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LTC4062EDD Datasheet(PDF) 1 Page - Linear Technology |
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LTC4062EDD Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC4062 1 4062f ■ Charge Current Programmable up to 1A ■ Charges Single Cell Li-Ion Batteries Directly from USB Port ■ Preset Float Voltage with ±0.35% Accuracy ■ Micropower Comparator for Battery Monitoring ■ Thermal Regulation Maximizes Charge Rate Without Risk of Overheating* ■ Programmable Charge Current Detection/ Termination ■ Programmable Charge Termination Timer ■ Smart Pulsing Error Feature ■ SmartStart TM Prolongs Battery Life ■ 20µA Charger Quiescent Current in Shutdown ■ Available in a Low Profile (0.75mm) 10-Lead (3mm × 3mm) DFN Package TYPICAL APPLICATIO FEATURES DESCRIPTIO Standalone Linear Li-Ion Battery Charger with Micropower Comparator APPLICATIO S ■ Handheld Computers ■ Portable MP3 Players ■ Digital Cameras Complete Charge Cycle (1100mAh Battery) , LTC and LT are registered trademarks of Linear Technology Corporation. SmartStart is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protected by U.S. Patents, including 6522118. The LTC ®4062 is a full-featured, flexible, standalone linear charger for single-cell Lithium-Ion batteries. It is capable of operating within USB power specifications. Both programmable time and programmable current based termination schemes are available. Furthermore, the CHRG open-drain status pin can be programmed to indicate the battery charge state according to the needs of the applica- tion. A precise low power comparator is available even with no power applied as long as battery voltage is higher than 2.5V. Additional safety features designed to maxi- mize battery lifetime and reliability include the SmartStart charging algorithm. No external sense resistor or external blocking diode is required for charging due to the internal MOSFET architec- ture. Internal thermal feedback regulates the charge cur- rent to maintain a constant die temperature during high power operation or high ambient temperature conditions. The charge current is programmed with an external resis- tor. With power applied, the LTC4062 can be put into shutdown mode to reduce the supply current to 20µA and the battery drain current to less than 2µA. Without power applied, the internal low power comparator can work sinking only 10µA from the battery. Other features include smart recharge, USB C/5 current programming input and undervoltage lockout. TIME (HOURS) 0 0.5 1.5 2.5 3.0 2.0 900 800 700 600 500 400 300 200 100 0 4.3 4.2 4.1 4.0 3.9 3.8 3.7 3.6 3.5 3.4 4062 TA01b 1.0 BATTERY CURRENT BATTERY VOLTAGE VCC = 5V TA = 25°C 800mA Single Cell Li-Ion Battery Charger (C/10 Termination) + TIMER PROG EN C/5 I OUT BAT VIN 4.3V TO 8V IN+ DET LTC4062 GND 619Ω 100k 715k 347k 800mA 1µF 4062 TA01 SINGLE CELL Li-Ion BATTERY VCC BAT > 3V BAT < 3V |
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