ZHCSHK8B October 2017 – October 2018 TAS2770
Good quality decoupling capacitors should be added at each of the VBAT input to provide good reliability, good audio performance, and to meet regulatory requirements. X5R or better ratings should be used in this application. Consider temperature, ripple current, and voltage overshoots when selecting decoupling capacitors.
Also, the decoupling capacitors should be located near the VBAT and GND connections to the device to minimize series inductances.