If you have an 8-pin power management chip without a model, you can try the following methods to find relevant information.
First, check if there are any logos, labels or logos on the chip. These may include the manufacturer's logo, product code, or lot number.
If so, you can use this information to conduct a search on the manufacturer's website or contact their technical support department for more information.
If there are no logos or identifiers, you can try to search using the appearance characteristics of the chip. For example, you can search for 8-pin power management chips with similar pin layouts and features and see if there are models similar to yours.
In addition, you can also try to ask questions in the electronic components forum or community to see if anyone else can identify the chip and provide relevant information.