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18650 lithium battery charger based on IP2312

Overview

There are also chargers with the same functions based on IP5303/IP5305.
18650 lithium battery charger based on Yingjixin IP2312. Compared with the linear step-down TP4056, the IP2312 with synchronous switching step-down charging is more efficient and generates less heat.
The charger is designed for fixed 4.2V batteries.
The charger is equipped with a battery reverse connection protection circuit. When the battery is reversely connected, LED2 lights up, indicating that the battery is reversely connected incorrectly:

Advantages and Disadvantages:
Advantages: No heat at all Disadvantages: 1. The battery may be too old and the light will not turn on when fully charged;
2. Power on and The charging indicator LED1 is all flashing, and it is impossible to tell whether the battery is connected or not.
Notes on welding:

Finished product:

Design Files

MP4_20230605_215506VLOG.mp4

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-05-22 20:56:30

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