LTC3577-3

LTC3577-3/LTC3577-4 Highly Integrated Portable Product PMIC Features n Full Featured Li-Ion/Polymer Charger/PowerPath™ Controller with Instant-On Operation n Triple Adjustable High Efficiency Step-Down Switching Regulators (800mA, 500mA, 500mA IOUT) n I2C Adjustable SW Slew Rates for EMI Reduction n High Temperature Battery Voltage Reduction Improves Safety and Reliability n Overvoltage Protection Controller for USB (VBUS)/Wall Inputs Provide Protection to 30V n Integrated 40V Series LED Back Light Driver with 60dB Brightness Control and Gradation via I2C n 1.5A Maximum Charge Current with Thermal Limiting n Battery Float Voltage: 4.2V (LTC3577-3) 4.1V (LTC3577-4) n Pushbutton ON/OFF Control with System Reset n Dual 150mA Current Limited LDOs n Start-Up Timing Compatible with SiRF Atlas IV Processor n Small 4mm × 7mm 44-Pin QFN Package Applications n PNDs, DMB/DVB-H, Digital/Satellite Radio, Media Players n Portable Industrial/Medical Products n Other USB-Based Handheld Products Description The LTC®3577-3/LTC3577-4 are highly integrated power management ICs 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 LTC3577-3/LTC3577-4 are designed to accurately charge from current limited supplies such as USB by automatically reducing charge current such that the sum of the lo...