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B340LADITR-ND Datasheet(PDF) 10 Page - Skyworks Solutions Inc. |
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B340LADITR-ND Datasheet(HTML) 10 Page - Skyworks Solutions Inc. |
10 / 18 page AAT3682 DATA SHEET Li-Ion/Polymer Linear Battery Charger 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012 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 Figure 2: Typical Charge Profile. When these conditions have been met and a battery is connected to the BAT pin, the AAT3682 checks the state of the battery. If the cell voltage is below VMIN, the AAT3682 begins preconditioning the cell. This is per- formed by charging the cell with 10% of the programmed constant current amount. 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 transis- tor when the voltage across the device is largest. The AAT3682 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 VSS. If an over-temperature fault is triggered, the fast trickle charge will be latched off, and the AAT3682 will continue at the default 10% charge current. Constant Current Charging The cell preconditioning continues until the voltage on the BAT pin reaches VMIN. At this point, the AAT3682 begins constant current charging (fast charging). Current level for this mode is programmed using a current sense resistor RSENSE between the VCC and CSI pins. The CSI pin monitors the voltage across RSENSE to provide feed- back for the current control loop. The AAT3682 remains in constant current charge mode until the battery reach- es the voltage regulation point, VCH. Constant Voltage Charging When the battery voltage reaches VCH during constant current mode, the AAT3682 transitions to constant volt- age mode. The regulation voltage is factory programmed to 4.2V. In constant voltage operation, the AAT3682 monitors the cell voltage and terminates the charging cycle when the voltage across RSENSE decreases to approximately 10mV. Charge Cycle Termination, Recharge Sequence After the charge cycle is complete, the AAT3682 shuts off the pass device and automatically enters power- saving sleep mode. Either of two possible conditions will bring the IC out of sleep mode: the battery voltage at the BAT pin drops below VRCH (recharge threshold volt- age) or the AAT3682 is reset by cycling the input supply through the power-on sequence. Falling below VRCH sig- nals the IC that it is time to initiate a new charge cycle. Sleep Mode When the input supply is disconnected, the device auto- matically enters power-saving sleep mode. Only con- suming an ultra-low 2μA current, the AAT3682 minimizes battery drain when it is not charging. This feature is particularly useful in applications where the input supply level may fall below the battery charge or under-voltage lockout level. In such cases, where the AAT3682 input voltage drops, the device will enter the sleep mode and automatically resume charging once the input supply has recovered from its fault condition. This makes the AAT3682 well suited for USB battery charger applica- tions. Charge Inhibit The AAT3682 charging cycle is fully automatic; however, it is possible to stop the device from charging even when all conditions are met for proper charging. Switching the TS pin to either VIN or GND will force the AAT3682 to turn off the pass device and wait for a voltage between the low and high temperature voltage thresholds. |
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