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LTC4057-4.2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4057-4.2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LTC4057-4.2 1 4057f s Programmable Charge Current up to 800mA s No External MOSFET, Sense Resistor or Blocking Diode Required s Constant-Current/Constant-Voltage Operation with Thermal Regulation Maximizes 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 Current Monitor Pin for Charge Termination s 25 µA Supply Current in Shutdown Mode s Low Battery Charge Conditioning (Trickle Charging) s Soft-Start Limits Inrush Current s Available in a Low Profile (1mm) SOT-23 Package FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT , LTC and LT are registered trademarks of Linear Technology Corporation. s Wireless PDAs s Cellular Phones s Portable Electronics The LTC ®4057 is a constant-current/constant-voltage lin- ear charger for single-cell lithium-ion batteries. Its ThinSOT TM package and low external component count make the LTC4057 especially well suited for portable applications. Furthermore, the LTC4057 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 prevents overheating by regulating the charge current to limit the die temperature during high power operation or high ambient temperature conditions. The charge voltage is preset at 4.2V and the charge current can be programmed externally with a single resistor. When the input supply (wall adapter or USB supply) is removed, the LTC4057 automatically enters a low current state, dropping the battery drain current to less than 2 µA. With power applied, the LTC4057 can be put into shut- down mode, reducing the supply current to 25 µA. For the standalone version (on-board charge termination) of the LTC4057, refer to the LTC4054. Charge Curve (750mAh Battery) LTC4057-4.2 PROG GND 1.65k 4057 TA01a SHDN BAT VCC ON OFF 1 µF VIN 5V 600mA 1-CELL 4.2V Li-Ion BATTERY + 4 1 2 5 3 ThinSOT is a trademark of Linear Technology Corporation. *U.S. Patent No. 6522118 TIME (HOURS) 0 700 600 500 400 300 200 100 0 4.75 4.5 4.25 4.0 3.75 3.5 3.25 3.0 4057 TA01b 0.5 0.25 0.75 1.0 1.25 1.5 1.75 2.0 2.25 CONSTANT CURRENT CONSTANT POWER CONSTANT VOLTAGE VCC = 5V θJA = 130°C/W RPROG = 1.65kΩ TA = 25°C |
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