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AAT3680 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT3680 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 18 page  Protection Circuitry The AAT3680 is truly a highly integrated battery management system IC including several protection features. In addition to battery temperature monitor- ing, the IC constantly monitors for over-current and over-voltage conditions; if an over-current situation occurs, the AAT3680 latches off the pass device to prevent damage to the battery or the system, and enters shutdown mode until the over-current event is terminated. An over voltage condition is defined as a condition where the voltage on the BAT pin exceeds the max- imum battery charge voltage. If an over-voltage con- dition occurs, the IC turns off the pass device until voltage on the BAT pin drops below the maximum battery charge constant voltage threshold. The AAT3680 will resume normal operation after the over-current or over voltage condition is removed. During an over-current or over-voltage event, the STAT will report a FAULT signal. In the event of a battery over-temperature condition, the IC will turn off the pass device and report a FAULT signal on the STAT pin. After the system recovers from a temperature fault, the IC will resume operation in the 1X trickle charge mode to prevent damage to the system in the event a defective bat- tery is placed under charge. Once the battery volt- age rises above the trickle charge to constant cur- rent charge threshold, the IC will resume the con- stant current mode. AAT3680 Lithium-Ion Linear Battery Charge Controller 3680.2003.4.0.91 9 High Speed Data Reporting Application Schematic Q1 FZT788B AAT3680 C2 10 µF C1 4.7 µF R2 100k RSENSE 0.2 R1 2.5k BATT+ BATT- TEMP RT1 RT2 VP VP Battery Pack DRV CSI VP VSS STAT TS BAT TX2 STAT C3 0.1 µF 100k Figure 4: Typical Charge Profile Preconditioning (Trickle Charge) Phase Constant Current Phase Constant Voltage Phase Output Charge Voltage (VCH) Preconditioning Voltage Threshold (VMIN) Regulation Current (ICHARGE(REG)) Trickle Charge and Termination Threshold |
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