PMIC PF3000 minimum input for VSNVS on

[frankyhsu]

Hi

We are checking the PMIC minimum vin and we found when we set Vin=2.8V, the VSNVS output will be off. We have checked the PF3000 EVB and got the same symptom. In the datasheet, the minimum Vin should be 2.25V. Why is the VSNVS turned off @Vin=2.8V? 

[igorpadykov · Accepted solution]

Hi Franky

VSNVS output derives its power from either VIN using LDO, or coin cell.

LDO is used wnen VIN > VTH1 as described in sect.6.3.11 VSNVS LDO/switch,

Table 67. SNVS modes of operation, VTH1=2.75V (typ.), Table 16. Dynamic electrical

characteristics - VSNVS PF3000 Datasheet
https://www.nxp.com/docs/en/data-sheet/PF3000.pdf 

When powered by coin cell, the VSNVS output tracks the coin cell voltage by means of a switch.

Best regards
igor
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