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.

...
Read more Read less

Filters

Viewing 1 - 18 of 18 products
Results per page
Description Price 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 Stock No. 751-2923
Mfr. Part No.AP1509-50SG-13
kr 12,198
Each (In a Pack of 5)
Units
2A 5 V Buck Controller - 4.5 V 22 V Fixed Surface Mount - 1 8 SOP Yes -
RS Stock No. 922-8282
Mfr. Part No.AP1509-50SG-13
kr 5,199
Each (On a Reel of 2500)
Units
2A 5 V Buck Controller - 4.5 V 22 V Fixed Surface Mount - 1 8 SOP Yes -
RS Stock No. 751-3115
Mfr. Part No.AP8801SG-13
kr 4,836
Each (On a Tape of 5)
Units
500mA 50 V Buck Controller -0.3 V 8 V 48 V Adjustable Surface Mount - 2 8 SOIC - -
RS Stock No. 122-0827
Mfr. Part No.AP8801SG-13
kr 4,743
Each (On a Reel of 2500)
Units
500mA 50 V Buck Controller -0.3 V 8 V 48 V Adjustable Surface Mount - 2 8 SOIC - -
RS Stock No. 133-3338
Mfr. Part No.AL8860WT-7
kr 3,213
Each (In a Pack of 20)
Units
1A - Buck Converter - 4.5 V 40 V Adjustable Surface Mount - - 25 TSOT Yes -
RS Stock No. 922-8311
Mfr. Part No.AP8802HSP-13
kr 10,696
Each (On a Reel of 2500)
Units
1A 50 V Buck Controller -0.3 V 8 V 48 V Adjustable Surface Mount - 2 8 SOIC - -
RS Stock No. 122-0359
Mfr. Part No.AP1509-33SG-13
kr 8,142
Each (On a Reel of 2500)
Units
2A 3.3 V Buck Controller - 4.5 V 22 V Fixed Surface Mount - 1 8 SOP Yes -
RS Stock No. 169-0664
Mfr. Part No.AP8802SG-13
kr 6,622
Each (On a Reel of 2500)
Units
1A 50 V Buck Controller -0.3 V 8 V 48 V Adjustable Surface Mount - 2 8 SOIC - -
RS Stock No. 133-3339
Mfr. Part No.AL8860MP-13
kr 3,544
Each (In a Pack of 25)
Units
1.5A - Buck Converter - 4.5 V 40 V Adjustable Surface Mount - - 8 MSOP-8EP Yes -
RS Stock No. 168-9544
Mfr. Part No.AL8860MP-13
kr 2,972
Each (On a Reel of 2500)
Units
1.5A - Buck Converter - 4.5 V 40 V Adjustable Surface Mount - - 8 MSOP-8EP Yes -
RS Stock No. 751-3118
Mfr. Part No.AP8802HSP-13
kr 22,396
Each (In a Pack of 5)
Units
1A 50 V Buck Controller -0.3 V 8 V 48 V Adjustable Surface Mount - 2 8 SOIC - -
RS Stock No. 751-2929
Mfr. Part No.AP1509-33SG-13
kr 14,72
Each (In a Pack of 5)
Units
2A 3.3 V Buck Controller - 4.5 V 22 V Fixed Surface Mount - 1 8 SOP Yes -
RS Stock No. 751-3121
Mfr. Part No.AP8802SPG-13
kr 14,112
Each (In a Pack of 5)
Units
1A 50 V Buck Controller -0.3 V 8 V 48 V Adjustable Surface Mount - 2 8 SOIC - -
RS Stock No. 751-3112
Mfr. Part No.AP8802SG-13
kr 13,764
Each (In a Pack of 5)
Units
1A 50 V Buck Controller -0.3 V 8 V 48 V Adjustable Surface Mount - 2 8 SOIC - -
RS Stock No. 122-0828
Mfr. Part No.AP8802SPG-13
kr 6,827
Each (On a Reel of 2500)
Units
1A 50 V Buck Controller -0.3 V 8 V 48 V Adjustable Surface Mount - 2 8 SOIC - -
RS Stock No. 922-8301
Mfr. Part No.AP5100WG-7
kr 4,025
Each (On a Reel of 3000)
Units
1.2A 15 V Buck Controller 0.81 V 4.75 V 24 V Adjustable Surface Mount - 1 3 SOT-26 - -
RS Stock No. 751-3005
Mfr. Part No.AP5100WG-7
kr 9,48
Each (In a Pack of 5)
Units
1.2A 15 V Buck Controller 0.81 V 4.75 V 24 V Adjustable Surface Mount - 1 3 SOT-26 - -
RS Stock No. 168-9543
Mfr. Part No.AL8860WT-7
kr 2,761
Each (On a Reel of 3000)
Units
1A - Buck Converter - 4.5 V 40 V Adjustable Surface Mount - - 25 TSOT Yes -