Hi, I need to power a 5v ht1621 LCD from 4*AA batteries. This works directly from the ~6 battery supply but the circuit also has a l293dd driven stepper motor which when turned on, dimms the lcd. This is all controlled by a pic16f1847 which uses a 3.33v 1117 LDO regulator.
The PIC can work from 5v so I thought I would replace the 3.3v LOD with a 5v one.
However
From what I understand, a 5v output LDO requires an input of 5v + dropout voltage. This fits within 6v from the batteries but what about when the batteries are a bit drained, say outputting 4v. will it still work?
Also if you look at this one from Farnell, it specs a min input voltage of 2.6v. So will it output 5v if it's input voltage is say 3v? http://uk.farnell.com/texas-instruments/lm1117mp-5-0/ldo-0-8a-5v-sot-223/dp/9778209
Are there alternatives?
Thanks in advance, I have found this forum so very useful in the past year!
The PIC can work from 5v so I thought I would replace the 3.3v LOD with a 5v one.
However
From what I understand, a 5v output LDO requires an input of 5v + dropout voltage. This fits within 6v from the batteries but what about when the batteries are a bit drained, say outputting 4v. will it still work?
Also if you look at this one from Farnell, it specs a min input voltage of 2.6v. So will it output 5v if it's input voltage is say 3v? http://uk.farnell.com/texas-instruments/lm1117mp-5-0/ldo-0-8a-5v-sot-223/dp/9778209
Are there alternatives?
Thanks in advance, I have found this forum so very useful in the past year!