The power management chip is particularly important for the *iPhone 12* because it has additional camera functions and 5G functions. The recent disassembly of iFixit shows that Apple has multiple power management chip suppliers.
In addition to Apple's own power management chip, the iPhone 12 Pro also uses Texas Instruments' camera system power management chip, as well as STMicroelectronics and Qualcomm's 5G modem equivalent chips.
The shortage of power management chips has made Apple's already tight supply situation more complicated, which further makes it difficult to meet holiday demand hopes.
Apple is now facing a tight supply of a variety of devices (including iPhone, iPad and Apple Watch), leading to longer waiting times for orders. At the end of last month, Apple CEO Tim Cook told investors that the company was "very, very hard" to resolve ongoing supply issues.