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AAT3697 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT3697 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 22 page  AAT3697 2A Lithium-Ion/Polymer Battery Charger 3697.2007.02.1.1 9 Functional Block Diagram Charge Control Reverse Blocking CV/ Precharge Constant Current Current Compare ADP BAT ADPSET UVLO Over- Temperature Protection Charge Status STAT2 STAT1 4.2V Serial Data DATA Watchdog Timer CT Voltage Sense ADPP# EN GND IC enable TS Functional Description The AAT3697 is a highly integrated single-cell lithi- um-ion/polymer battery charger IC designed to operate with standard AC adapter input sources, while requiring a minimum number of external components. The AAT3697 precisely regulates battery charge voltage and current for 4.2V lithium- ion/polymer battery cells. The adapter charge input constant current level can be programmed up to 2.0A for rapid charging applications. The AAT3697 is rated for operation from -40°C to +85°C. In the event of operating ambient temperatures exceeding the power dissi- pation abilities of the device package for a given constant current charge level, the charge control will enter into thermal regulation. When the system thermal regulation becomes active, the pro- grammed constant current charge amplitude will be automatically reduced to a safe level for the cur- rent operating condition. Should the ambient oper- ating temperature drop below the thermal loop threshold, the system will automatically resume charging at the full programmed constant current level. This intelligent thermal management system permits the AAT3697 to operate and safely charge a battery cell over a wide range of ambient condi- tions while maximizing the greatest possible charge current for the given set of conditions. Status monitor output pins are provided to indicate the battery charge state by directly driving two external LEDs. A serial interface output is also available to report any one of 12 distinct charge states to the system microcontroller. Battery temperature and charge state are fully monitored for fault conditions. In the event of an over-voltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the bat- tery under charge. In addition to internal charge controller thermal protection, the AAT3697 also provides a temperature sense feedback function (TS pin) from the battery to shut down the device in the event the battery exceeds its own thermal limit during charging. All fault events are reported to the user either by the simple status LEDs or via the DATA pin function. |
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