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Jun 14 '19 at 13:30 comment added Russell McMahon 1 ma x 24 hours x 365/3 days = 2920 mAh !!! before any motor etc drain. Your power budget needs better specification.|| What uC - data sheet link.please. 3.8V is a strange Vmax - sounds like a Vabsmax rating for a 3V3 device - which is not a valid design operating voltage.
Aug 16 '15 at 15:00 history edited juan jesus pinuaga CC BY-SA 3.0
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Aug 15 '15 at 4:05 answer mkeith timeline score: -1
Aug 15 '15 at 3:33 comment added mkeith Oh, if the average load is only 1mA, then you might be OK without the power path, or you could use a dual diode to power your LDO so that it will draw power from the DC power source when it is available (assuming it is greater than 4.2V), or switch over to battery automatically when the DC power source goes down.
Aug 15 '15 at 3:29 comment added mkeith You asked a lot of questions. I will weigh in on the interesting ones (to me). Use an LDO to drop the lithium battery voltage. The diode might not drop enough voltage to protect your uC, and at 1mA, a DC-DC converter will have a hard time competing with an LDO in efficiency. If you want to keep the Lithium battery charging, look for a charger with "power path" feature. Basically, this type of charger has three power connections. One for USB (or whatever) one for the battery, and one for system power. It manages all current flows intelligently just the way you want it to.
Aug 14 '15 at 18:38 answer stefandz timeline score: 1
Aug 14 '15 at 18:13 comment added MathieuL "The device needs to run 24/7 countinously forever," why not plug it into the wall?
Aug 14 '15 at 17:59 comment added juan jesus pinuaga My device is an addon for another battery powered device. I can't use their battery because the other device is crucial and i don't want to reduce his battery life. Also the voltage is higher and if i use it i have to go for a regualtor or a dc-dc converter.
Aug 14 '15 at 16:27 comment added stefandz Why would you run this off a battery if you have a motor power source close by?
Aug 14 '15 at 16:15 history asked juan jesus pinuaga CC BY-SA 3.0