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Low Drop-Out (LDO) Linear Regulators: Design ...

IEEE Santa Clara Valley (SCV). Solid State Circuits Society February 11, 2110. Low Drop-Out (LDO) Linear regulators : Design Considerations and Trends for high Power- Supply Rejection (PSR). Edgar S nchez-Sinencio TI J. Kilby Chair Professor Analog and Mixed-Signal Center, Texas A&M University 1. Power Management Why do we need power management? Batteries discharge almost linearly with time. To optimize the charging of batteries to be safe and extend their life. Circuits with reduced power supply that are time dependent operate poorly. Optimal circuit performance can not be obtained. Mobile applications impose saving power as much as possible. Thus, the sleep mode and full power mode must be carefully controlled. Objective of a power converter is to provide a regulated output voltage Voltage Battery ( Li-ion). Regulated Voltage Time 2. What are the conventional power converters? Low drop out Linear regulator (LDO). Switch inductor regulator (switching regulators ). Switch capacitor regulator (charge pump).

High PSR using Feed‐Forward Ripple Cancellation Technique ¾M. El‐Nozahi, A. Amer, J. Torres, K. Entesari, and E. Sánchez‐Sinencio, “A 25mA 0.13µm CMOS LDO Regulator with Power Supply Rejection better than ‐56dB up to 10MHz using Feed‐Forward Ripple Rejection Technique,”

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