Unveiling the All-New Circuit Design of Apple’s Latest 20W Fast Charger

Unveiling the All-New Circuit Design of Apple’s Latest 20W Fast Charger


The surge in power above 20W for Apple’s iPhone charging and excluding chargers from phone packages has ignited the 20W fast charger market. While this has benefited many domestic brands, Apple’s original chargers continue to outperform competitors in sales. In this context, we delve into the disassembly and evaluation of the charging head of the 20W fast charger previously dissected by ChargerLAB.

The New Apple 20W Charger: Exterior Insights

The latest version of the 20W charger retains the previous design, boasting a white glossy casing with gray upper and lower ends. The charger has a fixed national standard plug and features labeled parameters on the input end. The charger’s sleek appearance is consistent with its predecessors.

Technical Specifications

  • Product Model: A2940
  • Input: 100-240V~50/60Hz 0.5A
  • Output: 5V3A or 9V2.22A
  • Manufacturer/Production: Seelk Technology (Shenzhen) Co., Ltd.
  • Certifications: CCC and VI Level Energy Efficiency

USB-C Interface

The output side presents a centrally positioned USB-C interface. ChargerLAB’s dissection revealed that this latest charger version houses an integrated protocol function within its customized power chip, resulting in enhanced integration.

Charging Performance

Tested with ChargerLAB’s POWER-Z MF001, the charger’s output at the interface end provides a power output of 8.95V 2.18A, totaling 19.54W. This result was observed while charging an iPhone 14 Pro Max using the new 20W charger.

Internal Design Insights

Disassembly and PCB Examination

Upon disassembling the charger, the internal design revealed itself. The PCB module showcased a highly integrated and efficient design. The internal black silicone gel aids in transferring the heat generated by the transformer to the casing. Furthermore, the PCB module’s compact and organized architecture is notable.

PCB Components and Architecture

The power control chip, denoted by “ZN1535C,” is from PI and offers high integration, simplifying the design and manufacturing of the flyback power converter. Additionally, the charger boasts a wide range of output voltages and a feedback system, contributing to its high efficiency and reliability.


This dissection of the new Apple 20W charger showcases its external dimensions, interface protocol testing, and charging performance. The integration and efficiency of the internal design, especially with the integrated power chip, highlight the charger’s exceptional performance and reliability. Furthermore, the dominance of Apple’s original chargers in the market persists, even in the face of heightened competition.

As the industry moves forward, we can anticipate further advancements in power chip integration, technology, and design. The 20W fast charger market is at a pivotal juncture, and this dissection provides a glimpse into its dynamic evolution.

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Helen Chen

Author: CO-Founder of GCC
Hi, I'm Helen. Welcome to our website. I have worked in the this industry for over 10 years. I hope we could write all about Consumer Electronics and Gifts that we know, and teach you for free here. Hoping we could help you to better understand more about this industry, so you could avoid some risks when importing from China.

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