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AAT3680 Datasheet(PDF) 5 Page - Advanced Analog Technology, Inc. |
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AAT3680 Datasheet(HTML) 5 Page - Advanced Analog Technology, Inc. |
5 / 18 page AAT3680 Lithium-Ion/Polymer Linear Battery Charge Controller 3680.2006.03.1.6 5 Functional Block Diagram LED Signal Generator MUX Microcontroller Status Generator Microcontroller Read Enable Charge Status Logic Control Power-On Reset CSI VP STAT T2X DRV VSS Under- Voltage Lock Out Over-Current / Short-Circuit Protection 2x Trickle Charge Control Loop Select MUX Driver BAT TS VREF Temperature Sense Comparator Voltage Comparator Current Loop Error Amp Voltage Loop Error Amp Functional Description The AAT3680 is a linear charge controller designed for single-cell lithium-ion/polymer batteries. It is a full-featured battery management system IC with multiple levels of integrated power savings, system communication, and protection. Refer to the block diagram (above) and flow chart (Figure 1) in this section for details. Cell Preconditioning Before the start of charging, the AAT3680 checks several conditions in order to maintain a safe charg- ing environment. The input supply must be above the minimum operating voltage, or under-voltage lockout threshold (V UVLO), for the charging sequence to begin. Also, the cell temperature, as reported by a thermistor connected to the TS pin, must be within the proper window for safe charging. When these conditions have been met and a bat- tery is connected to the BAT pin, the AAT3680 checks the state of the battery. If the cell voltage is below V MIN, the AAT3680 begins preconditioning the cell. This is performed by charging the cell with 10% of the programmed constant current. For example, if the programmed charge current is 500mA, then the preconditioning mode (trickle charge) current will be 50mA. Cell preconditioning is a safety precaution for deeply discharged cells and, furthermore, limits power dissipation in the pass transistor when the voltage across the device is largest. The AAT3680 features an optional T2X mode, which allows faster trickle charging at approximately two times the default rate. This mode is selected by connecting the T2X pin to V SS. If an over-temperature fault is triggered, the fast trickle charge will be latched off, and the AAT3680 will continue at the default 10% charge current. Constant Current Charging Cell preconditioning continues until the voltage on the BAT pin reaches V MIN. At this point, the AAT3680 begins constant current charging (fast charging). Current level for this mode is pro- grammed using a current sense resistor R SENSE between the VP and CSI pins. The CSI pin moni- tors the voltage across R SENSE to provide feedback for the current control loop. The AAT3680 remains in constant current charge mode until the battery reaches the voltage regulation point, V CH. |
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