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AAT3689IWP-4.2-T1 Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT3689IWP-4.2-T1 Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
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10 / 20 page  Functional Block Diagram Charge Control Current Compare Reverse Blocking Reverse Blocking CV/ Precharge USB Constant Current Current Compare ADP BAT ADPSET UVLO Over- Temperature Protection Charge Status STAT2 STAT1 TS Window Comparator 80uA USBSET Watchdog Timer CT GND Voltage Sense EN IC Enable AAT3689 0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger 10 3689.2006.11.1.0 Functional Description The AAT3689 is a highly integrated single cell lithi- um-ion/polymer battery charger IC designed to operate with USB port and AC adapter inputs, while requiring a minimum number of external components. The AAT3689 precisely regulates battery charge voltage and current for 4.2V lithium- ion/polymer battery cells. The adapter charge input constant current level may be programmed up to 1.0A for rapid charging applications. In the absence of a high current adapter input source, the AAT3689 may be pow- ered from a USB port VBUS supply. The USB con- stant charge current can be externally pro- grammed for maximum constant current charge levels up to 500mA. The USB charge function is automatically disabled when an adapter input power source greater than 4.5V is present. Status monitor output pins are provided to indicate the battery charge status by directly driving two external LEDs. Battery temperature and charge state are fully mon- itored for fault conditions. In the event of an over- voltage or over-temperature failure, the device will automatically shut down, thus protecting the charg- ing device, control system, and the battery under charge. In addition to internal charge controller ther- mal protection, the AAT3689 also provides a tem- perature sense feedback function (TS pin) from the battery to shut down the device in the event the bat- tery exceeds its own thermal limit during charging. Charging Operation Regardless of which charge input function is select- ed (i.e., either the adapter input or USB input), the AAT3689 has four basic modes for the battery charge cycle: pre-conditioning/trickle charge; con- stant current/fast charge; constant voltage; and end of charge (see Figure 1). |
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