Dear TI Team,
We are using TPS62842 buck converter and our setup is following:
V input = 4.2V
Rset = 52.3k (Desired Vout = 3.3V)
MODE Pin -> Connected to GND ( Low power mode)
EN Pin -> Connected to HIGH (Enable device operation)
In the device datasheet, it is written that device has 60nA operating quiescent current. When we tested the buck converter with 4.2V input from power supply and zero load, we measured around 15uA current consumption, compared to expected 0.06uA.
I don't know if it has an effect, but in the datasheet it is written that EN pin has internal 450k pull-down. With 4.2V supply, I = V/R ~9uA. Is it the reason for increased consumption?
Also wanted to note an observation: we are using recommended inductor that is mentioned in the datasheet. When we change inductor to another 2.2uH model, the consumption fell to 8uA instead of previous 15uA. Is it normal?