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 121-9326
製造零件編號LMZ10503TZE-ADJ/NOPB
TWD265.60
毎管:45 個
單位
3A 5 V Buck Controller 0.8 V 2.95 V 5.5 V Adjustable Surface Mount - 1 7 TO-PMOD Yes 0.04 %
RS庫存編號 917-5793
製造零件編號MP2459GJ-P
TWD56.00
/個 (每包:5個)
單位
500mA - Step Down 0.81 V 4.5 V 55 V Adjustable Surface Mount - 1 6 TSOT-23 Yes -
RS庫存編號 620-0868
製造零件編號DCP010505DBP-U
TWD309.00
單位
100mA ±5.75 V Buck Controller ±4.25 V 4.5 V 5.5 V Fixed Surface Mount - 2 7 SOP Yes 15 %
RS庫存編號 145-7114
製造零件編號DCP010505DBP-U
TWD295.90
毎管:25 個
單位
100mA ±5.75 V Buck Controller ±4.25 V 4.5 V 5.5 V Fixed Surface Mount - 2 7 SOP Yes 15 %
RS庫存編號 100-3973
製造零件編號LM3578AN/NOPB
TWD78.40
毎管:40 個
單位
750mA - Buck Controller, Inverting - 2 V 40 V Adjustable Through Hole - 1 8 MDIP Yes 0.01 %/V
RS庫存編號 145-6865
製造零件編號LM25574MT/NOPB
TWD115.70
毎管:92 個
單位
500mA - Buck Controller, Inverting - 6 V 42 V Adjustable Surface Mount - 1 16 TSSOP Yes -
RS庫存編號 288-780
製造零件編號LM25574MT/NOPB
TWD136.00
單位
500mA - Buck Controller, Inverting - 6 V 42 V Adjustable Surface Mount - 1 16 TSSOP Yes -
RS庫存編號 545-5023
製造零件編號LT1074CT#PBF
TWD420.00
單位
10A 50 V Buck Controller 2.5 V 7.3 V 45 V Adjustable Through Hole - 1 5 TO-220 Yes 0.02 %/V
RS庫存編號 786-3176
製造零件編號ADP5052ACPZ-R7
TWD290.00
單位
1.2 A, 4 A, 200 mA 1.6 V, 1.8 V, 5 V, 5.5 V Boost/Buck Controller, Inverting 0.85 V, 1.2 V, 2.5 V, 3.3 V 4.5 V 15 V Adjustable, Fixed Surface Mount - 5 48 LFCSP - -
RS庫存編號 900-9851
製造零件編號TPS563209DDCT
TWD36.60
/個 (每包:5個)
單位
3A 7 V Synchronous Step Down 0.76 V 4.5 V 17 V Adjustable Surface Mount - 1 6 SOT-23 Yes -
RS庫存編號 102-5635
製造零件編號LM2831XMF/NOPB
TWD53.90
個 (在毎卷:1000)
單位
1.5A 4.5 V Buck Controller 0.6 V 3 V 5.5 V Adjustable Surface Mount - 1 5 SOT-23 Yes -
RS庫存編號 146-5652
製造零件編號LNK306PN
TWD36.00
毎管:50 個
單位
360mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS庫存編號 162-9889
製造零件編號TPS563209DDCT
TWD21.20
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 -
RS庫存編號 162-8181
製造零件編號LM21212MH-1/NOPB
TWD211.80
毎管:73 個
單位
12A 5.5 V Buck Controller 0.6 V 2.95 V 5.5 V Adjustable Surface Mount - 1 20 HTSSOP Yes 0.1 %/V
RS庫存編號 533-5862
製造零件編號LM3578AN/NOPB
TWD92.00
單位
750mA - Buck Controller, Inverting - 2 V 40 V Adjustable Through Hole - 1 8 MDIP Yes 0.01 %/V
RS庫存編號 170-9356
製造零件編號MP2459GJ-P
TWD32.30
個 (在毎卷:500)
單位
500mA - Step Down 0.81 V 4.5 V 55 V Adjustable Surface Mount - 1 6 TSOT-23 Yes -
RS庫存編號 798-1117
製造零件編號LMZ10503TZE-ADJ/NOPB
TWD308.00
單位
3A 5 V Buck Controller 0.8 V 2.95 V 5.5 V Adjustable Surface Mount - 1 7 TO-PMOD Yes 0.04 %
RS庫存編號 786-9749
製造零件編號LT8610EMSE#PBF
TWD294.00
單位
2.5A 12 V Synchronous Buck Controller 0.97 V 3.4 V 42 V Adjustable Surface Mount - 1 16 MSOP Yes 0.02 %/V
RS庫存編號 651-5687
製造零件編號LM2831XMF/NOPB
TWD54.00
單位
1.5A 4.5 V Buck Controller 0.6 V 3 V 5.5 V Adjustable Surface Mount - 1 5 SOT-23 Yes -
RS庫存編號 912-9958
製造零件編號ADP5052ACPZ-R7
TWD169.10
個 (在毎卷:750)
單位
1.2 A, 4 A, 200 mA 1.6 V, 1.8 V, 5 V, 5.5 V Boost/Buck Controller, Inverting 0.85 V, 1.2 V, 2.5 V, 3.3 V 4.5 V 15 V Adjustable, Fixed Surface Mount - 5 48 LFCSP - -