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BQ25628EVM: VSYS reset when in OTG mode and VIN get connected

Part Number: BQ25628EVM


I have a BQ25628EVM connected to single cell Li-Ion batterypack. A µC activates OTG (REG0x18_Charger_Control_2 EN_OTG = 1) at start and resets WD (REG0x16_Charger_Control_0 WD_RST = 1) periodically. 47R loads are at SYS and VPB (PMID). All other is default.

When I connect board to USB or 5V power supply, VSYS mostly breaks down. About 5 ms after VIN rises VSYS breaks down for about 10 ms and then came back. So the hole system, powered from VSYS would get a reset. What am I doing wrong? What can I do?

Best regards,