USB-C Power Delivery (PD 3.1)

Everything Magnias makes for a USB-C fast-charging port, from the wall charger to the device, 20 W to 240 W.

240 WMax power over one USB-C cable

5 → 48 VAuto-negotiated charging voltage

Both waysPower can flow to or from the device

What is USB-C Power Delivery?

USB-C Power Delivery (USB PD) is the fast-charging standard behind modern USB-C. One reversible cable carries both data and power, and the two ends negotiate the right voltage automatically, from 5 V up to 48 V, and up to 240 W. It's what lets a single charger top up a phone, a laptop, or even a power tool.

You'll find USB-C PD in phone & laptop chargers, power banks, monitors, docks and hubs.

One cable, both directions Power can flow to the device or out of it, a laptop can charge, or become the charger.

It picks its own voltage 5 / 9 / 15 / 20 V, rising to 28 / 36 / 48 V on the newest "EPR" tier.

Up to 240 W Enough for laptops, monitors and power tools, not just phones.

Where Magnias fits in the port

Magnias makes the semiconductors around the USB-C connector, the power switches that turn VBUS on and off safely, and the protection that shields the port from surges, static and faults. Every colored block below is a part we supply.

Source ↔ USB-C ↔ Sink. Colored = Magnias supplies it; grey = the controller / SoC.

Deep dive

For the design engineer

How the parts are chosen, the topology, and the device per role at each power class.

The MOSFET roles, and why they come in pairs

Why two MOSFETs, back-to-back?

USB-C VBUS carries current in BOTH directions, source and sink swap roles (plus OTG and fast-role-swap). A single MOSFET blocks voltage one way, but its body diode conducts the other. So every PD VBUS path uses two N-channel MOSFETs source-to-source: one blocks forward, one blocks reverse. That is why the power-tier table lists the VBUS B2B parts as pairs (×2).

N-MOS vs P-MOS, which to use

	N-MOS	P-MOS
RDS(on) & cost	Lower (2–3×), widest lineup	Higher, narrower lineup
High-side gate drive	Needs charge pump	Simple pull-down, none needed
Best fit	Efficiency + high current (with a PD IC)	Discrete BOM, default-OFF safe

Five discrete-FET roles in one PD port

VBUS back-to-back switchOVP / OCP cut-offSynchronous rectifierIdeal-diode reverse blockHot-swap / inrush

VDS rule of thumb: 60 V class for SPR, 100 V on the VBUS path, 150 V on the SR once output reaches 48 V EPR.

PD charger reference circuit

A flyback fast-charger from AC mains to the USB-C port, with the Magnias part labeled in each slot.

MOSFETs by power tier

One device per role, 20 W → 240 W, every P/N verified in-production.

Tier	VBUS B2B	Load / Protect	HV Switch	Sync Rect
20–30 WSPR 5 / 9 V	PMS9R5D03BQ	PMS0314AQ	PMH65N510GF	PMS0602AG
45–65 WSPR 15 / 20 V	PMS11R5D06HQ	PMS0401DG	PMH65N340CF	PMS3N10EG
100 WSPR 20 V × 5 A	PMS1R2N06TG ×2	PMS0401DG	PMH65N270AF	PMS3N10EG
140 WEPR 28 V	PMS1012AQ ×2	PMS105N06AG	PMH65N270AF	PMS6R5N12AG
240 WEPR 48 V	PMS3R9N15HL8 ×2	PMS105N06AG	PMH65N130DF	PMS3R9N15HL8

VDS carries EPR transient headroom. Above 100 W the VBUS back-to-back is two single low-Rds N-MOS in series, the same 100 / 150 V parts used on the SR side.

PD sink switch, one part for the whole sink ring

On the device (sink) side, the PD sink switch is the high-side switch that connects USB-C VBUS to the system rail once PD negotiation completes. It integrates the power FET plus the protection you would otherwise build from a discrete back-to-back FET, a controller, and a sense network:

TRCB, true reverse-current blockProgrammable soft-start, limits inrushUVLO / OVLO, connects only in a safe VBUS windowThermal shutdownShort-circuit protection

PSW83730 33 mΩ · 5.5 A · DFN3030-12L PSW83731 20 mΩ · 8 A · DFN3030-12L PSW83743 20 mΩ · 8 A · DFN3030-12L

Completes the PD BOM

Beyond the MOSFETs and protection, a full PD design pulls in these, all from Magnias:

Bridge Rectifier AC-line input rectification (adapter) Buck Converter VBUS → system-rail step-down (device side) Load / Power Switch VBUS gating, OVP disconnect, downstream-port enable Schottky Snubber / aux / freewheel / ORing diodes LDO Controller housekeeping / low-noise rails

Typical PD designs

PD charger / adapter HV + SR MOSFETs, VBUS back-to-back pair, TVS & data ESD.

PD sink / device PD sink switch, OVP FET, input eFuse, CC + data ESD.

Power bank / bidirectional Back-to-back VBUS FETs, ideal-diode blocking, battery-path FETs.

Dock / hub / monitor Ultra-low-cap data ESD, CC ESD, downstream VBUS load switch.

Core PD parts

MOSFET PD Sink Switch TVS ESD eFuse

Available in commercial and AEC-Q101 (-A) grades; halogen-free (-H) options too.

Designing a USB-C PD port? Get the full BOM.

Tell us the power class and whether the port is source, sink or bidirectional, our FAE team maps the back-to-back pair, HV / SR MOSFETs, sink switch and ESD / TVS, and ships samples within one business day.