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With the development of electronic systems , high stability , efficient and convenient power management increasingly urgent demand for power chip , accordingly, the research in this area has become a hot topic in today's world. Many researchers have some power management power chip based technology has been studied , in which the stability of power chip power management features caused a lot of interest of researchers . This article is the power management of the stability of the power chip study , the first of power stability, temperature stability and load stability to study , found that the same topology, the power management chip Stability of the power used by a determines the performance of operational amplifier ; Secondly , the paper using a zero - pole analysis approach to the operational amplifier stability study and by the phase and gain margin to derive its stability ; Finally, the theoretical design of these studies apply to power management high performance and high stability power chip operational amplifier and its application to self-tuning function with a stable lithium battery charging chip. Chip constant current, constant voltage , and temperature adjustment three charging loop stability is well considered , by using the above theoretical studies , charging chip will not only get a good stability, but also get a lot of other high-performance the simulation results show that the final charge results 4.191V, 4.2V relative to an ideal charging voltage is only 0.3 % error ; when the chip temperature exceeds 120 ℃ , the chip can automatically adjust the temperature. CSMC CSMC0.5um CMOS using hybrid technology to achieve the chip , the test results show that when the reference circuit Trimming the case , the charging voltage can reach 4.19V, such as an external programmable resistor is 2K, the charging current is 505mA.
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