What happens when the battery is fully charged and I leave the USB connected? Do I need to connect a fet to pull high and low to the program pin or?
@visalatchikumar
4 ай бұрын
Application is charging a 3.7 volts lithium polymer battery.
@PCBurn
4 ай бұрын
You'll have to familiarize yourself with the datasheet www.analog.com/en/products/ltc4054-4.2.html If the technical details are unfamiliar you will want to consult an engineer with your specific application.
@visalatchikumar
4 ай бұрын
Okay Thank you
@leehaijian6743
3 жыл бұрын
Does this chip supports using the battery while it is charging the battery? For example, like a smartphone which u can still use the phone while its still charging at the same time.
@PCBurn
3 жыл бұрын
For that you'd want a charge circuit with pass-through. One that'd decouple the battery charging and batter itself from powering the circuit when plugged in. Cell phones tend to use a tiny BGA chip such as Monolithic's MP2690. That'd offer more features than you're strictly looking for. You could also design an external circuit that takes the battery out of the loop when the USB or other charge circuit is plugged in. I couldn't find a quick reference for you on that but I'm sure someone's posted one. Just make sure whatever you find is functional. The problem you're solving in either case is that the charge circuit won't cut out appropriately when the battery gets fully charged if you just wire it all together and the battery and charger are under constant load/drain. Good luck!
@leehaijian6743
3 жыл бұрын
Thank you very much☺️
@JernD
3 жыл бұрын
What is the benefit of this over the super cheap TP4056 boards that are preassembled with usb port?
@PCBurn
3 жыл бұрын
My reason for researching the chip was the LIR2032 I'm using there. Random TP4056 ICs from EBay that I received didn't correctly adjust their mA output based on the resistor and tried pushing 100's of mAs with the correct programming resistor. The parts I picked up listed as LTC4054ES5 at least conform enough to function set at 18mA. The LTC4054 will also handle 800mAh with proper PCB heatsinking. A real TP4056 (and most of the TP405x family) is rated for 600mAh max per Top Power's data sheets. That being said this circuit'll work for either the LTC part or it's (pin matching) clones. Providing a USB board has a part that works it might be the exact same design on a PCB. During a bit of research I've also seen a number of TP405x chips being labeled up front as product from companies other than Top Power (that's the TP in TP4056) and sold for absurdly low prices... less than a decent SMD passive component. I might revisit the circuit with the not-quite grain-of-sand cheap TP4058 drop in replacement for the LTC4054.
@JernD
3 жыл бұрын
@@PCBurn ah ok that makes sense, I haven't tried to alter the cheap boards charging rate, although I do know their cutout voltages are often too high. Thanks for the response!
@PCBurn
3 жыл бұрын
Oh, late follow up, but I should have a pair of TP40xx chips on an upcoming component video (probably in a month). I just received two rolls of the TP4057 and TP4059 from LCSC. Which should be "real" parts from TP rather than a different fabricator's clone. One's a drop in replacement for the circuit here and the other has some more advanced features built in.
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