1.2-34V 5A DC-DC Step-Down CC/CV Buck Converter with Volt, Amp & Power Meter -- XL4015 Battery Charger & LED Driver with USB Output

More than just a voltage regulator -- this XL4015 5A CC/CV Step-Down Buck Converter is a complete adjustable power module with Constant Voltage and Constant Current control, a built-in LED display showing real-time voltage, current, and power, and both screw terminal and USB outputs. Whether you're charging batteries, driving high-power LEDs, building a bench power supply, or regulating solar panel output, this module does it all -- and shows you exactly what it's doing on the display.

⚠️ Important: Always set the output voltage and current BEFORE connecting your load. Use the two onboard potentiometers to adjust CV (voltage) and CC (current limit). Verify settings on the built-in display or with a multimeter before connecting batteries, LEDs, or other devices.

🔧 How It Works

This module has two control modes that work together automatically:

• Constant Voltage (CV) mode: Maintains your set output voltage regardless of load -- like a standard power supply.
• Constant Current (CC) mode: When the load tries to draw more current than your set limit, the module automatically reduces voltage to maintain a steady current -- essential for safely charging batteries and driving LEDs.

Setup in 5 steps:

1. Connect input power: Wire your 8V–36V DC supply to the IN+ and IN− screw terminals. Observe polarity.
2. Set output voltage: Turn the CV-ADJ potentiometer while watching the display until you reach your desired voltage.
3. Set current limit: Temporarily short the output terminals, then turn the CC-ADJ potentiometer to set your desired current limit. Remove the short.
4. Connect your load: Wire your battery, LED, or circuit to the OUT+ / OUT− screw terminals, or plug a USB device into the USB port (when set to 5V).
5. Monitor: Press the display button to cycle through input voltage, output voltage, output current, and output power readings.

⚡ Key Features

• Dual CC/CV Control: Two onboard multi-turn potentiometers let you independently set output voltage (1.2V–34V) and current limit (0–5A). The module automatically switches between modes based on load demand.
• Built-in LED Meter: No external multimeter needed. The onboard display shows input voltage, output voltage, output current, and output power -- cycle through modes with a push button.
• Dual Output Connections: Screw terminals for general wiring plus a USB Type-A port for charging phones, powering Raspberry Pi, or any USB device.
• High Efficiency: Up to 96% conversion efficiency at 180 KHz switching frequency -- far less heat than linear regulators.
• Wide Voltage Range: Accepts 8V–36V input and outputs 1.2V–34V, covering virtually any DC step-down application.
• Comprehensive Protection: Over-temperature, over-current, short-circuit, and reverse polarity (input) protection built in.
• Multi-Turn Potentiometers: Fine, precise adjustment of voltage and current -- no jumpy single-turn pots.

📐 Specifications

📡 LED Display Modes

📦 What's in the Box

• 1x XL4015 5A CC/CV Step-Down Buck Converter Module with LED Display

DC power supply, battery, load, wires, and multimeter are not included.

🛒 What You'll Need

• DC power supply -- 8V–36V, rated for the current your load requires (must be at least 1.5V above your desired output voltage)
• Small screwdriver -- Phillips or flathead for adjusting the multi-turn potentiometers
• Wire -- Appropriate gauge for your current (18 AWG for 5A, 20 AWG for 3A)
• Multimeter -- Recommended for verifying display accuracy during initial setup

🔌 Compatible With

• Any DC power source from 8V to 36V (power supplies, batteries, solar panels)
• Li-ion, LiPo, LiFePO4, lead-acid, and NiMH rechargeable batteries
• High-power LEDs and LED arrays (constant current driving)
• USB devices (phones, tablets, Raspberry Pi, Arduino) when set to 5V output
• Any DC load requiring 1.2V–34V at up to 5A

🎯 Typical Applications

• Battery charging -- Li-ion (4.2V), LiFePO4 (3.65V), 12V lead-acid (14.4V) with CC/CV profiles
• High-power LED and laser diode driving with constant current
• DIY adjustable bench power supply with built-in metering
• USB charging station for phones, tablets, and single-board computers
• Solar panel voltage regulation for off-grid battery charging
• Automotive and marine electronics -- step down 12V/24V to any lower voltage
• STEM education -- demonstrate voltage regulation, current limiting, and power conversion
• Powering microcontroller projects (Arduino, ESP32, Raspberry Pi) from higher-voltage sources

💡 Tip: Full documentation including step-by-step setup, CC/CV adjustment, battery charging settings for different chemistries, LED driving, and troubleshooting is available on the Envistia Mall product support website. Search for "XL4015 User Guide".

⚠️ Important Notes

• Always set voltage and current BEFORE connecting your load. This is the single most important rule for safe operation.
• Input must be at least 1.5V higher than output. If the dropout margin is too small, the module cannot regulate properly.
• Do not exceed 36V input. Exceeding maximum input voltage will permanently damage the XL4015 IC.
• Maximum continuous current is 4A. 5A is peak only -- sustained operation above 4A requires active cooling (heatsink + fan).
• No automatic charge termination. This module does NOT auto-cutoff when a battery is full. Monitor lithium battery charging and disconnect when current tapers to near zero.
• USB port outputs whatever voltage is set on the module -- it is NOT automatically 5V. Always verify output voltage before connecting USB devices.
• The potentiometers are multi-turn. You may need 10–20 full rotations to move through the full range. Turn slowly and watch the display.
• Add a fuse on the input side for permanent installations (7A fast-blow recommended).

🏪 About Envistia Mall

Envistia Mall is a US-based electronics retailer specializing in development boards, sensors, modules, and components for makers, engineers, and educators. We ship from the United States with fast handling times. Product documentation and technical support are available at our dedicated support site.

📦 Fast Free US Shipping  |  🔄 Hassle-Free Returns  |  📧 Responsive Customer Support

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