Teardown Report: Baseus PicoGo Pro 45W GaN Charger — HYSiC HYC3688H Integrated GaN Primary, 69.2g, PD3.2/PPS/AVS
2026-09-22 · Compiled by Best IT Parts from public industry reporting
Baseus' PicoGo Pro is a 45W GaN wall charger whose selling point is an on-board smart display showing charging power, battery level and temperature, with a touch key switching between smart, battery-care and performance modes and auto shut-off when full. Model E01247 is rated 100-240Vac 50/60Hz 1.6A input with 5V/3A, 9V/3A, 12V/3A, 15V/3A and 20V/2.25A outputs, measures roughly 35.11mm across and 40.82mm tall, and weighs 69.2g. Protocols measured with a POWER-Z KM003C include PD3.2/PPS/AVS, UFCS, QC3.0, QC4+, FCP, SCP and AFC, with five fixed PDOs, a 5-11V/4.5A PPS range, 9-20V AVS and 5-11V/4A UFCS.
Inside, the PCBA uses stacked sub-boards wrapped in blue thermal silicone, about 29.68 x 27.76mm and 30.74mm thick. The EMI board carries a delay fuse, a common-mode choke and two World WRABS20MG 1000V/2A soft-recovery bridges in ABS packages sharing heat. The transformer board holds two 400V/39µF high-voltage electrolytics and an ATQ1813-300H transformer, with an optocoupler and chip Y capacitor behind.
Primary control is HYSiC's HYC3688H in a 6 x 8mm QFN, an integrated PWM, sense-FET and GaN three-in-one controller with 700V D-GaN, lossless current sensing, high-voltage startup and protection for over-voltage, transformer saturation, overload and over-temperature. The secondary side runs QR plus SR: the HY923C SR controller (SOT23-6, 3.2-25V output, 150V drain detection, adaptive pre-turn-off) drives a PINGWEI D100N10ES 100V/5mΩ MOSFET in DFN5x6.
Protocol control is handled by the HY5515A, a 32-bit ARM MCU protocol chip with 32Kb Flash and 4Kb SRAM in QFN24 supporting PD3.2, PPS, QC3.0+ and UFCS over I2C and serial, feeding voltage, current and power data to the display. The VBUS switch is a 30V/6.2mΩ CRM CRMQTL0308A, output filtering uses a 25V/680µF Koshin capacitor, and a Puya PY25Q128HA 128Mbit SOP8 flash stores firmware, with a separate MCU for the screen. For repair shops and adapter buyers, the takeaway is a fully integrated GaN primary with matching secondary and protocol silicon from one vendor family, plus display parts for service stock.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.