Electronics > Projects, Designs, and Technical Stuff
Dropping 100mV exactly
SiliconWizard:
That looked like it.
Finding an appropriate LDO is tough. I've found a few that meet some of your requirements (fixed 4.2V output, capless, low iq...) but never quite all. Some have higher iq than 50µA, some have higher max./ drop-out voltage than 100mV, and most of all - most won't fit your +/-20mV requirement... but you may eventually find something.
(Edit: example: LDCL015 from ST. Higher iq and voltage accuracy that's probably not good enough.)
One point that comes to mind here is the behavior of the charging circuit. I suppose you know how LiPo chargers work: constant current phase/constant voltage phase. Adding an LDO between the charger's output and the battery may confuse it in a couple of ways. That may be workable, but certainly something to consider IMO.
hli:
If you actually need a LiPo charger for a lower voltage, why not looking at LiPo charger circuits? Since you are worrying about voltage drop, maybe a LTC4071 can be an option? Its a shunt-based LiPo charger.
elektrinis:
The product already includes a fancy firmware-controlled charger, so adding one more on top would result in some unpredictable behavior. I have found an LDO with Iq below 1μA, will try that for now.
exe:
--- Quote from: elektrinis on March 12, 2019, 03:38:04 pm ---I have already found an ideal diode in sot23 package
--- End quote ---
Interesting, what was the part number?
elektrinis:
Ideal diode: MAX40200
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