The LTC?3577 is a highly integrated power management
IC for single cell Li-Ion/Polymer battery applications. It
includes a PowerPath manager with automatic load prioritization,
a battery charger, an ideal diode, input overvoltage
protection and numerous other internal protection features.
The LTC3577 is designed to accurately charge from current
limited supplies such as USB by automatically reducing
charge current such that the sum of the load current and
the charge current does not exceed the programmed input
current limit (100mA or 500mA modes). The LTC3577
reduces the battery voltage at elevated temperatures to
improve safety and reliability. Effi cient high current charging
from supplies up to 38V is available using the on-chip
Bat-Track controller. The LTC3577 also includes a pushbutton
input to control the three synchronous step-down
switching regulators and system reset. The onboard LED
backlight boost circuitry can drive up to 10 series LEDs
and includes versatile digital dimming via I2C input. The
I2C input also controls two 150mA LDOs as well as other
operating modes and status read back. The LTC3577 is
available in a low profi le 4mm × 7mm × 0.75mm 44-pin QFN package.