LTC3555-3

FEATURES Power Manager n High Efficiency Switching PowerPath™ Controller with Bat-Track™ Adaptive Output Control n Programmable USB or Wall Current Limit (100mA/500mA/1A) n Full Featured Li-Ion/Polymer Battery Charger n 1.5A Maximum Charge Current n Internal 180mΩ Ideal Diode + External Ideal Diode Controller Powers Load in Battery Mode n Low No-Load Quiescent Current when Powered from BAT (<32µA) DC/DCs n Triple High Efficiency Step-Down DC/DCs (1A/400mA/400mA IOUT) n All Regulators Operate at 2.25MHz n Dynamic Voltage Scaling on Two Outputs n I2C or Independent Enable, VOUT Controls n Low No-Load Quiescent Current: 20µA n 28-Pin (4mm × 5mm × 0.75mm) QFN Package APPLICATIONS n HDD-Based MP3 Players, PDAs, GPS, PMPs n Portable Medical Products n Handheld Instrumentation n Other USB-Based Handheld Products LTC3555/LTC3555-X High Efficiency USB Power Manager + Triple Step-Down DC/DC DESCRIPTION The LTC®3555 family are highly integrated USB compatible power management and battery charger ICs for Li-Ion/Polymer battery applications. They include a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode and three general purpose synchronous step-down switching regulators. The LTC3555 family limits input current to either 100mA or 500mA for USB applications or 1A for adapter-powered applications. Unlike linear chargers, the LTC3555 family’s switching architecture transmits nearly all of the power available f...