Li-Ion Battery Chargers Support USB OTG and Deliver Faster, Cooler ChargingMarch 24, 2013 by Jeff Shepard
Texas Instruments Incorporated (TI) new lithium-ion battery charger ICs can reduce charge time by 50 percent in smartphones and tablets compared to other charger solutions. The bq2419x family of 4.5-A output, 20-V input-rated switch-mode chargers with I2C interface and USB On-the-Go (OTG) support delivers faster and cooler charging to a wide array of applications ranging from power banks and packs to 4G LTE routers, Wi-Fi speakers, portable medical and industrial designs.
Consumers continue to want faster battery charging in portable electronics. New designs require more accurate, highly efficient charge circuitry that keeps the system cool and safe while charging at a faster rate. TIâ€™s new bq24190, bq24192, bq24192i, bq24193, bq24195, bq24195L and bq24196 fast-charge circuits reduce charge time through battery path impedance compensation, and offer programmable thermal management capability to ensure the safest, most reliable system operation.
Key features and benefits of the bq2419x include: Faster charging for single-cell lithium battery packs: 4.5A output, 20V input chargers cut charge time in half with unique battery path impedance compensation. Cooler charging with highest efficiency: 4.5-A switch-mode charger achieves 92-percent efficiency at 2 A and up to 90-percent efficiency at 4 A of output current. They meet Energy Star and European Union charging specifications. Programmable thermal regulation temperature significantly improves system-level design.
Additional features include: Longer battery run-time: Integrated battery discharge MOSFET provides the industryâ€™s lowest on-resistance of 12 mÎ©. Highest efficiency for USB OTG: 92-percent boost efficiency at 2.1 amps with the bq24195. Safe charging: Prevents overvoltage, protects the battery and system during charging. The bq24193 supports JEITA guidelines. It is claimed to be the smallest, most integrated battery charging solution (4-mm x 4-mm QFN package) and integrates Power Path management, synchronous FETs, integrated current sensing, internal loop compensation and bootstrap diode.
The bq2419x battery chargers for single-cell Li-Ion batteries is available now in a 24-pin, 4-mm x 4-mm QFN package, priced at US$2.50 in quantities of 1,000.