SLUSBI8B January   2014  – May 2017

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Undervoltage Lockout
      2. 8.3.2 Power On
      3. 8.3.3 Power-Path Management
        1. 8.3.3.1 Input Source Connected - Adapter or USB
          1. 8.3.3.1.1 Input DPM Mode, VIN-DPM
          2. 8.3.3.1.2 DPPM Mode
          3. 8.3.3.1.3 Battery Supplement Mode
        2. 8.3.3.2 Input Source Not Connected
      4. 8.3.4 Battery Charging
        1. 8.3.4.1 Charge Current Translator
        2. 8.3.4.2 Battery Detection and Recharge
        3. 8.3.4.3 Termination Disable (TD Input, bq24230H)
        4. 8.3.4.4 Adjustable Termination Threshold (ITERM Input, bq24232H)
        5. 8.3.4.5 Dynamic Charge Timers (TMR Input)
        6. 8.3.4.6 Status Indicators (PGOOD, CHG)
          1. 8.3.4.6.1 Timer Fault
        7. 8.3.4.7 Thermal Regulation and Thermal Shutdown
      5. 8.3.5 Battery Pack Temperature Monitoring
    4. 8.4 Device Functional Modes
      1. 8.4.1 Explanation of Deglitch Times and Comparator Hysteresis
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Calculations
          1. 9.2.2.1.1 Program the Fast-Charge Current (ISET):
          2. 9.2.2.1.2 Program the Input Current Limit (ILIM)
          3. 9.2.2.1.3 Program the Termination Current Threshold (ITERM)
          4. 9.2.2.1.4 Program 6.25-Hour Fast-Charge Safety Timer (TMR)
        2. 9.2.2.2 TS Function
        3. 9.2.2.3 CHG and PGOOD
        4. 9.2.2.4 Selecting IN, OUT, AND BAT Pin Capacitors
        5. 9.2.2.5 Sleep Mode
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 Stand-Alone Charger
  10. 10Power Supply Recommendations
    1. 10.1 Requirements for OUT Output
    2. 10.2 USB Sources and Standard AC Adapters
    3. 10.3 Half-Wave Adapters
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Package
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Fully Compliant USB Charger
    • Selectable 100-mA and 500-mA Maximum Input Current
    • 100-mA Maximum Current Limit Ensures Compliance to USB-IF Standard
    • Input-based Dynamic Power Management (VIN– DPM) for Protection Against Poor USB Sources
  • 28-V Input Rating With Overvoltage Protection
  • 4.35-V Battery Regulation
  • Integrated Dynamic Power-Path Management (DPPM) Function Simultaneously and Independently Powers the System and Charges the Battery
  • Supports up to 500-mA Charge Current With Current Monitoring Output (ISET)
  • Programmable Input Current Limit up to 500 mA for Wall Adapters
  • Programmable Termination Current (bq24232H)
  • Programmable Precharge and Fast-Charge Safety Timers
  • Reverse Current, Short-Circuit, and Thermal Protection
  • NTC Thermistor Input
  • Proprietary Start-up Sequence Limits Inrush Current
  • Status Indication – Charging/Done, Power Good
  • Small 3-mm × 3-mm 16-Lead QFN Package

2 Applications

  • Bluetooth® Devices
  • Low-Power Handheld Devices

3 Description

The bq2423xH series of devices are highly integrated Li-ion linear chargers and system power-path management devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter and support charge currents from 25 mA to 500 mA. The high-input voltage range with input overvoltage protection supports low-cost, unregulated adapters. The USB input current limit accuracy and start-up sequence allow the bq2423xH to meet USB-IF inrush current specifications. Additionally, the input dynamic power management (VIN-DPM) prevents the charger from crashing poorly designed or incorrectly configured USB sources.

The bq2423xH features dynamic power-path management (DPPM) that powers the system while simultaneously and independently charging the battery. The DPPM circuit reduces the charge current when the input current limit causes the system output to fall to the DPPM threshold, thus supplying the system load at all times while monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on the battery, allows for proper charge termination, and enables the system to run with a defective or absent battery pack. Additionally, this feature enables instant system turn-on even with a totally discharged battery. The power-path management architecture also lets the battery supplement the system current requirements when the adapter cannot deliver the peak system currents, thus enabling the use of a smaller adapter.

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 the 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 input current limit and charge current are programmable using external resistors.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq2423xx VQFN (16) 3.00 mm x 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Application Circuit

bq24230H bq24232H ap2a_cirfp_lusBI8.gif

4 Revision History

Changes from A Revision (November 2014) to B Revision

  • Changed from "Table 2" to "Table 1" in the Pin Functions Description column for EN1/EN2 Go

Changes from * Revision (January 2014) to A Revision

  • Added ESD Ratings 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