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LTC4067EDE Datasheet(PDF) 1 Page - Linear Technology |
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LTC4067EDE Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC4067 1 4067f USB Power Manager with OVP and Li-Ion/Polymer Charger The LTC®4067 is a USB power management and Li-Ion/ Polymer battery charger designed for portable battery powered applications. The part controls total current used by the USB peripheral for operation and battery charging. The total input current may be left unregulated, or it may be limited to 20% or 100% of the programmed value up to 1.5A (typically 500mA). Battery charge current is au- tomatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current. With the addition of an external P-channel MOSFET the LTC4067 can withstand voltages up to 13V. The LTC4067 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 0.4% tolerance, and charge current is programmed using an external resistor to ground. An end-of-charge status output, ⎯C⎯H⎯R⎯G, indicates full charge. Also featured is an NTC thermistor input used to monitor battery temperature while charging. The LTC4067 is available in a 12-lead low profile 4mm × 3mm DFN package. Programmable Input Current Limit: ■ Single Resistor at CLPROG Pin to Set and Monitor Input Current Battery Charger/Ideal Diode/Controller: ■ 13V Overvoltage Protection ■ Full Featured Battery Charger with 4.2V Float ■ Up to 1.25A Programmable Charge Current ■ Thermal Regulation Maximizes Charge Current Without Risk of Overheating ■ Internal 2 Hour Termination Timer from Onset of Voltage Mode Charging ■ Automatic Load Switchover to Battery Power with Internal Ideal Diode and Drive Output for Optional External MOSFET ■ NTC Thermistor Input ■ Bad Battery Time-Out Detection ■ 4mm × 3mm 12-Lead DFN Package FEATURES DESCRIPTIO TYPICAL APPLICATIO , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Automatic Battery Charging/Load Switchover ■ Backup Battery Charger ■ Uninterrupted Supplies APPLICATIO S 2k 10 μF LTC4067 OVI OUT OVP 1-CELL Li-Ion ILOAD 2k IN BAT ILIM0 PROG ILIM1 CLPROG GND WALL OR USB 10 μF 10nF 1 μF 4067 TA01 CHRG ILIM0 ILIM1 IIN(MAX) L L H H H L H L O (SUSPEND) 200V/RCLPROG 1000V/RCLPROG FIXED (2A) 4067 TA01b 1ms/DIV VOVP 5V/DIV VOUT 5V/DIV IIN 500mA/DIV VOVI 5V/DIV 5V TO 12V VBAT = 4.2V OVP Response to Ramp Input at OVI |
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