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. 121-9326
FabrikantnummerLMZ10503TZE-ADJ/NOPB
€ 6,119
Each (In a Tube of 45)
Aantal stuks
3A 5 V Buck Controller 0.8 V 2.95 V 5.5 V Adjustable Surface Mount - 1 7 TO-PMOD Yes 0.04 %
RS-stocknr. 798-1117
FabrikantnummerLMZ10503TZE-ADJ/NOPB
€ 7,25
Each
Aantal stuks
3A 5 V Buck Controller 0.8 V 2.95 V 5.5 V Adjustable Surface Mount - 1 7 TO-PMOD Yes 0.04 %
RS-stocknr. 533-3743
FabrikantnummerLM2596T-5.0/NOPB
€ 4,13
Each
Aantal stuks
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 922-8301
FabrikantnummerAP5100WG-7
FabrikantDiodesZetex
€ 0,37
Each (On a Reel of 3000)
Aantal stuks
1.2A 15 V Buck Controller 0.81 V 4.75 V 24 V Adjustable Surface Mount - 1 3 SOT-26 - -
RS-stocknr. 162-5043
FabrikantnummerLM22671MRE-ADJ/NOPB
€ 1,815
Each (On a Reel of 250)
Aantal stuks
500mA - Buck Controller, Inverting 1.258 V 4.5 V 42 V Adjustable Surface Mount - 1 8 PSOP Yes -
RS-stocknr. 851-6783
FabrikantnummerLTC3630IMSE#PBF
FabrikantAnalog Devices
€ 7,38
Each
Aantal stuks
500mA 65 V Step Down 0.8 V 4 V 65 V Adjustable Surface Mount - 1 12 MSOP - 0.001 %/V
RS-stocknr. 738-6235
FabrikantnummerMCP1603T-330I/OS
FabrikantMicrochip
€ 0,87
Each (In a Pack of 5)
Aantal stuks
500mA 4.5 V Buck Controller 0.8 V 2.7 V 5.5 V Fixed Surface Mount - 1 5 TSOT Yes 0.3 %/V
RS-stocknr. 889-5651
FabrikantnummerMCP1603T-330I/OS
FabrikantMicrochip
€ 0,626
Each (On a Reel of 3000)
Aantal stuks
500mA 4.5 V Buck Controller 0.8 V 2.7 V 5.5 V Fixed Surface Mount - 1 5 TSOT Yes 0.3 %/V
RS-stocknr. 660-6055
FabrikantnummerLM22671MRE-ADJ/NOPB
€ 2,90
Each
Aantal stuks
500mA - Buck Controller, Inverting 1.258 V 4.5 V 42 V Adjustable Surface Mount - 1 8 PSOP Yes -
RS-stocknr. 920-3602
FabrikantnummerLM2596T-5.0/NOPB
€ 4,314
Each (In a Tube of 45)
Aantal stuks
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 751-3005
FabrikantnummerAP5100WG-7
FabrikantDiodesZetex
€ 0,872
Each (In a Pack of 5)
Aantal stuks
1.2A 15 V Buck Controller 0.81 V 4.75 V 24 V Adjustable Surface Mount - 1 3 SOT-26 - -
RS-stocknr. 858-0661
FabrikantnummerLT8612IUDE#PBF
FabrikantAnalog Devices
€ 11,03
Each
Aantal stuks
6A - Step Down - 3.4 V 42 V Adjustable Surface Mount - 1 28 QFN Yes 0.025 %/V
RS-stocknr. 920-3595
FabrikantnummerLM2596S-ADJ/NOPB
€ 4,20
Each (In a Tube of 45)
Aantal stuks
3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS-stocknr. 533-3715
FabrikantnummerLM2596S-ADJ/NOPB
€ 4,95
Each
Aantal stuks
3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS-stocknr. 168-4371
FabrikantnummerTPS54160DGQR
€ 1,488
Each (On a Reel of 2500)
Aantal stuks
500mA 58 V - 0.8 V 3.5 V 60 V Adjustable Surface Mount - 1 10 MSOP Yes -
RS-stocknr. 398-495
FabrikantnummerTS2596CM5 RNG
€ 2,174
Each (In a Pack of 5)
Aantal stuks
3A 37 V Buck Controller 1.23 V - 40 V Adjustable Surface Mount - 1 6 D2PAK (TO-263) Yes -
RS-stocknr. 709-3282
FabrikantnummerTPS54233D
€ 1,37
Each
Aantal stuks
2A - Buck Controller 0.8 V 3.5 V 28 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 922-8282
FabrikantnummerAP1509-50SG-13
FabrikantDiodesZetex
€ 0,478
Each (On a Reel of 2500)
Aantal stuks
2A 5 V Buck Controller - 4.5 V 22 V Fixed Surface Mount - 1 8 SOP Yes -
RS-stocknr. 533-3529
FabrikantnummerLM2592HVT-ADJ/NOPB
€ 5,25
Each
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. 812-3729
FabrikantnummerTPS62175DQCT
€ 1,141
Each (In a Pack of 10)
Aantal stuks
500mA 6 V - 1 V 4.75 V 28 V Adjustable Surface Mount - 1 10 WSON Yes 0.015 %/V