Hi, please see my reply for your questions as follow: Is there is power-up and power-down sequence? Answer: No special power sequence requirement, but it will be better to power up or down at the same time. 2.We are trying to use our own power supply design, what are the maximum current requirements for each of the power pins? We see 2A capability of the RY1303, so we want to know how is the distribution like. Answer: Based on our test, I suggest you set your current distribution as follow: 3.3V :10mA; 1.8V:20mA; 0.9V:0.9A; Yanjun