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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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庫存編號 102-3571
製造零件編號L5973AD
HK$17.428
毎管:100 個
單位
- 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS庫存編號 380-038
製造零件編號L5973AD
HK$24.098
/個 (每包:5個)
單位
- 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS庫存編號 265-623
製造零件編號L4974A
HK$101.71
單位
3.5A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 20 PDIP Yes 30 mV
RS庫存編號 168-5780
製造零件編號L4974A
HK$91.917
毎管:20 個
單位
3.5A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 20 PDIP Yes 30 mV
RS庫存編號 178-1392
製造零件編號L4970A
HK$114.233
毎管:25 個
單位
10A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 30 mV
RS庫存編號 177-3614
製造零件編號L4962/A
HK$29.01
單位
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 16 PDIP Yes 50 mV
RS庫存編號 251-3390
製造零件編號L4970A
HK$122.09
單位
10A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Through Hole - 1 15 MULTIWATT V Yes 30 mV
RS庫存編號 168-6046
製造零件編號L4962/A
HK$26.96
毎管:25 個
單位
- 40 V Buck Controller 5.1 V 9 V 46 V Adjustable Through Hole - 1 16 PDIP Yes 50 mV
RS庫存編號 686-8464
製造零件編號VIPER16LN
HK$8.65
/個 (每包:5個)
單位
- - - - - - - Through Hole - - 7 PDIP - -
RS庫存編號 178-1480
製造零件編號VIPER16LN
HK$7.361
毎管:50 個
單位
- - - - - - - Through Hole - - 7 PDIP - -
RS庫存編號 168-6475
製造零件編號VIPER16LD
HK$7.841
毎管:50 個
單位
- - - - - - - Surface Mount - - 16 SOIC - -
RS庫存編號 165-5504
製造零件編號ST1S06PUR
HK$6.214
個 (在毎卷:3000)
單位
- - - - 2.7 V 6 V Adjustable Surface Mount - - 6 DFN - 0.3 %
RS庫存編號 379-921
製造零件編號L5970D
HK$23.72
/個 (每包:5個)
單位
1A 35 V Buck Controller 1.2 V 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes 10 mV
RS庫存編號 168-5785
製造零件編號L4972AD
HK$38.367
毎管:40 個
單位
2A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Surface Mount - 1 20 SOIC Yes 30 mV
全新
RS庫存編號 212-2099
製造零件編號ST1PS01GJR
HK$7.802
個 (在毎卷:5000)
單位
400mA 3.3 V Step Down 0.73 V 1.8 V - Fixed - - 1 8 Flip-Chip - -
RS庫存編號 877-2848
製造零件編號ST1S03PUR
HK$12.044
/個 (每包:10個)
單位
- - - - 3 V 16 V Adjustable Surface Mount - - 6 DFN - 0.06 %
RS庫存編號 203-3426
製造零件編號ST1PS02D1QTR
HK$14.91
/個 (每包:5個)
單位
400mA 3.3 V Synchronous Buck Converter 1 V 1.8 V - Selectable - - 2 12 TQFN - -
RS庫存編號 379-971
製造零件編號L4972AD
HK$45.11
單位
2A 40 V Buck Controller 5.1 V 15 V 50 V Adjustable Surface Mount - 1 20 SOIC Yes 30 mV
全新
RS庫存編號 218-4844
製造零件編號ST1PS02B1QTR
HK$16.792
/個 (每包:5個)
單位
400mA 3.3 V Step Down -0.3 V 1.8 V - Selectable - - 2 12 TQFN12 - -
RS庫存編號 145-8601
製造零件編號L5970D
HK$17.157
毎管:100 個
單位
1A 35 V Buck Controller 1.2 V 4.4 V 36 V Adjustable Surface Mount - 1 8 SOIC Yes 10 mV