Maxim has introduced the MAX1908, a highly integrated, multichemistry battery charger that it says helps simplify the construction of accurate, efficient chargers. The device charges two to four lithium ion (Li+) series cells, providing 4 A of charging current. When charging, this device automatically transitions from regulating current to regulating voltage. Programmed by the host or hardwired, it uses analog inputs to control charge current and voltage. Buck topology with synchronous rectification achieves high efficiency.
The MAX1908's outputs monitor battery charging current, the presence of an AC adapter, and the currents drawn from it. To reduce the cost of the AC adapter, the MAX1908 allows programming of the maximum current drawn from the AC adapter. This avoids overloading the AC adapter when simultaneously supplying the load and the charger.
This device provides 0,5% accurate battery voltage regulation, which extends battery capacity and minimises charging times. Additionally, the MAX1908 provides superior control of charger parameters. With 5% accurate charge current regulation and AC adapter current limiting using only 15 mW resistors, hot spots in the system are eliminated.
The MAX1908 comes in 28-pin QFN (5 x 5 mm) and is specified for -40 to +85°C.
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