Hello,
I have a MP2624. I would reach charge current at least at 3A at 5V. It seems the chip works only with an USB valid signal (so, not only +5V and GND). In this case, if I use a Micro o Mini USB connector, I have a maximum current of 1.8A, as from USB specifications. Question is: to reach high charge current, do I need to use only USB-C connector? Any suggestion to reach high charge current with mini or micro usb?
Thank you
Hello Luca,
This would really depend on your source and the AWG current rating of the cable that you have. Standard USB-C cables are able to provide a baseline of 3A given the slightly higher current of their typical applications.
If you really want to use a mini or micro-USB cable for the MP2624, then you would just need to make sure that your cable has the proper AWG rating for your desired current and that your source current is also aligned with this.
Best,
Krishan
You need to look at you own question… “The spec limits you to 1.8A” In most cases a standard USB connector will only deliver 0.5A, so even less. If you have a USB PSU which will deliver 3A, then you can get to 3A, but the PSU, connectors, cables etc will all have to be aligned. Also, you then couldn’t supply the unit without supplying all the in between bits. It would also be a non-standard USB and therefore couldn’t be certified.
On the other hand, if you used a USB-C with the power negotiator chip, you can run at a higher voltage, lower current and BUCK down. Then all USB-C Chargers will work (that deliver at least 15W), most cables will work and it can be certified.
Thank you @Krishan.FAE and @speacock.
I checked, I have a limitation to 1.2A due to PCB net dimensions. I have current situation:
1.PCB w/ Connector <—>2.Internal Cable <----> 3.Panel USB Connector on my device <----> 4.External USB cable <----> Wall adapter.
Let’s suppose I will fix hardware so from 1 to 3 so I can guarantee 3A. The MP2624 can receive max 7V of input voltage.
Questions are:
1 - Most usb charger have 5V or 9V of output. How can I reach high current having less current but higher voltage with this voltage limitation?
2 - Can I use NOT USB chargers? In this case I could use more chargers. Do I need USB lines to start the charging?
Thanks again
To answer your questions given your current configuration and supposing you fix hardware such that you can guarantee 3A:
Since the MP2624 has a max input of 7V, it is unable to support PD or QC adapters with 9V or 12V for a higher current, you would need to ensure that the cables and connectors are able to support increased amperage without significant losses and are operating within proper thermal limits at a 5V input.
It is possible to use a non-USB as long as they are able to provide a stable voltage that is also within the input voltage range and is able to supply a sufficient current as well. Charging without USB communication can be set with a fixed power supply so data line detection would just be skipped if this is not important for your application. Ensure that this supply doesn’t exceed 7V and provides your desired current.
Best,
Krishan