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LTC4069 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4069 Datasheet(HTML) 1 Page - Linear Technology |
1 / 18 page LTC4069 1 4069fc For more information www.linear.com/LTC4069 Typical applicaTion DescripTion Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN with NTC Thermistor Input The LTC®4069 is a complete constant-current/con- stant-voltage linear charger for single-cell lithium-ion batteries. The 2mm × 2mm DFN package and low external componentcountmaketheLTC4069especiallywell-suited for portable applications. Furthermore, LTC4069 is specif- ically 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 manufacturer specifications. No external sense resistor or blocking diode is required due to the internal MOSFET architecture. Thermal feed- back regulates charge current to limit the die temperature during high power operation or high ambient temperature conditions. When the input supply (wall adapter or USB supply) is removed, the LTC4069 automatically enters a low current state, dropping battery drain current to less than 1µA. With power applied, LTC4069 can be put into shutdown mode, reducing the supply current to less than 20µA. The LTC4069 also includes automatic recharge, low-bat- tery charge conditioning (trickle charging), soft-start (to limit inrush current) and an NTC thermistor input used to monitor battery temperature. The LTC4069 is available in a tiny 6-lead, low profile (0.75mm) 2mm × 2mm DFN package. FeaTures applicaTions n Complete Linear Charger in 2mm × 2mm DFN Package n C/10 Charge Current Detection Output n Timer Charge Termination n ChargeCurrentProgrammableUpto750mAwith 5% Accuracy n NoExternalMOSFET,SenseResistororBlocking Diode Required n NTC Thermistor Input for Temperature Qualified Charging n Preset 4.2V Float Voltage with 0.6% Accuracy n Constant-Current/Constant-VoltageOperationwith Thermal Feedback to Maximize Charge 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 Soft-Start Limits Inrush Current n Tiny 6-Lead (2mm × 2mm) DFN Package n Wireless PDAs n Cellular Phones n Portable Electronics Standalone Li-Ion Battery Charger + VCC R1 510 500mA RPROG 2k 4069 TA01 4.2V Li-Ion BATTERY VIN 4.3V TO 5.5V 1µF LTC4069 CHRG NTC BAT PROG GND RNOM 100k RNTC 100k TIME (HOURS) 0 200 400 600 100 300 500 1 2 3 4 4069 TA01b 3.00 3.50 4.00 4.50 3.25 3.75 4.25 5 0.5 0 1.5 2.5 3.5 4.5 CONSTANT CURRENT CONSTANT VOLTAGE VCC = 5V RPROG = 2k CHRG TRANSITION CHARGE TERMINATION Complete Charge Cycle (1100mAh Battery) 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. |
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