LTC4080 Datasheet | Linear Technology

Features nn plete Linear Battery Charger with Integrated Buck Converter Battery Charger: nn Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate without Risk of Overheating nn Internal 4.5-Hour Safety Timer for Termination nn Charge Current Programmable Up to 500m A with 5% Accuracy nn C/10 Charge Current Detection Output nn 5µA Supply Current in Shutdown Mode Switching Regulator: nn High Efficiency Synchronous Buck Converter nn 300m A Output Current nn 2.7V to 4.5V Input Range (Powered from BAT Pin) nn 0.8V to VBAT Output Range nn MODE Pin Selects Fixed (2.25MHz) Constant-Frequency PWM Mode or Low ICC (23µA) Burst Mode® Operation nn 2µA BAT Current in Shutdown Mode APPLICATIONS nn Wireless Headsets nn Bluetooth Applications nn Portable MP3 Players nn Multifunction Wristwatches 500m A Standalone Li-Ion Charger with Integrated 300m A Synchronous Buck DESCRIPTION The LTC®4080 is a plete constant-current/constantvoltage linear battery charger for a single-cell 4.2V lithium-ion battery with an integrated 300m A synchronous buck converter. The small packages and low external ponent count make the LTC4080 especially suitable for portable applications. Furthermore, LTC4080 is specifically designed to work within USB power specifications. The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal 4.5-hour timer terminates the charge cycle. The full-featured LTC4080 battery charger also includes trickle charge, automatic recharge and soft-start (to limit inrush current). The LTC4080 integrates a synchronous buck converter that is powered from the BAT pin. It has an adjustable output voltage and can deliver up to 300m A of load current. The buck converter also Features low current high efficiency Burst Mode operation that can be selected by the MODE pin. The LTC4080 is available in 10-lead, low profile (0.75mm) 3mm × 3mm DFN and MSOP Exposed Pad packages. L, LT, LTC, LTM,...