Dallas - Texas Instruments says its bq24100, now available in volume, is the first synchronous switch-mode charger IC with internal power FETs capable of supplying up to 2 amps, and thus charges batteries significantly faster while cutting down on the heat. The stand alone bq24100 serves one-, two- and three-cell lithium-ion or lithium-polymer battery packs such as used in portable DVD and media players, smart handhelds, medical, industrial and other portable equipment.
The PWM-controller type IC, operating at a fixed frequency of 1.1 MHz from an input up to 16 volts, charges in three steps: low-current conditioning for deeply discharged batteries, a fast-charge constant-current phase, and a constant-voltage phase. Status outputs indicate the charge state. A programmable timer provides a safety backup for charge termination. The chip, also available in a system-controlled version, allows a microcontroller to set the battery charging profile. The IC automatically initiates charging if the battery voltage falls below a specific threshold.
The bq24100 is available in a 20-pin, 3.5-by-4.5 mm QFN package. Suggested resale price is $2.10 each in 1k units. A bq24100 evaluation module, application notes, technical documentation and a Power Management selection guide are available at the company web site.