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There is no problem with starting up VCC (Vin) first or VCC (Vin) and EN (CTL, STBY, CE) at the same time. However, when starting up EN (CTL, STBY, CE) first, since current flows through the protection diode between VCC (Vin) and EN (CTL, STBY, CE), please limit the current using 10kΩ or more.