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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Omschrijving Prijs 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
RS-stocknr. 163-0438
FabrikantnummerLM2576D2T-005G
FabrikantON Semiconductor
1,832 €
Each (In a Tube of 50)
Aantal stuks
3A 5.25 V Buck Controller 4.75 V 8 V 40 V Adjustable Surface Mount - 1 5 D2PAK Yes -
RS-stocknr. 801-0263
FabrikantnummerLA5724MC-BH
FabrikantON Semiconductor
1,38 €
Each (In a Pack of 5)
Aantal stuks
300mA 5 V Buck Controller - 4.5 V 28 V Fixed Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 103-5073
FabrikantnummerLM2574N-5G
FabrikantON Semiconductor
1,245 €
Each (In a Tube of 50)
Aantal stuks
500mA 5.25 V Buck Controller, Inverting 4.75 V 4.75 V 40 V Fixed Through Hole - 1 8 PDIP Yes -
RS-stocknr. 808-0067
FabrikantnummerLM2576D2T-005G
FabrikantON Semiconductor
1,819 €
Each (In a Pack of 10)
Aantal stuks
3A 5.25 V Buck Controller 4.75 V 8 V 40 V Adjustable Surface Mount - 1 5 D2PAK Yes -
RS-stocknr. 121-6367
FabrikantnummerLM2596TVADJG
FabrikantON Semiconductor
1,734 €
Each (In a Tube of 50)
Aantal stuks
3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 163-2155
FabrikantnummerLA5724MC-BH
FabrikantON Semiconductor
0,607 €
Each (On a Reel of 2500)
Aantal stuks
300mA 5 V Buck Controller - 4.5 V 28 V Fixed Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 786-2391
FabrikantnummerLM2596TVADJG
FabrikantON Semiconductor
2,04 €
Each (In a Pack of 5)
Aantal stuks
3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 689-9935
FabrikantnummerLM2574N-5G
FabrikantON Semiconductor
1,48 €
Each
Aantal stuks
500mA 5.25 V Buck Controller, Inverting 4.75 V 4.75 V 40 V Fixed Through Hole - 1 8 PDIP Yes -
RS-stocknr. 161-2655
FabrikantnummerNCP1532MUAATXG
FabrikantON Semiconductor
1,165 €
Each (In a Pack of 10)
Aantal stuks
1.6A 3.3 V Step Down 0.9 V 2.7 V 5.5 V Adjustable Surface Mount - 1 10 UDFN Yes 0.05 %
RS-stocknr. 162-8883
FabrikantnummerLM2595DSADJR4G
FabrikantON Semiconductor
1,033 €
Each (On a Reel of 800)
Aantal stuks
1A 37 V Step Down 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK Yes -
RS-stocknr. 101-8273
FabrikantnummerLM2576T-005G
FabrikantON Semiconductor
1,441 €
Each (In a Tube of 50)
Aantal stuks
3A 5.25 V Buck Controller, Inverting 4.75 V 7 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 786-2350
FabrikantnummerLM2575TV-012G
FabrikantON Semiconductor
2,222 €
Each (In a Pack of 5)
Aantal stuks
1A 12 V Buck Controller - 4.75 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 163-2400
FabrikantnummerLM2575T-5G
FabrikantON Semiconductor
1,612 €
Each (In a Tube of 50)
Aantal stuks
1A 5.25 V Buck Controller 4.75 V 4.75 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 791-9683
FabrikantnummerNCP1599MNTWG
FabrikantON Semiconductor
1,356 €
Each (In a Pack of 5)
Aantal stuks
3A 3.3 V Buck Controller 0.8 V 3 V 5.5 V Adjustable Surface Mount - 1 6 DFN Yes 0.03 %/V
RS-stocknr. 801-0266
FabrikantnummerLA5735MC-AH
FabrikantON Semiconductor
0,714 €
Each (In a Pack of 5)
Aantal stuks
300mA - Buck Controller - 4.5 V 32 V - Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 689-9938
FabrikantnummerLM2574N-ADJG
FabrikantON Semiconductor
1,61 €
Each
Aantal stuks
500mA 37 V Buck Controller, Inverting 1.23 V 4.75 V 40 V Adjustable Through Hole - 1 8 PDIP Yes -
RS-stocknr. 786-2397
FabrikantnummerLM2596DSADJR4G
FabrikantON Semiconductor
2,14 €
Each (In a Pack of 5)
Aantal stuks
3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK Yes -
RS-stocknr. 121-6365
FabrikantnummerLM2576TV-5G
FabrikantON Semiconductor
1,612 €
Each (In a Tube of 50)
Aantal stuks
3A 5 V Buck Controller - - 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 805-1328
FabrikantnummerLM2595TADJG
FabrikantON Semiconductor
2,162 €
Each (In a Pack of 5)
Aantal stuks
1A 37 V Step Down 1.23 V 4.5 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 786-2329
FabrikantnummerLM2574DW-ADJR2G
FabrikantON Semiconductor
1,808 €
Each (In a Pack of 5)
Aantal stuks
500mA - Buck Controller - - - Adjustable Surface Mount - 1 16 SOIC Yes -