SLUS810K September 2008  – March 2015


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (continued)
  6. Device Comparison Table
  7. Pin Configuration and Functions
  8. Specifications
    1. 8.1Absolute Maximum Ratings
    2. 8.2ESD Ratings
    3. 8.3Recommended Operating Conditions
    4. 8.4Thermal Information
    5. 8.5Dissipation Ratings
    6. 8.6Electrical Characteristics
    7. 8.7Typical Characteristics
  9. Detailed Description
    1. 9.1Overview
    2. 9.2Functional Block Diagram
    3. 9.3Feature Description
      1. 9.3.1Undervoltage Lockout (UVLO)
      2. 9.3.2Power On
      3. 9.3.3Overvoltage Protection (OVP)
      4. 9.3.4Dynamic Power-Path Management
        1. Source Connected (ADAPTER or USB)
          1. DPM Mode (VIN-DPM)
          2. Mode
          3. Supplement Mode
        2. Source Not Connected
      5. 9.3.5Battery Charging
        1. Current Translator
        2. Termination Threshold (ITERM Input, bq24074)
        3. Disable (TD Input, bq24072, bq24073)
        4. Detection and Recharge
        5. Disconnect (SYSOFF Input, bq24075, bq24079)
        6. Charge Timers (TMR Input)
        7. Indicators (PGOOD, CHG)
        8. Regulation and Thermal Shutdown
      6. 9.3.6Battery Pack Temperature Monitoring
    4. 9.4Device Functional Modes
      1. 9.4.1Sleep Mode
      2. 9.4.2Explanation of Deglitch Times and Comparator Hysteresis
  10. 10Application and Implementation
    1. 10.1Application Information
    2. 10.2Typical Application
      1. 10.2.1Design Requirements
      2. 10.2.2Detailed Design Procedure
        1. Charger Design Example
          1. Disable (TD) (bq24072, bq24073 only)
          2. ON/OFF (SYSOFF) (bq24075 or bq24079 only)
          1. the Fast Charge Current (ISET):
          2. the Input Current Limit (ILIM)
          3. the Termination Current Threshold (ITERM) (bq24074 only)
          4. 6.25-hour Fast-Charge Safety Timer (TMR)
        3. Function
        4. CHG and PGOOD
        5. IN, OUT, and BAT Pin Capacitors
      3. 10.2.3Application Curves
    3. 10.3System Examples
      1. 10.3.1Standalone Charger
      2. 10.3.2Disconnecting the Battery From the System
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1Layout Guidelines
    2. 12.2Layout Example
    3. 12.3Thermal Considerations
  13. 13Device and Documentation Support
    1. 13.1Device Support
      1. 13.1.1Third-Party Products Disclaimer
    2. 13.2Related Links
    3. 13.3Trademarks
    4. 13.4Electrostatic Discharge Caution
    5. 13.5Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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
  • Integrated Dynamic Power Path Management (DPPM) Function Simultaneously and Independently Powers the System and Charges the Battery
  • Supports up to 1.5-A Charge Current with Current Monitoring Output (ISET)
  • Programmable Input Current Limit up to 1.5 A for Wall Adapters
  • System Output Tracks Battery Voltage (bq24072)
  • Programmable Termination Current (bq24074)
  • Battery Disconnect Function with SYSOFF Input (bq24075, bq24079)
  • Programmable Pre-Charge 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
  • Typical Application Circuit

    bq24072 bq24073 bq24074 bq24075 bq24079 discon_bat_cir_lus810.gif

2 Applications

  • Smart Phones
  • Portable Media Players
  • Portable Navigation Devices
  • Low-Power Handheld Devices

3 Description

The bq2407x series of devices are 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 an AC adapter and support charge currents up to 1.5 A. The input voltage range with input overvoltage protection supports unregulated adapters. The USB input current limit accuracy and start up sequence allow the bq2407x to meet USB-IF inrush current specifications. Additionally, the input dynamic power management (VIN-DPM) prevents the charger from crashing incorrectly configured USB sources.

The bq2407x 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.

Device Information(1)

bq24072VSON (16)3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Revision History

Changes from J Revision (January 2015) to K Revision

  • Deleted package type code from Device Comparison Table. See the POA at the end of the data sheet. Go
  • Changed ICHG Battery fast charge current range MIN specification from "150 mA" to "100 mA"Go

Changes from I Revision (January 2014) to J 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

Changes from H Revision (December 2013) to I Revision

  • Changed resistor value from "3 kΩ" to "8.9 kΩ" in the Pin Functions table ISET Description paragraph.Go
  • Changed RISET spec MAX value from "3000" to "8900" in the Recommended Operating Conditions table.Go
  • Changed resistor value from "3 kΩ" to "5.9 kΩ" in the Battery Charging section paragraph.Go

Changes from G Revision (July 2011) to H Revision

  • Changed ICHG Battery fast charge current range MIN specification from "300 mA" to "150 mA"Go

Changes from F Revision (September 2010) to G Revision

  • Added ESD human body model specification to Abs Maximum Ratings table.Go

Changes from E Revision (August 2010) to F Revision

  • Changed 10 x 45 s/kΩ to 10 x 48 s/kΩ under section Program 6.25hour......(TMR)Go

Changes from D Revision (June 2009) to E Revision

  • Changed globally RT1 and RT2 to Rs and RpGo
  • Added equations 2 and 3 plus explanations and tableGo

Changes from C Revision (March 2009) to D Revision

  • Added Device number bq24079.Go

Changes from B Revision (January 2009) to C Revision

  • Changed Maximum input current factor values. Go

Changes from A Revision (December 2008) to B Revision

  • Changed VBAT(REG) max value From 4.24 V To: 4.23 VGo

Changes from * Revision (September 2008) to A Revision

  • Changed device Features.Go
  • Changed Typical Application CircuitGo
  • Changed Description.Go
  • Changed description of CHG pin.Go
  • Changed SYSOFF Description.Go
  • Added Figure 34 through Figure 1.Go
  • Changed the Simplified Block DiagramGo
  • Changed text in section - STATUS INDICATORS (PGOOD, CHG)Go
  • Changed Table - CHG STATUS INDICATORGo
  • Changed Equation 8 and Equation 9Go
  • Changed APPLICATION CIRCUITS section.Go
  • Added Using bq24075 to Disconnect the Battery from the System, Figure 42.Go
  • Changed section - Half-Wave AdaptorsGo