A power supply management chip used on a USP

The utility model discloses a power supply management chip used on a USP, belongs to the field of high performance intelligent UPS battery control chips and systems, and is widely applicable to portable consumer electronic devices such as laptops, cameras, IPADs, DVDs and intelligent handsets. The power supply management chip used on the USP comprises an analogue and digital circuit, an analogue high pressure linear voltage regulator LDO17, an analogue low pressure linear voltage regulator LDO3.3, an analogue micro-current sampling circuit CurrentSample, an analogue selector MUX, an analogue peripheral switch MOS tube drive circuit FETDriver, an SPI interface digital circuit SPIModule, an analogue clock oscillator OSC and a battery balancing circuit CellBalance. The chip supports cascade application of a single, two, three to sixteen lithium ion batteries. The chip can carry out automatic and high safety degree overvoltage, over-current and overheating protection on the lithium ion batteries in a charging and discharge process, and can also record changes of voltages, currents and residual electricity of the lithium ion batteries in real time in a usage process.