Skip to content

Archive

USB Power Delivery

3 articles
Tech 15 Sep 2026 5 min read

USB Power Delivery PPS Adjusts Charging Voltage

USB-C chargers can advertise several fixed voltage profiles, but some charging systems benefit from finer control. USB Power Delivery includes Programmable Power Supply, commonly shortened to PPS, which lets a compatible sink request output within an advertised programmable range. That changes where part of the voltage regulation can occur. Instead of receiving one fixed supply level for an extended period and converting all of it inside the device, a phone or other sink can ask the charger to move its output closer to the voltage needed by the device’s charging circuitry.

USB-C Charging
Tech 14 Sep 2026 5 min read

USB Power Delivery PPS Adjusts Charging Voltage in Small Steps

USB-C describes a connector, but the connector alone does not determine charging speed. A phone, charger, and cable have to support a compatible power method before higher charging rates become available. USB Power Delivery, commonly shortened to USB PD, provides a negotiation system for this job. Programmable Power Supply, or PPS, adds a more flexible mode in which a compatible device can request power at adjustable voltage and current levels.

USB-C USB Power Delivery
Tech 13 Sep 2026 6 min read

USB-C Hub Power Budgets and Passthrough Charging

A USB-C hub may advertise a high-wattage power input yet deliver less power to the laptop connected through it. Plugging in a flash drive, Ethernet adapter, or other peripheral can also change how much power remains available elsewhere. The missing power is not necessarily a fault. A hub is an active device with its own power requirements and a finite power budget. Passthrough charging adds another layer. Power enters the hub through one USB-C port, some of it operates the hub and its attached devices, and the remaining capacity can be offered upstream to the computer. The exact result depends on the hub design, charger, cable, connected loads, and the power contract negotiated over USB Power Delivery.

USB-C USB Power Delivery