There have been many DC-DC power converters which are utilized in portable electronic devices, such as cellular phones and laptop computers, which are primarily supplied with power by batteries or adapters, regardless of the switching power converters or the linear power converters. For development trend of the power converters of integrated circuit, those designed to reduce standby power loss, feature well load regulation, fast load transient response, and high efficiency due to system design. A brief review of the pulse width modulation control mode and the pulse frequency modulation control mode of integrated circuit will be given in this chapter. This chapter would help readers to have a good overall view and appreciate the material in later chapter.
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