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Power Electronics Europe News
PMIC halves power design and boosts efficiency

The 20A DA9312 enables the design of smaller, thinner notebook computers and tablets powered by dual cell stacked (2S) Li-ion or Li-Polymer batteries. Used with just a few extra components, it requires only 80mm2 of board space, which is a fraction of that of discrete component power converters, says the company. The device delivers what is claimed to be industry-leading efficiency of 98%, minimising thermal management challenges and boosting product reliability.

Rated at 90W, the PMIC is believed to be the first high power device of its type in the industry. It accepts an input voltage from 5.5 to 10.5V, which then feeds three independent power supplies. The main power converter uses capacitors to store charge and requires no external inductor. The device’s two high-frequency buck converters switch at a frequency of 1.5MHz, so 1mm high inductors and very small capacitors can be used on the outputs.

The power converter outputs half the input voltage and is rated at up to 10A. The two buck converters can each deliver up to 5A at between 2.8 and 5.35V. Alternatively, the buck converter outputs can be combined to turn the device into a dual phase regulator capable of supplying up to 10A on each output. All power supplies within the PMIC have integrated FET power switches to minimise external component count and board size. No Schottky diodes are needed.

Other features include programmable soft start up, power good signal, and remote sensing. An I2C-compatible control interface and configurable GPIO extender are also integrated, together with over-temperature and over-current protection.

The IC is supplied in a WL-CSP 6.345 x 2.815mm package, with the company’s RouteEasy ball layout for high density routing on low cost PCBs. Operating temperature range is -40 to 125°C.






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