Sandman
In article <98j1t99j3ldkgr76ghuvk5bedso6kt854r@4ax.com>, Eric Stevens wrote:

Tony Cooper
Wait a minute! You've said in another post that people call them different things, and that's OK. So if that's OK, then calling the power adapter a "battery charger" is perfectly legitimate by your rules. If it's used to charge the battery, calling it a "battery charger" is logical.

Sandman
It's not a battery charger, regardless of what people call it.

Eric Stevens
My iPad battery is down to 8%.

What can I do to charge it?

Sandman
It won't fit in a battery charger, so you'd better plug in the adapter plug that connects the PMIC to your wall socket which in turn powers your iPad while also charging the battery.

How many days will you argue about this this time?

The USB brick is a power adaptor. It takes the power from your wall socket as input and provides a 5 or 10 volt output to the device. This is not a power supply unit either.

The battery is not a PSU either, the PMIC (power management integrated circuit) chip in the iPad is a the PSU. It takes the power from either the battery *or* the power adapter and provides electrical current to the load (i.e. the iPad).

Wall Socket ->Adapter ->Lightning port ->PMIC ->Motherboard Battery ->PMIC ->Motherboard

Few would call a PMIC a PSU, but it's as close as a PSU you could get to in a mobile device. It's the chip that takes the input power from an energy source (wall socket, battery) and delivers it through a power output to the load.

Eric Stevens
The Qualcomm PM8028 (PMIC) does not supply power and hence cannot be called a Power Supply Unit.

Sandman
That's exactly what it does and exactly what it is called. You can buy it directly from Amazon:

<http://www.amazon.ca/iPhone-Small-Supply-Qualcomm-PM8028/dp/B009F3SDI4>

Eric Stevens
It is basically a switch and decides whether power to iPhone'e operative circuits will be supplied from the battery or the external power adaptor, assuming one is in use.

Sandman
It does a whole lot more than that. It monitors the battery charge, determining whether it needs charging. It manages all power in the unit.

Eric Stevens
In the absence of a power adaptor the iPhone draws power from the battery and the PM2028 serves no function.

Sandman
Incorrect, both PMIC's (Qualcomm and Dialog) have several functions with regards to use of and management of power regardless of power source, such as voltage scaling/regulation and power sequencing, many of which is a lot more important functions when running on battery power since power needs to be managed a lot more carefully then - plus power efficiency is of great importance.

The PMIC's has fewer functions when plugged in to the wall than when not, actually.