CMOS: Circuit Design, Layout, and Simulation (IEEE Press Series on Microelectronic Systems)
CMOS: Circuit Design, Layout, and Simulation (IEEE Press Series on Microelectronic Systems)
Analog IC Design with Low-Dropout Regulators (LDOs)
Analog IC Design with Low-Dropout Regulators (LDOs)
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This paper describes the implementation of a linear power management unit (PMU) for portable devices. The system includes ultra low power current and voltage references, oscillator and 8-bit analog-to-digital converter for power supply monitoring, a power-on reset, and two programmable low power low drop out regulators for up to 5mA load each. This PMU is targeted to be integrated as an intellectual property block complementary to switched regulators (DC-DC converters). The proposed linear PMU is intended to replace DC-DC converters operation in stand by mode when, usually, they operate in PFM/VFM mode. This approach results in lower power consumption, lower output voltage ripple and better PSRR figures when compared to a DC-DC operating in such modes. The PMU is able to operate in stand-alone mode as well. The whole PMU occupies an active area of 0.32mm2 in a 0.15μm CMOS process. The overall quiescent current consumption is 3.8uA.