Moduł ładowania akumulatorów Li-Ion 18650 2S 3S IP2326 USB-C Quick Charge

Module Description and Purpose

A compact Li-Ion and Li-poly battery charging module based on the efficient IP2326 control IC. In its standard configuration, the device supports 2S cell packs, with the option of a simple hardware modification to support 3S packs. The maximum charging current is 1.5A with total power up to 15W. Power can be supplied via the integrated USB-C connector or dedicated solder pads. The circuit performs a complete, safe CC/CV charging cycle-constant current and constant voltage-optimizing the process of charging 18650 cells.

Key Technical Features

• Supported cell types: Li-Ion and Li-poly
• Pack configuration: 2S (two cells) or 3S (three cells) after modification
• Input voltage: 4.5V to 5.5V
• Target charging voltage: 7.4V - 8.4V (2S mode) or 11.1V - 12.6V (3S mode)
• Maximum charging current: up to 1.5A (with hardware adjustment capability)
• High boost charging efficiency: 94%
• Switching frequency: 500 kHz
• Low quiescent current: 3uA
• Power interfaces: USB-C connector and VIN and GND solder pads
• Overall dimensions: 33 mm x 18 mm (including USB-C connector)

Protection and Status Indication

The module provides real-time status information via built-in SMD LEDs. A lit red LED confirms the presence of supply voltage. The blue LED indicates an ongoing charging process, while blinking indicates an error. An integrated controller ensures the safety of the circuit and cells, offering the following protection features:

• Short-circuit protection (SCP) and overcurrent protection (OCR)
• Overvoltage protection for charging voltage (OVP)
• Built-in thermal protection (OTR) activating at 135 degrees Celsius
• Soft-start technology minimizing inrush current during charging cycle initialization
• Connector dedicated for an external NTC 100K thermistor for precise battery pack temperature monitoring

Configuration Options

The IP2326 controller offers advanced parameter customization by replacing SMD resistors on the board. The designer can reconfigure the end-of-charge voltage (CV) by selecting the appropriate resistance on the VSET input. Constant charging current (CC) can also be calibrated by modifying the ISET component value. Additionally, the circuit allows hardware setting of the lower (RUV) and upper (ROV) supply voltage thresholds, as well as implementation of a hardware time limit for the process via the ROT input.

Example Applications

• Building multi-cell power packs based on 18650 cells
• High-efficiency power systems for mobile robots and advanced RC models
• Rebuilding and upgrading battery packs used in power tools
• Projects requiring uninterrupted DC backup power circuits (DC UPS)
• Building portable high-power power stations for electronic systems

Benefits

• High conversion efficiency of 94% reduces heating and energy losses
• Full control over the charging process (CC/CV algorithm) significantly extends the lifespan of the cells used
• Universal USB-C connector ensures seamless compatibility with commonly available power adapters
• Multiple built-in hardware protections safeguard the project against unexpected failures
• Wide parameterization options allow precise tuning of the module to specific design requirements
• Compact PCB dimensions greatly simplify integration into enclosures with limited free space