On Tue, Feb 8, 2011 at 1:21 AM, RussellMc wrote: >> Does anyone make an LDO with low-voltage cutoff? Parametric searches >> and Google seem to be failing me. > > > If you can't find an all in one solution: > > Some=A0regulators have shutdown pins. Shutting down the regulator when > Vout OR Vin got too low would work. > > This may be able to be just 2 x r plus a bipolar. > Almost certainly precise enough for this task. > Check at desired temperature extremes. > 3 small components. > > Or a power supply monitor IC driving shutdown. > Possibly 1 small (3 pin) device. > > Or 2 x R and a TLV431 or TL431. Or (extra points) a bipolar and 2 r's > connected to shut down when Vdropout got too low. (Noting =A0that > Vdropout MAY increase in dropout with some ICs). > Since the point is to stop draining the battery when the voltage gets low, any solution with high quiescent current in "off" mode is out. A three-terminal supervisor and LDO with enable pin will do the job I think. Hopefully the supervisor will have enough hysteresis to keep from oscillating the power on the way down. Microchip has two pages of single-cell Li-Ion linear charge regulators, but users are left to roll their own low-voltage cutoff? Am I missing something? Regards, Mark markarges@gmail --=20 Mark Rages, Engineer Midwest Telecine LLC markrages@midwesttelecine.com --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .