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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รายละเอียดสินค้า / Description ราคา / 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. 533-5058
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-ADJ/NOPB
THB211.89
Each
Units
1A 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 920-3674
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-ADJ/NOPB
THB114.237
Each (In a Tube of 95)
Units
1A 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 920-3665
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-5.0/NOPB
THB139.332
Each (In a Tube of 95)
Units
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS Stock No. 533-5042
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-5.0/NOPB
THB152.39
Each
Units
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS Stock No. 121-8927
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PTN78000WAH
THB477.355
Each (In a Tube of 56)
Units
1.5A - Buck Controller - - - - Through Hole - 1 5 DIP Module Yes ±10
RS Stock No. 545-7811
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.PTN78000WAH
THB496.84
Each
Units
1.5A - Buck Controller - - - - Through Hole - 1 5 DIP Module Yes ±10
RS Stock No. 100-3981
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576T-5.0/NOPB
THB70.52
Each (In a Tube of 45)
Units
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS Stock No. 533-8091
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576T-5.0/NOPB
THB91.93
Each
Units
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS Stock No. 920-3514
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576S-ADJ/NOPB
THB84.56
Each (In a Tube of 45)
Units
3A 37 V Buck Controller, Inverting 1.23 V 4 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS Stock No. 533-3232
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576S-ADJ/NOPB
THB102.79
Each
Units
3A 37 V Buck Controller, Inverting 1.23 V 4 V 40 V Adjustable Surface Mount - 1 6 D2PAK (TO-263) Yes -
RS Stock No. 698-9081
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TPS54160DGQ
THB113.25
Each
Units
1.5A - Buck Controller - 3.5 V 60 V Adjustable Surface Mount - 1 10 MSOP Yes -
RS Stock No. 533-3181
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576HVT-ADJ/NOPB
THB232.17
Each
Units
3A 57 V Buck Controller, Inverting 1.23 V 4 V 60 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS Stock No. 533-4960
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2674M-ADJ/NOPB
THB114.14
Each
Units
500mA 37 V Buck Controller 1.21 V 8 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 920-3668
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2675M-12/NOPB
THB140.02
Each (In a Tube of 95)
Units
1A - Buck Controller - 8 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS Stock No. 920-3567
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2594M-5.0/NOPB
THB96.81
Each (In a Tube of 95)
Units
500mA - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 8 SOIC Yes -
RS Stock No. 533-3743
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2596T-5.0/NOPB
THB158.43
Each
Units
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS Stock No. 923-6671
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TPS54160DGQ
THB103.87
Each (In a Tube of 80)
Units
1.5A - Buck Controller - 3.5 V 60 V Adjustable Surface Mount - 1 10 MSOP Yes -
RS Stock No. 460-972
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2575HVS-5.0/NOPB
THB167.53
Each
Units
1A - Buck Controller, Inverting - 4 V 60 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS Stock No. 920-3602
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2596T-5.0/NOPB
THB124.052
Each (In a Tube of 45)
Units
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS Stock No. 920-3508
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576HVT-ADJ/NOPB
THB179.14
Each (In a Tube of 45)
Units
3A 57 V Buck Controller, Inverting 1.23 V 4 V 60 V Adjustable Through Hole - 1 5 TO-220 Yes -