A newer version of this product is available

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
BQ34Z110 ACTIVE Wide range fuel gauge with Impedance Track™; for lead acid batteries | battery gas gauge SHA-1/HMAC authentication, up to 32-A charge and discharge currents
BQ40Z50-R2 ACTIVE 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0 SHA-1 authentication, TURBO mode 2.0, black box recorder, adaptive charging

Product details

Cell chemistry Li-Ion/Li-Polymer Number of series cells 2-4 Cells Communication interface DQ Battery capacity (min) (mAh) 500 Battery capacity (max) (mAh) 6000 Implementation Pack External capacity indication LED Features Coulomb Counter Operating temperature range (°C) -20 to 70 Rating Catalog
Cell chemistry Li-Ion/Li-Polymer Number of series cells 2-4 Cells Communication interface DQ Battery capacity (min) (mAh) 500 Battery capacity (max) (mAh) 6000 Implementation Pack External capacity indication LED Features Coulomb Counter Operating temperature range (°C) -20 to 70 Rating Catalog
SOIC (D) 16 59.4 mm² 9.9 x 6
  • Conservative and repeatable measurement of available capacity in Lithium Ion rechargeable batteries
  • Designed for battery pack integration
    • 120µA typical operating current
    • Small size enables implementations in as little as ½ square inch of PCB
  • Integrate within a system or as a stand-alone device
    • Display capacity via single-wire serial communication port or direct drive of LEDs
  • Measurements compensated for current and temperature
  • Self-discharge compensation using internal temperature sensor
  • 16-pin narrow SOIC

  • Conservative and repeatable measurement of available capacity in Lithium Ion rechargeable batteries
  • Designed for battery pack integration
    • 120µA typical operating current
    • Small size enables implementations in as little as ½ square inch of PCB
  • Integrate within a system or as a stand-alone device
    • Display capacity via single-wire serial communication port or direct drive of LEDs
  • Measurements compensated for current and temperature
  • Self-discharge compensation using internal temperature sensor
  • 16-pin narrow SOIC

The bq2050 Lithium Ion Power Gauge™ IC is intended for battery-pack or in-system installation to maintain an accurate record of available battery capacity. The IC monitors a voltage drop across a sense resistor connected in series between the negative battery terminal and ground to determine charge and discharge activity of the battery. Compensations for battery temperature and rate of charge or discharge are applied to the charge, discharge, and self-discharge calculations to provide available capacity information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or "learned," in the course of a discharge cycle from full to empty.

Nominal available capacity may be directly indicated using a five-segment LED display. These segments are used to graphically indicate available capacity. The bq2050 supports a simple single-line bidirectional serial link to an external processor (common ground). The bq2050 outputs battery information in response to external commands over the serial link.

The bq2050 may operate directly from one cell (VBAT > 3V). With the REF output and an external transistor, a simple, inexpensive regulator can be built for systems with more than one series cell.

Internal registers include available capacity, temperature, scaled available energy, battery ID, battery status, and programming pin settings. To support subassembly testing, the outputs may also be controlled. The external processor may also overwrite some of the bq2050 power gauge data registers.

The bq2050 Lithium Ion Power Gauge™ IC is intended for battery-pack or in-system installation to maintain an accurate record of available battery capacity. The IC monitors a voltage drop across a sense resistor connected in series between the negative battery terminal and ground to determine charge and discharge activity of the battery. Compensations for battery temperature and rate of charge or discharge are applied to the charge, discharge, and self-discharge calculations to provide available capacity information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or "learned," in the course of a discharge cycle from full to empty.

Nominal available capacity may be directly indicated using a five-segment LED display. These segments are used to graphically indicate available capacity. The bq2050 supports a simple single-line bidirectional serial link to an external processor (common ground). The bq2050 outputs battery information in response to external commands over the serial link.

The bq2050 may operate directly from one cell (VBAT > 3V). With the REF output and an external transistor, a simple, inexpensive regulator can be built for systems with more than one series cell.

Internal registers include available capacity, temperature, scaled available energy, battery ID, battery status, and programming pin settings. To support subassembly testing, the outputs may also be controlled. The external processor may also overwrite some of the bq2050 power gauge data registers.

Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 4
Type Title Date
* Data sheet Lithium Ion Power Gauge (TM) IC datasheet (Rev. A) 11 Feb 2003
User guide EV2050 Power Gauge Evaluation Board 05 Sep 1999
User guide EV2050 Power Gauge Evaluation Board Product Brief 05 Sep 1999
Application note Using the bq2050 to Monitor Lead-Acid Batteries 05 Sep 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Package Pins CAD symbols, footprints & 3D models
SOIC (D) 16 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos