Universal power controller for mobile applications. Free Technical Library News

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Universal power controller for mobile applications

19.06.2007

National Semiconductor's LP3910 is a flexible Power Management Unit (PMU) solution that includes an integrated buck-boost converter and several different voltage regulators.

In addition, the LP3910 has two separate inputs for powering the device and charging batteries from the USB bus or AC adapter. The integrated charge controller supports automatic switching of energy sources. The presence of a PC interface allows designers to change the electrical characteristics and modes of the power system, such as output voltage values and options for switching power supplies for a specific application.

In portable devices using 3,3V power, a boost-buck converter will extend battery life. Li-Ion battery, as the most popular choice for powering mobile applications, typically has an operating voltage range of 2,9V to 4,2V.

When the battery is charged, the converter lowers the voltage to the required value. When the battery is discharged to less than 3,3V, the inverter boosts the voltage. Technically, this allows you to increase the battery life of the device by 10%, compared with a conventional buck converter.

Available in a 3910-pin 48x6mm LLP package, the LP6 programmable power controller contains a 4-channel 8-bit ADC for battery control and two external power supplies.

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