LTC3556

FEATURES POWER MANAGER n High Efficiency Switching PowerPathTM Controller with Bat-TrackTM Adaptive Output Control n Programmable USB or Wall Current Limit (100mA/500mA/1A) n Full Featured Li-Ion/Polymer Battery Charger n Instant-On Operation with a Discharged Battery n 1.5A Maximum Charge Current n Internal 180mΩ Ideal Diode Plus External Ideal Diode Controller Powers Load in Battery Mode n Low No-Load IQ when Powered from BAT (<30µA) DC/DCs n Dual High Efficiency Buck DC/DCs (400mA/400mA IOUT) n High Efficiency Buck-Boost DC/DC (1A IOUT) n All Regulators Operate at 2.25MHz n Dynamic Voltage Scaling on Two Buck Outputs n I2C Control of Enables, Mode, Two VOUT Settings n ENALL Pin with Power-Up Sequence Control n Low No-Load Quiescent Current: 20µA Each APPLICATIONS n HDD-Based MP3 Players, PDAs, GPS, PMPs n Other USB-Based Handheld Products LTC3556 High Efficiency USB Power Manager with Dual Buck and Buck-Boost DC/DCs DESCRIPTION The LTC®3556 is a highly integrated power management and battery charger IC for Li-Ion/Polymer battery applications. It includes a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, and three synchronous switching regulators (two bucks and one buck-boost). Designed specifically for USB applications, the LTC3556’s switching power manager automatically limits input current to a maximum of either 100mA or 500mA for USB applications or 1A for adapter-powered applications. Th...