SLUSAW5B January   2012  – December 2014


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Description (Continued)
  6. Device Comparison Table
  7. Pin Configuration and Functions
  8. Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Device Power Up
        1. Power-On-Reset (POR)
        2. Power Up from Battery without DC Source
          1. BATFET Turn Off
          2. Shipping Mode
        3. Power Up from DC Source
          1. REGN LDO
          2. Input Source Qualification
          3. Input Current Limit Detection
          4. D+/D- Detection Sets Input Current Limit in bq24190
          5. PSEL/OTG Pins Set Input Current Limit in bq24192, bq24192I
          6. HIZ State wth 100mA USB Host
          7. Force Input Current Limit Detection
        4. Converter Power-Up
        5. Boost Mode Operation from Battery
      2. 9.3.2 Power Path Management
        1. Narrow VDC Architecture
        2. Dynamic Power Management
        3. Supplement Mode
      3. 9.3.3 Battery Charging Management
        1. Autonomous Charging Cycle
        2. Battery Charging Profile
        3. Battery Path Impedance IR Compensation
        4. Thermistor Qualification
          1. Cold/Hot Temperature Window
        5. Charging Termination
          1. Termination when REG02[0] = 1
          2. Termination when REG05[6] = 1
        6. Charging Safety Timer
        7. USB Timer when Charging from USB100mA Source
      4. 9.3.4 Status Outputs (PG, STAT, and INT)
        1. Power Good Indicator (PG)
        2. Charging Status Indicator (STAT)
        3. Interrupt to Host (INT)
      5. 9.3.5 Protections
        1. Input Current Limit on ILIM
        2. Thermal Regulation and Thermal Shutdown
        3. Voltage and Current Monitoring in Buck Mode
          1. Input Over-Voltage (ACOV)
          2. System Over-Voltage Protection (SYSOVP)
        4. Voltage and Current Monitoring in Boost Mode
          1. VBUS Over-Voltage Protection
        5. Battery Protection
          1. Battery Over-Current Protection (BATOVP)
          2. Charging During Battery Short Protection
          3. System Over-Current Protection
      6. 9.3.6 Serial Interface
        1. Data Validity
        2. START and STOP Conditions
        3. Byte Format
        4. Acknowledge (ACK) and Not Acknowledge (NACK)
        5. Slave Address and Data Direction Bit
          1. Single Read and Write
          2. Multi-Read and Multi-Write
    4. 9.4 Device Functional Modes
      1. 9.4.1 Host Mode and Default Mode
        1. Plug in USB100mA Source with Good Battery
        2. USB Timer when Charging from USB 100-mA Source
    5. 9.5 Register Map
      1. 9.5.1 I2C Registers
        1.  Input Source Control Register REG00 (bq24190, bq24192 reset = 00110000, or 30; bq24192I reset = 00111000, or 38)
        2.  Power-On Configuration Register REG01 (reset = 00011011, or 1B)
        3.  Charge Current Control Register REG02 (bq24190, bq24192 reset = 01100000, or 60; bq24192I reset = 00100000, or 20)
        4.  Pre-Charge/Termination Current Control Register REG03 (reset = 00010001, or 11)
        5.  Charge Voltage Control Register REG04 (bq24190, bq241192 reset = 10110010, or B2; bq24192I reset = 10011010, or 9A)
        6.  Charge Termination/Timer Control Register REG05 (reset = 10011010, or 9A)
        7.  IR Compensation / Thermal Regulation Control Register REG06 (reset = 00000011, or 03)
        8.  Misc Operation Control Register REG07 (reset = 01001011, or 4B)
        9.  System Status Register REG08
        10. Fault Register REG09
        11. Vender / Part / Revision Status Register REG0A (bq24190 reset = 00100011, or 23; bq24192 reset = 00101011, or 2B; bq24192I reset = 00001011, or 0B)
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. Inductor Selection
        2. Input Capacitor
        3. Output Capacitor
      3. 10.2.3 Application Performance Plots
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Related Links
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

5 Description (Continued)

Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

The device supports a wide range of input sources, including standard USB host port, USB charging port and high power DC adapter. To set the default input current limit, the bq24190 detects the input source following the USB battery charging spec 1.2, and the bq24192 and bq24192I take the results from detection circuit in the system, such as USB PHY device. The bq24190,192, and 192I are compliant with USB 2.0 and USB 3.0 power specifications with input current and voltage regulation. Meanwhile, the bq24190, bq24192, and bq24192I meet USB On-the-Go operation power rating specification by supplying 5 V on the VBUS with a current limit up to 1.3 A.

The power path management regulates the system slightly above battery voltage but does not drop below 3.5-V minimum system voltage (programmable). With this feature, the system maintains operation even when the battery is completely depleted or removed. When the input current limit or voltage limit is reached, the power path management automatically reduces the charge current to zero. As the system load continues to increase, the power path discharges the battery until the system power requirement is met. This supplement mode operation prevents overloading the input source.

The devices initiate and complete a charging cycle without software control. It automatically detects the battery voltage and charges the battery in three phases: pre-conditioning, constant current and constant voltage. At the end of the charging cycle, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase. When the full battery falls below the recharge threshold, the charger will automatically start another charging cycle.

The bq24190, bq24192, and bq24192I provide various safety features for battery charging and system operation, including dual pack negative thermistor monitoring, charging safety timer and over-voltage/over-current protections. The thermal regulation reduces charge current when the junction temperature exceeds 120°C (programmable).

The STAT output reports the charging status and any fault conditions. The PG output in the bq24192 and bq24192I indicates if a good power source is present. The INT immediately notifies the host when a fault occurs.

The bq24190, bq24192, and bq24192I are available in a 24-pin, 4.00 x 4.00 mm2 thin VQFN package.