IP2326_2S_3S Charging Manager

Description:
This is a lithium battery charging manager based on IP2326. The maximum charging power is 12W for 2 seconds and 15W for 3 seconds.
The input is USB_C. For maximum charging efficiency, it is recommended to use a QC-compatible charger. IP2326 can request fast charging voltage from the input via DP/DM based on the current battery voltage.
The output uses an HX 2.54-4P connector, consisting of battery +, battery -, and an NTC resistor (optional).
 
Instructions for use:
1. Before powering on, set the number of battery cells (****Important****) and the charging current. DIP switches 1 and 2 are used to set the charging current: both 0, 0.5A; one 1, 1A; both 1, 1.5A. DIP switch 3 is used to set the number of battery cells: 0 for 2 seconds, 1 for 3 seconds.
2. If using an NTC charger, attach the NTC to the battery, connect the battery, and then connect the USB_C input.
3. During charging, the CHG indicator light will illuminate. If the battery voltage is too low, the CC indicator light will not illuminate, indicating trickle charging. Once a certain voltage is reached, the CC indicator light will illuminate, indicating constant current charging. The charging current will be the current set above.
4. The CHG indicator light will turn off when fully charged. The CHG indicator light will flash when an abnormality is detected.
5. Charging output will automatically shut off if the charging time exceeds 12 hours.
Soldering Instructions:
1. Do not solder anything marked NC on the board.
2. Use an RNTC=100K thermistor (B=4100) for the NTC resistor. Simultaneously, solder an 82K parallel resistor onto the TBD resistor. C12 can be 1-100nF or omitted.
3. If not using an NTC resistor, solder a 51K resistor onto the TBD resistor; otherwise, malfunction will occur.
4. For beginners, it is recommended to solder the IP2326 and USB first, then other resistors and capacitors, then the inductor, and finally the DIP switch and output socket.
5. The 2.54mm header pins are mainly for convenient MCU monitoring of input and output voltages, NTC temperature, and charging indicators when out in use. If not needed, soldering is unnecessary and will not affect operation.
 
Additional note:
Actual measured charging current at 1A resulted in a maximum chip temperature of approximately 43 degrees Celsius – quite cool!
Precautions:
**************For safety, lithium battery charging must be supervised! ****************
**************Do not charge the battery unattended! ****************