Power Bank PD & PPS Charging Reference
A practical engineering reference for USB Power Delivery and PPS in power banks, covering voltage/current profiles, controller behavior, cable limits, device negotiation and buyer validation points.
The printed wattage is only one part of the charging system.
Controller capability, port design, cable rating, thermal limits and the connected device all affect the negotiated USB-C output that a buyer can actually validate.
Quick Engineering Review
Use these four checks before accepting a PD / PPS charging claim for the released SKU.
Fixed PDOsDocument supported voltage / current combinations by port and direction.
PPS / APDOVerify programmable range and measured negotiation for the exact sample state.
Cable & PortConfirm cable capability, port direction and connector state support the target profile.
Multi-Port BehaviorDefine allocation and simultaneous-use rules for realistic buyer use cases.
Buyer Decision Points
Fixed PDO SupportMaximum wattage alone does not prove device compatibility; record the actual fixed profiles.
PPS / APDODo not assume PPS from a PD label; verify the programmable range and negotiation.
Cable & Port StatePort direction, cable capability and connector behavior must support the intended profile.
Device MatrixTest target phones, tablets or other devices against the released port and cable state.
Related Engineering
Cell & PACK Selection →
Thermal & DC-DC Efficiency →
Built-In Cable Loss →
High-Power PD Power Banks →
Sample Approval Checklist →
Primary reference: USB-IF USB Power Delivery.
PD / PPS FAQ
Does 45W mean every device can charge at 45W?
No. The device, source profile, cable and negotiation must all support the same operating point.
Is PPS the same as standard PD?
No. PPS is a programmable capability that should be verified by APDO range and measured negotiation.
Can multi-port use reduce output?
Yes. Multi-port allocation rules can change available power by port and should be tested as part of the released SKU.
Additional Power Bank PD & PPS FAQ
What is a USB PD profile?
A PD profile is a supported voltage-and-current operating point advertised by the source. The target device and cable must also support the required profile for that power level to be used.
What is a PPS APDO?
PPS uses an Augmented Power Data Object to define a programmable voltage and current range rather than only fixed PD voltage steps.
How should PD compatibility be verified?
Check the source profiles, cable capability, target device negotiation and measured voltage, current and power under the intended use case.
Why can built-in cable output differ from USB-C port output?
The built-in cable may have its own controller, conductor size, connector or current limit, so its maximum output can differ from the USB-C port.
Does a 100W cable make a 45W power bank output 100W?
No. The cable only needs to support the required current and protocol. The source electronics and negotiated PD profile still determine maximum output.
What should be checked during simultaneous multi-output use?
Verify port-priority rules, total power allocation, voltage changes, cable behavior and whether enabling another output reduces the primary port's available power.
Why should PD/PPS behavior be tied to the exact SKU revision?
Controller, firmware, PCB, ports and cable changes can alter negotiation and output behavior, so protocol results should match the released configuration.
Need to Validate a PD/PPS Power Bank Platform?
Send the target devices, required charging profiles, port configuration and cable architecture. ZEROSET can map the requirement to the current platform and validation scope.
