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Date: 26-03-13

Fast charging ICs for Lithium Ion batteries in phones and tablets

Texas Instruments has introduced lithium-ion battery charger IC chips that 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.

TI'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 as per TI includes:
Faster charging for single-cell lithium battery packs: 4.5-A output, 20-V 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. Meets Energy Star and European Union charging specifications. Programmable thermal regulation temperature significantly improves system-level design.
Longer battery run-time: Integrated battery discharge MOSFET provides the industry's lowest on-resistance of 12 milliohms.
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. bq24193 supports JEITA guidelines.
Simple to design: Smallest, most integrated battery charging solution (4-mm x 4-mm QFN package) integrates Power Path management, synchronous FETs, integrated current sensing, internal loop compensation and bootstrap diode.

Availability and pricing: 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. Designers can order the bq2419xEVM through TI's eStore.

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