Teardown of Apple 40W Dynamic Power Adapter with 60W Max (A3365)
21 comments
·September 18, 2025rr808
BadBadJellyBean
It's up to the device. If I have an alarm for the morning my pixel 7 slow charges over the night so that it's full when the alarm goes off. Modern charging standards give all the control to the client device.
tialaramex
Is that with a dock, or without? My Pixel showed me a menu of choices for how to behave when first shown its wireless charging dock (charge to full ASAP, assume we'll need to be charged by alarm time, and some others) but I agree that a device can choose to do this from any power source, I don't feel like it gave the same choice when plugged in to a wall, maybe I'm wrong or it's in a menu somewhere.
analog31
The device being charged controls the charging current. Typically for smaller gadgets, a single resistor connected to the charge controller IC sets the current. Bigger things like laptops may be more sophisticated.
Reason077
Hopefully Apple releases a UK version of this adapter soon. The design looks very similar to my beloved Apple UK 20W charger [1]. I’d buy a 40-60W version in a heartbeat!
[1] https://www.amazon.co.uk/Apple-20W-USB-C-Power-Adapter/dp/B0...
umpalumpaaa
The pictures in the article are very nice and well done but I could not stop noticing the dirty yellow cable they used in some shots…
jnieminen
How does one distinguish between all the tiny devils in the details between all possible chargers to have the maximum efficiency in ones iPhone charging?
coder543
There really aren’t any nuances to be aware of here. If the charger can provide 45W or more, it will charge your iPhone 17 Pro as fast as it can go. If you have an older iPhone, you don’t even need that much.
The Apple charger is mildly interesting because they made a slightly smaller than usual one that displays a dynamic behavior where it boosts up to 60W. That’s it.
(If you actually mean efficiency of energy delivered, and not time efficiency… the energy efficiency of charging your own personal phone is completely irrelevant to anything. You could save many times that amount of energy per year by switching to a heat pump water heater, or a heat pump clothes dryer, but most people haven’t.)
sigmar
Looks very compact. "peak 60W, stable 40W" what length of time can it do 60W?
epistasis
From the article:
> The thermistor monitors the internal temperature and dynamically adjusts the power level to reduce output power when the temperature rises.
My guess is that it's dependent on the ambient temperature, but that's just a guess! I can't imagine what the restriction on peak power would be other than temperature rise, though...
brandall10
I have a generic slim GAN charger that does a similar stepdown, 65W -> 45W. Different form factor, but same 80g weight.
Peak power tends to last about 10 minutes or so.
mikepurvis
I bet their telemetry shows that a lot of people grab a quick charge while in the shower or the like, and that 10mins is a good amount of time for that.
Or put another way, past ten mins it’s just as likely the phone will be plugged in for hours or overnight and the charge speed is irrelevant.
okasaki
There doesn't really seem to be anything interesting about this.
Also while the US plug makes some pretty compact power adapters, the effect is largely ruined in the EU and UK with their wider more cumbersome plugs.
Lio
Apple make an excellent UK 20W charger with folding pins.
Physically the design is pretty much the same as this new 60/40W version, so I would expect them to eventually offer a 60/40W folding pin UK charger too.
https://www.apple.com/uk/shop/product/MUVT3B/A/20w-usb-c-pow...
torgoguys
> There doesn't really seem to be anything interesting about this.
Agreed. Seriously, am I missing something or are the compact chargers from various other companies at least as compelling as this? I've got a nice one from Lenovo with high output and a smaller form factor than this. (Several other manufacturers have a similar size and output so nothing special about Lenovo here). The Apple one, while maybe smaller then their usual, is still bigger and appears to be short and "fat" which can limit where you can plug it sometimes.
Or is just another "but this time it is from Apple" kind of thing. (All the vapor chamber talk from a few days ago had me scratching my head too.)
ridiculous_fish
What's interesting about it is that it supports SPR AVS, which is a new USB power delivery spec. I'm not aware of any other chargers that support this.
https://www.chargerlab.com/complete-pd-3-2-spr-avs-specifica...
nicoburns
A lot support PPS, which seems like it offers a superset of SPR AVS's functionality? http://spravs.com/iphone-17-spr-avs-vs-pps
wooptoo
Site seems to be down?
garrettgrimsley
It eventually loaded for me. Alternatively: https://archive.is/tOC9a
1oooqooq
i was already sad the link wasn't righto.com when it's about chargers, and then it completely disappointed by not loading :)
and it's barely past 10 votes.
Teknomadix
GaN in action!
Is there a way to slow down these high power chargers? Sometimes I want a fast charge but mostly I want slow to getting hot. I realize overnight charging phones are smart enough to do this but otherwise seems to be impossible without having two different chargers.