6-24V 12V to 5V 3A Car USB DC-DC Buck Step-Down Charger Module

6-24V 12V to 5V 3A Car USB DC-DC Buck Step-Down Charger Module is a sub-miniature synchronous rectification step-down USB charger board that converts a wide 6V to 24V DC input (such as a 12V automotive battery or 3S/4S/6S robotics pack) into a regulated 5.1V–5.2V 3A USB Type-A output. Featuring up to 97.5% conversion efficiency, an onboard 1.5A input fuse, reverse-polarity diode, 300W output TVS overvoltage clamp, and automatic Apple/Android USB charge identification, it provides safe, ultra-efficient 5V USB power in vehicles and mobile robots.

Key Features:

• 97.5% Synchronous Buck Efficiency: Synchronous rectification and a flat-copper wound power inductor achieve up to 97.5% efficiency with ultra-low ~10mVp-p output ripple.
• Triple Hardware Device Protection: Protects expensive smartphones and SBCs using an input reverse-polarity Schottky diode, an onboard 1.5A SMD fuse, and an output 5V 300W TVS overvoltage clamp diode.
• Smart USB Charge Identification IC: Automatically negotiates optimal charging current with iPhone, iPad, and Android USB devices plugged into the female USB-A socket.
• Ultra-Low 0.85mA Quiescent Current: Draws less than 1mA at no load, allowing permanent connection to a 12V car battery or ACC line without draining the battery.
• 5.1V–5.2V Cable-Drop Compensation: Slightly elevated 5.1V–5.2V output compensates for USB cable resistance under 2A–3A load.

Technical Specifications:

• Input Voltage Range: 6.0V to 24.0V DC (12V Automotive Nominal)
• Output Voltage: 5.1V to 5.2V DC Regulated
• Maximum Output Current: 3.0A Peak / 2.0A Continuous (Add airflow/cooling at 24V in, 3A out)
• Peak Conversion Efficiency: Up to 97.5% (at 6.5V to 5V 0.7A)
• Switching Frequency: 500 kHz
• Output Ripple: ~10 mVp-p (at 12V to 5V 3A, 20MHz BW)
• Quiescent Standby Current: 0.85 mA
• Operating Temperature Range: -40°C to +85°C

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided Red/Blue Fiberglass Board
• Inductor: Flat-Copper High-Efficiency Toroidal/Molded Inductor
• Output Interface: Standard USB Type-A Female Receptacle

Dimensions:

• Length: 26.4 mm
• Width: 15.0 mm
• Height: 7.4 mm
• Weight: ~9 g

Pinout and Wiring:

• IN+ Pad: Connect to 6V–24V DC positive supply (e.g. 12V car battery/ACC wire or 3S/4S LiPo).
• IN- Pad: Connect to DC negative ground (GND).
• USB Type-A Female Socket: Regulated 5.1V–5.2V up to 3A USB output.

Datasheet Reference:

• Topology: 500kHz Synchronous Step-Down Regulator + USB D+/D- Auto-Identification IC + TVS Clamp

Commonly Used in:

• 12V Car, Motorcycle, and Boat Hardwired Dashcam & Phone Chargers
• Raspberry Pi & ESP32 Power Supplies on 12V/24V Robots
• Solar Panel (12V/18V) Direct-to-USB Smartphone Chargers
• Custom Dashboard & Motorcycle Handlebar USB Ports

Applications:

• Hardwires behind a car dashboard to power a 5V dashcam, GPS navigator, or smartphone from the 12V ACC fuse box without occupying the cigarette lighter socket.
• Powers a Raspberry Pi or Jetson Nano safely from a 12V robot battery, backed by the onboard 300W TVS overvoltage clamp that prevents 12V pass-through faults.
• Pairs with a 12V/18V solar panel to build a rugged outdoor USB charging station.

Equivalent Models:

• XY-3606 9V-36V 24V/12V to 5V 5A USB Step-Down Buck Converter Module: Higher-current 5A version with DC barrel jack and screw terminals.
• MP2315 12V-24V to 5V 3A Super Mini DC-DC Step-Down Buck Module: Ultra-miniature solder-pad buck board without the USB socket.

Package Includes:

• 1 × 6-24V 12V to 5V 3A Car USB DC-DC Buck Step-Down Charger Module