TPS53015DGS
Our company uses four TI TPS53015DGS as 4.2V,3.8V,5V and 3.3V. The working voltage range required in the specification of this power supply is 4.5-28V. The test found two serious problems, so it cannot be used normally at present.
1. When it is larger than 12V, 4.2V work is abnormal, and negative pulse of 2ms appears at 288ms, resulting in power loss of the main module and failure to start normally, as shown in the figure (20V).
2. When 12V is working, 4.2V works normally, but 90% of 3.8V power supply can not output power normally, only about 3.0V, occasionally positive output 3.8.