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LTC4054LES5-4.2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4054LES5-4.2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC4054L-4.2 4054l42f 150mA Standalone Linear Li-Ion Battery Charger in ThinSOT , LTC and LT are registered trademarks of Linear Technology Corporation. s Programmable Charge Current Range: 10mA to 150mA s No External MOSFET, Sense Resistor or Blocking Diode Required s Complete Linear Charger in ThinSOT TM Package for Single Cell/Coin 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 Max Supply Current in Shutdown Mode s 2.9V Trickle Charge Threshold s Soft-Start Limits Inrush Current s Available in a 6-Lead Low Profile (1mm) SOT-23 Package s Charger for Li-Ion Coin Cell Batteries s Portable MP3 Players, Wireless Headsets s Bluetooth Applications s Multifunction Wristwatches ThinSOT is a trademark of Linear Technology Corporation. *U.S. Patent No. 6,522,118 The LTC ®4054L is a complete, constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its small size and ability to regulate low charge currents make the LTC4054L especially well-suited for portable applications using low capacity rechargeable lithium-ion coin cells. Furthermore, the LTC4054L is specifically de- signed to work within USB power specifications. No external sense resistor is needed, and no blocking di- ode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to eliminate thermal overdesign. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The LTC4054L automatically terminates a 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 LTC4054L automatically enters a low cur- rent state, dropping the battery drain current to less than 2 µA. The LTC4054L can be put into shutdown mode, re- ducing 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. VCC 1.69k 4.2V COIN CELL Li-Ion BATTERY 4054l42 TA01 LTC4054L-4.2 1 µF VIN 4.5V TO 6.5V BAT 4 3 90mA 5 2 PROG GND 90mA Li-Ion Single Coin Cell Charger TIME (HOURS) 0 100 90 80 70 60 50 40 30 20 10 0 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 0.5 1.0 1.25 2.25 4054l42 TA01b 0.25 0.75 1.5 1.75 2.0 CONSTANT CURRENT CONSTANT VOLTAGE VCC = 5V θJA = 130°C/W RPROG = 1.69k TA = 25°C Complete Charge Cycle (130mAh Battery) FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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