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AAT3663 데이터시트(PDF) 10 Page - Advanced Analogic Technologies |
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AAT3663 데이터시트(HTML) 10 Page - Advanced Analogic Technologies |
10 / 22 page Functional Block Diagram Charge Control Current Compare Reverse Blocking CV/ Precharge Constant Current IN BAT ISET UVLO Over-Temp Protect Power Detection STAT 1 GND EN Thermal Loop ADPP# Charge Status BATS CT TS STAT 2 Watchdog Timer TERM 75μA AAT3663-2 Only Window Comparator AAT3663 1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications 10 3663.2007.10.1.0 Functional Description The AAT3663 is a high performance battery charger designed to charge single/dual cell Lithium-Ion or Lithium-Polymer batteries with up to 1000mA of current from an external power source. It is a highly integrated stand-alone charging solution, with the least external components required for complete functionality. The AAT3663 precisely regulates end of charge bat- tery voltage and current for single cell 4.2V and dual cell 8.4V lithium-ion/polymer battery with a program- mable constant current range from 100mA to 1A for fast charging applications. The system has a default charge termination current set to 10 percent of the pro- grammed fast charge constant. The charge termina- tion current may also be user programmed by an external resistor. During battery charging, the device temperature will rise. In some cases with adapter (ADP) charging, the power dissipation in the charge regulation pass device may cause the junction temperature to rise and approach the internal thermal shutdown threshold. Excessive power dissipation is caused by the high input adapter voltage versus the low output battery cell voltage difference at a given constant charge current. In the event of an internal over-temperature condition caused by excessive ambient operating temperature or excessive power dissipation conditions, the AAT3663 enables a digitally controlled thermal loop system that will reduce the charging current to prevent thermal shutdown. The digital thermal loop will main- tain the maximum possible battery charging current for a given set of input to output power dissipation and ambient temperature conditions. The digital thermal loop control is dynamic in the sense that it will continue to adjust the battery charging cur- rent as operating conditions change. The digital ther- mal loop will reset and resume normal operation when the power dissipation or over-temperature conditions are removed. In the event of an over-voltage, over-current or over- temperature false condition beyond the limits of the digital thermal loop system, the device will automati- cally shut down, thus protecting the charging device, control system, and the battery under charge. AAT3663 provides two status monitor pins, STAT1 and STAT2. These pins are open drain MOSFET switches intended to directly drive external LEDs to indicate the battery charging state. A third status pin is prided to |
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