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about BQ24013

Sung-Jun Kim
Prodigy 20 points
Other Parts Discussed in Thread: TPS62130

 - BATT Out  is connected Li-Ion batt (3.7V) and regurator(LTC3442) for microcontroller

Input Voltage 5.0~5.1V ->everything is ok (OUT voltage are just above the battery voltage)

But Input Voltage more than 5.5V -> OUT Voltage going to 4.2V -> can't charging battery.

thank you for reading

  • 0
    TI__Mastermind 36110 points

    There are several things that could cause your circuit to not work properly.  First check all voltages at the IC to make sure you have good solder connections.  Note that the charger will not charge if the battery voltage does not drop below the recharge threshold.  Be sure to monitor the STAT1 and STAT2 pins to understand what state the charger is in.  It will be a good idea for you to review the datasheet for proper component design and selection.  If R14 is really a 120ohm resistor, it is much too small.  You should limit the charging current to less than 1A. 

    Just an FYI that I think you will get much better performance using the TPS62130 for your buck converter.  It has excellent performance and only has much fewer external components that the IC you use right now.  Be sure to copy the EVM layout to ensure good layout and performance.

  • 0 in reply to Matthew Day
    Prodigy 20 points

    Thank you reply.

    R14 is my misstake. R14 is 1.2k ohm.