Abstract
Low dropout (LDO) regulators are widely used in portable electronic devices because they occupy small chip and printed circuit board (PCB) areas. These regulators are appropriate for low-power applications because of heat dissipation. This chapter first introduces the basic LDO regulator, and then, presents concerns over compensation for loop stability to develop dominant pole compensation and C-free structures, which involves a dominant pole generated by Miller compensation capacitance. It also illustrates design flow and tips to understand the specifications and performance in analog LDO (A-LDO) regulators. The characteristics of A-LDO and digital LDO (D-LDO) regulators are then discussed and compared. LDO regulators with specific features are introduced to satisfy the requirements of various applications. Finally, the chapter introduces low-power techniques, including novel dynamic-voltage scaling (DVS) and analog DVS (ADVS), for compatible utilization in Soc applications.
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