Intersil Corp. (Milpitas, CA) introduced what is claimed to be the industry's smallest and most advanced lithium-ion/lithium-polymer battery charger IC, the AnyAdapter™ ISL6292. Designed for a wide range of hand-held device applications, the next-generation charger IC saves valuable space in its near-chip-scale 3mm x 3mm, dual flat no-lead (DFN) package while offering high thermal efficiency along with full voltage protection, current protection and Intersil's Thermaguard™ temperature-controlled charge-rate protection.
The ISL6292 AnyAdapter charger IC accepts a wide range of voltage sources, including voltage and current-limited, wall-plug modules and USB bus power. The advanced IC operates as a linear charger when the ac adapter is a voltage source by charging the cell in a constant-current then constant-voltage profile. The constant voltage is either 4.1V (ISL6292-1CRX) or 4.2V (ISL6292-2CRX) with 1% accuracy. Charge current is resistor-programmable up to a maximum of 2A with 10% accuracy.
The ISL6292 also works with a current-limited adapter to minimize thermal dissipation, in which case, the IC operates as a linear charger, but offers the thermal efficiency typically found only with pulse or switching chargers. Intersil's AnyAdapter technology enables up to an astounding 750% less thermal generation than competing solutions, thus allowing a significant reduction in charge time for similar operating conditions. A choice of packages includes the thermally enhanced 3mm x 3mm DFN, the 4mm x 4mm QFN and 5mm x 5mm QFN. All are priced at $0.95 each in 1,000-unit quantities.