资 源 简 介
The LTC®3577 is a highly integrated power managementIC for single cell Li-Ion/Polymer battery applicaTIons. Itincludes a PowerPath manager with automaTIc load prioriTIzaTIon,a battery charger, an ideal diode, input overvoltageprotection and numerous other internal protection features.The LTC3577 is designed to accurately charge from currentlimited supplies such as USB by automatically reducingcharge current such that the sum of the load current andthe charge current does not exceed the programmed inputcurrent limit (100mA or 500mA modes). The LTC3577reduces the battery voltage at elevated temperatures toimprove safety and reliability. Effi cient high current chargingfrom supplies up to 38V is available using the on-chipBat-Track controller. The LTC3577 also includes a pushbuttoninput to control the three synchronous step-downswitching regulators and system reset. The onboard LEDbacklight boost circuitry can drive up to 10 series LEDsand includes versatile digital dimming via I2C input. TheI2C input also controls two 150mA LDOs as well as otheroperating modes and status read back. The LTC3577 isavailable in a low profi le 4mm × 7mm × 0.75mm 44-pin QFN package.
