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TPS613221AEVM: When TPS613221A start to work,button cell voltage will drop dowm more

Part Number: TPS613221AEVM

Customer have an problem that test the TPS613221AEVM.They found the TPS613221AEVM when TPS613221A start to work,the button cell voltage will drop  dowm more.Normal button cell voltage is 3.0V,and use awhile the voltage will drop  dowm 2.8V.But the test situation is if TPS613221A start to work,the  voltage will drop  dowm to 2.5V quickly.

Can we help to explain this problem and solve this issue.Thanks.