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 463-050
製造零件編號LM2576T-ADJG
TWD74.20
/個 (每包:5個)
單位
3A 37 V Buck Controller, Inverting 1.23 V 7 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS庫存編號 786-2397
製造零件編號LM2596DSADJR4G
TWD80.40
/個 (每包:5個)
單位
3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK Yes -
RS庫存編號 786-2391
製造零件編號LM2596TVADJG
TWD142.80
/個 (每包:5個)
單位
3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS庫存編號 100-7567
製造零件編號LM2576T-ADJG
TWD62.90
毎管:50 個
單位
3A 37 V Buck Controller, Inverting 1.23 V 7 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS庫存編號 121-6367
製造零件編號LM2596TVADJG
TWD67.10
毎管:50 個
單位
3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS庫存編號 121-6369
製造零件編號LM2596DSADJR4G
TWD46.50
個 (在毎卷:800)
單位
3A 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK Yes -
RS庫存編號 101-8273
製造零件編號LM2576T-005G
TWD65.50
毎管:50 個
單位
3A 5.25 V Buck Controller, Inverting 4.75 V 7 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS庫存編號 786-2331
製造零件編號LM2575D2T-12R4G
TWD79.50
/個 (每包:2個)
單位
1A 12 V Buck Controller - 4.75 V 40 V Fixed Surface Mount - 1 5 D2PAK Yes -
RS庫存編號 786-2341
製造零件編號LM2575T-3.3G
TWD78.00
/個 (每包:5個)
單位
1A 3.3 V Buck Controller - 4.75 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS庫存編號 163-2401
製造零件編號LM2575T-ADJG
TWD65.10
毎管:50 個
單位
1A 37 V Buck Controller, Inverting 1.23 V 4.75 V 40 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS庫存編號 161-2690
製造零件編號NCP1597AMNTWG
TWD22.30
/個 (每包:30個)
單位
2A 3.3 V Synchronous Buck Regulator 1.2 V 4 V 5.5 V Adjustable Surface Mount - 1 6 DFN Yes 0.06 %/V
RS庫存編號 689-9935
製造零件編號LM2574N-5G
TWD57.00
單位
500mA 5.25 V Buck Controller, Inverting 4.75 V 4.75 V 40 V Fixed Through Hole - 1 8 PDIP Yes -
RS庫存編號 791-9645
製造零件編號ADP3212MNR2G
TWD53.00
/個 (每包:5個)
單位
52A 1.5 V Buck Controller 0.3 V 3.3 V 22 V Adjustable Surface Mount - 2 48 QFN Yes 0.02 %
RS庫存編號 170-3385
製造零件編號NCP3230MNTXG
TWD49.90
個 (在毎卷:2500)
單位
140µA 5.45 V Synchronous Buck Controller 4.9 V 4.5 V 18 V Adjustable Surface Mount - 1 40 QFN - -
RS庫存編號 791-9689
製造零件編號NCP1595AMNR2G
TWD31.40
Each (On a Tape of 10)
單位
1.5A 3.3 V Buck Controller 0.8 V 4 V 5.5 V Adjustable Surface Mount - 1 6 DFN Yes 0.06 %/V
RS庫存編號 805-1324
製造零件編號LM2595DSADJR4G
TWD87.40
/個 (每包:5個)
單位
1A 37 V Step Down 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK Yes -
RS庫存編號 786-2381
製造零件編號LM2576TV-5G
TWD73.60
/個 (每包:5個)
單位
3A 5 V Buck Controller - - 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS庫存編號 163-2397
製造零件編號LM2574N-ADJG
TWD51.60
毎管:50 個
單位
500mA 37 V Buck Controller, Inverting 1.23 V 4.75 V 40 V Adjustable Through Hole - 1 8 PDIP Yes -
RS庫存編號 121-6362
製造零件編號LM2574DW-ADJR2G
TWD31.90
個 (在毎卷:1000)
單位
500mA 37 V Buck Controller 1.23 V 4.75 V 40 V Adjustable Surface Mount - 1 16 SOIC Yes -
RS庫存編號 786-2385
製造零件編號LM2594DADJR2G
TWD58.70
/個 (每包:10個)
單位
500mA 37 V Buck Controller 1.23 V 4.5 V 40 V Adjustable Surface Mount - 1 8 SOIC Yes -