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MMPF0100F3AEP Power up issue

Question asked by MUTHU NAGARAJAN on Oct 30, 2014
Latest reply on Nov 4, 2014 by igorpadykov

I'm seeing a power up issue with the MMPF0100F3AEP PMIC where on ramping Vin > UVDET the SNVS voltage will only power-up to ~0.83V and stay there. This causes all the regulators in the PMIC to not start-up.

In our application we turn ON and OFF the Vin input to the PMIC and I ensured that the Vin voltage discharges to well below the falling UVDET threshold before powering it back again.

The LICELL input is floating other than the recommended bypass capacitor. Any idea why SNVS won't power up to its normal voltage of 3V?

 

Looking at the State diagram, it looks like the PMIC goes to the Coin cell state when Vin falls below UVDET, and the next time I apply power Vin > UVDET it is

going into OFF state. How do I get it to transition to the ON state?

 

Thanks

Muthu

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