SLUS821J October   2008  – May 2017

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  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 Timing Requirements
    7. 7.7 Typical Characteristics
  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 Voltage Dynamic Power Management, (VIN_DPM)
          2. 8.3.3.1.2 Dynamic Power Path Management (DPPM)
          3. 8.3.3.1.3 Battery Supplement Mode
        2. 8.3.3.2 Input Source Not Connected
      4. 8.3.4 Thermal Regulation and Thermal Shutdown
      5. 8.3.5 Battery Pack Temperature Monitoring
        1. 8.3.5.1 Modifying / Extending the Allowable Temperature Range for Charging
    4. 8.4 Device Functional Modes
      1. 8.4.1 Battery Charging
        1. 8.4.1.1 Charge Current Translator
        2. 8.4.1.2 Battery Detection and Recharge
        3. 8.4.1.3 Termination Disable (TD Input, bq24230)
        4. 8.4.1.4 Adjustable Termination Threshold (ITERM Input, bq24232)
        5. 8.4.1.5 Dynamic Charge Timers (TMR Input)
        6. 8.4.1.6 Status Indicators (PGOOD, CHG)
          1. 8.4.1.6.1 Timer Fault
      2. 8.4.2 Explanation of Deglitch Times and Comparator Hysteresis
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Using The bq24232 In A Stand-Alone Charger Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Calculations
            1. 9.2.1.2.1.1 Program The Fast-Charge Current (ISET):
            2. 9.2.1.2.1.2 Program The Input Current Limit (ILIM)
            3. 9.2.1.2.1.3 Program The Termination Current Threshold (ITERM, bq24232)
            4. 9.2.1.2.1.4 Program 7.5-hour Fast-Charge Safety Timer (TMR)
          2. 9.2.1.2.2 TS Function
          3. 9.2.1.2.3 CHG and PGOOD
          4. 9.2.1.2.4 Selecting In, Out, and BAT Pin Capacitors
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Using The bq24230 in a Host Controlled Charger Application
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
  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

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Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

Application Information

The bq2423x devices power the system while simultaneously and independently charging the battery. The input power source for charging the battery and running the system can be an AC adapter or a USB port. The devices feature dynamic power-path management (DPPM), which shares the source current between the system and battery charging and automatically reduces the charging current if the system load increases. When charging from a USB port, the input dynamic power management (VIN-DPM) circuit reduces the input current limit if the input voltage falls below a threshold, preventing the USB port from crashing. The power-path architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents.

The bq2423x can be configured as host controlled for selecting different input current limits based on the input source connected; or, as a fully stand-alone device for applications that do not support multiple types of input sources.

Typical Applications

Using The bq24232 In A Stand-Alone Charger Application

See Figure 22 for the Design Example Schematic.

VIN = VUVLO to VOVP , IFASTCHG = 200 mA, IIN(MAX) = 500 mA, 25-mA Termination Current, ISET mode (EN1=0, EN2=1), Battery Temperature Charge Range 0°C to 50°C, 7.5-hour Fast Charge Safety Timer.

bq24230 bq24232 app_cir2_lus821.gif Figure 22. Using The bq24232 in a Stand-Alone Charger Application

Design Requirements

  • Supply voltage = 5 V
  • Fast-charge current of approximately 200 mA; ISET - pin 16
  • Input Current Limit =500 mA; ILIM - pin 12
  • Termination Current = 25 mA - pin 15 (bq24232)
  • Safety timer duration, Fast charge = 7.5 hours; TMR – pin 14
  • TS – Battery Temperature Sense = 10 kΩ NTC (103AT-2)

Detailed Design Procedure

Calculations

Program The Fast-Charge Current (ISET):

RISET = KISET / ICHG

KISET = 870 AΩ from the electrical characteristics table.

RISET = 870 AΩ/0.2 A = 4.35kΩ

Select the closest standard value, which for this case is 4.32 kΩ. Connect this resistor between ISET (pin 16) and VSS.

Program The Input Current Limit (ILIM)

RILIM = KILIM / II_MAX

KILIM = 1530 AΩ from the electrical characteristics table.

RISET = 1530 AΩ / 0.5 A = 3.06 kΩ

Select the closest standard value, which for this case is 3.06 kΩ. Connect this resistor between ILIM (pin 12) and VSS.

Program The Termination Current Threshold (ITERM, bq24232)

RITERM = RISET × ITERM / KITERM

KITERM = 0.03 A from electrical characteristics table

RITERM = 4.32 kΩ × 0.025 A/0.03 A = 3.6 kΩ

Select the closest standard value, which for this case is 3.57 kΩ. Connect this resistor between ITERM (pin 15) and VSS

Program 7.5-hour Fast-Charge Safety Timer (TMR)

RTMR = tMAXCHG / (10 × KTMR )

KTMR = 48 s/kΩ from the electrical characteristics table.

RTMR = (7.5 hr × 3600 s/hr) / (10 × 48 s/kΩ) = 56.25 kΩ

Select the closest standard value, which for this case is 56.2 kΩ. Connect this resistor between TMR (pin 2) and VSS.

TS Function

Use a 10-kΩ NTC thermistor in the battery pack (103AT). To disable the temperature sense function, use a fixed 10-kΩ resistor between the TS (pin 1) and VSS. Pay close attention to the linearity of the chosen NTC so that it provides the desired hot and cold turnoff thresholds.

CHG and PGOOD

LED Status: connect a 1.5-kΩ resistor in series with a LED between OUT and CHG and OUT and PGOOD.

Processor Monitoring Status: connect a pullup resistor (approximately 100 kΩ) between the processor’s power rail and CHG and PGOOD.

Selecting In, Out, and BAT Pin Capacitors

In most applications, all that is needed is a high-frequency decoupling capacitor (ceramic) on the power pin, input, output, and battery pins. Using the values shown on the application diagram is recommended. After evaluation of these voltage signals with real system operational conditions, the user can determine if capacitance values can be adjusted toward the minimum recommended values (dc load application) or higher values for fast, high-amplitude, pulsed load applications. Note, if the application is designed with high input voltage sources (bad adapters or wrong adapters), the capacitor needs to be rated appropriately. Ceramic capacitors are tested to 2x their rated values so a 16-V capacitor may be adequate for a 30-V transient (verify the tested rating with capacitor manufacturer).

Application Curves

bq24230 bq24232 batt_conn_lus821.gif
RLOAD = 25Ω
Figure 23. Adapter Plug-In With Battery Connected
bq24230 bq24232 batt_rem_lus821.gif
Figure 25. Battery Detection -- Removal
bq24230 bq24232 batt_det_lus821.gif
Figure 24. Battery Detection -- Insertion
bq24230 bq24232 dppm_mode_lus821.gif
RLOAD = 25Ω To 9Ω
Figure 26. Entering And Exiting DPPM Mode
bq24230 bq24232 supp_mode_lus821.gif
RLOAD = 25Ω To 4.5Ω
Figure 27. Entering And Exiting Battery Supplement Mode
bq24230 bq24232 ovp_fault_lus821.gif
RLOAD = 25Ω
Figure 29. OVP Fault VIN = 6 V To 15 V
bq24230 bq24232 on_off_chgr_lus821.gif
Figure 28. Charger ON/OFF Using CE

Using The bq24230 in a Host Controlled Charger Application

See Figure 30 for the Design Example Schematic.

VIN = VUVLO to VOVP , IFASTCHG = 200 mA, IIN(MAX) = 500 mA, Battery Temperature Charge Range 0°C to 50°C, 7.5-hour Fast Charge Safety Timer.

bq24230 bq24232 app_cir1_lus821.gif Figure 30. Using The bq24230 in a Host Controlled Charger Application

Design Requirements

See the bq24232 Design Requirements.

Detailed Design Procedure

See the bq24232 Detailed Design Procedure.

Application Curves

See the bq24232 Application Curves.