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FB = 0.6 V.\nFeedforward C2/C8 100 pF across the upper divider resistor (TI: optional, 6.8 pF with 200k):\nzero at 159 kHz (+1V1, 10k) and 106 kHz (+3V3, 15k).\n+2V5: LDO AP2112K-2.5 from +3V3, so VCCIO (3.3 V) comes up before VCCAUX.\nL1, L2: 2.2 uH SXN SMNR4020-2.2UH, 4x4 mm, Isat 3.4 A (> 3 A switch current limit), 46 mOhm.\nECP5 power-up: no sequencing required, ramp rate 0.01-10 V/ms (DS1044).\nUSB inrush: only C1 + C7 = 9.4 uF sit directly on VBUS (USB limit 10 uF). The buck outputs\ncharge through the 800 us internal soft start. Keep extra capacitance off +5V." 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