SLUS940C September   2009  – December 2014

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
      1. 6.8.1 Power Up, Down, OVP, Disable and Enable Waveforms
      2. 6.8.2 Protection Circuits Waveforms
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Power Down, or Undervoltage Lockout (UVLO):
      2. 7.3.2  Power Up
      3. 7.3.3  D+, D- Detection:
      4. 7.3.4  New Charge Cycle
      5. 7.3.5  Overvoltage Protection (OVP) - Continuously Monitored
      6. 7.3.6  Power Good Indication (PG)
      7. 7.3.7  CHG Pin Indication
      8. 7.3.8  CHG and PG LED Pullup Source
      9. 7.3.9  Input DPM Mode (VIN-DPM or IN-DPM)
      10. 7.3.10 OUT
      11. 7.3.11 ISET
      12. 7.3.12 TS
      13. 7.3.13 Termination and Timer Disable Mode (TTDM) -TS pin high
      14. 7.3.14 Timers
      15. 7.3.15 Termination
      16. 7.3.16 Battery Detect Routine
      17. 7.3.17 Refresh Threshold
      18. 7.3.18 Starting a Charge on a Full Battery
    4. 7.4 Device Functional Modes
      1. 7.4.1 Sleep Mode
    5. 7.5 Programming
      1. 7.5.1 PRE_TERM - Precharge and Termination Programmable Threshold
      2. 7.5.2 ISET2
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 bq2405x Charger Application Design Example
        1. 8.2.1.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Program the Fast Charge Current, ISET
        2. 8.2.2.2 Program the Termination Current Threshold, ITERM
        3. 8.2.2.3 TS Function
        4. 8.2.2.4 CHG and PG
        5. 8.2.2.5 Selecting IN and OUT Pin Capacitors
      3. 8.2.3 Application Curves
      4. 8.2.4 bq24055 Application
        1. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
          1. 8.2.4.2.1 Program the Fast Charge Current, ISET
          2. 8.2.4.2.2 Program the Termination Current Threshold, ITERM
          3. 8.2.4.2.3 TS Function
          4. 8.2.4.2.4 CHG and PG
          5. 8.2.4.2.5 Selecting IN and OUT Pin Capacitors
        3. 8.2.4.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
      1. 10.3.1 Leakage Current Effects on Battery Capacity
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Charging
    • 1% Charge Voltage Accuracy
    • 10% Charge Current Accuracy
    • Pin Selectable USB 100-mA and 500-mA Maximum Input Current Limit
    • Programmable Termination and Precharge Threshold
  • Protection
    • 30-V Input Rating; With 6.6-V Input Overvoltage Protection
    • Input Voltage Dynamic Power Management
    • 125 °C Thermal Regulation; 150°C Thermal Shutdown Protection
    • OUT Short-Circuit Protection and ISET Short Detection
    • Operation Over JEITA Range Through Battery NTC - ½ Fast-Charge-Current at Cold, 4.06 V at Hot
    • Fixed 10-Hour Safety Timer
  • System
    • Auto Input Source Detection (D+, D– Pins)
      • No Device Transceiver Required
      • USB Friendly
    • Automatic Termination and Timer Disable Mode (TTDM) for Absent Battery Pack With Thermistor
    • Status Indication – Charging/Done
    • Available in Small 2-mm × 2-mm or
      2-mm × 3-mm Package

2 Applications

  • Smart Phones
  • PDAs
  • MP3 Players
  • Low-Power Handheld Devices

3 Description

The bq2405x series of devices are highly integrated Li-Ion and Li-Pol linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high-input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The bq2405x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10-hour safety timer.

The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The precharge current and termination current threshold are programmed through an external resistor. The fast charge current value is also programmable through an external resistor.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq24050 WSON (10) 2.00 mm × 2.00 mm
bq24052
bq24055 WSON (12) 2.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Circuit

app_cir_lus940.gif

4 Revision History

Changes from B Revision (June 2012) to C Revision

  • Added Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information sectionGo

Changes from A Revision (September 2009) to B Revision

  • Changed all occurrences of Li-Ion To: Li-Ion and Li-PolGo

Changes from * Revision (August 2009) to A Revision

  • Changed the status of the devices From: Product Preview To: Production DataGo