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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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 Stock No. 146-1159
Mfr. Part No.MAX638ACPA+
£1.861
Each (In a Tube of 50)
Units
75mA - Buck Controller - 2.2 (Adjustable) V, 5 (Fixed) V 16.5 V Adjustable, Fixed Through Hole - 1 8 PDIP Yes 0.2 %/V
RS Stock No. 540-4198
Mfr. Part No.MAX638ACPA+
£1.89
Each
Units
75mA - Buck Controller - 2.2 (Adjustable) V, 5 (Fixed) V 16.5 V Adjustable, Fixed Through Hole - 1 8 PDIP Yes 0.2 %/V
RS Stock No. 146-1027
Mfr. Part No.MAX764CPA+
£2.101
Each (In a Tube of 50)
Units
260mA -16 V Buck Controller -1 V 3 V 16 V Adjustable, Fixed Through Hole - 1 8 PDIP Yes 0.12 %/mV
RS Stock No. 732-8790
Mfr. Part No.MAX1771CSA+
£3.72
Each
Units
2A 100 V - 2 V 3 V 16.5 V - Surface Mount - 1 8 SOIC - -
RS Stock No. 622-8973
Mfr. Part No.MAX764CPA+
£2.21
Each
Units
260mA -16 V Buck Controller -1 V 3 V 16 V Adjustable, Fixed Through Hole - 1 8 PDIP Yes 0.12 %/mV
RS Stock No. 923-7125
Mfr. Part No.MAX1771CSA+
£2.709
Each (In a Tube of 100)
Units
2A 100 V - 2 V 3 V 16.5 V - Surface Mount - 1 8 SOIC - -
RS Stock No. 164-7727
Mfr. Part No.MAX17245ETESA+
£2.015
Each (In a Pack of 2)
Units
3.5A 10 V Buck Converter 1 V 3.5 V 36 V Adjustable Surface Mount - 1 16 TQFN Yes 0.02 %/V
New
RS Stock No. 189-7002
Mfr. Part No.MAX766ESA+
£4.655
Each (In a Tube of 100)
Units
105mA -16 V Boost/Buck Controller, Inverting, Non-Inverting -1 V 3 V 16 V Adjustable, Fixed Surface Mount - 1 8 SOIC Yes 0.12 %/mV
RS Stock No. 164-7622
Mfr. Part No.MAX17244ETERA+
£1.646
Each (In a Tube of 60)
Units
2.5A 10 V Buck Converter 1 V 3.5 V 36 V Adjustable Surface Mount - 1 16 TQFN Yes 0.02 %/V
New
RS Stock No. 192-2123
Mfr. Part No.MAX17244ETESB+
£2.382
Each (In a Pack of 5)
Units
2.5A 10 V Buck Converter 1 V 3.5 V 36 V Adjustable Surface Mount - 1 16 TQFN Yes 0.02 %/V
RS Stock No. 165-9648
Mfr. Part No.MAX638ACSA+
£2.534
Each (In a Tube of 100)
Units
1mA 5.25 V Step Down 4.75 V 2.2 V, 5 V 16.5 V Adjustable Surface Mount - 1 8 SOIC Yes 0.2 %/V
New
RS Stock No. 192-2089
Mfr. Part No.MAX17243ETPB+
£4.265
Each (In a Pack of 2)
Units
3A 10 V Buck Converter 1 V 3.5 V 36 V Adjustable Surface Mount - 1 20 TQFN Yes 0.02 %/V
New
RS Stock No. 189-7004
Mfr. Part No.MAX797HESE+
£8.114
Each (In a Tube of 50)
Units
10A 6 V Step Down 2.5 V 4.5 V 30 V Adjustable Surface Mount - 1 16 SOIC - 0.06 %/V
New
RS Stock No. 190-0052
Mfr. Part No.MAX766ESA+
£6.36
Each
Units
105mA -16 V Boost/Buck Controller, Inverting, Non-Inverting -1 V 3 V 16 V Adjustable, Fixed Surface Mount - 1 8 SOIC Yes 0.12 %/mV
New
RS Stock No. 192-2130
Mfr. Part No.MAX17245ETESB+
£2.448
Each (In a Pack of 5)
Units
3.5A 10 V Buck Converter 1 V 3.5 V 36 V Adjustable Surface Mount - 1 16 TQFN Yes 0.02 %/V
RS Stock No. 168-2923
Mfr. Part No.MAX17572ATC+
£3.00
Each (In a Pack of 2)
Units
1A 5.25 V Step Down 4.75 V 4.5 V 60 V Adjustable Surface Mount - 1 12 TDFN Yes -
RS Stock No. 168-2927
Mfr. Part No.MAX17682ATP+
£2.59
Each (In a Pack of 2)
Units
3.7A 5.25 V Buck Converter 4.75 V 4.5 V 42 V Fixed Surface Mount - 1 20 TQFN Yes -
RS Stock No. 799-7897
Mfr. Part No.MAX638ACSA+
£2.49
Each
Units
1mA 5.25 V Step Down 4.75 V 2.2 V, 5 V 16.5 V Adjustable Surface Mount - 1 8 SOIC Yes 0.2 %/V
New
RS Stock No. 192-1786
Mfr. Part No.MAX17245ETESB+
£2.225
Each (In a Tube of 60)
Units
3.5A 10 V Buck Converter 1 V 3.5 V 36 V Adjustable Surface Mount - 1 16 TQFN Yes 0.02 %/V
RS Stock No. 167-7174
Mfr. Part No.MAX17504ATP+
£2.681
Each (In a Tube of 60)
Units
3.5A 5.25 V Synchronous Step Down 4.75 V 4.5 V 60 V Adjustable Surface Mount - 1 20 TQFN Yes -