This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS51225B: Vin is 7V but Vout isn't 5V

Part Number: TPS51225B

TPS51225B output  is  5V and 3.3V, Vin is 8V,the output is right  .   but  Vin is less than 8V ,such as 7V, the output is less than 5V ,3.3V is right. I read the data sheet Vin range is 5.5~24 .  Why the output isn't 5V when the Vin less than 8V?