Which is the best 3v step down?

Finding the best 3v step down suitable for your needs isnt easy. With hundreds of choices can distract you. Knowing whats bad and whats good can be something of a minefield. In this article, weve done the hard work for you.

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eBoot Mini MP1584EN DC-DC Buck Converter Adjustable Power Step Down Module 24V to 12V 9V 5V 3V, 6 Pack eBoot Mini MP1584EN DC-DC Buck Converter Adjustable Power Step Down Module 24V to 12V 9V 5V 3V, 6 Pack
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[8-PACK] LM2596 DC-DC Adjustable Buck Converter 3-40 V to 1.5-35v Step Down Power Supply High Efficiency Voltage Regulator Module [8-PACK] LM2596 DC-DC Adjustable Buck Converter 3-40 V to 1.5-35v Step Down Power Supply High Efficiency Voltage Regulator Module
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Qunqi 5pack MP1584EN ultra Small DC-DC 3A power Step-Down Adjustable Module Buck Converter 24V To 12v 9V 5V 3V for Arduino Qunqi 5pack MP1584EN ultra Small DC-DC 3A power Step-Down Adjustable Module Buck Converter 24V To 12v 9V 5V 3V for Arduino
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eBoot 6 Pack LM2596 DC to DC Buck Converter 3.0-40V to 1.5-35V Power Supply Step Down Module eBoot 6 Pack LM2596 DC to DC Buck Converter 3.0-40V to 1.5-35V Power Supply Step Down Module
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HUELE 6 Pack Mini MP1584EN DC-DC Buck Converter Adjustable P= Step Down Module 24V to 12V 9V 5V 3V, 3A HUELE 6 Pack Mini MP1584EN DC-DC Buck Converter Adjustable P= Step Down Module 24V to 12V 9V 5V 3V, 3A
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DROK 180057 LM2596 Analog Control Buck Converter DC-DC 4-32V to 1.25-30V Step-down Regulator Module 24V 12V to 5V 3A Power Inverter Volt Stabilizer with Red LED Display DROK 180057 LM2596 Analog Control Buck Converter DC-DC 4-32V to 1.25-30V Step-down Regulator Module 24V 12V to 5V 3A Power Inverter Volt Stabilizer with Red LED Display
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DZS Elec 12A DC-DC Step Down Buck Converter Low Ripple With Heat Sink 4.5V-30V to 0.8V-30V Vehicular Voltage Regulator DZS Elec 12A DC-DC Step Down Buck Converter Low Ripple With Heat Sink 4.5V-30V to 0.8V-30V Vehicular Voltage Regulator
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DROK 90483 DC Car Power Supply Voltage Regulator Buck Converter 8A/100W 12A Max DC 5-40V to 1.2-36V Step Down Volt Convert Module DROK 90483 DC Car Power Supply Voltage Regulator Buck Converter 8A/100W 12A Max DC 5-40V to 1.2-36V Step Down Volt Convert Module
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DZS Elec 6pcs Mini DC Buck Converter Adjustable Power Step-Down Module 4.75V-23V to 1V-17V DIY Portable Power Communication Equipment Aero Model Power Supply DZS Elec 6pcs Mini DC Buck Converter Adjustable Power Step-Down Module 4.75V-23V to 1V-17V DIY Portable Power Communication Equipment Aero Model Power Supply
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CC Buck Converter, DROK DC-DC Constant Current & Voltage Regulator Board 5V-36V 24V to 1.25V-32V 17V 12V 5V Step Down Transformer 5A 75W High Power LED CC Driver Module Battery Charge for Solar Panels CC Buck Converter, DROK DC-DC Constant Current & Voltage Regulator Board 5V-36V 24V to 1.25V-32V 17V 12V 5V Step Down Transformer 5A 75W High Power LED CC Driver Module Battery Charge for Solar Panels
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Reviews

1. eBoot Mini MP1584EN DC-DC Buck Converter Adjustable Power Step Down Module 24V to 12V 9V 5V 3V, 6 Pack

Feature

Mini MP1584EN DC to DC buck converter step-down module with a wide operating range
Input voltage: 4.5 V to 28 V; Output voltage: 0.8 V to 20 V
Output current: 3 A (maximum); Conversion efficiency: 92% (maximum)
Output ripple: less than 30 mV; Switching frequency: 1.5 MHz (highest), typically 1 MHz
Operating temperature: -45 to 85 ; Size: 22 mm by 17 mm by 4 mm; Warning: donotreversethepositiveandnegativeterminals to avoid any possible damage; Do not use light load (less than 10% of output power) or without load

Description


eBoot Mini MP1584EN DC to DC buck converter adjustable power step down module 24V to 12V 9V 5V 3V, 6 Pack

Specifications:
Input voltage: 4.5 V to 28 V
Output voltage: 0.8 V to 20 V
Output current: 3 A (maximum)
Conversion efficiency: 92% (maximum)
Output ripple: less than 30 mV
Switching frequency: 1.5 MHz (highest), typically 1 MHz
Operating temperature: -45 to 85
Size: 22 mm by 17 mm by 4 mm
Application: DIY mobile power, monitor power supply, power buggies, camera power supply, car power, communications equipment supply,etc.

Package includes:
6 x Mini MP1584EN DC to DC buck converter

You can adjust the voltage by placing a multi-meter on the output, synchronously, using a screw driver to adjust a potentiometer. It can be minute adjustments to achieve a precise voltage.

Kindly reminder
These boards are adjustable current limiting, fixed 3A current limit.
Please make sure that this module within its working range before using.
Please don't output short circuit, otherwise the board would burn out.
When setting the parameter, please make sure output voltage is stable before using the module to avoid any possible damage.

Tips:
Please check if the product package is intact before opening.
Please check if the negative and positive terminals are accessed correctly before operating.
The input voltage should not be over 28 V to avoid damage.

2. [8-PACK] LM2596 DC-DC Adjustable Buck Converter 3-40 V to 1.5-35v Step Down Power Supply High Efficiency Voltage Regulator Module

Feature

Input voltage rangeDC 3 -40 V (input voltage must be 1.5 V higher than the output voltage, no boost)
Output voltage rangeOutput: DC 1.5 - 35 V voltage is continuously adjustable, maximum output current is 3 A
With over-temperature and short-circuit protection, hence it is safe to use.
Easy to make it work and convenient to accurately adjust the output voltage with a mini screwdriver.
100% SATISFICATION SERVICE: If there are any problem with our products, please feel free to contact us. you can request a refund for any single module and no need to return it.; Any problems you can contact us and we will try our best to resolve it till you satisfied.NoteThe factory have tested these at max voltage so they are very high by default, takes about 15-20 turns CCW before the voltage starts ramping down)

Description

Product Features

Parameters:
Input Voltage: DC 3 -40 V
Output Voltage: DC 1.5 - 35 V
Output Current: 3A(MAX) It is recommended to use under 2A (NOTE: When using high power, add a heat sink to the power supply chip)
Load adjust ratio: +/-0.5%
Voltage adjust ratio: +/-2.5%
Transferring efficiency: 92% Max(the higher output voltage, the higher efficiency)
ON/OFF frequency: 150KHz
Output ripple: 200mV
Module feature: buck and non-isolated
Rectification method: non-synchronous rectification
Size: 5.4x2.3x1.8CM
Weight: 16g

Fuction:
1.Built in over-temperature protection function
2.Built in current limit function
3.Built in output short-circuit protection function

How to use
1.Access the power supply ( 3 -40 V), the power indicator light, the module is working properly.
2.Adjust the blue potentiometer knob (usually clockwise rotation boost, counterclockwise rotation Step-down) and monitor the output voltage with a multimeter to reach the required voltage.
3.A customer reflects the module output voltage can not be adjusted, always equal to the input voltage. When you encounter this problem, please first counterclockwise rotation potentiometer 10 laps above, and then use the module can be normal adjustment of the voltage.

Package includes:
8X LM2596 board
8 pieces of heat sink

3. Qunqi 5pack MP1584EN ultra Small DC-DC 3A power Step-Down Adjustable Module Buck Converter 24V To 12v 9V 5V 3V for Arduino

Feature

Input Voltage: 4.5V to 28V
Output Voltage:0.8V to 20V
Output Current: 1.8 A typical (3.0 Max)
Output Ripple Frequency: 340 KHz
Ripple Voltage: 30mV

Description

Description:
Size: 1.7*2.2cm
Input Voltage:4.5V-28V
Output Voltage:0.8-20V
Output Current: 3A(Max)
Working Temperature:-45c-85c
Switching Frequency: 1.5MHz
Conversion efficiency: 96%

Package Include: 1 x Buck Converter Voltage Regulator

4. eBoot 6 Pack LM2596 DC to DC Buck Converter 3.0-40V to 1.5-35V Power Supply Step Down Module

Feature

Input: DC 3 V to 40 V (input voltage must be 1.5 V higher than the output voltage, no boost)
Output: DC 1.5 V to 35 V voltage is continuously adjustable, maximum output current is 3 A
Features: all use SANYO solid-state capacitors, 36 u thickening circuit boards, high-Q inductance with LED indicator output
Quantity: 6 pieces; Size: 45 * 20 * 14 mm (with potentiometer)
Steps: connect to power source, adjust the swirl button on the blue potentiometer and monitor voltage with multimeter to get the needed voltage (The factory have tested these at max voltage so they are very high by default, takes about 15-20 turns CCW before the voltage starts ramping down)

Description


eBoot 6 Pack LM2596 DC to DC Buck Converter 3.0-40V to 1.5-35V Power Supply Step Down Module

Features:
Input: DC 3 V to 40 V (input voltage must be 1.5 V higher than the output voltage, no boost)
Output: DC 1.5 V to 35 V voltage is continuously adjustable, maximum output current is 3 A

Notes:
The input and output interface can not be reversed.
Keep it under 2.5 A and use the heat sink when working for long hours.

5. HUELE 6 Pack Mini MP1584EN DC-DC Buck Converter Adjustable P= Step Down Module 24V to 12V 9V 5V 3V, 3A

Feature

Input voltage: 4.5 V to 28 V ; Output voltage: 0.8 V to 20 V
Output current: 3 A (maximum)
Switching frequency: 1.5 MHz (highest), typically 1 MHz
Ripple voltage: 30mv
Mini MP1584EN DC-DC 3A power step down adjustable module buck converter, Ideal for DIY mobile power supply, monitor power supply.

Description

HUELE Mini MP1584EN DC-DC 3A power Step-Down Adjustable Module Buck Converter 24V To 12v 9V 5V 3V for Arduino .
You can adjust the voltage by placing a multi-meter on the output, synchronously, using a screw driver to adjust a potentiometer. It can be minute adjustments to achieve a precise voltage.

Specifications:
Input voltage: 4.5 V to 28 V
Output voltage: 0.8 V to 20 V
Output current: 3 A (maximum)
Conversion efficiency: 92% (maximum)
Output ripple: less than 30 mV
Switching frequency: 1.5 MHz (highest), typically 1 MHz
Operating temperature: -45 to 85

Package included:6 x Mini MP1584EN DC to DC buck converter

6. DROK 180057 LM2596 Analog Control Buck Converter DC-DC 4-32V to 1.25-30V Step-down Regulator Module 24V 12V to 5V 3A Power Inverter Volt Stabilizer with Red LED Display

Feature

Analog Control: adjust the screw on top of the potentiometer clockwise or counterclockwise to increase or decrease the output voltage.
Has very stable output, the output range is DC 1.25~30.0V, please note the input voltage should be higher than output voltage at least 2V.
Press the MODE switch, the display will cycle through the output voltage, output current and input voltage.
The output voltage can be turned on/off by the ON/OFF switch, when the output is off, the digital tube will display OFF.
With reversed polarity protection and short circuit protection, more safe to use; the display is very accurate.

Description

Parameters:
Input Voltage Range: 4.0V-32.0V
Output Voltage Range: 1.25V-30.0V (buck mode 2V drop)
Maximum Output Current: 3A (peak current)
Continuous Operating Current: 1.5A (total output power within 20W)
Product Weight: 24g
Voltage Measurement Accuracy: (1% + 2 digits)
Current Measurement Accuracy: 2 digits
Product Dimension: 6.0 x 3.4 x 1.3cm (L x W x H)

Features:
Input voltage display
Output voltage display
Output current display
Module switch output
Reverse polarity protection, short circuit protection

Instructions:
IN +Input Positive
IN-Input Negative
OUT +Output Positive
OUT-Output Negative
1. ON / OFF button is for controlling the output voltage, press it to alternately turn on or off the output, and it will automatically memorize the default switch status. When the output is off, the digital tube will display OFF.
2. MODE button is for mode control, press it to circularly display output voltage, output current, input voltage, and it will automatically memorize the default display mode.

Package Includes:
1 x Buck Converter

7. DZS Elec 12A DC-DC Step Down Buck Converter Low Ripple With Heat Sink 4.5V-30V to 0.8V-30V Vehicular Voltage Regulator

Feature

Module Name: 12A DC Step Down Buck Converter
Input Voltage: 4.5V-30V ; Output Voltage: 0.8V-30V( continuously adjustable ); Output Current: 0A-12A 100W ( Can be up to 200W if enhance heat dissipation )
Short-circuit protection (14A MAX) combined with over-temperature protection (Automatically shut off the output once over temperature), safe and reliable.
Coming with enhanced enhanced aluminum radiator make the work temperature is lower and more stable. 50V/MLCC chip capacitor, combined with high frequency low resistance electrolytic condenser, make the output ripple lower.
TVS tube can effectively prevent surge breakdown voltage, make the work safer and more reliable.

Description

Feature:
Module Name: 12A DC Step Down Buck Converter
Module Type: Non-isolated step-down module
Module Size: 60*51*22mm
Input Voltage: 4.5V-30V
Output Voltage: 0.8V-30V ( continuously adjustable )
Output Current: 0A-12A 100W ( Can be up to 200W if enhance heat dissipation )
Work Temperature: -40 degree to + 80 degree
Switching Frequency: 300KHz
Transfer Efficiency: 95% (MAX)
Short-circuit Protection: Yes (Limited current 14A)
Over-temperature Protection: Yes (Automatically shut off the output once over temperature)
Reverse Voltage Protection: NO ( If need, please add large current tube.)
Connection Mode: Terminals or solder terminals. V-IN for input, V-OUT for output

The module has enhanced aluminum radiator and TVS tube, which make sure the work temperature be lower and safer. 50V/MLCC chip capacitor, combined with high frequency low resistance electrolytic condenser, make the output ripple lower.
Suitable for DIY of storage battery, power transformers, adjustable voltage regulator, 24V power supply, LED lights power supplies, industrial equipment step-down etc. and other work requirements. 12V to 3.3V, 12V to 5V, 24V to 5V, 24V to 12V and so on.

Transfer Efficiency test data:
Input 12V, Output 5V/10A, Efficiency 81%
Input 12V, Output 5V/6A, Efficiency 86%
Input 24V, Output 12V/8A, Efficiency 91%
Input 24V, Output 19V/6A, Efficiency 94%

Package Include:
1pcs 12A DC Step Down Buck Converter

8. DROK 90483 DC Car Power Supply Voltage Regulator Buck Converter 8A/100W 12A Max DC 5-40V to 1.2-36V Step Down Volt Convert Module

Feature

Super dense and reinforced aluminum radiator allows lower and more Stable operating temperature
There is LED indicator in the module, making the operating status of this board Clear
It has the TVs Diode to prevent Voltage Surge from breaking the chip D, hence allowing safer module operation
Four screw holes in the board enable you to mount the module more conveniently and easier
V-twin for input and v-out for output; installation of four 3 mm screws

Description

Paremeters:
Module properties: non-isolated step-down module (BUCK)
Input voltage: DC 5-40V
Output voltage: DC 1.2-36V
Output current: 12A Max(rated 8A, peak 12A); 100W(if enhance heatsink, can reach 200W)
Operating temperature: -40 to +85 Celsius
Working frequency: 300KHz
Conversion efficiency: up to 95%
Short circuit protection: Yes (limit current is 14A)
Over-temperature protection: Yes (the board will automatically shut down the output if over-temperature)
Input reverse polarity protection: None (please install diode at input port if you need such protection)
Installation: four 3mm screws
Wiring: V-IN for input; V-OUT for output
Dimension: 60x52x20mm

Application:
For step down voltage application like battery or power transformers, DIY adjustable voltage regulator, 24V auto laptop power supply, 12v to 3.3V or
12V to 5V or 24V to 5V or 24V to 12V, etc.

Note:
Please adjust the potentiometer for at least 10 circles if you need to adjust output voltage

Testing for reference:
Input 12V, output 5V/10A, efficiency 81%
Input 12V, output 5V/6A, efficiency 86%
Input 24V, output 12V/8A, efficiency 91%
Input 24V, output 19V/6A, efficiency 94%

Package include:
1x DC Converter

9. DZS Elec 6pcs Mini DC Buck Converter Adjustable Power Step-Down Module 4.75V-23V to 1V-17V DIY Portable Power Communication Equipment Aero Model Power Supply

Feature

Input Voltage: DC 4.75V-23V, adjustable range 1.0V-17V, max output current 3A (Please enhance heat sink for full load)
Output integrated adjustable voltage, to get the output voltage you want by soldering and adjusting the potentiometer on circuit board.
When the temperature is 85 degree, automatic power-off protection, integrated reverse polarity protection.
96% high efficiency and extra small size, adopting integral power inductor and synchronous rectification control chip, smaller size, higher efficiency.
Applied to DIY portable sourse, vehicle power supply, communication equipment power supply, aero model, all kinds of occasions demanding for size and weight.

Description

Specification:
Type: Non-Isolated step-down module
Rectification Mode: Synchronous Rectification
Input Voltage: 4.75V-23V
Output Voltage: 1.0V-17V
Output Current: Peak value 3A, 1.8A for long time work
Transfer Efficiency: 96% (max)
Switching Frequency: 340KHz
Output Ripple: 30mV (no-load)
Load Regulation: +/-0.5%
Voltage Regulation: +/-2.5%
Working Temperature: -40 degree to +85 degree
Size: 17x11x3.8mm(LxWxH)
Connection Mode: Soldering
Input Mode: Soldering
Output Mode: Soldering or pin
Feature: Integral power inductor and synchronous rectification control chip, smaller size, higher efficiency.
Application: DIY portable sourse, vehicle power supply, communication equipment power supply, aero model, all kinds of occasions demanding for size and weight.

You can set a multimeter at the output port to adjust voltage synchronously, use screwdriver to adjust potentiometer. It can get accurate voltage by tiny adjustment.

Package: 6pcs Mini 360 extra small size DC-DC synchronous rectification step-down buck converter module

Attention:
These circuit board can adjust current limit, fix 3A current limit.
Please make sure this module work in its range before use.
Please don't output short circuit, or the circuit board will burn out.
When setting parameters, please make sure the output voltage keep stable to avoid possible damage.

10. CC Buck Converter, DROK DC-DC Constant Current & Voltage Regulator Board 5V-36V 24V to 1.25V-32V 17V 12V 5V Step Down Transformer 5A 75W High Power LED CC Driver Module Battery Charge for Solar Panels

Feature

DROK buck converter input voltage range is DC 5V-36V, output voltage range is DC 1.25V-32V continuously adjustable, default output 17V, max output current is 5A(please use it within 4.5A).
Equipped with Multimeter: the voltage regulator module is with voltmeter/ammeter/power meter, can be directly used without external multimeter.
Application: our buck converter with over current protect function; battery charger for solar panels, wind driven generator.; high power LED constant current driver module.
With USB Port: the step down converter is with USB port, can be used to charge for digital products.(Note: USB output voltage is the same as the module voltage output, please check before using.)
Constant Current & Constant Voltage Mode: the reducer module is with two kinds of mode: constant current and constant voltage, the indicator light will indicate which mode it is under.

Description

Parameters:
Input voltage : 5-36V (the input voltage should at least 1.5V higher than the output voltage)
Output voltage :1.25-32V (continuously adjustable,default output 17V.)
Output Current : 5A MAX(Please use it within 4.5A)
Output Power: Max 75W (Please use it within 50W. if the pressure difference is big,please reduce power)
Operating temperature: -40 to +85 C
Operating frequency: 180KHz
Conversion efficiency : up to 96%
Short circuit protection: Yes
Overtemperature protection: (automatically shut off the output after overtemperature)
Input reverse polarity protection: No, (if necessary, please in input
String into high current diode)
Installation: 4pcs 3mm screws
Wiring:(solder terminals) V-IN is the input, V-OUT is the output

Usage:
1. Use as an ordinary buck module with overcurrent protection capabilities;
2. Use as a battery charger;
3. Use it as a constant current LED driver module.

Note:
1. If the module can not be adjusted, the output voltage is always equal to the input voltage." When you encounter this problem, please counterclockwise rotation of the potentiometer 10 laps or more, then you can adjust the output voltage. Because the factory default output voltage is 17V.
2.Module output terminal string has a current sampling resistor, there will be 0-0.2V voltage drop after connected to the load, it is a normal phenomenon.
3.If its output is more than 3A/35W, please enhance heat dissipation!
4.This DC converter is single output, the output voltage of the USB port is the same as the output voltage of the module, if your load is USB device, please make sure the module's output voltage is set at 5V.
Package include:
1 x Buck Converter

Conclusion

By our suggestions above, we hope that you can found the best 3v step down for you. Please don't forget to share your experience by comment in this post. Thank you!