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. 146-5628
FabrikantnummerLNK304GN
€ 0,655
Each (In a Tube of 50)
Aantal stuks
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS-stocknr. 146-5626
FabrikantnummerLNK304PN
€ 0,657
Each (In a Tube of 50)
Aantal stuks
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS-stocknr. 146-5652
FabrikantnummerLNK306PN
€ 0,896
Each (In a Tube of 50)
Aantal stuks
360mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS-stocknr. 100-3942
FabrikantnummerLM2676S-ADJ/NOPB
€ 4,083
Each (In a Tube of 45)
Aantal stuks
3A 37 V Buck Controller 1.2 V 8 V 40 V Adjustable Surface Mount - 1 7 D2PAK (TO-263) Yes -
RS-stocknr. 533-5121
FabrikantnummerLM2676S-ADJ/NOPB
€ 4,95
Each
Aantal stuks
3A 37 V Buck Controller 1.2 V 8 V 40 V Adjustable Surface Mount - 1 7 D2PAK (TO-263) Yes -
RS-stocknr. 146-5659
FabrikantnummerLNK306GN
€ 0,892
Each (In a Tube of 50)
Aantal stuks
360mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS-stocknr. 533-5042
FabrikantnummerLM2675M-5.0/NOPB
€ 5,33
Each
Aantal stuks
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 920-3665
FabrikantnummerLM2675M-5.0/NOPB
€ 3,725
Each (In a Tube of 95)
Aantal stuks
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS-stocknr. 125-3772
FabrikantnummerLTM4625EY#PBF
FabrikantAnalog Devices
€ 13,05
Each
Aantal stuks
5A 5.5 V Step Down 0.6 V 4 V 20 V dc Adjustable Surface Mount - 1 25 BGA Yes 0.15 %/V
RS-stocknr. 914-2986
FabrikantnummerLMR16006XDDCT
€ 2,785
Each (In a Pack of 2)
Aantal stuks
600mA 5 V Step Down 0.747 4 V 60 V Adjustable Surface Mount - 1 6 SOT-23 Yes -
RS-stocknr. 162-9815
FabrikantnummerLMR16006XDDCT
€ 1,744
Each (On a Reel of 250)
Aantal stuks
600mA 5 V Step Down 0.747 4 V 60 V Adjustable Surface Mount - 1 6 SOT-23 Yes -
RS-stocknr. 162-9816
FabrikantnummerLMR16006YDDCT
€ 1,744
Each (On a Reel of 250)
Aantal stuks
600mA 65 V Step Down -0.3 V 4 V 60 V Adjustable Surface Mount - 1 6 SOT-23 Yes -
RS-stocknr. 900-9790
FabrikantnummerLMR16006YDDCT
€ 2,785
Each (In a Pack of 2)
Aantal stuks
600mA 65 V Step Down -0.3 V 4 V 60 V Adjustable Surface Mount - 1 6 SOT-23 Yes -
RS-stocknr. 796-8360
FabrikantnummerTPS54260DGQ
€ 3,63
Each
Aantal stuks
2.5A 58 V Step Down 0.8 V 3.5 V 60 V Adjustable Surface Mount - 1 10 MSOP Yes -
RS-stocknr. 922-2404
FabrikantnummerTPS54260DGQ
€ 3,08
Each (In a Tube of 80)
Aantal stuks
2.5A 58 V Step Down 0.8 V 3.5 V 60 V Adjustable Surface Mount - 1 10 MSOP Yes -
RS-stocknr. 533-3692
FabrikantnummerLM2596S-5.0/NOPB
€ 4,95
Each
Aantal stuks
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS-stocknr. 146-5637
FabrikantnummerLNK305GN
€ 0,803
Each (In a Tube of 50)
Aantal stuks
280mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS-stocknr. 380-034
FabrikantnummerL5973D
€ 2,344
Each (In a Pack of 5)
Aantal stuks
2A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS-stocknr. 102-3574
FabrikantnummerL5973D
€ 1,381
Each (In a Tube of 100)
Aantal stuks
2A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS-stocknr. 884-2543
FabrikantnummerLTM8032EY#PBF
FabrikantAnalog Devices
€ 23,57
Each
Aantal stuks
2A 10 V Step Down 0.8 V 3.6 V 36 V - Surface Mount - 1 71 BGA Yes 0.1 %