V 60 V Fixed Surface Mount - 1 14 SOIC W Yes -
N° de stock RS 533-8085
Référence fabricantLM2576T-12/NOPB
2,40 €
Each
Unité
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
N° de stock RS 178-1391
Référence fabricantL296P
5,288 €
Each (In a Tube of 25)
Unité
4A 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 50 mV
N° de stock RS 812-3693
Référence fabricantTPS62120DCNT
1,089 €
Each (In a Pack of 10)
Unité
75mA 5.5 V Step Down 1.2 V 2 V 15 V Fixed Surface Mount - 1 8 SOT-23 Yes 0.04 %/V
N° de stock RS 102-5647
Référence fabricantLM5010AMH/NOPB
2,834 €
Each (In a Tube of 94)
Unité
1A 7.4 V Buck Controller 6.6 V 6 V 75 V Adjustable Surface Mount - 1 14 TSSOP Yes -
N° de stock RS 100-3981
Référence fabricantLM2576T-5.0/NOPB
2,038 €
Each (In a Tube of 45)
Unité
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
N° de stock RS 786-9657
Référence fabricantLT3970EMS-3.3#PBF
5,15 €
Each (In a Pack of 2)
Unité
350mA 3.3 V Buck Controller - 4.2 V 40 V Fixed Surface Mount - 1 10 MSOP Yes 0.01 %/V
N° de stock RS 159-7583
Référence fabricantADP2300AUJZ-R7
1,124 €
Each (On a Reel of 3000)
Unité
1.2A - Buck Controller - 3 V 20 V Adjustable Surface Mount - 1 6 TSOT - -
N° de stock RS 661-6960
Référence fabricantTPS62112RSAT
2,26 €
Each
Unité
1.5A - Buck Controller - 3.1 V 17 V Fixed Surface Mount - 1 16 QFN Yes -
N° de stock RS 908-3874
Référence fabricantLM5160ADNTT
4,095 €
Each (In a Pack of 2)
Unité
1.5A 60 V Synchronous Step Down 2 V 4.5 V 65 V Adjustable Surface Mount - 1 12 WSON Yes ±1 %
N° de stock RS 165-4076
Référence fabricantMIC4680-5.0YM-TR
MarqueMicrochip
1,41 €
Each (On a Reel of 2500)
Unité
1.3A 5.25 V Buck Controller 4.75 V 4 V 34 V Fixed Surface Mount - 1 8 SOIC Yes -
N° de stock RS 121-8277
Référence fabricantLM5575MH/NOPB
5,106 €
Each (In a Tube of 92)
Unité
1.5A - Buck Controller, Inverting - 6 V 75 V Adjustable Surface Mount - 1 16 TSSOP Yes -
N° de stock RS 121-8687
Référence fabricantLM2676T-ADJ/NOPB
3,498 €
Each (In a Tube of 45)
Unité
3A 37 V Buck Controller 1.2 V 8 V 40 V Adjustable Through Hole - 1 7 TO-220 Yes -
N° de stock RS 917-5793
Référence fabricantMP2459GJ-P
1,428 €
Each (In a Pack of 5)
Unité
500mA - Step Down 0.81 V 4.5 V 55 V Adjustable Surface Mount - 1 6 TSOT-23 Yes -