If you need a pin-compatible second source, you will have to evaluate alternatives from the BQ24188 family or a different charger IC — the datasheet should be your guide for that comparison.
36-DSBGA package — field-swap realities
There is no visible pin-1 marker beyond the laser-marked dot on the top; orientation is critical and not obvious under a magnifier. Swapping this on site without a hot-air station and a microscope is not realistic — it is a lab-bench rework job. The I²C interface needs pull-up resistors sized for the bus capacitance — the charger itself does not include them.