Buck Converters

A Buck Converter, also known as a Step-Down Converter, is a DC-to-DC power converter which 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. 145-3921
FabrikantnummerLM2575TV-ADJG
FabrikantON Semiconductor
€ 1,522
Each (In a Tube of 50)
Aantal stuks
1A 37 V Buck Controller 1.23 V 4.75 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 121-6366
FabrikantnummerLM2594DADJR2G
FabrikantON Semiconductor
€ 0,65
Each (On a Reel of 2500)
Aantal stuks
500mA 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 923-6671
FabrikantnummerTPS54160DGQ
€ 2,588
Each (In a Tube of 80)
Aantal stuks
1.5A - Buck Controller - 3.5 V 60 V Adjustable Surface Mount - 1 10 MSOP Yes -
RS-stocknr. 169-8938
FabrikantnummerTS2596CM5 RNG
€ 1,002
Each (On a Reel of 800)
Aantal stuks
3A 37 V Buck Controller 1.23 V - 40 V Adjustable Surface Mount - 1 6 D2PAK (TO-263) Yes -
RS-stocknr. 786-2385
FabrikantnummerLM2594DADJR2G
FabrikantON Semiconductor
€ 1,243
Each (In a Pack of 10)
Aantal stuks
500mA 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 102-3575
FabrikantnummerL5972D
€ 1,302
Each (In a Tube of 100)
Aantal stuks
1.5A 35 V Buck Controller 1.235 V 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 809-5340
FabrikantnummerTL2575-12IKTTR
€ 1,609
Each (In a Pack of 20)
Aantal stuks
1A 12.6 V Step Down 11.4 V 4.75 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes ±4 %, ±5 %
RS-stocknr. 506-0710
FabrikantnummerLT3430EFE#PBF
FabrikantAnalog Devices
€ 10,29
Each
Aantal stuks
6.5A - Buck Controller - 5.5 V 60 V Adjustable Surface Mount - 1 16 TSSOP Yes 0.15 %/V
RS-stocknr. 533-3759
FabrikantnummerLM2596T-ADJ/NOPB
€ 4,13
Each
Aantal stuks
3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 121-8927
FabrikantnummerPTN78000WAH
€ 11,231
Each (In a Tube of 56)
Aantal stuks
1.5A - Buck Controller - - - - Through Hole - 1 5 DIP Module Yes ±10
RS-stocknr. 169-8942
FabrikantnummerTS2596CM550 RNG
€ 0,59
Each (On a Reel of 800)
Aantal stuks
3A - Buck Controller - - 40 V Fixed Surface Mount - 1 6 D2PAK (TO-263) Yes -
RS-stocknr. 798-1240
FabrikantnummerLMZ23603TZ/NOPB
€ 12,60
Each
Aantal stuks
3A 6 V Buck Controller 0.8 V 6 V 36 V Adjustable Surface Mount - 1 7 TO-PMOD Yes ±0.02 %
RS-stocknr. 922-2252
FabrikantnummerLMZ14203TZ-ADJ/NOPB
€ 11,121
Each (On a Reel of 250)
Aantal stuks
3A 6 V Buck Controller 0.8 V 6 V 42 V Adjustable Surface Mount - 1 7 TO-PMOD Yes 0.01 %
RS-stocknr. 680-7236
FabrikantnummerA4403GEUTR-T
€ 1,398
Each (In a Pack of 5)
Aantal stuks
3A - Buck Controller - 9 V 46 V - Surface Mount - 1 16 QFN Yes -
RS-stocknr. 923-2528
FabrikantnummerLM2575HVS-ADJ/NOPB
€ 4,451
Each (In a Tube of 45)
Aantal stuks
1A 57 V Buck Controller, Inverting 1.23 V 4 V 60 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS-stocknr. 825-6923
FabrikantnummerTPS62150RGTT
€ 1,63
Each (In a Pack of 5)
Aantal stuks
1A 6 V Buck 0.9 V 3 V 17 V Adjustable Surface Mount - 1 16 QFN - 0.02 %/V
RS-stocknr. 660-6067
FabrikantnummerLM22672MRE-ADJ/NOPB
€ 3,72
Each
Aantal stuks
1A - Buck Controller, Inverting 1.258 V 4.5 V 42 V Adjustable Surface Mount - 1 8 PSOP Yes -
RS-stocknr. 133-3339
FabrikantnummerAL8860MP-13
FabrikantDiodesZetex
€ 0,326
Each (In a Pack of 25)
Aantal stuks
1.5A - Buck Converter - 4.5 V 40 V Adjustable Surface Mount - - 8 MSOP-8EP Yes -
RS-stocknr. 786-9749
FabrikantnummerLT8610EMSE#PBF
FabrikantAnalog Devices
€ 7,38
Each
Aantal stuks
2.5A 12 V Synchronous Buck Controller 0.97 V 3.4 V 42 V Adjustable Surface Mount - 1 16 MSOP Yes 0.02 %/V
RS-stocknr. 533-5058
FabrikantnummerLM2675M-ADJ/NOPB
€ 4,41
Each
Aantal stuks
1A 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -