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 812-3729
Référence fabricantTPS62175DQCT
1,255 €
Each (In a Pack of 10)
Unité
500mA 6 V - 1 V 4.75 V 28 V Adjustable Surface Mount - 1 10 WSON Yes 0.015 %/V
N° de stock RS 100-3975
Référence fabricantLM2574N-5.0/NOPB
2,304 €
Each (In a Tube of 40)
Unité
500mA - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 8 MDIP Yes -
N° de stock RS 127-0676
Référence fabricantL4960
3,47 €
Each
Unité
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 7 HEPTAWATT V Yes 50 mV
N° de stock RS 100-3942
Référence fabricantLM2676S-ADJ/NOPB
4,62 €
Each (In a Tube of 45)
Unité
3A 37 V Buck Controller 1.2 V 8 V 40 V Adjustable Surface Mount - 1 7 D2PAK (TO-263) Yes -
N° de stock RS 920-3510
Référence fabricantLM2576S-5.0/NOPB
2,69 €
Each (In a Tube of 45)
Unité
3A - Buck Controller, Inverting - 4 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
N° de stock RS 533-3226
Référence fabricantLM2576S-5.0/NOPB
3,17 €
Each
Unité
3A - Buck Controller, Inverting - 4 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
N° de stock RS 786-9922
Référence fabricantLTC3417AEFE#PBF
7,22 €
Each
Unité
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
N° de stock RS 121-9753
Référence fabricantTPS62740DSST
0,841 €
Each (On a Reel of 250)
Unité
300mA 3.3 V Buck 1.8 V 2.2 V 5.5 V Adjustable Surface Mount - 1 12 WSON - 0 %/V
N° de stock RS 379-921
Référence fabricantL5970D
2,366 €
Each (In a Pack of 5)
Unité
1A 35 V Buck Controller 1.2 V 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes 10 mV
N° de stock RS 913-4269
Référence fabricantXRP6658ISTR-F
MarqueMaxLinear
0,482 €
Each (On a Reel of 3000)
Unité
1A 5 V - 0.6 V 2.5 V 5.5 V - Surface Mount - 1 5 SOT-23 - -
N° de stock RS 533-3692
Référence fabricantLM2596S-5.0/NOPB
5,60 €
Each
Unité
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
N° de stock RS 398-528
Référence fabricantTS2596CM550 RNG
0,726 €
Each (In a Pack of 5)
Unité
3A - Buck Controller - - 40 V Fixed Surface Mount - 1 6 D2PAK (TO-263) Yes -
N° de stock RS 121-9339
Référence fabricantLM5017MR/NOPB
2,927 €
Each (In a Tube of 95)
Unité
650mA 90 V Synchronous Buck Controller 1.25 V 7.5 V 100 V Adjustable Surface Mount - 1 8 SOIC Yes -
N° de stock RS 733-6413
Référence fabricantXRP6658ISTR-F
MarqueMaxLinear
1,406 €
Each (On a Tape of 5)
Unité
1A 5 V - 0.6 V 2.5 V 5.5 V - Surface Mount - 1 5 SOT-23 - -
N° de stock RS 920-3586
Référence fabricantLM2596S-5.0/NOPB
4,62 €
Each (In a Tube of 45)
Unité
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
N° de stock RS 533-4055
Référence fabricantLM2672M-3.3/NOPB
4,99 €
Each
Unité
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
N° de stock RS 533-3456
Référence fabricantLM2591HVS-5.0/NOPB
6,06 €
Each
Unité
1A - Buck Controller - 4.5 V 60 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
N° de stock RS 711-2563
Référence fabricantLT3507EUHF#PBF
8,40 €
Each
Unité
2.4A - - - 4 V 36 V Adjustable Surface Mount - 3 38 QFN - 0.01 %/V
N° de stock RS 811-5652
Référence fabricantLM5017MR/NOPB
3,45 €
Each (In a Pack of 5)
Unité
650mA 90 V Synchronous Buck Controller 1.25 V 7.5 V 100 V Adjustable Surface Mount - 1 8 SOIC Yes -
N° de stock RS 169-8942
Référence fabricantTS2596CM550 RNG
0,702 €
Each (On a Reel of 800)
Unité
3A - Buck Controller - - 40 V Fixed Surface Mount - 1 6 D2PAK (TO-263) Yes -