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. 841-7526
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16311T-E/MNY
Brand :Microchip
THB39.44
Each: (In a Pack of 10)
Units
1A 24 V Step Down 2 V 4.4 V 30 V Adjustable Surface Mount - 1 8 TDFN Yes 0.15 %/V
RS Stock No. 165-4042
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16301HT-E/CH
Brand :Microchip
THB28.161
Each (On a Reel of 3000)
Units
600mA 15 V Step Down 2 V 4.7 V 36 V Adjustable Surface Mount - 1 6 SOT-23 Yes 0.1 %/V
RS Stock No. 841-7594
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16331T-E/CH
Brand :Microchip
THB38.84
Each: (In a Pack of 5)
Units
1.2A 24 V Step Down 2 V 4.4 V 50 V Adjustable Surface Mount - 1 6 SOT-23 Yes 0.1 %/V
RS Stock No. 177-1609
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576-12WT
Brand :Microchip
THB52.395
Each (In a Tube of 50)
Units
3A 12 V - - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
ใหม่ / New
RS Stock No. 209-7685
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MIC23050-SYML-TR
Brand :Microchip
THB10.505
Each: (In a Pack of 25)
Units
600mA 5.5 V Buck 3.3 V 2.7 V - Fixed - - 1 8 MLF - -
RS Stock No. 177-1883
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2576-12WT
Brand :Microchip
THB63.064
Each: (In a Pack of 5)
Units
3A 12 V - - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS Stock No. 196-2323
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MIC33M650YMP-TR
Brand :Microchip
THB111.263
Each (On a Reel of 1500)
Units
6A 3.3 V - 0.6 V 2.4 V 5.5 V Selectable Surface Mount - 1 53 QFN - 0.06 (Typ.) %
RS Stock No. 200-9825
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16502TAC-E/S8B
Brand :Microchip
THB69.568
Each (On a Reel of 3300)
Units
1A 3.7 V Buck Regulator 1.2 V 2.7 V - Adjustable - - 4 32 VQFN - -
RS Stock No. 200-9828
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16502TAE-E/S8B
Brand :Microchip
THB91.307
Each: (In a Pack of 3)
Units
1A 3.7 V Buck Regulator 1.2 V 2.7 V - Adjustable - - 4 32 VQFN - -
RS Stock No. 887-7410
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16301T-I/CHY
Brand :Microchip
THB26.704
Each (On a Reel of 3000)
Units
600mA 15 V - 2 V 4 V 30 V Adjustable Surface Mount - 1 6 SOT-23 Yes 0.1 %/V
RS Stock No. 910-1433
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MIC4684YM
Brand :Microchip
THB55.19
Each: (In a Pack of 5)
Units
2A - Buck Controller 1.235 V 4 V 30 V Adjustable Surface Mount - 1 8 SOP Yes -
RS Stock No. 165-4077
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MIC3385YHL-TR
Brand :Microchip
THB59.277
Each (On a Reel of 5000)
Units
600mA 1.02 V Buck Controller 0.98 V 2.7 V 5.5 V Adjustable Surface Mount - 1 14 MLF Yes 0.13 %
ใหม่ / New
RS Stock No. 215-5924
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16501TE-E/RMB
Brand :Microchip
THB63.742
Each: (In a Pack of 5)
Units
1A 3.7 V - 1 V 2.7 V - Selectable - - - 24 VQFN - -
RS Stock No. 770-9476
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16301T-I/CHY
Brand :Microchip
THB29.498
Each: (In a Pack of 4)
Units
600mA 15 V - 2 V 4 V 30 V Adjustable Surface Mount - 1 6 SOT-23 Yes 0.1 %/V
ใหม่ / New
RS Stock No. 215-5920
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP16501TD-E/RMB
Brand :Microchip
THB50.28
Each (On a Reel of 4000)
Units
1A 3.7 V - 1 V 2.7 V - Selectable - - - 24 VQFN - -
RS Stock No. 910-1581
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MIC4680YM
Brand :Microchip
THB65.44
Each: (In a Pack of 2)
Units
1.3A - Buck Controller 1.25 V 4 V 34 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 738-6601
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP1603T-120I/OS
Brand :Microchip
THB37.842
Each: (In a Pack of 5)
Units
500mA 1.2 V Buck Controller - 2.7 V 5.5 V Fixed Surface Mount - 1 5 TSOT Yes 0.3 %/V
RS Stock No. 165-4281
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MIC23451-AAAYFL-T5
Brand :Microchip
THB80.233
Each (On a Reel of 500)
Units
2A 3.3 V Buck 1 V 2.7 V 5.5 V Adjustable Surface Mount - 3 26 QFN Yes 0.3 %/V
RS Stock No. 165-3373
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCP1603T-120I/OS
Brand :Microchip
THB25.733
Each (On a Reel of 3000)
Units
500mA 1.2 V Buck Controller - 2.7 V 5.5 V Fixed Surface Mount - 1 5 TSOT Yes 0.3 %/V
RS Stock No. 178-4932
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.LM2575-5.0WT
Brand :Microchip
THB59.294
Each (In a Tube of 50)
Units
1A 5.25 V Step Down 4.75 V 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -