Wattage · PPS and the handheld class
45W adapters: 20V at 2.25 amps, and the PPS gate.
45W is the first wattage that covers gaming handhelds, ultraportable laptops and Samsung's fastest phone charging in one brick — but only if it carries the right PPS range. Watts alone do not unlock Super Fast Charging 2.0.
The profile set that matters
A properly specified 45W USB-C adapter publishes four fixed rails plus a programmable range:
| Profile | Power | Used by |
|---|---|---|
| 5V / 3A | 15W | Accessories and non-PD devices |
| 9V / 3A | 27W | Phones at peak |
| 15V / 3A | 45W | Nintendo Switch docks (39W at 15V/2.6A), some hubs |
| 20V / 2.25A | 45W | Ultraportable laptops, Steam Deck |
| PPS 3.3–11V / 4.05A | up to 45W | Galaxy S Ultra and Tab S Ultra, Super Fast Charging 2.0 |
Drop the PPS line and the adapter is still a fine 45W laptop supply — but a Galaxy S Ultra plugged into it falls back to a fixed rail and charges at roughly 25W. That single missing profile is the most common reason someone buys "a 45W Samsung charger" and sees no change. Mechanism: PPS explained.
Devices that land exactly here
Steam Deck ships with a 45W USB-C supply and draws close to it while charging under load. Nintendo Switch asks for 15V/2.6A — 39W — so a 45W adapter with a real 15V rail covers dock duty with margin. Galaxy S Ultra and Tab S Ultra reach their 45W maximum only over PPS. Dell, Lenovo and HP ultraportables in the 13-inch class are frequently specified at 45W over USB-C, and a MacBook Air charges comfortably. The device-side detail is on chargers for the Steam Deck and the Samsung 45W adapter page.
Picks at this wattage
- 45W
Samsung 45W USB-C Wall Charger
The reference part for Super Fast Charging 2.0: it publishes the PPS range an S Ultra needs, which generic 45W bricks often omit.
- Output
- 45W PD + PPS
- Port
- 1× USB-C
- Trigger
- SFC 2.0
- 45W
45W-class GaN charger with PPS
Class pick for a mixed household. Confirm the printed PPS range reaches roughly 11V and 4A or better, or an Ultra will not hit 45W.
- Output
- 45W with PPS
- Port
- 1× USB-C
- Look for
- PPS range printed
- 2-port
45W dual-port travel charger
Class pick for one-socket travel. Full 45W on port one when it is alone; expect roughly 30W + 15W when both ports are loaded.
- Output
- 45W total
- Ports
- 2× USB-C
- Caveat
- Splits when shared
When 45W is overkill, and when to size up
It is overkill for a phone-only life: an iPhone caps in the low-to-mid 20s and a base Galaxy at 25W, so 30W or 35W saves money and bulk. It is also more than a Xiaomi-family 33W phone can use, since that tier relies on a vendor rail rather than watts. Size up to 65W if you own a MacBook Air you want to fast-charge or a 14-inch laptop, which is the point where one brick can genuinely replace all the others — see 45W vs 65W. The general rule from can I use a higher-wattage charger applies throughout: the device asks, the adapter answers, and unused watts cost nothing but shelf space.
FAQ
Why is my Galaxy S Ultra not charging at 45W?
Almost always a missing PPS profile. Super Fast Charging 2.0 needs a programmable range near 11V at about 4A; a 45W adapter with fixed rails only will run the phone at roughly 25W.
Is 45W enough for a laptop?
For a 13-inch ultraportable or a MacBook Air, yes. Pro-class 14-inch and 16-inch laptops start at 67W and 140W respectively and will charge slowly or only while asleep on 45W.
Does a 45W adapter work with a Nintendo Switch dock?
Yes, provided it offers a 15V rail. The dock requests 15V at 2.6A, which is 39W, so a 45W adapter with the standard 15V/3A profile covers it with headroom.