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 900-9851
Référence fabricantTPS563209DDCT
0,872 €
Each (In a Pack of 5)
Unité
3A 7 V Synchronous Step Down 0.76 V 4.5 V 17 V Adjustable Surface Mount - 1 6 SOT-23 Yes -
N° de stock RS 533-5121
Référence fabricantLM2676S-ADJ/NOPB
5,10 €
Each
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 100-3942
Référence fabricantLM2676S-ADJ/NOPB
4,20 €
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 506-0580
Référence fabricantLT1934ES6#TRMPBF
4,87 €
Each
Unité
300mA - Buck Controller - 3.2 V 34 V Fixed Surface Mount - 1 6 TSOT-23 Yes 0.007 %/V
N° de stock RS 168-5905
Référence fabricantL4960
2,683 €
Each (In a Tube of 50)
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 812-3729
Référence fabricantTPS62175DQCT
1,141 €
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 398-528
Référence fabricantTS2596CM550 RNG
0,612 €
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 121-9753
Référence fabricantTPS62740DSST
0,764 €
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 920-3536
Référence fabricantLM2591HVS-5.0/NOPB
4,653 €
Each (In a Tube of 45)
Unité
1A - Buck Controller - 4.5 V 60 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
N° de stock RS 145-8601
Référence fabricantL5970D
1,279 €
Each (In a Tube of 100)
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
0,438 €
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 920-3567
Référence fabricantLM2594M-5.0/NOPB
3,385 €
Each (In a Tube of 95)
Unité
500mA - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
N° de stock RS 811-5652
Référence fabricantLM5017MR/NOPB
3,136 €
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 533-3557
Référence fabricantLM2594M-5.0/NOPB
3,98 €
Each
Unité
500mA - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
N° de stock RS 733-6413
Référence fabricantXRP6658ISTR-F
MarqueMaxLinear
1,278 €
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 920-3630
Référence fabricantLM2672M-3.3/NOPB
3,849 €
Each (In a Tube of 95)
Unité
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
N° de stock RS 379-921
Référence fabricantL5970D
2,152 €
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 533-3456
Référence fabricantLM2591HVS-5.0/NOPB
5,51 €
Each
Unité
1A - Buck Controller - 4.5 V 60 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
N° de stock RS 169-8942
Référence fabricantTS2596CM550 RNG
0,605 €
Each (On a Reel of 800)
Unité
3A - Buck Controller - - 40 V Fixed Surface Mount - 1 6 D2PAK (TO-263) Yes -
N° de stock RS 825-7018
Référence fabricantTPS62740DSST
1,33 €
Each (In a Pack of 2)
Unité
300mA 3.3 V Buck 1.8 V 2.2 V 5.5 V Adjustable Surface Mount - 1 12 WSON - 0 %/V