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LTC4055 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4055 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page 1 LTC4055 4055p USB Power Controller and Li-Ion Linear Charger s Charges Single Cell Li-Ion Batteries Directly from USB Port s Load Dependent Charging Guarantees USB Input Current Compliance s Automatic Battery Switchover When Input Supply is Removed s Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating s Selectable 100% or 20% Current Limit (e.g., 500mA/100mA) s Low Loss Full PowerPath TM Control with Ideal Diode Operation (Reverse Current Blocking) s Preset 4.2V Charge Voltage with 0.8% Accuracy s USB Compliant Suspend Mode s Programmable Charge Current and Termination Timer s Automatic Recharge s Soft-Start Limits Inrush Current s NTC Thermistor Input for Temperature Qualified Charging s Tiny (4mm × 4mm × 0.8mm) QFN Package The LTC ®4055 is a USB power manager and Li-Ion battery charger designed to work in portable battery-powered applications. The part manages and limits the total current used by the USB peripheral for operation and battery charging. Depending on the state of the current select pin (HPWR), total input current can be limited to either 100mA or 500mA. The voltage drop from the USB supply or battery to the USB peripheral is typically less than 100mV at 400mA and 20mV at 80mA. Other management features include: automatic switch over to battery when input is removed, inrush current limiting, reverse current block- ing, undervoltage lockout and thermal shutdown. The LTC4055 includes a complete constant-current/con- stant-voltage linear charger for single cell Li-ion batteries. The float voltage applied to the battery is held to a tight 0.8% (typ) tolerance, and charge current is programmable using an external resistor to ground. Fully discharged cells are automatically trickle charged at 10% of the pro- grammed current until the cell voltage exceeds 2.8V. 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 temperature while charging. The LTC4055 is available in a 16-pin low profile (4mm × 4mm) QFN package. s Portable USB Devices: Cameras, MP3 Players, PDAs , LTC and LT are registered trademarks of Linear Technology Corporation. PowerPath is a trademark of Linear Technology Corporation. + IN1 IN2 VNTC NTC WALL SHDN SUSP HPWR OUT Li-Ion CELL 10 µF 1 Ω 10 µF TIMER PROG LTC4055 CLPROG GND 4055 TA01 TO LDOs, REGs, ETC BAT CHRG ACPR 0.1 µF 100k 100k SUSPEND USB POWER 500mA/100mA SELECT 5V (NOM) FROM USB CABLE VBUS ILOAD (mA) 0 300 400 600 500 IIN 400 4055 TA02 200 100 –100 0 100 200 300 600 IBAT (IDEAL DIODE) 500 IBAT CHARGING ILOAD High Power/Full Charge RPROG = RCLPROG = 100k FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Electrical Specifications Subject to Change |
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