Buck Converters


A Buck Converter, also known as a Step-Down Converter, is a DC-to-DC power converter which steps down 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 that 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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Part Details Brand Controller Type Recently Introduced Maximum Output Current Maximum Output Voltage Regulator Function Minimum Output Voltage Minimum Input Voltage Minimum Output Current Maximum Input Voltage Converter Type Output Type Series Mounting Type Number of Outputs Pin Count Package Type Line Regulation Load Regulation Maximum Operating Temperature Maximum Switching Frequency Dimensions Height Length Width Minimum Operating Temperature Efficiency
4.5 V to 60 V Input, 6 A microBUCK® DC/
  • £ 1.673
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Vishay - - - - - - - - - - - - - - - - - - - - - - - - - -
4.5 V to 60 V Input, 6 A microBUCK® DC/ Vishay - - - - - - - - - - - - - - - - - - - - - - - - - -
4.5 V to 60 V Input, 10 A microBUCK® DC/
  • £ 1.931
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Vishay - - - - - - - - - - - - - - - - - - - - - - - - - -
4.5 V to 60 V Input, 10 A microBUCK® DC/ Vishay - - - - - - - - - - - - - - - - - - - - - - - - - -
4.5 V to 60 V Input, 2 A microBUCK® DC/D
  • £ 1.148
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Vishay - - - - - - - - - - - - - - - - - - - - - - - - - -
4.5 V to 60 V Input, 2 A microBUCK® DC/D Vishay - - - - - - - - - - - - - - - - - - - - - - - - - -
4.5 V to 60 V Input, 3A microBUCK® DC/DC
  • £ 1.436
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Vishay - - - - - - - - - - - - - - - - - - - - - - - - - -
4.5 V to 60 V Input, 3A microBUCK® DC/DC Vishay - - - - - - - - - - - - - - - - - - - - - - - - - -
Analog Devices, ADP2503ACPZ-3.3-R7 Step-Down Switching Regulator, 1-Channel 600mA 10-Pin, LFCSP
  • £ 1.754
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Analog Devices - - 600mA 5 V - 2.8 V 2.3 V - 5.5 V - Fixed - Surface Mount 1 10 LFCSP 0.6 % 0.6 % +125 °C 2.9 MHz 3.1 x 3.1 x 0.8mm 0.8mm 3.1mm 3.1mm -40 °C -
Microchip Technology, MIC4684YM-TR Step-Down Switching Regulator, 1-Channel 2A Adjustable 8-Pin, SOP Microchip Technology - - 2A - - 1.24 V 4 V - 30 V - Adjustable - Surface Mount 1 8 SOP - - +125 °C 200 kHz 4.93 x 3.94 x 1.48mm 1.48mm 4.93mm 3.94mm -40 °C -
Microchip Technology, LM2576-12WU Adjustable Switching Regulator, 1-Channel 3A 5-Pin, D2PAK Microchip Technology - - 3A 12 V - - 4 V - 40 V - Fixed - Surface Mount 1 5 TO-263 - - +85 °C 52 kHz 0.4 x 0.17 x 0.36in 9.14mm 10.16mm 4.32mm -40 °C -
Microchip Technology, LM2576WT Adjustable Switching Regulator, 1-Channel 3A Adjustable 5-Pin, TO-220 Microchip Technology - - 3A 37 V - 1.23 V 4 V - 40 V - Adjustable - Through Hole 1 5 TO-220 - - +85 °C 52 kHz 10.16 x 4.5 x 14.68mm 14.68mm 10.16mm 4.5mm -40 °C -
Analog Devices, ADP2302ARDZ Step-Down Switching Regulator, 1-Channel 2A Adjustable 8-Pin, SOIC Analog Devices - - 2A - Step Down 0.8 V 3 V - 20 V - Adjustable - Surface Mount 1 8 SOIC - - +125 °C 805 kHz 5 x 4 x 1.65mm 1.65mm 5mm 4mm -40 °C -
Microchip Technology, LM2576-12WT Adjustable Switching Regulator, 1-Channel 3A 5-Pin, TO-220 Microchip Technology - - 3A 12 V - - 4 V - 40 V - Fixed - Through Hole 1 5 TO-220 - - +85 °C 52 kHz 10.16 x 4.5 x 14.68mm 14.68mm 10.16mm 4.5mm -40 °C -
Microchip Technology, LM2575WU Adjustable Switching Regulator, 1-Channel 1A Adjustable 5-Pin, D2PAK Microchip Technology - - 1A 37 V - 1.23 V 4 V - 40 V - Adjustable - Surface Mount 1 5 TO-263 - - +85 °C 52 kHz 10.66 x 9.16 x 4.29mm 4.29mm 10.66mm 9.16mm -40 °C -
Microchip Technology, MIC4576WU Switching Regulator, 1-Channel 3A Adjustable 5-Pin, D2PAK Microchip Technology - - 3A 33 V Buck Regulator 1.23 V 4 V - 36 V - Adjustable - Surface Mount 1 5 TO-263 - - +85 °C 200 kHz 0.405 x 0.36 x 0.17in 4.32mm 10.29mm 9.14mm -40 °C 75%
Microchip Technology, MIC4575WU Switching Regulator, 1-Channel 1A Adjustable 5-Pin, D2PAK Microchip Technology - - 1A 24 V Buck Regulator 1.23 V 4 V - 24 V - Adjustable - Surface Mount 1 5 TO-263 - - +85 °C 200 kHz 10.66 x 9.16 x 4.59mm 4.59mm 10.66mm 9.16mm -40 °C 75%
Allegro Microsystems, A4403GEUTR-T Step-Down Switching Regulator, 1-Channel 3A 16-Pin, QFN
  • £ 0.813
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Allegro Microsystems - - 3A - Buck Controller - 9 V - 46 V - - - Surface Mount 1 16 QFN - - +105 °C 2000 kHz 4 x 4 x 0.75mm 0.75mm 4mm 4mm -40 °C -
Allegro Microsystems, A4447SLJTR-T Step-Down Switching Regulator, 1-Channel 2A Adjustable 8-Pin, SOIC Allegro Microsystems - - 2A 24 V Step Down 0.8 V 8 V - 50 V - Adjustable - Surface Mount 1 8 SOIC - - +85 °C - 4.9 x 3.9 x 1.55mm 1.55mm 4.9mm 3.9mm -20 °C -
Allegro Microsystems, A8498SLJTR-T Step-Down Switching Regulator, 1-Channel 3A Adjustable 8-Pin, SOIC
  • £ 0.716
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Allegro Microsystems - - 3A 24 V Buck Controller 0.8 V 8 V - 50 V - Adjustable - Surface Mount 1 8 SOIC - - +85 °C - 4.9 x 3.9 x 1.5mm 1.5mm 4.9mm 3.9mm -20 °C -
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