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. 525-4167
Mfr. Part No.LNK304GN
£1.078
Each (In a Pack of 5)
Units
- - - - 85 V ac 265 V ac - Surface Mount - 1 7 PDIP SMD - -
RS Stock No. 146-5628
Mfr. Part No.LNK304GN
£0.617
Each (In a Tube of 50)
Units
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Surface Mount - 1 8 SMDB - -
RS Stock No. 146-8552
Mfr. Part No.LNK304PN
£2.28
Each
Units
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS Stock No. 146-5626
Mfr. Part No.LNK304PN
£0.816
Each (In a Tube of 50)
Units
170mA 700 V Boost, Buck, Flyback -0.3 V 85 V ac 265 V ac Fixed Through Hole - 1 7 DIPB - -
RS Stock No. 887-7410
Mfr. Part No.MCP16301T-I/CHY
BrandMicrochip
£0.58
Each (On a Reel of 3000)
Units
600mA 15 V - 2 V 4 V 30 V Adjustable Surface Mount - 1 6 SOT-23 Yes 0.1 %/V
RS Stock No. 770-9476
Mfr. Part No.MCP16301T-I/CHY
BrandMicrochip
£0.81
Each (In a Pack of 4)
Units
600mA 15 V - 2 V 4 V 30 V Adjustable Surface Mount - 1 6 SOT-23 Yes 0.1 %/V
RS Stock No. 533-3692
Mfr. Part No.LM2596S-5.0/NOPB
£4.44
Each
Units
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS Stock No. 920-3586
Mfr. Part No.LM2596S-5.0/NOPB
£3.812
Each (In a Tube of 45)
Units
3A - Buck Controller, Inverting - 4.5 V 40 V Fixed Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS Stock No. 920-3595
Mfr. Part No.LM2596S-ADJ/NOPB
£3.881
Each (In a Tube of 45)
Units
3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS Stock No. 533-3715
Mfr. Part No.LM2596S-ADJ/NOPB
£4.44
Each
Units
3A 37 V Buck Controller, Inverting 1.2 V 4.5 V 40 V Adjustable Surface Mount - 1 5 D2PAK (TO-263) Yes -
RS Stock No. 533-3181
Mfr. Part No.LM2576HVT-ADJ/NOPB
£4.84
Each
Units
3A 57 V Buck Controller, Inverting 1.23 V 4 V 60 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS Stock No. 866-0802
Mfr. Part No.A4447SLJTR-T
£1.28
Each (In a Pack of 4)
Units
2A 24 V Step Down 0.8 V 8 V 50 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 177-5537
Mfr. Part No.A4447SLJTR-T
£0.61
Each (On a Reel of 1000)
Units
2A 24 V Step Down 0.8 V 8 V 50 V Adjustable Surface Mount - 1 8 SOIC Yes -
RS Stock No. 920-3508
Mfr. Part No.LM2576HVT-ADJ/NOPB
£4.138
Each (In a Tube of 45)
Units
3A 57 V Buck Controller, Inverting 1.23 V 4 V 60 V Adjustable Through Hole - 1 5 TO-220 Yes -
RS Stock No. 102-3574
Mfr. Part No.L5973D
£1.36
Each (In a Tube of 100)
Units
2A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS Stock No. 380-034
Mfr. Part No.L5973D
£2.10
Each (In a Pack of 5)
Units
2A 35 V Buck Controller 1.235 V 4 V 36 V Adjustable Surface Mount - 1 8 HSOP Yes 10 mV
RS Stock No. 533-8091
Mfr. Part No.LM2576T-5.0/NOPB
£2.17
Each
Units
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS Stock No. 100-3981
Mfr. Part No.LM2576T-5.0/NOPB
£1.85
Each (In a Tube of 45)
Units
3A - Buck Controller, Inverting - 4 V 40 V Fixed Through Hole - 1 5 TO-220 Yes -
RS Stock No. 545-7811
Mfr. Part No.PTN78000WAH
£10.79
Each
Units
1.5A - Buck Controller - - - - Through Hole - 1 5 DIP Module Yes ±10
RS Stock No. 121-8927
Mfr. Part No.PTN78000WAH
£9.958
Each (In a Tube of 56)
Units
1.5A - Buck Controller - - - - Through Hole - 1 5 DIP Module Yes ±10
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