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Li-ion linear battery chargers detect USB

Posted: 16 Oct 2009 ?? ?Print Version ?Bookmark and Share

Keywords:Li-ion batter? battery charger? USB?

bq2405x battery charger

Texas Instruments Inc. is rolling out two families of 800mA USB battery chargers with automatic USB detection for single-cell Li-ion battery-powered electronics. The bq2404x and bq2405x battery charger ICs operate in the high input-voltage range of up to 30V. They offer 6.6V overvoltage protection to support handheld devices, from entry-level feature phones to smart phones, and other low-power handheld devices, that may use low-cost adapters.

The bq2405x's automatic USB detection feature can intelligently detect if a power source is a dedicated power adapter or USB port. This allows a system to start immediate fast charging if a USB transceiver is unavailable due to a discharged battery.

Key features of the bq2404x and bq2405x battery chargers include 1 percent charge voltage and 10 percent current accuracy using single-output channel. They are USB-compliant, with USB current limiting and input voltage dynamic power management capabilities. The devices also comply with JEITA guidelines, carry 30V input rating and overvoltage protection and tout a 10-hour safety timer. They are flexible, with the bq2405x boasting automatic input source detection of USB port or a dedicated power adapter.

TI's bq24040, bq24041, bq24050, bq24052 and bq24055 linear chargers are available in volume. The devices come in two package options: a 10-pin, 2mm x 2mm, or 12-pin, 2mm x 3mm SON package. Suggested resale pricing is $1.15 to $1.45 in 1,000-unit quantities. Samples, evaluation modules and application notes on TI's battery chargers are available.

For application notes on battery chargers click here.

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