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LTC4057 Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LTC4057 Datasheet(HTML) 1 Page - Linear Integrated Systems |
1 / 18 page LTC4065L/ LTC4065LX/LTC4065L-4.1 1 4065lfb TYPICAL APPLICATION FEATURES DESCRIPTION Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN The LTC®4065L is a complete constant-current/constant- voltage linear charger for single-cell lithium-ion batteries. Its small size and ability to accurately regulate low charge currents make the LTC4065L especially well-suited for portable applications using low capacity rechargeable lithium-ion cells. Furthermore, LTC4065L is specifically designed to work within USB power specifications. The CHRG pin indicates when charge current has dropped to ten percent of its programmed value (C/10). An internal timer terminates charging according to battery manufac- turer specifications. The LTC4065L-4.1 features a constant-voltage float voltage of 4.1V. This 4.1V version of the standard LTC4065L is in- tendedforback-uporhighambienttemperatureapplications. Under these conditions, a reduced float voltage will trade- off initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells. When the input supply (wall adapter or USB supply) is removed, the LTC4065L automatically enters a low current state, dropping battery drain current to less than 1μA. With power applied, LTC4065L can be put into shutdown mode, reducing the supply current to less than 20μA. The full-featured LTC4065L also includes automatic re- charge, low-battery charge conditioning (trickle charging) and soft-start (to limit inrush current). Standalone Li-Ion Battery Charger Complete Charge Cycle (180mAh Battery) LTC4065L and LTC4065LX APPLICATIONS n Charge Current Programmable up to 250mA with 5% Accuracy n Complete Linear Charger in 2mm × 2mm DFN Package n C/10 Charge Current Detection Output n Timer Termination n No External MOSFET, Sense Resistor or Blocking Diode Required n Preset Float Voltage with 0.6% Accuracy: 4.2V for LTC4065L/LTC4065LX 4.1V for LTC4065L-4.1 n Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating n Charge Current Monitor Output for Gas Gauging n Automatic Recharge n Charges Single Cell Li-Ion Batteries Directly from USB Port n 20μA Supply Current in Shutdown Mode n Available Without Trickle Charge (LTC4065LX) n Tiny 6-Lead (2mm × 2mm) DFN Package n Charger for Li-Ion Coin Cell Batteries n Portable MP3 Players, Wireless Headsets n Bluetooth Applications n Multifunction Wristwatches L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364. + VCC R1 510Ω 100mA R3 2k 4065L TA01 4.2V Li-Ion BATTERY VIN 4.3V TO 5.5V C1 1μF LTC4065L CHRG EN BAT PROG GND TIME (HOURS) 0 30 90 100 110 1 2 2.5 4065 TA02 10 70 50 20 80 0 60 40 4.3 3.5 4.1 3.3 3.9 3.7 0.5 1.5 3 3.5 4 4.5 CONSTANT CURRENT CONSTANT VOLTAGE CHRG TRANSITION CHARGE TERMINATION VCC = 5V RPROG = 2k |
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