You bought a 45W charger for your new phone, plugged it in, and it charges no faster than the old one. The charger isn’t faulty and your phone isn’t broken — they simply don’t speak the same language. The missing piece has an unglamorous name almost no box mentions: PPS. It’s the reason two chargers labeled “45W” can give wildly different results, and it’s one of the most misunderstood things in phone charging.
PPS (Programmable Power Supply) lets your phone and charger negotiate the exact voltage in real time, which is what unlocks the fastest, coolest charging on modern phones — especially Samsung Galaxy. A “45W” or generic “PD” charger without PPS can quietly drop a recent Galaxy to 15W. To hit full speed you need three matched things: a PPS charger, a phone that supports PPS, and a 5A cable.
What you actually need for full-speed charging
| Piece | What to look for |
|---|---|
| Charger | Spec sheet that explicitly lists “PPS” plus a voltage range (e.g. 3.3–11V), and enough wattage (45W for a Galaxy Ultra) |
| Cable | A 5A / e-marked USB-C to USB-C cable for 45W (a 3A cable caps you lower) |
| Phone | One that supports PPS / the maker’s “Super Fast Charging” |
What PPS actually is
Standard USB Power Delivery charges in fixed voltage steps — 5V, 9V, 15V, 20V. The phone picks the nearest step and burns off the difference as heat. PPS, part of the USB PD 3.0 standard, throws out the fixed steps. It lets the phone request almost any voltage between roughly 3.3V and 21V in tiny 20-millivolt increments, and adjust continuously as the battery fills. Because the charger delivers exactly what the battery wants moment to moment, less energy is wasted as heat — which means faster charging and less long-term stress on the battery.
Why a “45W” charger can charge at 15W
This is the gotcha that frustrates people. Samsung’s 45W “Super Fast Charging 2.0” is built directly on PPS. If you plug a recent Galaxy into a charger that says “45W” or “PD 3.0” but lacks PPS, the phone can’t negotiate its fast profile and falls back to a slow 15W. The wattage on the label is meaningless if the PPS handshake never happens. This is why a cheap high-wattage charger can underperform a genuine PPS charger of the same rating — and why people wrongly conclude their phone “doesn’t really fast charge.”
Which phones use PPS
Samsung Galaxy is the headline case: its 25W and 45W Super Fast Charging both rely on PPS, and the fastest 45W speeds are reserved for the Ultra and Plus models (the base, Flip, Fold and A-series typically cap lower). If you own a Galaxy, a PPS charger isn’t optional — it’s the whole point. Our Galaxy S26 Ultra review covers how that plays out on Samsung’s current flagship.
Other phones vary. iPhones charge over standard USB PD and don’t require PPS to hit their fast-charge speeds, so any quality 20W+ PD charger works. Google Pixels use a mix of PD and PPS. Many Chinese brands — OnePlus, OPPO, realme, Xiaomi — use their own proprietary fast-charging systems (SuperVOOC, HyperCharge and the like) that need the maker’s own charger and don’t use PPS at all. The lesson: match the charging tech to your specific phone rather than chasing the biggest number.
The cable matters too
PPS speed dies on a bad cable. To pull 45W you need a USB-C to USB-C cable rated for 5 amps, which by spec contains an e-marker chip; a common 3A cable will cap you at a lower wattage no matter how good the charger is. This is the same cable confusion we untangle in what your USB-C cable can actually do — power capability is negotiated by the cable as much as the charger.
How to tell if you’re getting fast charging
Two quick checks. First, your phone usually tells you: a Galaxy shows “Super Fast Charging” on the lock screen when PPS is active, not just “Charging.” Second, read the charger’s fine print before buying — a PPS unit lists a programmable range like “PPS: 3.3V–11V” alongside its fixed PD profiles. If the spec sheet never mentions PPS, assume it doesn’t have it.
What to buy
For a Samsung Galaxy or any PPS phone, get a GaN charger that explicitly lists PPS at the wattage your phone supports (45W for an Ultra), plus a 5A USB-C cable. For an iPhone, a reputable 20–30W USB PD charger is all you need — PPS won’t add speed. And if you use a proprietary-charging phone, keep the charger it came with for full speed. The number on the box is only half the story; the standard underneath it is the half that matters.
Frequently asked questions
What is PPS charging?
PPS (Programmable Power Supply) is part of the USB Power Delivery 3.0 standard. Instead of charging in fixed voltage steps, it lets the phone and charger negotiate the exact voltage in real time — roughly 3.3V to 21V in tiny increments — which reduces heat, charges faster and is gentler on the battery over time.
Why is my 45W charger charging my phone slowly?
Most likely it lacks PPS. Samsung’s 45W Super Fast Charging requires PPS, so a charger labeled ’45W’ or ‘PD 3.0’ that doesn’t support PPS will drop a recent Galaxy to about 15W. Check the charger’s spec sheet for ‘PPS’ and a voltage range; if it isn’t listed, that’s your answer.
Do iPhones use PPS charging?
No. iPhones charge over standard USB Power Delivery and reach their fast-charge speeds without PPS, so any good 20W or higher PD charger works. PPS mainly matters for Samsung Galaxy phones and some Android models.
How do I know if a charger has PPS?
Read the specifications. A PPS charger lists a programmable range such as ‘PPS: 3.3V–11V’ in addition to its fixed PD profiles (5V/9V/15V/20V). If the listing never mentions PPS, assume it doesn’t support it.
Does PPS charging damage the battery?
It’s the opposite — PPS is gentler on the battery. By delivering exactly the voltage the battery needs at each moment, it wastes less energy as heat, and heat is the main thing that ages a lithium battery. So PPS tends to be better for long-term battery health, not worse.