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TIDA-00484: Coin cell battery discharge when VBATT become low

Part Number: TIDA-00484
Other Parts Discussed in Thread: TPL5111, TPS3839

Hello experts,

My customer shows interest in this design. And I got question about this design from customer.

1. When coin cell battery's voltage(VBATT)  become low (e.g. 2.0V, end voltage), TPL5111 open the load switch to drive MCU.

    But, MCU needs some current to drive itself. In this case, VBATT drop. So, MCU can't drive

2. After turn off the load switch, VBATT recover because the load is light compared with driving MCU.

    After recovering VBATT, this TPL5111 open the load switch to drive MCU.

    But, same thing will occur (can't drive MCU, and turn off load switch)

My customer confirmed this phenomenon loop.

This phenomenon will lead over discharge of battery. It is dangerous.

Is there good solution to solve this loop?

Thanks and best regards,

Ryo Akashi