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B340LADITR-ND Datasheet(PDF) 8 Page - Skyworks Solutions Inc. |
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B340LADITR-ND Datasheet(HTML) 8 Page - Skyworks Solutions Inc. |
8 / 18 page AAT3682 DATA SHEET Li-Ion/Polymer Linear Battery Charger 8 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 Functional Description The AAT3682 is a linear charger designed for single-cell lithium-ion/polymer batteries. It is a full-featured bat- tery management system IC with multiple levels of power savings, system communication, and protection integrated inside. Refer to the block diagram above and the flow chart and typical charge profile graph (Figures 1 and 2) in this section. Cell Preconditioning Before the start of charging, the AAT3682 checks sev- eral conditions in order to maintain a safe charging envi- ronment. The input supply must be above the minimum operating voltage, or under-voltage lockout threshold (VUVLO), 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. Functional Block Diagram MUX T2X LED Signal Generator Microcontroller Status Generator Microcontroller Read Enable Charge Status Logic Control Power-On Reset VSS STAT DRV GATE BAT Under-Voltage Lock Out Over-Current / Short-Circuit Protection 2X Trickle Charge Control Loop Select MUX Driver V REF Temperature Sense Comparator Voltage Comparator Voltage Loop Error Amp Current Loop Error Amp VP VCC BSENSE T2X TS CSI |
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