LTC4090-5

FEATURES n Seamless Transition Between Power Sources: Li-Ion Battery, USB, and 6V to 36V Supply (60V Max) n 2A Output High Voltage Buck Regulator with Bat-Track™ Adaptive Output Control (LTC4090) n Internal 215mW Ideal Diode Plus Optional External Ideal Diode Controller Provides Low Loss PowerPath™ When External Supply/ USB Not Present n Load Dependent Charging from USB Input Guarantees Current Compliance n Full Featured Li-Ion Battery Charger n 1.5A Maximum Charge Current with Thermal Limiting n NTC Thermistor Input for Temperature Qualified Charging n Tiny (3mm × 6mm × 0.75mm) 22-Pin DFN Package APPLICATIONS n HDD-Based Media Players n Personal Navigation Devices n Other USB-Based Handheld Products n Automotive Accessories LTC4090/LTC4090-5 USB Power Manager with 2A High Voltage Bat-Track Buck Regulator DESCRIPTION The LTC®4090/LTC4090-5 are USB power managers plus high voltage Li-Ion/Polymer battery chargers. The devices control the total current used by the USB peripheral for operation and battery charging. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit. The LTC4090/LTC4090-5 also accommodate high voltage power supplies, such as 12V AC/DC wall adapters, Firewire, or automotive power. The LTC4090 provides a Bat-Track adaptive output that tracks the battery voltage for high efficiency charging from the high voltage input. The LTC4090-5 provides a fixed 5V output...