The ADP5320 highly integrated power management unit (PMU) combines nine digitally adjustable regulators, a fuel gauge, a 12-bit analog-to-digital converter (ADC), 2 kb of one time programmable (OTP) memory, anticounterfeit logic in a 42-ball, 2.880 mm × 2.980 mm WLCSP. The regulators include: 2× buck-boost, 1× buck regulator, 5× low dropout (LDO) regulators, and one low input LDO. The ADP5320 meets demanding performance and board space requirements for wearable applications.The ADP5320 operates from a 1.8 V to 5.5 V input supply voltage range, enabling the device for use with multiple types of battery inputs including: 2S/3S Zinc-air coin-cells or Li-poly/Li-ion batteries, as well as other types of dc power sources.The ADP5320 PMU fuel gauge includes a precision 16-bit coulomb counter that integrates battery current flowing through the device. A 12-bit ADC is included to monitor battery voltage, output supply voltages, and the junction temperature. Other features include a programmable sequencing engine and system fault recovery.The ADP5320 PMU buck-boost regulators are high efficiency, step up and step down regulators that operate at input voltages greater than, less than, or equal to the regulated output voltage. All regulators, including the six LDOs, are digitally programmable to meet different power requirements for many applications.The ADP5320 includes a 2-wire, I2C-compatible, digital interface and is rated at the −10°C to +70°C operating junction temperature range.APPLICATIONSWearable medical applicationsInternet of Things (IoT) applicationsDisposable sensor devicesBattery-powered devices