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BQ24800

ACTIVE

SMBus 1-4 cell Buck battery charge controller to support hybrid power boost and battery boost mode

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Data sheet

BQ24800

ACTIVE
Data sheet Order now

Product details

Number of series cells 1, 2, 3, 4 Charge current (Max) (A) 8.128 Operating Vin (Max) (V) 24 Cell chemistry Lead Acid, Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiCd, NiMH Battery charge voltage (Min) (V) 1.024 Battery charge voltage (Max) (V) 19.2 Absolute Vin (safety rating) (Max) ((V)) 30 Control interface SMBus Features IC thermal regulation, Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 4.5 Rating Catalog
Number of series cells 1, 2, 3, 4 Charge current (Max) (A) 8.128 Operating Vin (Max) (V) 24 Cell chemistry Lead Acid, Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiCd, NiMH Battery charge voltage (Min) (V) 1.024 Battery charge voltage (Max) (V) 19.2 Absolute Vin (safety rating) (Max) ((V)) 30 Control interface SMBus Features IC thermal regulation, Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 4.5 Rating Catalog
WQFN (RUY) 28 16 mm² 4 x 4
  • Hybrid Power Boost Mode to power up system from adapter and battery together
    • Ultra-fast transient response of 150 µs to enter Hybrid Power Boost Mode
  • Battery Only Boost Mode to extend battery run time
  • Peak power two-level input current limit to maximize the power from adapter and minimize battery discharge
  • Charge 1- to 4-cell battery pack from 4.5- to 24-V adapter
  • High accuracy power and current monitoring for CPU throttling
    • Comprehensive PROCHOT profile
    • ± 2% Current monitor accuracy
    • ± 5% System Power Monitor Accuracy (PMON)
  • Automatic NMOS power source selection from adapter or battery
    • ACFET Fast turn on in 100 µs when exiting learn mode from battery removal
  • Programmable input current, charge voltage, charge and discharge current limit
    • ±0.4% Charge voltage (16-mV/step)
    • ±2% Input current (64-mA/step)
    • ±2% Charge current (64-mA/step)
    • ±2% Discharge current (512-mA/step)
  • High integration
    • Battery LEARN function
    • Battery present monitor
    • Boost Mode indicator
    • Loop compensation
    • BTST Diode
  • Enhanced safety features for over-voltage protection, over-current protection, battery, inductor, and MOSFET short-circuit protection
  • Switching frequency: 300 kHz, 400 kHz, 600 kHz, and 800 kHz
  • Realtime system control on ILIM pin to limit charge and discharge current
  • 0.65-mA Adapter standby quiescent current for Energy Star
  • Hybrid Power Boost Mode to power up system from adapter and battery together
    • Ultra-fast transient response of 150 µs to enter Hybrid Power Boost Mode
  • Battery Only Boost Mode to extend battery run time
  • Peak power two-level input current limit to maximize the power from adapter and minimize battery discharge
  • Charge 1- to 4-cell battery pack from 4.5- to 24-V adapter
  • High accuracy power and current monitoring for CPU throttling
    • Comprehensive PROCHOT profile
    • ± 2% Current monitor accuracy
    • ± 5% System Power Monitor Accuracy (PMON)
  • Automatic NMOS power source selection from adapter or battery
    • ACFET Fast turn on in 100 µs when exiting learn mode from battery removal
  • Programmable input current, charge voltage, charge and discharge current limit
    • ±0.4% Charge voltage (16-mV/step)
    • ±2% Input current (64-mA/step)
    • ±2% Charge current (64-mA/step)
    • ±2% Discharge current (512-mA/step)
  • High integration
    • Battery LEARN function
    • Battery present monitor
    • Boost Mode indicator
    • Loop compensation
    • BTST Diode
  • Enhanced safety features for over-voltage protection, over-current protection, battery, inductor, and MOSFET short-circuit protection
  • Switching frequency: 300 kHz, 400 kHz, 600 kHz, and 800 kHz
  • Realtime system control on ILIM pin to limit charge and discharge current
  • 0.65-mA Adapter standby quiescent current for Energy Star

The BQ24800 device is a high-efficiency, synchronous buck battery charger, offering low component count for space-constrained, multi-chemistry battery charging applications.

The BQ24800 device supports hybrid power boost mode. Hybrid power boost mode boosts the battery up to the system voltage in order to supplement the adapter when system power demand is temporarily higher than the adapter is able to provide. The ultra-fast transition from battery charging to battery discharging prevents adapter crash from overloading condition.

The BQ24800 device also supports battery only boost mode when no adapter is present. When the battery voltage is above the minimum system operation voltage, the battery is directly connected to the system supply rail through BATFET. Once the battery voltage goes below the minimum system operation voltage, BQ24800 will turn on the boost mode to regulate the system supply rail, extending the system run time.

The BQ24800 device uses two charge pumps to separately drive N-channel MOSFETs (ACFET, RBFET, and BATFET) for automatic system power source selection.

Through SMBus, a system power management microcontroller programs input current, charge current, discharge current, and charge voltage DACs with high regulation accuracies.

The BQ24800 device monitors adapter current (IADP), battery discharge current (IDCHG), and system power (PMON) for host to throttle back CPU speed or reduce system power when needed.

The BQ24800 device charges 1-, 2-, 3-, or 4-series Li+ cells.

The BQ24800 device is a high-efficiency, synchronous buck battery charger, offering low component count for space-constrained, multi-chemistry battery charging applications.

The BQ24800 device supports hybrid power boost mode. Hybrid power boost mode boosts the battery up to the system voltage in order to supplement the adapter when system power demand is temporarily higher than the adapter is able to provide. The ultra-fast transition from battery charging to battery discharging prevents adapter crash from overloading condition.

The BQ24800 device also supports battery only boost mode when no adapter is present. When the battery voltage is above the minimum system operation voltage, the battery is directly connected to the system supply rail through BATFET. Once the battery voltage goes below the minimum system operation voltage, BQ24800 will turn on the boost mode to regulate the system supply rail, extending the system run time.

The BQ24800 device uses two charge pumps to separately drive N-channel MOSFETs (ACFET, RBFET, and BATFET) for automatic system power source selection.

Through SMBus, a system power management microcontroller programs input current, charge current, discharge current, and charge voltage DACs with high regulation accuracies.

The BQ24800 device monitors adapter current (IADP), battery discharge current (IDCHG), and system power (PMON) for host to throttle back CPU speed or reduce system power when needed.

The BQ24800 device charges 1-, 2-, 3-, or 4-series Li+ cells.
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Technical documentation

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Type Title Date
* Data sheet BQ24800 SMBus 1- to 4-Cell Buck Battery Charge Controller With Peak Power, Hybrid Power Boost and Battery Only Boost Modes datasheet PDF | HTML 28 Feb 2020
Application note Autonomous Smart Battery Guide PDF | HTML 15 Oct 2021
EVM User's guide BQ24800 EVM User's Guide 12 Feb 2020
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Technical article Should I use a linear charger or a switching charger? 31 Oct 2015
Technical article Summertime and the livin' is easy 20 Jun 2014

Design & development

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Evaluation board

BQ24800EVM — SMBus 2-S to 4-S hybrid power boost mode battery charge controller evaluation module

The BQ24800EVM evaluation module (EVM) is an SMBus 2-cell to 4-cell hybrid power boost mode battery charge controller with hybrid boost and processor hot monitoring. The input voltage range is between 4.5 V and 24 V, with a programmable output of 2–4 cells charge voltage and 128-mA to (...)
User guide: PDF
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Application software & framework

BQSTUDIO — Battery Management Studio (bqStudio) Software

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)
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WQFN (RUY) 28 View options

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