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TI introduces smallest Impedance Track™ battery fuel gauge for handheld electronics

Extends family of high-accuracy battery fuel gauges with system- and pack-side devices

Mar 9, 2009

DALLAS (March 9, 2009) - Texas Instruments Incorporated (TI) (NYSE: TXN) today introduced a single-cell battery fuel gauge integrated circuit (IC) with Impedance TrackTM 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 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. For details see:www.ti.com/bq275xx-pr.

TI also introduced the 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. 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

Availability and pricing

TI's single-cell battery fuel gauges are available today in volume production from TI and its global network of authorized distributors. The table below includes pricing and packaging information.

Device

Description

Package (mm)

1K-unit price

bq27505

System-side design, requires external 2.5-V LDO

12-ball chip scale, 2.5 x 2 x 0.635

$1.45

bq27541

Pack-side, internal LDO

12-pin SON, 2.5 x 4

$1.85

bq27510

System-side, internal LDO

12-pin SON, 2.5 x 4

$1.85

bq27501

System-side, resistor ID for multiple chemistries

12-pin SON, 2.5 x 4

$1.35

bq27500-V120

System-side, external LDO

12-pin SON, 2.5 x 4

$1.35

Find out more about TI's single-cell battery fuel gauge ICs at the links below: