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TLV757P: Observed 0.3mA quiescent current across input side of TLV75718PDBVR LDO

Hebbar Sudarshan
Prodigy 40 points
Part Number: TLV757P

Tool/software:

Dear Team,

We are using TLV75718PDBVR TI part as our 1V8 LDO in our design .The input voltage for the circuit is around 3.7V to 4.2V(max) and for the 3.7V we are observing around 1.1mA current at the input of the LDO with the LDO output current around 0.8mA.

So there is 0.3mA difference in input current when compared with output current. We suspect that LDO  is consuming 0.3mA quiescent current, Kindly provide your input on mentioned observations.

Reference schematic:

Below are the query based on our understanding from the TLV75718PDBVR datasheet.

1. In the datasheet section 5.6 it is mentioned Input voltage vs Quiescent current behaviour. The behaviour is only mentioned for Vout = 3.3V, Let me know what will be the behaviour of quiescent current for 1.8V output voltage?

2.And could you please provide inputs on the difference between GND Pin Current and Quiescent current? As the both behaviours are mentioned differently verses input voltage.

Regards,

Hebbar Sudarshan