Anyone know how to adjust this regulator to 3.3v from input battery (4.2v charged 3.7v discharged), do I need a set of resistors? If so what impedance?
Read the datasheet carefully, the regulator has typically 1.2V dropout voltage, so to get stable 3.3V you need at least 4.5V input.Anyone know how to adjust this regulator to 3.3v from input battery (4.2v charged 3.7v discharged), do I need a set of resistors? If so what impedance?
Again please? Are you trying to get 3.7V out of the regulator, or are you trying to get 3.3V from a lithium battery?Mm it has a standard product (not adjustable) of 3.3v -the data sheet says this is achievedby internal resistors...so because this was all that the shop had in stock I assumed this would do it..
I added some resistors but all I get is a differential of 0.4xxx volts no matter what the input voltage is...
The product is probably right, I am Probably doing something wrong...
3.3v out of the regulator... Can u tell me why it would be impossible (for my own interest)Again please? Are you trying to get 3.7V out of the regulator, or are you trying to get 3.3V from a lithium battery?
The first is possible if you connect the ground pin through a diode or a small resistor, the second is impossible.
Extrapolating from the maximum data sheet dropout values I estimate the LM3940 should work down to 3.7V input if the current is not more than 330mA.Will the LM give me a stable 3.3v through the batteries ie fripom 4.2 volts drained to 3.7v input?
by Jake Hertz
by Aaron Carman
by Aaron Carman
by Aaron Carman