The AAT3691 BatteryManager from Analogic is a single-cell Lithium-Ion (Li-Ion) battery charger IC, designed to operate from USB ports, AC adapter inputs or from a cellular phone charger adapter up to an input voltage of 6,75 V typical. For increased safety, it includes over-voltage input protection (OVP) up to 28 V.
The IC precisely regulates battery charge voltage and current for 4,2 V Li-Ion battery cells. The charge current can be programmed up to 1,6 A for ADP charging and 0,5 A for USB charging by external resistors. In the case of an over-voltage condition of ADP or USB input power exceeding 6,75 V, the internal series switch opens, preventing damage to the battery and charging circuitry.
The AAT3691 also includes a no-battery present input (NOBAT). When the NOBAT indicates that no battery is present, OVP block will prevent the input power from passing through the OVP block and suspend the charging function.
Battery charging status is continuously monitored for fault conditions. In the event of a battery over-voltage or chip over-temperature failure, the charger will automatically shut down, protecting the charging device, control system and battery until the fault condition is removed. The open drain status monitor output pin is adopted to report battery charging activity.
The device comes in a lead-free, 16-pin 3 x 4 mm TDFN package and is specified for operation over the -40°C to +85°C temperature range.
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