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. 920-3586
FabrikantnummerLM2596S-5.0/NOPB
€ 4,20
Each (In a Tube of 45)
Aantal stuks
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS-stocknr. 170-9356
FabrikantnummerMP2459GJ-P
€ 0,821
Each (On a Reel of 500)
Aantal stuks
500mA - Step Down 0.81 V 4.5 V 55 V Adjustable Surface Mount - 1 6 TSOT-23 Yes -
RS-stocknr. 920-3508
FabrikantnummerLM2576HVT-ADJ/NOPB
€ 5,197
Each (In a Tube of 45)
Aantal stuks
3A 57 V Buck Controller, Inverting 1.23 V 4 V 60 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 162-6743
FabrikantnummerTL2575-05IKTTR
€ 1,098
Each (On a Reel of 500)
Aantal stuks
1A 5.25 V Step Down 4.75 V 4.75 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes ±4 %, ±5 %
RS-stocknr. 917-5793
FabrikantnummerMP2459GJ-P
€ 1,428
Each (In a Pack of 5)
Aantal stuks
500mA - Step Down 0.81 V 4.5 V 55 V Adjustable Surface Mount - 1 6 TSOT-23 Yes -
RS-stocknr. 168-4999
FabrikantnummerLM5165XDRCT
€ 2,806
Each (On a Reel of 250)
Aantal stuks
150mA 5 V Step Down - 3 V 65 V Fixed Surface Mount - 1 10 VSON Yes -
RS-stocknr. 884-2638
FabrikantnummerLTC3630EMSE#PBF
FabrikantAnalog Devices
€ 7,00
Each (In a Pack of 2)
Aantal stuks
500mA 65 V Step Down 0.8 V 4 V 65 V - Surface Mount - 1 16 MSOP Yes 0.001 %/V
RS-stocknr. 460-972
FabrikantnummerLM2575HVS-5.0/NOPB
€ 4,75
Each
Aantal stuks
1A - Buck Controller, Inverting - 4 V 60 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS-stocknr. 779-9640
FabrikantnummerLT3502AEMS#PBF
FabrikantAnalog Devices
€ 4,25
Each (In a Pack of 2)
Aantal stuks
500mA 3.3 V, 7 V Buck Controller 0.8 V 3 V 40 V - Surface Mount - 1 10 MSOP Yes 0.005 %/V
RS-stocknr. 809-5343
FabrikantnummerTL2575-05IKTTR
€ 1,608
Each (In a Pack of 10)
Aantal stuks
1A 5.25 V Step Down 4.75 V 4.75 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes ±4 %, ±5 %
RS-stocknr. 133-0669
FabrikantnummerLM5165XDRCT
€ 1,715
Each (In a Pack of 2)
Aantal stuks
150mA 5 V Step Down - 3 V 65 V Fixed Surface Mount - 1 10 VSON Yes -
RS-stocknr. 792-5688
FabrikantnummerST1S31D-R
€ 1,13
Each (On a Tape of 5)
Aantal stuks
3A - Buck Controller 0.8 V 2.8 V 5.5 V Adjustable Surface Mount - 1 8 SOIC Yes 0.3 %
RS-stocknr. 168-7077
FabrikantnummerST1S31D-R
€ 0,511
Each (On a Reel of 2500)
Aantal stuks
3A - Buck Controller 0.8 V 2.8 V 5.5 V Adjustable Surface Mount - 1 8 SOIC Yes 0.3 %
RS-stocknr. 506-0574
FabrikantnummerLT1933ES6#TRMPBF
FabrikantAnalog Devices
€ 4,16
Each
Aantal stuks
600mA 5 V Buck Controller 1.25 V 3.6 V 36 V Adjustable Surface Mount - 1 6 TSOT-23 Yes 0.01 %/V
RS-stocknr. 533-3181
FabrikantnummerLM2576HVT-ADJ/NOPB
€ 6,04
Each
Aantal stuks
3A 57 V Buck Controller, Inverting 1.23 V 4 V 60 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS-stocknr. 100-0726
FabrikantnummerLM2575HVS-5.0/NOPB
€ 3,938
Each (In a Tube of 45)
Aantal stuks
1A - Buck Controller, Inverting - 4 V 60 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS-stocknr. 545-5023
FabrikantnummerLT1074CT#PBF
FabrikantAnalog Devices
€ 10,51
Each
Aantal stuks
10A 50 V Buck Controller 2.5 V 7.3 V 45 V Adjustable Through Hole - 1 5 TO-220 Yes 0.02 %/V
RS-stocknr. 460-459
FabrikantnummerLM2575HVS-ADJ/NOPB
€ 4,95
Each
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. 825-6835
FabrikantnummerTPS5430DDAR
€ 3,33
Each (In a Pack of 2)
Aantal stuks
3A 31 V Buck 1.22 V 5.5 V 36 V Adjustable Surface Mount - 1 8 SOIC - -
RS-stocknr. 921-3044
FabrikantnummerTPS5430DDAR
€ 1,819
Each (On a Reel of 2500)
Aantal stuks
3A 31 V Buck 1.22 V 5.5 V 36 V Adjustable Surface Mount - 1 8 SOIC - -