Date: 10/03/2009

Tiny battery fuel gauge ICs to capture accurate battery parameters in mobile phones

Texas Instruments has launched single-cell battery fuel gauge integrated circuit (IC) with Impedance Track technology, which is half the size of its predecessor. The tiny bq27505 stand-alone lithium battery capacity monitoring and reporting device resides in the system and measures 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.


TI also unveiled bq27541, which resides within a battery pack or on the 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.



Impedance Track technology accurately predicts battery capacity instantly under all operating conditions, including battery age, temperature and discharge behavior.

Key features and benefits:
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
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

For more information on TI's single-cell battery fuel gauge ICs visit: www.ti.com/bq275xx-pr