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LTC4066-1 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4066-1 Datasheet(HTML) 1 Page - Linear Technology |
1 / 28 page LTC4066/LTC4066-1 1 4066fc TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode The LTC ®4066/LTC4066-1 are USB power managers and Li-Ion battery chargers designed to work in portable battery-powered applications. The parts control the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 100mA, 500mA or “unlimited” (i.e., above 2A). Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit. The LTC4066/LTC4066-1 include a standalone constant- current/constant-voltage linear charger for single cell Li-ion batteries. 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. A programmable end-of-charge status output (CHRG) indicates full charge. BAT pin charge and discharge cur- rents can be monitored via an analog output (ISTAT). 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 bat- tery temperature while charging. The LTC4066/LTC4066-1 are available in a 24-pin thin profile (0.75mm) 4mm ×4mmQFNpackage.TheLTC4066 is also available in a 24-pin ultrathin profile (0.55mm) 4mm × 4mm UTQFN package. n Portable USB Devices n GPS, Cameras, Broadband Wireless Modems n Mulitple Input Chargers 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. n Seamless Transition Between Input Power Sources: Li-Ion Battery, USB and 5V Wall Adapter n Low Loss (50mΩ) Ideal Diode Path from BAT to OUT n Programmable Charge Current Detection (CHRG) n Load Dependent Charging Guarantees USB Input Current Compliance n Analog Gas Gauge Function n Charges Single Cell Li-Ion Batteries Directly from USB Port n Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating* n Selectable 100% or 20% Current Limit (e.g., 500mA/100mA) n Termination Timer Adapts to Actual Charge Current n Preset 4.2V Charge Voltage with 0.8% Accuracy (4.1V for LTC4066-1) n NTC Thermistor Input for Temperature Qualified Charging n Thin Profile (0.75mm) 24-Lead 4mm × 4mm QFN Package n Ultrathin Profile (0.55mm) 24-Lead 4mm × 4mm UTQFN Package (LTC4066 Only) + IN VNTC NTC WALL SHDN SUSP HPWR CLDIS OUT 4.7μF 510Ω TO ADC FOR GAS GAUGE 510Ω 4.7μF TIMER PROG LTC4066 CLPROG GND 4066 TA01 TO LDOs, REGs, ETC BAT CHRG ACPR POL ISTAT 0.1μF 100k 2k SUSPEND USB POWER 500mA/100mA SELECT 5V (NOM) FROM USB CABLE VBUS 2k INPUT CURRENT LIMIT DISABLE ILOAD (mA) 0 300 400 600 500 IIN 400 4066 TA02 200 100 –100 0 100 200 300 600 500 IBAT CHARGING ILOAD IBAT (IDEAL DIODE) |
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