Battery Charger IC Works With All Common Battery Types

Offered in a small-outline TSSOP-16 with a 1.2 mm height profile, the Si9731DQ works with the system microprocessor or microcontroller in cell phones, PDAs and other handheld appliances to provide a complete, chemistry-independent battery charger solution. The device uses two internal power MOSFETs to provide trickle charging or fast charging depending on battery voltage at the beginning of the charge cycle. Since it uses a pulse charging technique with short on-times and long off-times, power dissipation is kept to a minimum and no external inductor is required. The microprocessor-controlled charger allows the same IC to be used for lithium ion or nickel battery designs, different charger types, different charging algorithms, and different power management architectures. The charger can be used in conjunction with a regulated or unregulated external dc power source, including most low-cost wall adapters rated from 4.5V to 12V. Production quantities are available with lead times of 10 to 12 weeks for larger orders, priced at $1.40 each/100,000.