Buck Converters

A Buck Converter, also known as a Step-Down Converter, is a DC-to-DC power converter that 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. 184-5385
FabrikantnummerBA9741F-E2
FabrikantROHM
€ 2,04
Each (In a Pack of 5)
Aantal stuks
100mA 35 V - - 3.6 V 35 V Adjustable Surface Mount - 2 16 SOP Yes -
RS-stocknr. 171-7012
FabrikantnummerBD9104FVM-TR
FabrikantROHM
€ 2,466
Each (In a Pack of 5)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 171-5587
FabrikantnummerBD9859EFJ-E2
FabrikantROHM
€ 1,09
Each (In a Pack of 5)
Aantal stuks
3A - Buck Converter 1 V 5 V 14 V Adjustable Surface Mount - 1 8 HTSOP Yes -
RS-stocknr. 184-5358
FabrikantnummerBD9E100FJ-LBGH2
FabrikantROHM
€ 2,772
Each (In a Pack of 5)
Aantal stuks
1A 25.2 V Synchronous Buck Converter 1 V 7 V 36 V Adjustable Surface Mount - 1 8 SOP Yes -
RS-stocknr. 184-5399
FabrikantnummerBD9227F-E2
FabrikantROHM
€ 1,024
Each (In a Pack of 10)
Aantal stuks
1A 20 V Buck Converter 1.51 V 6 V 20 V Adjustable Surface Mount - 1 8 SOP Yes -
RS-stocknr. 171-7014
FabrikantnummerBD9611MUV-E2
FabrikantROHM
€ 1,93
Each (In a Pack of 2)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 167-7461
FabrikantnummerBD9778F-E2
FabrikantROHM
€ 4,10
Each (In a Pack of 5)
Aantal stuks
2A 35 V - 1 V 7 V 35 V Adjustable Surface Mount - - 8 SOP Yes -
RS-stocknr. 184-5389
FabrikantnummerBD9060HFP-CTR
FabrikantROHM
€ 2,71
Each (In a Pack of 2)
Aantal stuks
2A 35 V - 0.8 V 5 V 35 V Adjustable Surface Mount - 1 7 + Tab HRP Yes -
RS-stocknr. 184-5274
FabrikantnummerBD9E303EFJ-LBH2
FabrikantROHM
€ 3,775
Each (In a Pack of 2)
Aantal stuks
3A 28.8 V Synchronous Buck Converter 1 V 7 V 36 V Adjustable Surface Mount - 1 8 HTSOP Yes -
RS-stocknr. 184-5392
FabrikantnummerBD90610EFJ-CE2
FabrikantROHM
€ 1,80
Each (In a Pack of 2)
Aantal stuks
1.25A 36 V - 0.8 V 3.5 V 36 V Adjustable Surface Mount - 1 8 HTSOP Yes -
RS-stocknr. 184-5297
FabrikantnummerBD99010EFV-ME2
FabrikantROHM
€ 4,464
Each (In a Pack of 5)
Aantal stuks
2A 3.3 V - - 3.6 V 35 V Fixed Surface Mount - 1 24 HTSSOP Yes -
RS-stocknr. 184-5280
FabrikantnummerBD95841MUV-E2
FabrikantROHM
€ 0,657
Each (In a Pack of 10)
Aantal stuks
4A 5.5 V Synchronous Buck Converter 0.8 V 7.5 V 15 V Adjustable Surface Mount - 1 16 VQFN Yes -
RS-stocknr. 184-5256
FabrikantnummerBD9G102G-LBTR
FabrikantROHM
€ 1,38
Each (In a Pack of 5)
Aantal stuks
500mA 33.6 V Buck Converter 0.75 V 6 V 42 V Adjustable Surface Mount - 1 6 SSOP Yes -
RS-stocknr. 167-7216
FabrikantnummerBD9109FVM-TR
FabrikantROHM
€ 1,892
Each (In a Pack of 5)
Aantal stuks
800mA 3.3 V Buck Converter - 4.5 V 5.5 V Fixed Surface Mount - 1 8 MSOP Yes -
RS-stocknr. 171-5466
FabrikantnummerBD95831MUV-E2
FabrikantROHM
€ 0,563
Each (In a Pack of 10)
Aantal stuks
3A 5.5 V Synchronous Buck Converter 0.8 V 7.5 V 15 V Adjustable Surface Mount - 1 16 VQFN Yes -
RS-stocknr. 184-5319
FabrikantnummerBD9A400MUV-E2
FabrikantROHM
€ 0,709
Each (In a Pack of 10)
Aantal stuks
4A 3.85 V Synchronous Buck Converter 0.8 V 2.7 V 5.5 V Adjustable Surface Mount - 1 16 VQFN Yes -
RS-stocknr. 171-5639
FabrikantnummerBD9701T
FabrikantROHM
€ 3,184
Each (In a Pack of 5)
Aantal stuks
1.5A 32 V Buck Converter 1 V 8 V 35 V Adjustable Through Hole - 1 5 + Tab TO- 220FP Yes 100 mV
RS-stocknr. 184-5260
FabrikantnummerBD9E104FJ-E2
FabrikantROHM
€ 0,767
Each (In a Pack of 10)
Aantal stuks
1A 13 V Synchronous Buck Converter 1 V 7 V 26 V Adjustable Surface Mount - 1 8 SOP Yes -
RS-stocknr. 171-5606
FabrikantnummerBD9V101MUF-LBE2
FabrikantROHM
€ 5,71
Each (In a Pack of 2)
Aantal stuks
1A 5.5 V Synchronous Buck Converter 0.8 V 16 V 60 V Adjustable Surface Mount - 1 24 VQFN Yes -
RS-stocknr. 167-7294
FabrikantnummerBD9329AEFJ-E2
FabrikantROHM
€ 0,718
Each (In a Pack of 25)
Aantal stuks
3A 12.6 V Buck Converter 0.9 V 4.2 V 18 V Adjustable Surface Mount - - 8 HTSOP Yes -