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 102-5633
製造零件編號LM2832XMY/NOPB
TWD42.30
個 (在毎卷:1000)
單位
2A 4.5 V Buck Controller 0.6 V 3 V 5.5 V Adjustable Surface Mount - 1 8 MSOP Yes 0.02 %/V
RS庫存編號 651-5637
製造零件編號LM2832XMY/NOPB
TWD86.00
單位
2A 4.5 V Buck Controller 0.6 V 3 V 5.5 V Adjustable Surface Mount - 1 8 MSOP Yes 0.02 %/V
RS庫存編號 102-3574
製造零件編號L5973D
TWD85.20
毎管:100 個
單位
2A 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 380-034
製造零件編號L5973D
TWD115.60
/個 (每包:5個)
單位
2A 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 841-7594
製造零件編號MCP16331T-E/CH
BrandMicrochip
TWD52.60
/個 (每包:5個)
單位
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庫存編號 165-4061
製造零件編號MCP16331T-E/CH
BrandMicrochip
TWD48.80
個 (在毎卷:3000)
單位
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庫存編號 920-3517
製造零件編號LM2576S-12/NOPB
TWD131.50
毎管:45 個
單位
3A - Buck Controller, Inverting - 4 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS庫存編號 533-3197
製造零件編號LM2576S-12/NOPB
TWD155.00
單位
3A - Buck Controller, Inverting - 4 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS庫存編號 910-1581
製造零件編號MIC4680YM
BrandMicrochip
TWD87.50
/個 (每包:2個)
單位
1.3A - Buck Controller 1.25 V 4 V 34 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS庫存編號 922-3558
製造零件編號TPS62420DRCT
TWD61.00
個 (在毎卷:250)
單位
- - - - - - - - - - - - - -
RS庫存編號 533-3715
製造零件編號LM2596S-ADJ/NOPB
TWD278.00
單位
3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS庫存編號 100-3980
製造零件編號LM2576T-12/NOPB
TWD119.70
毎管:45 個
單位
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS庫存編號 379-977
製造零件編號L4973D3.3
TWD181.00
單位
3.5A - Buck Controller - 8 V 55 V Adjustable Surface Mount - 1 20 SOIC Yes 10 mV
RS庫存編號 533-8085
製造零件編號LM2576T-12/NOPB
TWD141.00
單位
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS庫存編號 146-0313
製造零件編號MIC4680YM
BrandMicrochip
TWD72.80
毎管:95 個
單位
1.3A - Buck Controller 1.25 V 4 V 34 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS庫存編號 661-7055
製造零件編號TPS62420DRCT
TWD90.00
單位
1A 6 V Buck Controller 0.6 V 2.5 V 6 V Adjustable Surface Mount - 2 10 SON Yes -
RS庫存編號 168-5786
製造零件編號L4973D3.3
TWD146.40
毎管:40 個
單位
3.5A - Buck Controller - 8 V 55 V Adjustable Surface Mount - 1 20 SOIC Yes 10 mV
RS庫存編號 920-3595
製造零件編號LM2596S-ADJ/NOPB
TWD234.80
毎管:45 個
單位
3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS庫存編號 460-459
製造零件編號LM2575HVS-ADJ/NOPB
TWD251.00
單位
1A 57 V Buck Controller, Inverting 1.23 V 4 V 60 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS庫存編號 162-9889
製造零件編號TPS563209DDCT
TWD30.40
個 (在毎卷:250)
單位
3A 7 V Synchronous Step Down 0.76 V 4.5 V 17 V Adjustable Surface Mount - 1 6 SOT-23 Yes -