Product Overview
The XY-3606 DC-DC Buck Converter Module is a high-performance, synchronous rectification step-down power supply designed to convert higher DC voltages (9V–36V) into a stable 5V output. Whether you’re powering a Raspberry Pi from a 12V battery, creating a USB charging station for a vehicle, or supplying 5V power to industrial control systems, this module offers a compact, efficient, and reliable solution .
At its core, the XY-3606 utilizes a synchronous rectification scheme (often compared to or exceeding the performance of the classic LM2596S) to achieve high conversion efficiency of over 90% . This high efficiency means less power is wasted as heat, making it ideal for battery-powered applications where energy conservation is critical.
A standout feature of this module is its dual output capability. It provides power via traditional screw terminals for permanent wiring and a USB-A port with a fast-charge identification chip . This makes it incredibly versatile, allowing you to hardwire a device while simultaneously charging a phone or tablet. The USB port is compatible with both Android and iOS devices for smart charging .
Key Features
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Synchronous Rectification: Uses an advanced synchronous rectification scheme for high efficiency (>90%) and reduced heat generation compared to non-synchronous converters .
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Dual Output Interface: Features both a screw terminal block for permanent connections and a USB-A port with a fast-charge identification chip for direct device charging .
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High Current Capacity: Can deliver up to 5A continuous current at 5V, depending on the input voltage. With a 12V input, it can provide up to 6A (30W) .
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Wide Input Voltage Range: Accepts DC inputs from 9V to 36V, making it compatible with common 12V, 24V, and even 36V battery systems and power supplies .
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Built-in Fast Charge Recognition: The USB port includes a smart chip that automatically identifies connected devices (compatible with Android and iPhone) to enable fast charging where possible .
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Integrated Protection Features: Includes overvoltage, overcurrent, short-circuit, and over-temperature protection to safeguard the module and your connected devices .
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Compact and Lightweight: Small form factor (approx. 63mm × 27mm × 10mm) and lightweight (approx. 22g) allows for easy integration into tight spaces or portable projects .
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Easy to Use: Comes with both a DC plug (barrel jack) and screw terminals for input, and screw terminals plus a USB port for output, offering maximum flexibility in wiring .
Technical Specifications
Pinout & Interface Guide
The module is clearly laid out for easy identification and connection.
Input Side
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DC Jack (Barrel Connector): Standard 5.5mm x 2.1mm center-positive DC barrel jack for easy connection to common power adapters.
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Screw Terminals (IN+ / IN-): For hardwiring your DC power source. Connect IN+ to the positive lead and IN- to the negative/ground lead.
Output Side
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Screw Terminals (OUT+ / OUT-): For hardwiring your 5V DC load. Connect OUT+ to the positive input of your device and OUT- to its ground.
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USB-A Port: Standard female USB-A port. Provides 5V power and supports fast-charge negotiation with connected smartphones and tablets.
LED Indicator
Usage Guide
Wiring Instructions
IMPORTANT: Always disconnect the input power source before wiring or modifying connections.
Basic Connection Using Screw Terminals
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Connect Input: Connect the positive wire of your DC power source (9V-36V) to the IN+ screw terminal. Connect the negative wire to the IN- terminal.
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Connect Load: Connect the positive wire of your 5V device to the OUT+ screw terminal. Connect the negative wire to the OUT- terminal.
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Power On: Apply power to the input. The green LED should light up, and your 5V device will be powered.
Using the USB Port for Charging
Powering a Raspberry Pi from a 12V Battery
This is a classic and highly effective application for the XY-3606. The module’s 5V 5A output is perfect for powering a Raspberry Pi 4 or 5 from a 12V lead-acid or LiFePO4 battery .
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Connect the 12V battery to the IN+ and IN- terminals.
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Connect a USB-C or Micro-USB cable from the module’s USB-A port to the Raspberry Pi’s power input. (You can also use the screw terminals and a appropriate connector).
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The module will supply a clean, regulated 5V to the Pi, and the fast-charge chip will ensure proper power delivery.
Output Capacity vs. Input Voltage
The module’s maximum output current is dependent on the input voltage. This is due to thermal and electrical limitations of the conversion process. Use the following as a guide for your application :
Important: While the module is rated for 5A or 6A, achieving these currents requires adequate cooling (airflow) and proper wire gauge to minimize losses. At maximum load, the module will generate heat .
Efficiency and Thermal Performance
The XY-3606’s synchronous rectification design makes it significantly more efficient than older buck converters. This efficiency, often exceeding 90%, means that when converting 12V to 5V at 5A, less than 3W of power is dissipated as heat, keeping the module cooler and preserving battery life .
Q: What is the difference between the XY-3606 and a standard LM2596 module?
The XY-3606 uses a synchronous rectification scheme, which replaces the freewheeling diode in a standard LM2596 circuit with a low-resistance MOSFET. This significantly improves efficiency, especially at lower output voltages and higher currents. It also reduces heat generation, allowing for higher output currents (5A vs. 3A) .
Q: Can I use both the USB port and the screw terminals at the same time?
Yes. The USB port and the screw terminals are connected in parallel. You can power a device from the screw terminals while simultaneously charging a phone from the USB port. The total combined output current must not exceed the module’s maximum rating for your input voltage .
Q: Why is the output voltage listed as 5.2V and not 5.0V?
The module is designed to output a slightly higher voltage of 5.2V to compensate for voltage drop over long USB cables. This ensures that the device at the end of the cable still receives a full 5.0V. This is a common and intentional design feature for USB charging applications
Q: Can I use this module to charge a 12V battery?
No. This module is a buck (step-down) converter only. It can only convert a higher voltage to a lower voltage (9-36V down to 5V). It cannot increase voltage (boost). To charge a 12V battery, you would need a boost converter or a dedicated battery charger.
Q: What is the maximum output current I can draw at 12V input?
With a 12V input, the module is capable of delivering up to 6A (30W) of continuous output current. Ensure your power source can deliver at least 2.5A-3A at 12V to achieve this output
Q: The module gets hot when running near maximum current. Is this normal?
Yes, some heat is normal under high load. The module’s high efficiency (>90%) means that at 30W output, only about 3W is dissipated as heat, but in a small package, this will cause a noticeable temperature rise. Ensure the module is in a well-ventilated area. If it becomes too hot to touch, reduce the load or add active cooling (a small fan)
Q: Can I power a Raspberry Pi 5 with this module?
Yes. The Raspberry Pi 5 requires a 5V 5A power supply. The XY-3606 is rated to deliver 5A at 5V, making it an excellent choice for powering a Pi 5 from a 12V or 24V battery or power supply
Q: Can I use this module with a 9V battery?
Yes, but with limitations. The module’s input range is 9V-36V. At 9V input, the output capacity is reduced. It can still provide useful current, but you will not be able to achieve the full 5A or 6A output. For maximum performance, use an input voltage of 12V or higher.
Q: The module has power (LED is on) but there is no output.
Check the following:
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Ensure the output load is not shorted or drawing excessive current.
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Check that your input power source can supply enough current. A weak battery or under-rated supply may cause the module to shut down.
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The over-temperature protection may have been triggered. Allow the module to cool down and try again.
Q: Can I use this module to power a motor directly?
While possible, motors are inductive loads that can create voltage spikes and back-EMF. It is recommended to add a flyback diode across the motor terminals to protect the converter. For large or high-current motors, a dedicated motor driver is a better solution.
Q: Is the USB port compatible with fast charging for all phones?
The module includes a smart identification chip that supports common fast-charge protocols (likely including Apple’s and Android’s BC1.2 standards). While it will charge your phone effectively, it may not support proprietary ultra-fast charging standards (like OnePlus Warp Charge or Oppo VOOC) .
