Using 9V batteries to generate 3.3V / 300mA with a LDO.... is wasting about 60% of battery poweri want to use these phone type batteries and get 3.3v 300mA , any recommendations for battery that has higher voltage than 3.3v since i will be using a LDO to get 3.3v regulated output.
I hope you didn't buy a fake Chinese 18650 battery cell from ebay:
https://www.youtube.com/watch?v=eOshOXcSkDA
The LP2951 is a voltage regulator not a Li-Ion battery charger. It will overcharge a Li-Ion battery cell and possibly cause it to catch on fire. Please post the link of the article you found.
Hi,
In the given document the LP2951 is used as charging IC. Have you noticed the dedicated LiIon charger IC LM3420?
You came to TI.
Did you use their selection guide?
**broken link removed**
Klaus
www.batteryuniversity.com says to terminate the charge when the charging current becomes <3% of the rated current. The TI circuit does not terminate the charge because their voltage regulator is not detecting a full charge.how can texas instrument come up with such a circuit for LiIon battery ? here is the link to their document
https://www.ti.com/lit/an/snva557/snva557.pdf
No, I don't know your charging current and input voltage...1- you recommending to use LM3420 instead of LP2951 but LP2951 will still work as per TI design?
Then - with the knowledge of charging technology - decide what charging current and input voltage you need. Find a suitable adapter.
......
There are many IC manufacturers for charging circuits. Usually they have interactive selection guides to find the best IC for your specifications.
Read datasheets of the IC and related application notes.
if you use a real 18650 cell not a fake one and it has a true capacity of 2600mAh then it will produce 3.2V to 4.2V for about 5.2 hours when its load is 500mA. But the buck regulator will not provide 500mA when its input voltage drops below 4.3V. A graph on the regulator datasheet shows an output of only about 250mA when the battery is half discharged to 3.7V and almost no output current when the battery voltage is near 3.3V.
Two 18650 cells in series produce a minimum of 6.4V which will be good to feed the buck regulator.
I think it's the schematic of page111.2 Layout Example is for which circuit?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?