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AAT3683IOQ-4.2-3-T1 Datasheet(PDF) 11 Page - Advanced Analogic Technologies |
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AAT3683IOQ-4.2-3-T1 Datasheet(HTML) 11 Page - Advanced Analogic Technologies |
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11 / 24 page  AAT3683 1A Linear Li-Ion Battery Charger 3683.2007.06.1.0 11 tally controlled thermal loop system that will reduce the charging current to prevent the device from thermal shutdown. The digital thermal loop will maintain the maximum possible battery charging current for the 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 current as operating conditions change. The digital thermal loop will reset and resume nor- mal operation when the power dissipation or over- temperature conditions are removed. Battery Charging Operation Figure 1 illustrates the entire battery charging pro- file or operation, which consists of three phases: 1. Preconditioning (Trickle) Charge 2. Constant Current Charge 3. Constant Voltage Charge Battery Preconditioning Battery charging commences only after the AAT3683 checks several conditions in order to maintain a safe charging environment. The input supply must be above the minimum operating volt- age (V UVLO) and the enable pin must be high. When the battery is connected to the BAT pin, the AAT3683 checks the condition of the battery and determines which charging mode to apply. If the battery voltage is below the preconditioning voltage threshold, V MIN, then the AAT3683 begins precon- ditioning the battery cell (trickle charging) by charg- ing at 10% of the programmed constant current. For example, if the programmed current is 500mA, then the preconditioning mode (trickle charge) cur- rent is 50mA. Battery cell preconditioning (trickle charging) is a safety precaution for deeply dis- charged cells and will also reduce the power dissi- pation in the internal series pass MOSFET when the input-output voltage differential is at the great- est potential. Constant Current Charging Battery cell preconditioning continues until the bat- tery voltage reaches the preconditioning voltage threshold, V MIN. At this point, the AAT3683 begins constant current charging. The current level for this mode is programmed using a single resistor from the ISET pin to ground. Programmed current can be set at a minimum 100mA up to a maximum of 1A. Constant Voltage Charging Constant current charging will continue until such time that the battery voltage reaches the voltage regulation point, V BAT_EOC. When the battery volt- age reaches V BAT_EOC, the AAT3683 will transition to constant voltage mode. The regulation voltage is factory programmed to a nominal 4.2V and will continue charging until the charge termination cur- rent is reached. Figure 1: Current vs. Voltage Profile During Charging Phases. Constant Current Charge Phase Constant Voltage Charge Phase Preconditioning Trickle Charge Phase Charge Complete Voltage Constant Current Mode Voltage Threshold Regulated Current Trickle Charge and Termination Threshold I = CC / 10 I = Max CC |
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