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LTC4065 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4065 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC4065/LTC4065A 4065fb ■ Wireless PDAs ■ Cellular Phones ■ Portable Electronics Standalone 750mA Li-Ion Battery Charger in 2 × 2 DFN ■ Complete Linear Charger in 2mm ××××× 2mm DFN Package ■ C/10 Charge Current Detection Output ■ Timer Termination ■ Charge Current Programmable up to 750mA with 5% Accuracy ■ No External MOSFET, Sense Resistor or Blocking Diode Required ■ Preset 4.2V Float Voltage with 0.6% Accuracy ■ Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating ■ ACPR Pin Indicates Presence of Input Supply (LTC4065A Only) ■ Charge Current Monitor Output for Gas Gauging ■ Automatic Recharge ■ Charges Single Cell Li-Ion Batteries Directly from USB Port ■ 20 µA Supply Current in Shutdown Mode ■ Soft-Start Limits Inrush Current ■ Tiny 6-Lead (2mm × 2mm) DFN Package FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO + VCC R1 510 Ω R2* 1 Ω 500mA R3 2k 4065 TA01 4.2V Li-Ion BATTERY VIN 4.3V TO 5.5V C1 1 µF *SERIES 1 Ω RESISTOR ONLY NEEDED FOR INDUCTIVE INPUT SUPPLIES LTC4065 CHRG EN BAT PROG GND The LTC ®4065 is a complete constant-current/constant- voltage linear charger for single-cell lithium-ion batteries. Its 2mm ×2mmDFNpackageandlowexternalcomponent count make the LTC4065 especially well-suited for por- table applications. Furthermore, LTC4065 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. 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 LTC4065 automatically enters a low current state, dropping battery drain current to less than 1 µA.With power applied, LTC4065 can be put into shutdown mode, reducing the supply current to less than 20 µA. The full-featured LTC4065 also includes automatic re- charge, low-battery charge conditioning (trickle charg- ing), soft-start (to limit inrush current) and an open-drain status pin to indicate the presence of an adequate input voltage (LTC4065A only). The LTC4065 is available in a tiny 6-lead, low profile (0.75mm) 2mm × 2mm DFN package. Standalone Li-Ion Battery Charger , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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