LTC3577 Datasheet | Linear Technology

Features n Full Featured Li-Ion/Polymer Charger/Power Path™ Controller with Instant-On Operation n Triple Adjustable High Efficiency Step-Down Switching Regulators (800m A, 500m A, 500m A IOUT) n 6μA Battery Drain Current in Hard Reset n Bat-Track™ Control for External HV Buck DC/DCs n I2C Adjustable SW Slew Rates for EMI Reduction n High Temperature Battery Voltage Reduction Improves Safety and Reliability n Overvoltage Protection for USB (VBUS)/Wall Inputs Provides Protection to 30V n Integrated 40V Series LED Backlight Driver with 60d B Brightness Control and Gradation via I2C n 1.5A Maximum Charge Current with Thermal Limiting n Battery Float Voltage: 4.2V (LTC3577) 4.1V (LTC3577-1) n Pushbutton On/Off Control with System Reset n Dual 150m A Current Limited LDOs 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 Universal Remotes, Photo Viewers n Other USB-Based Handheld Products LTC3577/LTC3577-1 Highly Integrated 6-Channel Portable PMIC DESCRIPTION The LTC®3577 is a highly integrated power management IC for single cell Li-Ion/Polymer battery applications. It includes a Power Path 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 (100m A or 500m A modes). The LTC3577 reduces the battery voltage at elevated temperatures to improve safety and reliability. Efficient 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...