Abstract
A two-stage hybrid power management unit (PMU) is presented with a highly-efficient novel ON-OFF LDO as the second stage and uses a switched-capacitor dc-dc divider as the first stage. The design targets IoT applications that operate across a wide range of load from sub-microwatt to 100’s of microwatts. The first stage provides a step-down using selectable sizing of its switches to improve efficiency to >95% across the target range of load current. The output voltage that is divided from the first stage is then regulated using the proposed ON-OFF LDO with a dropout voltage of 80% for load ranges $1\mu $ - $240\mu \text{A}$ . The design is fabricated in 28-nm CMOS technology.
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