Features / Specs
- Control Chip: INJOINIC IP2312
- Input Voltage Range: 4.5 – 5.5VDC (Applying more than 5.5V may damage the IC)
- Compatible Battery Type: 3.7V Lithium-ion (Li-ion) and Lithium Polymer (LiPo)
- Charge Cut-Off Voltage: 4.2V / 4.35V (Selectable via SMD jumper)
- Max Charge Current: 3A (Adjustable via SMD resistor)
- Conversion Efficiency: 3A @ 93% / 2A @ 94% / 1A @ 95%
- Indication LEDs: Red power LED / Blue charge complete LED
- Protection: No fault indication LED. No onboard battery protection circuitry.
- Dimensions: ~(34.5mm x 15mm x 4.8mm)
Operation Overview
- If the connected battery voltage is below 3.0V, the charger provides a 100mA trickle charge until the battery reaches 3.0V
- Once the battery reaches 3.0V, the charger switches to CC (Constant Current) mode and charges at the preset current limit
- Refer to the product image for the current-setting resistor location. Default (47kΩ) – 3A; open circuit – 2.1A; 135kΩ – 1A
- Constant Current mode continues until the battery voltage approaches 4.2V and the charge current drops to approximately 300mA. The charger then switches to CV (Constant Voltage) mode
- In CV mode, charging pauses every 4 minutes to check whether the battery voltage exceeds 4.15V. If the battery is full, charging stops. If not, charging resumes for another 4 minutes before checking again.
- After full charge is detected, charging will resume only if the battery voltage drops below 4.1V