Date: 23/09/2009

Low power multifunction PMIC solution for portable Li-Ion/Polymer batteries

Linear has introduced the LTC3553, a micropower multifunction power management integrated circuit (PMIC) solution that packs a USB-compatible linear PowerPath manager, a stand-alone battery charger, a high efficiency synchronous buck regulator, a low dropout linear regulator and pushbutton controller in an ultrathin (0.55mm) 3mm x 3mm QFN package and suitable for portable Li-Ion/Polymer battery-based applications including personal navigation devices (PNDs), media players, handheld medical and industrial devices.

The key features of LTC3553 are,

12uA of ultralow quiescent current in standby mode with all outputs on
Charge current programmable up to 400mA from USB or 5V wall adapter input, with thermal limiting
240mOhm internal ideal diode provides low loss power path from battery to load
stand-alone autonomous operation
Better transition between input power sources
Instant-on operation with discharged battery
200mA synchronous buck regulator with burst mode operation
Buck regulator adjustable output voltage range: 0.8V to VBAT
LDO: 150mA output current, output voltage down to 0.8V

The integrated pushbutton controller enables one-button power up and power down sequencing and a status signaling output indicating the button state. The controller also provides a Hard Reset state for software lockup recovery or to enable an ultralow battery drain state (typically 0.2uA) for the device.

Package: Thermally enhanced, (0.55mm) 20-Lead 3mm x 3mm UTQFN package
Price: Starts at each $2.25 for 1k pieces
For more details visit www.linear.com