PMU (full name Power Management Unit) is a highly integrated power management solution for portable applications. It integrates several traditionally separate types of power management devices, such as DC/DC converters (DC/DC) and low-dropout linear regulators (LDO) into one package, reducing the number of components and board space while achieving higher power conversion efficiency and lower power consumption.
1. General composition of PMU
1) DC/DC switching power supply
2) LDO low voltage dropout linear regulated power supply
3) Resistance and capacitance of the control part
PMU is mostly used as a power management integrated unit for specific main chips in consumer electronics. It can provide power supplies of different voltages to the main control and other peripherals, and the same voltage power supply to different working units, such as cameras, radio frequency, etc. In order to save energy, it is also equipped with a power on/off control circuit, as well as charging control, etc. There are additional protection circuits for overvoltage, undervoltage, overtemperature, etc., so that all units can work normally.
The PMU package used here as an example is TQFN-48 (6x6), which occupies a small space and is suitable for the demand for smaller and smaller electronic products. Lower power consumption and more efficient conversion efficiency make electronic products more durable.
2. Layout order of PMU modules
Generally, for PMU modules, the DC/DC switching power supply module will be laid out first, followed by the relatively small power supply LDO, and finally the control circuit part.
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