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AAT3663IWO-4.2-1-T1 Datasheet(PDF) 11 Page - Advanced Analogic Technologies |
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AAT3663IWO-4.2-1-T1 Datasheet(HTML) 11 Page - Advanced Analogic Technologies |
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11 / 22 page  indicate the presence of power on the input supply pin. This open drain MOSFET switch may be used to either power a display LED or to alert a system microcon- troller for the presence on input power. Battery Charging Operation Figure 1 illustrates the entire battery charging profile and operation, which consists of three phases: 1. Preconditioning (Trickle) Charge 2. Constant Current Charge 3. Constant Voltage Charge When power is initially applied or when a battery pack is connected to the BAT pin, battery charging com- mences after the AAT3663 checks several conditions in order to maintain a safe charging environment. The input supply must be above the minimum operating voltage (UVLO) and the enable pin must be high (inter- nally pulled down). When the battery is connected to the BAT pin the AAT3663 checks the condition of the battery and determines which charging mode to apply. Battery Preconditioning If the battery voltage is below V MIN, the AAT3663 begins battery trickle charging by charging at 10% of the pro- grammed constant-current. For example, if the pro- grammed current is 500mA, then the trickle charge cur- rent is 50mA. Trickle charging is a recommended safe- ty precaution for a deeply discharged cell and maxi- mizes the charge cycle life of the battery. In addition, charger IC power dissipation for the internal series pass MOSFET is minimized when the input-output voltage differential is at its highest. This in turn allows the charging operation to commence over wider thermal and input to output voltage differential conditions. Constant Current Charging Trickle charging continues until the battery voltage reaches the V MIN threshold. At this point, the AAT3663 begins constant-current fast charging. The current level for this mode is programmed using a single resis- tor from the ISET pin to ground. Programmed current can be set at a minimum 100mA up to a maximum 1A. Constant Voltage Charging Constant current charging continues until such time that the battery voltage reaches the voltage regulation point V BAT_REG. When the battery voltage reaches V BAT_REG, the AAT3663 will transition to the constant- voltage mode. The regulation voltage is factory pro- grammed to a nominal 4.2V for the AAT3663-4.2 option and to 8.4V for the AAT3663-8.4 option. Under default conditions with the TERM pin not connected (open circuit), constant voltage charging will continue until the charge current has reduced to 10% of the pro- grammed current. Placing a resistor between the TERM pin and ground allows the user to program a desired termination current. After the charge cycle is complete, the AAT3663 turns off the series pass device and automatically goes into a power saving sleep mode. During this time the series pass device will block current in both directions there- fore preventing the battery discharging through the IC. The AAT3663 will remain in sleep mode, until either the battery terminal voltage drops below the V RCH thresh- old, the charger EN pin is recycled or the charging power source is reconnected. In all cases the AAT3663 will monitor all battery parameters and resume charging in the appropriate mode. AAT3663 1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications 3663.2007.10.1.0 11 Figure 1: Current and 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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