Texas Instruments Incorporated (Texas Instruments), a semiconductor manufacturer, has introduced a new single-cell battery fuel gauge integrated circuit (IC), bq27505, with Impedance Track technology, which is half the size of its predecessor. The company also introduced the bq27541, which resides within a battery pack or on system's main board in an embedded, non-removable battery. The device also provides secure battery pack authentication, using the SHA-1/HMAC authentication algorithm.

The tiny bq27505 stand-alone lithium battery capacity monitoring and reporting device resides in the system and measures only 2.5 mm x 2 mm x 0.625 mm, and supports portable applications, such as smart phones, digital cameras and MP3 players, where maintaining long battery life is critical for end users.

Impedance Track technology accurately predicts battery capacity instantly under all operating conditions, including battery age, temperature and discharge behavior. Today, TI ships millions of battery fuel gauge ICs with Impedance Track technology to customers worldwide in applications ranging from notebooks to smart phones.

Key features of the bq27505:

Patented Impedance Track next-generation gauging algorithm;

Accurate and complete battery fuel gauge;

CPU-based IC reports remaining capacity, time-to-empty, voltage, current, temperature and more;

Calculates remaining charge under all conditions;

System-side implementation even with a removable battery;

12-pin, 2.5 x 2 x 0.625 mm WCSP package.

Key benefits:

Provides complete state-of-health battery information so a system can effectively manage the battery and extend run-time;

No calculations needed with the host microcontroller for easy implementation;

Accurate display of run time under all conditions;

No extra circuitry needed inside the battery pack;

Smallest Impedance Track solution in the industry.