Home Battery management ICs Battery charger ICs
Home
Battery management ICs
Battery charger ICs

BQ2031

ACTIVE

Switch-mode Lead-Acid Battery Charger with User-Selectable Charge Algorithms

Order now
Data sheet

BQ2031

ACTIVE
Data sheet Order now

Product details

Number of series cells 6 Charge current (max) (A) 2 Vin (max) (V) 5.5 Cell chemistry Lead Acid Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 20 Absolute max Vin (max) (V) 7 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Vin (min) (V) 4.5 Rating Catalog Operating temperature range (°C) -20 to 70
Number of series cells 6 Charge current (max) (A) 2 Vin (max) (V) 5.5 Cell chemistry Lead Acid Battery charge voltage (min) (V) 0 Battery charge voltage (max) (V) 20 Absolute max Vin (max) (V) 7 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Vin (min) (V) 4.5 Rating Catalog Operating temperature range (°C) -20 to 70
PDIP (N) 16 181.42 mm² 19.3 x 9.4 SOIC (D) 16 59.4 mm² 9.9 x 6
  • Conforms to battery manufacturers' charge recommendations for cyclic and float charge
  • Pin-selectable charge algorithms

    • - Two-Step Voltage with temperature-compensated constant-voltage maintenance
    - Two-Step Current with constant-rate pulsed current maintenance
    - Pulsed Current: hysteretic, on-demand pulsed current
  • Pin-selectable charge termination by maximum voltage, 2V, minimum current, and maximum time
  • Pre-charge qualification detects shorted, opened, or damaged cells and conditions battery
  • Charging continuously qualified by temperature and voltage limits
  • Internal temperature-compensated voltage reference
  • Pulse-width modulation control

    • - Ideal for high-efficiency switch-mode power conversion
    - Configurable for linear or gated current use
  • Direct LED control outputs display charge status and fault conditions
  • Conforms to battery manufacturers' charge recommendations for cyclic and float charge
  • Pin-selectable charge algorithms

    • - Two-Step Voltage with temperature-compensated constant-voltage maintenance
    - Two-Step Current with constant-rate pulsed current maintenance
    - Pulsed Current: hysteretic, on-demand pulsed current
  • Pin-selectable charge termination by maximum voltage, 2V, minimum current, and maximum time
  • Pre-charge qualification detects shorted, opened, or damaged cells and conditions battery
  • Charging continuously qualified by temperature and voltage limits
  • Internal temperature-compensated voltage reference
  • Pulse-width modulation control

    • - Ideal for high-efficiency switch-mode power conversion
    - Configurable for linear or gated current use
  • Direct LED control outputs display charge status and fault conditions

The bq2031 Lead-Acid Fast Charge IC is designed to optimize charging of lead-acid chemistry batteries. A flexible pulse-width modulation regulator allows the bq2031 to control constant-voltage, constant-current, or pulsed-current charging. The regulator frequency is set by an external capacitor for design flexibility. The switch-mode design keeps power dissipation to a minimum for high charge current applications.

A charge cycle begins when power is applied or the battery is replaced. For safety, charging is inhibited until the battery voltage is within configured limits. If the battery voltage is less than the low-voltage threshold, the bq2031 provides trickle-currentcharging until the voltage rises into the allowed range or an internal timer runs out and places the bq2031 in a Fault condition. This procedure prevents high-current charging of cells that are possibly damaged or reversed. Charging is inhibited anytime the temperature of the battery is outside the configurable, allowed range. All voltage thresholds are temperature-compensated.

The bq2031 terminates fast (bulk) charging based on the following:

  • Maximum voltage
  • Second difference of cell voltage (2V)
  • Minimum current (in constant-voltage charging)
  • Maximum time-out (MTO)
    • After bulk charging, the bq2031 provides temperature-compensated maintenance (float) charging to maintain battery capacity.

    The bq2031 Lead-Acid Fast Charge IC is designed to optimize charging of lead-acid chemistry batteries. A flexible pulse-width modulation regulator allows the bq2031 to control constant-voltage, constant-current, or pulsed-current charging. The regulator frequency is set by an external capacitor for design flexibility. The switch-mode design keeps power dissipation to a minimum for high charge current applications.

    A charge cycle begins when power is applied or the battery is replaced. For safety, charging is inhibited until the battery voltage is within configured limits. If the battery voltage is less than the low-voltage threshold, the bq2031 provides trickle-currentcharging until the voltage rises into the allowed range or an internal timer runs out and places the bq2031 in a Fault condition. This procedure prevents high-current charging of cells that are possibly damaged or reversed. Charging is inhibited anytime the temperature of the battery is outside the configurable, allowed range. All voltage thresholds are temperature-compensated.

    The bq2031 terminates fast (bulk) charging based on the following:

  • Maximum voltage
  • Second difference of cell voltage (2V)
  • Minimum current (in constant-voltage charging)
  • Maximum time-out (MTO)
    • After bulk charging, the bq2031 provides temperature-compensated maintenance (float) charging to maintain battery capacity.
    filter Find other Battery charger ICs
    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 6
    Type Title Date
    * Data sheet Lead-Acid Fast-Charge IC datasheet 05 Sep 1999
    Application note Simple MPPT based Lead acid charger using BQ2031 (Rev. A) 08 Aug 2017
    Analog Design Journal 4Q 2011 Issue Analog Applications Journal 09 Nov 2011
    Analog Design Journal Solar charging solution provides narrow-voltage DC/DC system bus for multicell 09 Nov 2011
    User guide DV2031S2 Lead-Acid Charger Development System Control of On-Board p-FET (Rev. B) 16 Mar 2007
    Application note U-510 Using the bq2031 to Charge 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.

    GUI for evaluation module (EVM)

    SLVC024 — bq24715 EVM GUI Package

    Supported products & hardware

    Supported products & hardware

    Products
    Battery charger ICs
    BQ2000 — Switch-mode multi-chemistry battery charger with peak voltagedetection termination BQ2000T — Switch-mode multi-chemistry battery charger with dT/dt termination BQ2002 — NiCd/NiMH battery charge controller with negative dV, PVT and Top-Off Time setup1 BQ2002C — NiCd/NiMH battery charge controller with negative dV, PVT BQ2002D — NiCd/NiMH battery charge controller with dT/dt termination BQ2002E — NiCd/NiMH battery charge controller with negative dV, PVT and tMTO setup1 BQ2002F — NiCd/NiMH battery charge controller with negative dV, PVT and Top-Off Time setup2 BQ2002G — NiCd/NiMH battery charge controller with negative dV, PVT and tMTO setup2 BQ2002T — NiCd/NiMH battery charge controller with dT/dt termination and low-temperature fault BQ2031 — Switch-mode Lead-Acid Battery Charger with User-Selectable Charge Algorithms BQ2057C — Low Dropout linear 1-cell Li-ion battery charge controller with AutoCompTM, 4.2V BQ24010 — 1-cell, 1-A, linear Li-ion battery charger with AC present and temp sense in QFN-11 package BQ24012 — 1-cell, 1-A, linear Li-ion battery charger w/ FET, AC present & charge enable in QFN-12 BQ24013 — 1-cell, 1-A, linear Li-ion battery charger with charge enable & term enable in QFN-11 package BQ24200 — 500-mA, 4.2-V Li-ion charger for current-Limited App. w/temp sense in MSOP-8 BQ24201 — 500-mA, 4.1-V Li-ion charger for current-Limited App. w/temp sense in MSOP-8 BQ24202 — 500-mA, 4.2-V Li-ion charger for current-Limited App. w/charge status in MSOP-8 BQ24203 — 500-mA, 4.1-V Li-ion charger for current-Limited App. w/charge status in MSOP-8 BQ24205 — 500-mA, 4.1-V Li-ion charger for current-Limited App. in MSOP-8 BQ24715 — SMBus 2-3 cell NVDC Buck battery charge controller with N-Channel MOSFET selectors
    Download
    Package Pins CAD symbols, footprints & 3D models
    PDIP (N) 16 Ultra Librarian
    SOIC (D) 16 Ultra Librarian
    TI's Standard Terms and Conditions for Evaluation Items apply.

    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

    View all forum topics

    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