Power manager for portable USB devices
20 September 2006
Power Electronics / Power Management
Linear Technology's LTC4085 is a monolithic autonomous power manager, ideal diode controller and standalone battery charger for portable USB devices, all in one package. The chip features PowerPath control that provides power to the USB peripheral device and charges the peripheral's single-cell Li-Ion battery from the USB Vbus or a wall adapter power supply. The IC directs power to the load through the USB bus rather than extracting power from the battery, keeping it fresh. Once the power source is removed, current flows from the battery to the load through an internal 200 mΩ low-loss ideal diode, minimising voltage drop and power dissipation. The LTC4085 offers the option of charging the battery at a higher rate (up to 1,5 A) than USB specifications allow (100/500 mA) when the wall adapter is present. The LTC4085's float voltage is preset at 4,2 V with guaranteed 0,8% accuracy from 0 to 85°C. Charge current is programmed simply using a resistor. The LTC4085 comes in 14-pin 4 x 3 mm DFN package with a 0,75 mm profile.
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