https://www.androidauthority.com/fast-charging-explained-889780/

> Fast charging at high voltage?
section explains that it does step down the voltage to increase the current

you can't increase voltage, it's not safe

```The diagram above shows how MediaTek’s PumpExpress 3.0 and 4.0 manage to reach up to 5A of charging current. If a 5A cable is connected, its technology bypasses the conventional switching charger to enable a higher current. In this case, the circuit negotiates the required voltage over the data lines, raising and lowering the Vbus charging voltage for maximum efficiency.```
i could fucking write a report on this

you can't increase current, it's limited by the batteries internal resistance and safety

all of these sources show that phones that support quick charging have batteries that support higher currents aswell

yes, that's the power going into the phone, and it slightly increases charging current for the battery

it increases it quite a lot

in that one case up to 5A

that's what's going into the phone

pre losses

- what the phone is actually drawing

in order for quick charge to charge a battery faster more power has to enter the battery. power can only exist as voltage and current. we've established that batteries are charged at a very specific voltage and that the current the battery sees varies with respect to the battery voltage

https://cdn57.androidauthority.net/wp-content/uploads/2018/07/Battery-Charge-Voltage-vs-Time.png

batteries are not charged at a specific voltage

it depends how discharged they are

the more discharged a battery is, the more current it wants to draw and it's limited by lowering the voltage

as it gets charged the voltage climbs to ~4.2V and current drops

yessss

it's still wrong of linus to say you're charging at 14.5V

you're not

its technically correct if you only consider the power going into the *phone* since thats how the quick charge standard works

let me look at the links you posted

the first one has nothing to do with charging

that's a datasheet for a quickcharge controller

it only negotiates power with a quickcharge charger

you could hook it up to fan for all it cares

i did see a variable powersupply build based on it or something like it

but yeah thats what makes it technically correct

the battery seees something different but the phone sees voltages according the quickcharge standard or whatever its using

the phone's charging port sees *

if you take apart the phone and plug it in and poke the charging port pin with a multimeter and it has successfully negotiated a higher voltage from the charger then the meter should show a higher voltage across the d+ and d- pins

the d+ and d- pins are data pins

wait yeah i forgot

the standard raises the vbus pin

d+ and d- never go higher than 3.3v

Fuckin nerds

you can keep posting diagrams and shit about power delivery

but i'm not arguing with you on that

that's all correct