In the first quarter of 2026, a European consumer electronics brand engaged Macable to develop and manufacture a compact 65 W USB-C Power Delivery (PD) charger incorporating an integrated 1.2 m retractable cable, with a firm requirement to commence volume shipment within 60 calendar days.
Macable successfully delivered the project within the stipulated timeframe. The following sections outline the actual execution process, key technical decisions, validation outcomes, and enabling capabilities.
Client Specifications (Received Day 1)
- Output: 65 W USB-C PD (5 V / 9 V / 15 V / 20 V with PPS support)
- Integrated retractable cable: 1.2 m length, minimum 12,000 retraction cycles
- Maximum dimensions: 60 × 60 × 30 mm
- Target markets: European Union, United Kingdom, United States
- Efficiency: ≥ 90 %; no-load power consumption: ≤ 75 mW
- Commercial target: competitive unit cost at 8,000–10,000 pcs MOQ
- Required certifications: CE, UKCA, FCC, RoHS
Days 1–5 – Initial Assessment and Specification Alignment
Within 48 hours, Macable provided:
- A comprehensively completed Product Requirement Document (PRD) addressing 42 clarification items
- Technical feasibility confirmation based on GaN topology and custom high-durability retraction module
- Preliminary risk register, including component lead-time and tooling schedule considerations
- Reference documentation of comparable retractable GaN chargers previously produced
Project approval was confirmed by the client on Day 4.
Days 6–10 – Technical and Commercial Proposal
A complete proposal package was submitted, containing:
- System-level block diagram (GaN primary stage, synchronous rectification, PD 3.1 controller with PPS)
- Preliminary Bill of Materials (BOM) and manufacturing cost breakdown: approximately USD 7.65 per unit at 10,000 pcs (tooling amortized)
- Thermal simulation results: maximum case temperature projected at 67 °C under 25 °C ambient at full 65 W load
- Certification strategy and associated laboratory quotations
- Proposed three-stage prototyping plan
The proposal was approved on Day 9 following minor adjustments to cable color and logo placement.
Days 11–28 – Prototyping and Validation (Three Iterations)
- Iteration 1 (Days 11–16): Validation of core PD functionality; peak efficiency 92.4 %, successful negotiation verified across major device ecosystems
- Iteration 2 (Days 17–22): Integration of retraction mechanism; completed 12,000-cycle durability test; retraction force optimized for user experience
- Iteration 3 (Days 23–28): Design for Manufacturing (DFM) refinement; EMI pre-compliance scan achieved Class B margin following adjustment of Y-capacitor and common-mode choke
Key measured results:
- Efficiency range: 91.2–92.8 % across representative PD profiles
- Maximum case temperature: 66.8 °C during 4-hour full-load burn-in at 40 °C ambient
- Output ripple and noise: compliant with PD specification limits
- Retractable mechanism endurance: 15,200 cycles completed with no measurable degradation
Days 29–42 – Certification and Tooling Commitment
Certification activities proceeded in parallel:
- Safety: IEC 62368-1 (CB scheme report)
- Electromagnetic compatibility: EN 55032 Class B / FCC Part 15 Subpart B
- UKCA self-declaration supported by test evidence
- RoHS and REACH compliance declarations
All certification reports were received between Days 38 and 41 following first submission.
Concurrently, tooling was released:
- Precision injection molds for high-gloss ABS+PC housing
- Dedicated fixtures for retractable cable module assembly
Days 43–52 – Pilot Production Run (200 Units)
- First-pass yield: 97.8 %
- 100 % units subjected to 4-hour full-load burn-in
- Acceptance Quality Limit (AQL) Level II inspection, supplemented by 500-cycle retraction sampling
- Twenty pre-production samples were air-shipped to the client on Day 50 for final validation
Client approval was received on Day 51.
Days 53–60 – Volume Production and Initial Shipment
- Production line released on Day 53
- Daily output scaled to 2,200 units
- 100 % coverage of Automated Optical Inspection (AOI), In-Circuit Test (ICT), and final functional verification
- First batch of 10,000 units completed packaging (custom branded retail carton) and dispatched on Day 60 via combined air and sea freight
Final Delivered Performance
- Average efficiency: 92.1 %
- No-load power consumption: 68 mW
- Maximum observed case temperature under typical use: 65 °C
- Estimated product lifetime: > 60,000 hours (based on conservative electrolytic capacitor life model)
- Target field return rate: < 0.3 % within the first 12 months
Key Enablers of the 60-Day Timeline
- In-house GaN circuit design and PD protocol firmware capability
- Dedicated retractable mechanism engineering team and internal tooling workshop
- On-premises EMC pre-compliance chamber and environmental reliability laboratory
- Manufacturing Execution System (MES) providing real-time production transparency and daily client reporting
Organizations seeking accelerated development of GaN-based PD chargers, retractable-cable designs, or other custom power solutions in 2026 are invited to contact Macable for preliminary feasibility assessment.
