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. 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. 121-7276
FabrikantnummerISL85410FRZ-T7A
FabrikantIntersil
€ 2,405
Each (In a Pack of 2)
Aantal stuks
1A 34 V Synchronous Buck Controller 0.6 V 3 V 40 V Adjustable Surface Mount - 1 12 DFN Yes -
RS-stocknr. 518-277
FabrikantnummerEL7554IREZ
FabrikantIntersil
€ 3,00
Each
Aantal stuks
4A - Buck Controller 0.8 V 3 V 6 V Adjustable Surface Mount - 1 28 HTSSOP Yes 0.5 %
RS-stocknr. 135-7890
FabrikantnummerISL85012FRZ-T7A
FabrikantIntersil
€ 3,592
Each (On a Reel of 250)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 169-8339
FabrikantnummerEL7532IYZ
FabrikantIntersil
€ 3,998
Each (In a Tube of 50)
Aantal stuks
2A - Buck Controller 0.8 V 2.5 V 5.5 V Adjustable Surface Mount - 1 10 MSOP Yes 0.1 %/V
RS-stocknr. 170-8168
FabrikantnummerISL8088IRZ-T7A
FabrikantIntersil
€ 1,318
Each (On a Reel of 250)
Aantal stuks
800mA 5.5 V Synchronous Buck Regulator 0.59 V 2.75 V 5.5 V Adjustable Surface Mount - 2 10 DFN Yes 0.2 %/V
RS-stocknr. 150-1742
FabrikantnummerISL85005AFRZ-T7A
FabrikantIntersil
€ 1,88
Each (In a Pack of 2)
Aantal stuks
5A 5.5 V Synchronous Buck Regulator 4.3 V 4.5 V 18 V Adjustable Surface Mount - 1 12 DFN Yes -
RS-stocknr. 150-1744
FabrikantnummerISL85009FRZ-T7A
FabrikantIntersil
€ 3,32
Each
Aantal stuks
9A 5.5 V Synchronous Buck Regulator 4.3 V 3.8 V 18 V Adjustable Surface Mount - 1 15 TQFN Yes -
RS-stocknr. 150-1583
FabrikantnummerISL85012FRZ-T7A
FabrikantIntersil
€ 3,363
Each (On a Reel of 250)
Aantal stuks
12A 5.5 V Synchronous Buck Regulator 4.3 V 3.8 V 18 V Adjustable Surface Mount - 1 15 TQFN Yes -
RS-stocknr. 170-8169
FabrikantnummerISL8033IRZ-T7A
FabrikantIntersil
€ 1,123
Each (On a Reel of 250)
Aantal stuks
3A 6 V Synchronous Buck Regulator 0.79 V 2.85 V 6 V Adjustable Surface Mount - 2 24 QFN Yes 0.1 %/V
RS-stocknr. 134-8559
FabrikantnummerISL85005AFRZ-T7A
FabrikantIntersil
€ 0,83
Each (In a Pack of 2)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 135-7891
FabrikantnummerISL85014FRZ-T7A
FabrikantIntersil
€ 3,698
Each (On a Reel of 250)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 135-7888
FabrikantnummerISL85003AFRZ-T7A
FabrikantIntersil
€ 1,122
Each (On a Reel of 250)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 171-2036
FabrikantnummerZL9024MAIRZ
FabrikantIntersil
€ 45,107
Each (In a Tray of 6)
Aantal stuks
33A 1.5 V Step Down 0.6 V 2.75 V 4 V Adjustable Surface Mount - 1 17 HDA Yes -
RS-stocknr. 169-8292
FabrikantnummerEL7554IREZ
FabrikantIntersil
€ 2,921
Each (In a Tube of 50)
Aantal stuks
4A - Buck Controller 0.8 V 3 V 6 V Adjustable Surface Mount - 1 28 HTSSOP Yes 0.5 %
RS-stocknr. 135-7887
FabrikantnummerISL85003FRZ-T7A
FabrikantIntersil
€ 1,105
Each (On a Reel of 250)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 135-8010
FabrikantnummerISL85012FRZ-T7A
FabrikantIntersil
€ 4,50
Each
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 150-1746
FabrikantnummerISL85012FRZ-T7A
FabrikantIntersil
€ 5,93
Each
Aantal stuks
12A 5.5 V Synchronous Buck Regulator 4.3 V 3.8 V 18 V Adjustable Surface Mount - 1 15 TQFN Yes -
RS-stocknr. 134-8420
FabrikantnummerISL85005AFRZ-T7A
FabrikantIntersil
€ 0,807
Each (On a Reel of 250)
Aantal stuks
- - - - - - - - - - - - - -