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In order to extend the battery life of smartphones, many manufacturers have opted for larger battery capacities. Devices like the Xperia Z (2330mAh), HTC One (2300mAh), Galaxy S4 (2600mAh), and LG Optimus G Pro (3140mAh) have all pushed the limits, with some even crossing into the 4000mAh range—such as Huawei’s Ascend Mate with a 4050mAh battery. This trend shows that users are increasingly demanding longer usage times without frequent recharging.
While larger batteries offer more power, they also bring a downside: when the battery dies, it can take a long time to recharge without fast charging technology. To tackle this issue, Texas Instruments has introduced a new line of lithium-ion battery charger ICs designed to cut charging time by up to 50%. These chips are aimed at smartphones, tablets, and other portable devices that rely on single-cell lithium-ion batteries.
The new charger ICs, known as “fast charge units,†include models such as the bq24190, bq24192, bq24192i, bq24193, bq24195, bq24195L, and bq24196. All of them support a 4.5A output and 20V input, allowing for efficient and controlled charging through an I2C interface. They also feature USB OTG support, making them versatile for various applications.
What makes these ICs stand out is their ability to speed up the charging process using a unique battery pack path impedance compensation technique. They integrate a Power Path controller, synchronous MOSFETs, current sensors, internal loop compensation, and a bootstrap diode—all in one compact design. This integration not only improves performance but also reduces the overall size of the charging circuitry.
Efficiency is another key feature. At 2A, the charging efficiency reaches 92%, and even at 4A, it remains high at 90%. The integrated MOSFET has a low resistance of just 12mΩ, which helps minimize power loss during charging. Additionally, the bq2419x series meets JEITA temperature standards, includes a programmable temperature controller, and offers overvoltage protection, ensuring safe and reliable operation.
Beyond smartphones and tablets, these ICs are also suitable for 4G LTE routers, portable power banks, Wi-Fi speakers, and even medical devices. TI has already started shipping the bq2419x series, with pricing at $2.50 per 1,000 units. However, the company hasn’t revealed which major clients have adopted the technology yet. With the growing demand for faster charging solutions, this new chip could be a game-changer in the mobile electronics industry.
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