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LTC4080XEMSE-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC4080XEMSE-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC4080X 1 4080Xf ■ Wireless Headsets ■ Bluetooth Applications ■ Portable MP3 Players ■ Multifunction Wristwatches Li-Ion Battery Charger with 1.8V Buck Regulator 500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck in 3mm × 3mm DFN The LTC4080X is a complete constant-current/constant- voltage linear battery charger for a single-cell 4.2V lithium-ion/polymer battery with an integrated 300mA synchronous buck converter. A 3mm × 3mm DFN package and low external component count make the LTC4080X especially suitable for portable applications. Furthermore, the LTC4080X is specifically designed to work within USB power specifications. The ⎯C⎯H⎯R⎯G 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 LTC4080X battery charger also includes automatic recharge and soft-start to limit inrush current. If trickle charging is desired, please see the LTC4080 datasheet. The LTC4080X integrates a synchronous buck converter that is powered from the BAT pin. It has an adjustable output voltage and can deliver up to 300mA of load cur- rent. The buck converter also features low-current high- efficiency Burst Mode operation that can be selected by the MODE pin. The LTC4080X is available in 10-lead, low profile (0.75 mm) 3mm × 3mm DFN and 10-lead MSE packages. ■ Complete Linear Battery Charger with Integrated Buck Converter in 3mm x 3mm DFN Package Battery Charger: ■ Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating ■ Internal 4.5 Hour Safety Timer for Termination ■ Charge Current Programmable Up to 500mA with 5% Accuracy ■ C/10 Charge Current Detection Output ■ 5µA Supply Current in Shutdown Mode Switching Regulator: ■ High Efficiency Synchronous Buck Converter ■ 300mA Output Current (Constant-Frequency Mode) ■ 2.7V to 4.5V Input Range (Powered from BAT Pin) ■ 0.8V to VBAT Output Range ■ MODE Pin Selects Fixed (2.25MHz) Constant-Frequency PWM Mode or Low ICC (23µA) Burst Mode ® Operation ■ 2µA BAT Current in Shutdown Mode APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118. 500mA 4.2V Li-Ion/ POLYMER BATTERY 4.7 µF 806 Ω 806k COUT 4.7 µF 4080X TA01a 10pF 1M LTC4080X EN_CHRG EN_BUCK MODE SW FB PROG VCC BAT VOUT (1.8V/300mA) 1O µH GND 4.7 µF VCC (3.75V to 5.5V) + LOAD CURRENT (mA) 0.01 40 60 80 0.1 10 100 1 1000 20 0 100 1 10 100 0.1 0.01 1000 4080X TA01b VBAT = 3.8V VOUT = 1.8V L = 10 µH C = 4.7 µF EFFICIENCY (Burst) POWER LOSS (Burst) EFFICIENCY (PWM) POWER LOSS (PWM) Buck Efficiency vs Load Current (VOUT = 1.8V) |
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Similar Description - LTC4080XEMSE-PBF |
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