As multi-port GaN chargers and desktop charging hubs push the limits of high power and high integration, internal architecture has to do more than just convert power efficiently. It needs smart protocol recognition across multiple ports, independent current limiting, and complex power distribution.
Teardowns from ChargerLAB reveal that iSmartWare’s SW3536 dual-port fast-charge protocol controller has been adopted by tier-1 brands like Anker, Lenovo, UGREEN, NIO, and Belkin. Featured in over 20 commercialized models, this chip scales effortlessly across the entire power spectrum—from 65W travel bricks to massive 500W desktop charging stations.
The SW3536 is a highly integrated step-down protocol IC custom-engineered for high-wattage, multi-port chargers. It drives both USB-A and USB-C outputs while enforcing independent current limits per port. Packing a highly efficient 7A synchronous buck converter with a wide 5V–36V input range, the chip can handle up to 140W on its own.
Protocol versatility is unmatched, covering PD3.1, PPS, QC5, QC4+, SCP, AFC, FCP, and SFCP, alongside easy MCU customization. Thanks to built-in Type-C logic, BC1.2 detection, CC/CV closed-loop control, and dual-chip dynamic power sharing, engineers can drastically simplify PCB layouts. Safety is equally robust, featuring soft-start, input/output OVP/UVP, OCP, SCP, and NTC thermal protection. All this functionality is packed into a space-saving QFN28 package, shrinking the output-stage footprint considerably.
The massive rollout of the iSmartWare SW3536 proves its rock-solid stability when managing demanding power budgets. In the 65W–100W sweet spot (e.g., Anker 2 USB-C and one USB-A GaN chargers and MOMAX pull-cable chargers), it operates as the dual-path buck and protocol control engine.
When stepping up to 140W+ high-power desktop hubs (like the UGREEN 500W, Lenovo ThinkBook 170W, and HUNDA 300W charging stations), it teams up with secondary buck regulators to manage specific port protocols, secondary voltage drops, and output control, establishing a truly independent multi-port architecture. This "modular + dynamic scaling" approach cuts down single-channel complexity while leveraging true SoC integration to elevate overall reliability and device compatibility, cementing the SW3536 as a core technical foundation for elite GaN fast chargers.
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