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 921-3053
製造零件編號TPS54320RHLR
TWD43.60
個 (在毎卷:3000)
單位
3A 15 V Buck 0.8 V 1.6 V 17 V Adjustable Surface Mount - 1 14 VQFN Yes -
RS庫存編號 102-3576
製造零件編號L4973D5.1
TWD127.20
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 155-6664
製造零件編號LT3502EDC#TRMPBF
TWD111.80
個 (在毎卷:500)
單位
500mA 50 V Buck Controller 0.8 V 3 V 40 V - Surface Mount - 1 10 DFN Yes 0.005 %/V
RS庫存編號 922-2246
製造零件編號LMZ14201TZ-ADJ/NOPB
TWD298.10
個 (在毎卷:250)
單位
1A 6 V Buck Controller 0.8 V 6 V 42 V Adjustable Surface Mount - 1 7 TO-PMOD Yes 0.01 %
RS庫存編號 121-8702
製造零件編號LM2575T-12/NOPB
TWD82.10
毎管:45 個
單位
1A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS庫存編號 779-9643
製造零件編號LT3502EDC#TRMPBF
TWD186.00
/個 (每包:2個)
單位
500mA 50 V Buck Controller 0.8 V 3 V 40 V - Surface Mount - 1 10 DFN Yes 0.005 %/V
RS庫存編號 825-6835
製造零件編號TPS5430DDAR
TWD138.50
/個 (每包:2個)
單位
3A 31 V Buck 1.22 V 5.5 V 36 V Adjustable Surface Mount - 1 8 SOIC - -
RS庫存編號 825-6838
製造零件編號TPS54320RHLR
TWD85.00
/個 (每包:2個)
單位
3A 15 V Buck 0.8 V 1.6 V 17 V Adjustable Surface Mount - 1 14 VQFN Yes -
RS庫存編號 100-3981
製造零件編號LM2576T-5.0/NOPB
TWD84.80
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 698-9079
製造零件編號TPS54060DGQ
TWD115.00
單位
500mA - Buck Controller - 3.5 V 60 V Adjustable Surface Mount - 1 10 HTSSOP Yes -
RS庫存編號 822-5692
製造零件編號LTC3810EG#PBF
TWD291.00
單位
2A 100 V Step Down 0.8 V 6.35 V 14 V Adjustable Surface Mount - 1 28 SSOP Yes 0.02 %/V
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 923-6677
製造零件編號TPS54060DGQ
TWD94.30
毎管:80 個
單位
500mA - Buck Controller - 3.5 V 60 V Adjustable Surface Mount - 1 10 HTSSOP Yes -
RS庫存編號 639-4339
製造零件編號LM5005MH/NOPB
TWD176.00
單位
2.5A - Buck Controller, Inverting - 7 V 75 V Adjustable Surface Mount - 1 20 TSSOP Yes -
RS庫存編號 100-3942
製造零件編號LM2676S-ADJ/NOPB
TWD192.60
毎管:45 個
單位
3A 37 V Buck Controller 1.2 V 8 V 40 V Adjustable Surface Mount - 1 7 D2PAK (TO-263) Yes -
RS庫存編號 922-2432
製造零件編號LMZ12002TZE-ADJ/NOPB
TWD309.60
毎管:45 個
單位
2A 6 V Buck Controller 0.8 V 4.5 V 20 V Adjustable Surface Mount - 1 7 TO-PMOD Yes 0.01 %
RS庫存編號 100-3978
製造零件編號LM2575T-5.0/NOPB
TWD83.80
毎管:45 個
單位
1A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS庫存編號 533-8057
製造零件編號LM2575T-12/NOPB
TWD97.00
單位
1A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS庫存編號 858-0630
製造零件編號LT8614EUDC#PBF
TWD354.00
單位
4A - Step Down - 3.4 V 42 V Adjustable Surface Mount - 1 18 QFN Yes 0.02 %/V
RS庫存編號 921-3044
製造零件編號TPS5430DDAR
TWD61.90
個 (在毎卷:2500)
單位
3A 31 V Buck 1.22 V 5.5 V 36 V Adjustable Surface Mount - 1 8 SOIC - -