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. 858-0841
FabrikantnummerLT1933IS6#TRMPBF
FabrikantAnalog Devices
€ 4,775
Each (In a Pack of 2)
Aantal stuks
600mA - Step Down - 3.6 V 36 V Adjustable Surface Mount - 1 6 TSOT-23 Yes 0.01 %/V
RS-stocknr. 698-9081
FabrikantnummerTPS54160DGQ
€ 3,05
Each
Aantal stuks
1.5A - Buck Controller - 3.5 V 60 V Adjustable Surface Mount - 1 10 MSOP Yes -
RS-stocknr. 786-2353
FabrikantnummerLM2575TV-ADJG
FabrikantON Semiconductor
€ 1,795
Each (In a Pack of 2)
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. 825-6810
FabrikantnummerTPS54160DGQR
€ 2,728
Each (In a Pack of 5)
Aantal stuks
500mA 58 V - 0.8 V 3.5 V 60 V Adjustable Surface Mount - 1 10 MSOP Yes -
RS-stocknr. 155-9379
FabrikantnummerLT1933IS6#TRMPBF
FabrikantAnalog Devices
€ 2,995
Each (On a Reel of 500)
Aantal stuks
600mA - Step Down - 3.6 V 36 V Adjustable Surface Mount - 1 6 TSOT-23 Yes 0.01 %/V
RS-stocknr. 121-6365
FabrikantnummerLM2576TV-5G
FabrikantON Semiconductor
€ 1,435
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. 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. 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. 162-7571
FabrikantnummerTPS54233D
€ 1,163
Each (In a Tube of 75)
Aantal stuks
2A - Buck Controller 0.8 V 3.5 V 28 V Adjustable Surface Mount - 1 8 SOIC Yes -
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. 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. 920-3605
FabrikantnummerLM2596T-ADJ/NOPB
€ 3,498
Each (In a Tube of 45)
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. 170-8149
FabrikantnummerISL85412FRTZ-T7A
FabrikantIntersil
€ 1,411
Each (On a Reel of 250)
Aantal stuks
150mA 34 V Synchronous Buck Controller 0.6 V 3.5 V 40 V Adjustable Surface Mount - 1 8 TDFN Yes -
RS-stocknr. 121-7277
FabrikantnummerISL85412FRTZ-T7A
FabrikantIntersil
€ 2,076
Each (On a Tape of 5)
Aantal stuks
150mA 34 V Synchronous Buck Controller 0.6 V 3.5 V 40 V Adjustable Surface Mount - 1 8 TDFN 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. 145-6613
FabrikantnummerTL2575-12IKTTR
€ 1,098
Each (On a Reel of 500)
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. 545-7811
FabrikantnummerPTN78000WAH
€ 11,87
Each
Aantal stuks
1.5A - Buck Controller - - - - Through Hole - 1 5 DIP Module Yes ±10
RS-stocknr. 534-3431
FabrikantnummerLM5007MM/NOPB
€ 2,62
Each
Aantal stuks
500mA 7.4 V Buck Controller 6.6 V 9 V 75 V Adjustable Surface Mount - 1 8 MSOP Yes -
RS-stocknr. 920-3554
FabrikantnummerLM2592HVT-ADJ/NOPB
€ 4,467
Each (In a Tube of 45)
Aantal stuks
2A 57 V Buck Controller, Inverting 1.2 V 4.5 V 60 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 121-9375
FabrikantnummerTPS62175DQCT
€ 0,799
Each (On a Reel of 250)
Aantal stuks
500mA 6 V - 1 V 4.75 V 28 V Adjustable Surface Mount - 1 10 WSON Yes 0.015 %/V