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LTC4065A Datasheet(PDF) 1 Page - Linear Technology |
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LTC4065A Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LTC4085 1 4085fd USB Power Manager with Ideal Diode Controller and Li-Ion Charger The LTC®4085 is a USB power manager and Li-Ion battery charger designed for portable battery-powered applica- tions. The part controls the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 20% or 100% of a pro- grammed value up to 1.5A (typically 100mA or 500mA). Battery charge current is automatically reduced such that the sum of the load current and charge current does not exceed the programmed input current limit. The LTC4085 includes a complete constant-current/ constant-voltage linear charger for single cell Li-ion bat- teries. The float voltage applied to the battery is held to a tight 0.8% tolerance, and charge current is programmable using an external resistor to ground. An end-of-charge status output CHRG indicates full charge. Total charge time is programmable by an external capacitor to ground. When the battery drops 100mV below the float voltage, automatic recharging of the battery occurs. Also featured is an NTC thermistor input used to monitor battery tem- perature while charging. The LTC4085 is available in a 14-lead low profile 4mm × 3mm DFN package. n Portable USB Devices: Cameras, MP3 Players, PDAs n Seamless Transition Between Input Power Sources: Li-Ion Battery, USB and 5V Wall Adapter n 215mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provide Low Loss PowerPath ™ When Wall Adapter/USB Input Not Present n Load Dependent Charging Guarantees Accurate USB Input Current Compliance n Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating* n Selectable 100% or 20% Input Current Limit (e.g., 500mA/100mA) n Battery Charge Current Independently Programmable Up to 1.2A n Preset 4.2V Charge Voltage with 0.8% Accuracy n C/10 Charge Current Detection Output n NTC Thermistor Input for Temperature Qualified Charging n Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package Input and Battery Current vs Load Current RPROG = 100k, RCLPROG = 2k L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118,6700364. Other patents pending. IN SUSP HPWR PROG CLPROG NTC VNTC WALL ACPR OUT GATE BAT CHRG TIMER LTC4085 GND + 0.1μF 4.7μF TO LDOs, REGs, ETC 10k 10k 2k 100k 4.7μF 5V WALL ADAPTER INPUT 5V (NOM) FROM USB CABLE VBUS SUSPEND USB POWER 100mA 500mA SELECT 1k 510Ω 4085 TA01 * * OPTIONAL - TO LOWER IDEAL DIODE IMPEDANCE IIN ILOAD IBAT ILOAD (mA) 0 600 500 400 300 200 100 0 –100 300 500 4085 TA01b 100 200 400 600 ILOAD IIN IBAT (CHARGING) IBAT (DISCHARGING) WALL = 0V FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION |
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