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LTC4054-4.2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4054-4.2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC4054-4.2/LTC4054X-4.2 405442xf FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT , LTC and LT are registered trademarks of Linear Technology Corporation. s Programmable Charge Current Up to 800mA s No MOSFET, Sense Resistor or Blocking Diode Required s Complete Linear Charger in ThinSOT TM Package for Single Cell Lithium-Ion Batteries s Constant-Current/Constant-Voltage Operation with Thermal Regulation* to Maximize Charge Rate Without Risk of Overheating s Charges Single Cell Li-Ion Batteries Directly from USB Port s Preset 4.2V Charge Voltage with ±1% Accuracy s Charge Current Monitor Output for Gas Gauging* s Automatic Recharge s Charge Status Output Pin s C/10 Charge Termination s 25 µA Supply Current in Shutdown s 2.9V Trickle Charge Threshold (LTC4054) s Available Without Trickle Charge (LTC4054X) s Soft-Start Limits Inrush Current s Available in 5-Lead SOT-23 Package s Cellular Telephones, PDAs, MP3 Players s Charging Docks and Cradles s Bluetooth Applications ThinSOT is a trademark of Linear Technology Corporation. *U.S.Patent No. 6,522,118 The LTC ®4054 is a complete constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the LTC4054 ideally suited for portable applications. Furthermore, the LTC4054 is specifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The LTC4054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LTC4054 automatically enters a low current state, dropping the battery drain current to less than 2 µA. The LTC4054 can be put into shutdown mode, reducing the supply current to 25 µA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. 600mA Single Cell Li-Ion Charger VCC 1.65k 4.2V Li-Ion BATTERY 405442 TA01a LTC4054-4.2 1 µF VIN 4.5V TO 6.5V BAT 4 3 5 2 PROG GND 600mA Complete Charge Cycle (750mAh Battery) TIME (HOURS) 0 1.5 405442 TAO1b 0.5 1.0 2.0 700 600 500 400 300 200 100 0 4.75 4.50 4.25 4.00 3.75 3.50 3.25 3.00 0.25 0.75 1.25 1.75 CONSTANT POWER CONSTANT VOLTAGE CONSTANT CURRENT CHARGE TERMINATED VCC = 5V θJA = 130°C/W RPROG = 1.65k TA = 25°C |
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