USB-C 3A Lithium Battery Charger Module (5V To 4.2V)

This compact USB Type-C charging module provides fast, efficient charging for single-cell lithium-ion and lithium-polymer batteries. Built around the IP2312 charging controller, it supports charging currents up to 3A and uses a multi-stage CC/CV charging process for reliable battery charging.

The module supports both USB-C to USB-C and USB-A to USB-C cables.

Features

• Up to 3A charging current

• USB Type-C input

• Solder pads input

• Supports USB-C to USB-C and USB-A to USB-C cables

• Designed for single-cell 4.2V lithium batteries

• Automatic trickle, constant-current, and constant-voltage charging

• Automatic charging restart when battery voltage drops

• Adjustable charging current

• Red and blue charging-status indicators

• Up to 95% conversion efficiency

• Compact design for DIY electronics and embedded applications

Trickle Charging

When the battery voltage is below 3.0V, the module enters trickle-charge mode and charges the battery at 100mA.

Constant-Current Charging

Once the battery voltage rises above 3.0V, the charger switches to constant-current mode and charges at the configured current.

The default charging current is 3A.

Constant-Voltage Charging

As the battery approaches 4.2V and the charging current falls below 300mA, the charger enters constant-voltage mode.

During this stage, the module periodically checks the battery voltage. If the battery voltage is above approximately 4.15V, charging stops. If the voltage remains below this level, charging continues, and the battery is checked again.

Automatic Recharge

After charging is complete, the module continues monitoring the battery. If the battery voltage drops below approximately 4.1V, charging automatically begins again.

LED Indicators

• Red LED: Charging/working

• Blue LED: Fully charged

Charging Current Adjustment

The module is configured for 3A charging by default.

The charging current can be changed by modifying the current-setting resistor:

• 3A: Default

• 2A: Remove the current-setting resistor

• 1A: Replace the current-setting resistor with a 135kΩ resistor

Important

This charger is designed for one 3.7V nominal lithium-ion or lithium-polymer cell with a 4.2V maximum charging voltage.

For safe operation, ensure the battery is rated to accept the selected charging current. A battery with a maximum charge current below 3A should have the module configured to a lower charging current before use.