Tool/software:
Hello, I am testing the TPS6521402 chip and encountered the following situation during the testing process, which caused the PMIC to fail to start. Can you help analyze the reason?
① EN/MODE/VSEL three pins are pulled up to 3.3V with the power supply
② The GPO pin is connected to the power supply through a pull-up resistor, but during the power up process, there are three periodic pulses that continue to output a low level
③ As a result, BUCK2 outputs 0.8V, while the other power sources do not output voltage
④ The above tests were conducted under no-load conditions
⑤ Please refer to the test image below for details
