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. 380-034
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L5973D
THB90.688
Each: (In a Pack of 5)
Units
2A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS Stock No. 168-5905
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4960
THB97.262
Each (In a Tube of 50)
Units
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 7 HEPTAWATT V Yes 50 mV
RS Stock No. 102-3574
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L5973D
THB65.41
Each (In a Tube of 100)
Units
2A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS Stock No. 127-0676
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4960
THB125.34
Each
Units
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 7 HEPTAWATT V Yes 50 mV
RS Stock No. 178-1392
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4970A
THB353.588
Each (In a Tube of 25)
Units
10A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 30 mV
RS Stock No. 251-3390
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4970A
THB409.69
Each
Units
10A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 30 mV
RS Stock No. 102-3575
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L5972D
THB57.947
Each (In a Tube of 100)
Units
1.5A 35 V Buck Controller 1.235 V 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 168-6046
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4962/A
THB108.90
Each (In a Tube of 25)
Units
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 16 PDIP Yes 50 mV
RS Stock No. 168-5786
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4973D3.3
THB115.12
Each (In a Tube of 40)
Units
3.5A - Buck Controller - 8 V 55 V Adjustable Surface Mount - 1 20 SOIC Yes 10 mV
RS Stock No. 165-6598
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L5973D013TR
THB49.179
Each (On a Reel of 2500)
Units
3.5A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS Stock No. 177-3614
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4962/A
THB112.95
Each
Units
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 16 PDIP Yes 50 mV
RS Stock No. 379-993
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L5972D
THB85.334
Each: (In a Pack of 5)
Units
1.5A 35 V Buck Controller 1.235 V 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 379-977
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4973D3.3
THB127.29
Each
Units
3.5A - Buck Controller - 8 V 55 V Adjustable Surface Mount - 1 20 SOIC Yes 10 mV
RS Stock No. 793-1330
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L5973D013TR
THB87.404
Each: (In a Pack of 5)
Units
3.5A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS Stock No. 178-1391
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L296P
THB200.505
Each (In a Tube of 25)
Units
4A 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 50 mV
RS Stock No. 686-8237
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4978D
THB102.61
Each
Units
2A 50 V Buck Controller 3.3 V 8 V 55 V Adjustable Surface Mount - 1 16 SOIC W Yes 10 mV
ใหม่ / New
RS Stock No. 212-2095
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.ST1PS01CJR
THB22.797
Each (On a Reel of 5000)
Units
400mA 3.3 V Step Down 0.625 V 1 V - Fixed - - 1 8 Flip-Chip - -
RS Stock No. 379-971
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4972AD
THB141.63
Each
Units
2A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Surface Mount - 1 20 SOIC Yes 30 mV
RS Stock No. 168-6794
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L5970D013TR
THB45.184
Each (On a Reel of 2500)
Units
1A - Buck Controller - 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes 10 mV
RS Stock No. 168-6459
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.L4963D
THB111.30
Each (In a Tube of 40)
Units
- 36 V Buck Controller 5.1 V 9 V 46 V Adjustable Surface Mount - 1 20 SOIC Yes 50 mV