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LTC4080 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4080 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 20 page  LTC4080 1 4080fb ■ 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 The LTC4080 is a complete constant-current/constant- voltage linear battery charger for a single-cell 4.2V lithium-ion battery with an integrated 300mA synchron- ous buck converter. The small packages and low external component count make the LTC4080 especially suitable for portable applications. Furthermore, LTC4080 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 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 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 LTC4080 is available in 10-lead, low profile (0.75 mm) 3mm × 3mm DFN and MSOP Exposed Pad packages. ■ Complete Linear Battery Charger with Integrated Buck Converter 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 ■ 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, LTM and Burst Mode are registered trademarks 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 BATTERY CBAT 4.7 μF RPROG 806 Ω R2 806k COUT 4.7 μF 4080 TA01a CPL 10pF R1 1M LTC4080 EN_CHRG EN_BUCK MODE SW FB PROG VCC BAT VOUT (1.8V/300mA) L1, 1O μH GND CIN 4.7 μF VCC (3.75V to 5.5V) + LOAD CURRENT (mA) 0.01 40 60 80 0.1 10 100 11000 20 0 100 0 10 100 0.1 0.01 1000 4080 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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