Multi-Function Power Management IC Fits In Tiny Package

A family of highly integrated multi-function power management ICs—the LTC3577, LTC3577-1, LTC3577-3, and LTC3577-4—is targeted at portable Li-Ion/polymer battery applications. The LTC3577/-X integrates a USB-compatible linear PowerPath manager, a standalone battery charger, overvoltage protection, 10-LED driver, pushbutton on/off control, three high efficiency synchronous buck regulators and two LDOs in a low-profile 4-mm x 7-mm QFN package. PowerPath manager features automatic load prioritization to seamlessly manage the transition between multiple input sources to power the load. It delivers up to 1.5-A battery charge current from a wall adapter supply or up to 500-mA charge current from a USB port. The LTC3577-1 and LTC3577-4 feature a 4.1-V battery float voltage for improved battery cycle life and additional high temperature safety margin, while the LTC3577 and LTC3577-3 incorporate a standard 4.2-V battery float voltage for maximum run time. The LTC3577-3 and LTC3577-4 are tailored for SiRF Atlas IV chipsets. These ICs are well suited for portable device applications such as personal navigation devices, digital media/video broadcasting, digital/satellite radio, media players, universal remotes, and portable medical and industrial devices. The LTC3577/-X is available from stock in a compact, low-profile (0.75 mm) 4-mm x 7-mm QFN-44 package. Pricing starts at $4.95 each for 1000-piece quantities. LINEAR TECHNOLOGY CORP., Milpitas, CA. (408) 432-1900.