Price drop due to the Samsung Galaxy S21 Series not including an AC Adapter. If you own a Note10 or S20 Samsung Device, you'd know that the option for compatible 45W Charger are limited due to PPS.
Packaging Contents: Wall Charger, Type-C to Type-C 5A Cable, User Manual
Output Voltage (Max, Normal Charge) - 5 V
Output Voltage (Max, Fast Charge) - PDO : 9V, 15V, 20V / PPS : 3.3-11.0V or 3.3-16.0V or 3.3-21.0V
Output Current (Max, Normal Charge) - 3 A
Output Current (Max, Fast Charge) - PDO : 3A(9V, 15V), 2.25A(20V) / PPS : 4.05A(3.3-11.0V) or 2.8A(3.3-16.0V) or 2.1A(3.3-21.0V)
From Android Central:
Why can't I just use any 45W Power Delivery charger with the S20 Ultra?
Samsung took several extra steps in the way it handles high-speed charging to prevent overheating and long-term battery damage. Unfortunately, those steps are a series of hoops that accessory makers and users like you and me have to jump through when we want to charge our S20 Ultra at top speeds. In order to get 45W charging, your setup needs to have the following:
A USB-C Power Delivery 3.0 charger that supports:
- PPS (Programmable Power Supply) — this is a subsection of Power Delivery 3.0, and there are few chargers out there to support it so far.
- 10V/4.5A charging speed
- PDO (Power Delivery Objects) — this negotiates the voltage/speed between the charger and the phone. It's what makes the difference between your S20 Ultra getting the more standard 10V/3A and 10V/4.5A from a charger.
An e-marked USB-C to USB-C cable
Because these specific requirements are only used by a handful of extra-expensive phones, accessory makers have had little reason to support this non-standard charging profile. You'll see a lot of chargers on Amazon that say they're PD 3.0 (PPS2.0), but they still don't support PDO or the 4.5A charging speed and thus, won't get full 45W charging.
PS: Apparently the Galaxy S21 Series doesn't support 45W Charging - Credits to Thunder-Wombat