TPS63000-Q1: When VIN is in the range of 1.8V to 2.2V, current limiting occurs.

Hi,

UVLO triggered when VIn is 1.8V.  To avoid unexpected UVLO, you should increase your input cap, a small cap in parallel with R15 will help too.

The power supply is battery or something esle? If it is battery, it will never start-up when it is voltage is 1.8V, right? always start-up with a higher input.

Regards

Tao

Thank you for the prompt response.

It seems that we are implementing the following two measures. I will give them a try:
- Measure 1: Increase the input capacitance by adding more to C4 and C5.

- Measure 2: Add a small capacitance in parallel with R15, which has a resistance of 1.74 MΩ.

The power source is a battery. It will not start up whenever the voltage is 1.8V; it will start up only when the voltage is above 2.2V.

Hi 

Sounds good.

Since the start-up voltage will be 2.2V or higher and EN is under control, i think another way to avoid unexpected UVLO is set a delay of EN.  to make device start switching when Vin is stable high.

Regards

Tao