HT2810AREZ Verification Board - Aluminum Substrate

I. Design Considerations
: 1. To reduce high-frequency noise, connect a 100nF ceramic capacitor to each input and output pin.
2. Connect a small resistor in series between the input power supply and the chip's VCC pin for power dissipation and to help the charging chip share heat. The resistance should be 0.2-0.5A. In the aluminum substrate version, it can be directly shorted.
3. The chip can withstand a 24V input voltage without damage, but it will not work. If the voltage in the application may be higher, ensure that the input capacitor's withstand voltage exceeds this voltage.
4. When the NTC function is not in use, leave the TEMP pin floating or grounded.
5. The input pin VCC needs to be pulled down to ground with a 1K resistor for voltage discharge after power failure. Failure to connect the indicator light may cause abnormalities.
6. Avoid using this chip in charging applications with high-capacity lithium batteries.
II. Test Data
1. Charging Process: Initial battery voltage 2.89V, charging current 0.997A (Rprog resistor is 1K), fully charged voltage 4.2005V (after 30 minutes of rest after full charge);
2. Temperature: After 10 minutes of constant current, the measured temperature was 48.8℃ on the top surface and 35.8℃ on the bottom surface, with a room temperature of 14℃. The board temperature was evenly distributed;
3. Static Current: 0.33uA (after removing the charger after full charge);
4. Overvoltage Protection: The chip output was abnormal when the voltage exceeded 6.6V, and returned to normal after dropping to 6.4V.
III. Untested Items
1. Charging and discharging conditions when the charging board is simultaneously connected to a battery and a load.
IV. Other
1. The aluminum substrate dissipates heat quickly, so a hot air gun can be used during soldering. Use a soldering iron tip with a high heat capacity.
2. The four screw holes on the board can be deleted to reduce the board area. In this version, the screw holes are connected to the negative terminal of the battery. If you do not want to connect them, you can modify them to non-mechanical vias.
3. The board components are relatively simple. To maintain simplicity, the reference designators have been deleted for the small board. You can use the LCSC EDA Professional Edition soldering tool during soldering.