[5V input] Boost charging, can charge two series lithium batteries (8.4V) circuit

characteristic:

    USB 5V input asynchronous switch boost charging.
    The operating voltage is 3.5~18V, the internal integrated high-voltage transistor has a maximum charging current of 1.5A, and the charging current is adjustable by an external resistor.
    NTC function.
    Boost charging efficiency is 90%.
    The automatic power balancing function can automatically adjust the input current for charging series batteries separately, matching all adapters.
    Supports LED charging status indication.
    Built-in power MOS.
    500KHz switching frequency, can support 2.2uH inductor.
    Output overvoltage, short circuit protection.
    Input undervoltage and overvoltage protection .
    IC over temperature protection.
    ESD 4K

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Input voltage 5V:

When the battery voltage is too low - larger current charging:

When the battery voltage is medium - current sharing charging:

When the battery voltage is fully charged - protection:

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The charging process
    CS5090E adopts a complete CC/CV charging mode.

    1. When the voltage of the double-cell lithium battery is less than 2V, the system charges the battery at 1/20 lcc.

    2. When the voltage of the double-cell lithium battery is greater than 2V and less than 5.6V, the system charges the battery at 1/10 Icc.

    3. When the voltage of the double-cell lithium battery is greater than 5.6V, the system enters constant current charging mode.

    4. When the battery voltage is close to 8.4V, the system enters constant voltage mode. After entering constant voltage mode, if the charging current is less than 100mA, the system will stop charging.

    5. When the battery is fully charged, if the battery voltage drops below 8.2V, the system will restart to charge the battery.

Protection function
    CS5090E has complete battery charging protection function.

    1. When the chip experiences overvoltage at the input end, overvoltage at the output end, or overtemperature, the boost charging function will be turned off immediately.

    2. When the battery voltage is lower than VsHORT, the output undervoltage protection function is turned on, the main power tube is turned off first, and the block tube will enter linear mode and charge the battery with a charging current of 1/20 lcc.

    3. When the battery voltage is higher than VsHORT, the output short circuit protection function is turned off.

Adaptive input current limiting function
    CS5090E has a built-in special loop that can automatically adjust the charging current to protect the input DC power supply from entering an overdrive state. Because a large charging current will cause the input power supply voltage to drop, as the power supply voltage drops, the input terminal of the internal adaptive loop op amp also drops. When it is reduced to the internal reference value, the built-in adaptive loop automatically adjusts the system duty cycle to reduce the charging current to reduce the driving pressure of the input power supply, so that the output voltage is fixed at 4.5V.

Charging LED indication
    1. Always on during charging and off after charging.
    2. When input overvoltage, output undervoltage or overvoltage occurs, the NTC port detects abnormal battery temperature, output short circuit, charging time times out or chip overtemperature, it will flash at a frequency of 1.6Hz.

BOM table

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There is a lot of information, you can see the link below

Information article link:

https://blog.csdn.net/qq_51272949/article/details/124779108?spm=1001.2014.3001.5501