Part Number: TPS7B86-Q1
Tool/software:
Hi Team
Does it have an anti-saturation circuit? If not, then it may consume a lot of current when input voltage is low, e.g. during start-up. How much bias current does the regulator consume during drop-out, e.g. with the lowest input voltage (worst case input voltage)?
Best
Khai
Hi Khai,
We've actually measured quiescent current in dropout for the Vout=5 case (see IQ spike below 5Vin):
You are correct, it draws a lot more current in dropout, peaking at ~160uA.
Startup current is usually pretty large due to a different phenomenon (instantaneous peak at ~750mA):
Essentially charging up the capacitors draws a large initial current and there's a short period of time in startup where the internal current limit hasn't fully turned on, allowing the device to briefly draw more current than it would be able to in proper regulation.
Best,
Gregory Thompson
