SLUSCB6B May 2015  – June 2017


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Timing Requirements
    7. 6.7Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1 Battery Preconditioning
      2. 7.3.2 Battery Fast-Charge Constant Current
      3. 7.3.3 Charge-Current Monitor
      4. 7.3.4 Battery Fast-Charge Voltage Regulation
      5. 7.3.5 Charge Termination Detection and Recharge
      6. 7.3.6 Charge Status Outputs
      7. 7.3.7  PG Output (bq24080-Q1)
      8. 7.3.8 Charge-Enabled (CE) Input (bq24080-Q1)
      9. 7.3.9 Timer Enabled (TE) Input (bq24081-Q1)
      10. 7.3.10Temperature Qualification (bq24081-Q1)
      11. 7.3.11Timer Fault and Recovery
        1. Number 1
        2. Number 2
    4. 7.4Device Functional Modes
      1. 7.4.1Sleep Mode
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
        2. Temperature Sense (bq24081-Q1):
        3. Pins (All Devices) and PG Pin (bq24080-Q1):
        4. Input and Output Capacitors
      3. 8.2.3Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
    3. 10.3Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1Device Support
    2. 11.2Documentation Support
    3. 11.3Related Links
    4. 11.4Receiving Notification of Documentation Updates
    5. 11.5Community Resources
    6. 11.6Trademarks
    7. 11.7Electrostatic Discharge Caution
    8. 11.8Glossary
  12. 12Mechanical, Packaging, and Orderable Information


  • Integrated Power FET and Current Sensor for
    Up to 1-A Charge Applications From AC Adapter
  • Precharge Conditioning With Safety Timer
  • Charge and Power-Good Status Output
  • Automatic Sleep Mode for Low Power Consumption
  • Integrated Charge-Current Monitor
  • Fixed 7-Hour Fast Charge Safety Timer
  • Ideal for Low-Dropout Charger Designs for
    Single-Cell Li-Ion or Li-Pol Packs in
    Space-Limited Portable Applications
  • Small 3-mm × 3-mm SON Package


  • Linear Chargers for Automotive
  • E-Call/ Back Up Call battery
  • Automotive Infotainment
  • Key FOB in Automotive


The bq24080-Q1 and bq24081-Q1 are highly integrated and flexible Li-Ion linear charge devices targeted at space-limited charger applications. They offer an integrated power FET and current sensor, high-accuracy current and voltage regulation, charge status, and charge termination, in a single monolithic device. An external resistor sets the magnitude of the charge current.

The device charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on minimum current. An internal charge timer provides a backup safety for charge termination. The device automatically restarts the charge if the battery voltage falls below an internal threshold. The device automatically enters sleep mode when the ac adapter is removed.

Device Information(1)

bq24080-Q1(2) VSON (10)3.00 mm x 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.
  2. Product Preview

Simplified Schematic

bq24080-Q1 bq24081-Q1 fp_circuit_sluscb6.gif