MagSafe: why do we need a 20W AC charger?

With the announcement of the new iPhone 12 lineup, Apple has reintroduced a term that speaks to older people: MagSafe. Present on old MacBooks, the technology made it possible to magnetize the charger with the device, with the aim of a solid attachment, without the latter loose.

Unfortunately, MagSafe has disappeared for several years from our radars, giving way to more standard chargers, without any real explanation. Returning from the dead this year, technology now sticks our iPhones to wireless chargers, in particular thanks to special cases.

But, what is the story of MagSafe’s comeback? And why is it recommended to use a power of 20W?

apple magsafe charge mugshot

The MagSafe makes a comeback and calls for 20W

As Apple said during its presentation, the charging surface from which the firm has given birth can accommodate a power of “up to 15W”, but also to use the smartphone even with the charger in hand, thanks to magnetism. While Apple officially sells a homemade USB-C “fast charging” accessory, it’s also possible not to bet on the official accessory, since any USB-PD 3.0 charger with equivalent specifications will do.

USB PD (Power Delivery) is a technology allowing to manage a higher power on USB, and therefore to recharge a connected device more quickly. The standard offers several power profiles, ranging from 5 V to 20 V.

If the technology is interesting, it is because the latter has a much better understanding of the device to which it is connected, in particular its power requirements. But, by switching to version 3.0, the charger is also able to know more about the temperature and the malfunction of the charge, and therefore to send a certain power (reminder: 5 to 20 watts) depending on the behavior of the load. ‘apparatus.

You should know that the USB PD 3.0 specification was published in mid-2019 and therefore its deployment takes time, but yet this new charging technique meets the specifications of Apple and its homemade charger. We won’t go into details in this article, but thanks to its backward compatibility, USB PD 3.0 will still cap at 10W with older chargers.

To be more specific, Apple uses 9V and 2.2A for its MagSafe charger, which 20W or higher USB PD 3.0 adapters can offer. If you therefore want an alternative to the official accessory, it is therefore possible to turn to the 20W PD 3.0 adapters.

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