SLUS821J October   2008  – May 2017


  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. Input Source Connected - Adapter or USB
          1. Input Voltage Dynamic Power Management, (VIN_DPM)
          2. Dynamic Power Path Management (DPPM)
          3. Battery Supplement Mode
        2. Input Source Not Connected
      4. 8.3.4 Thermal Regulation and Thermal Shutdown
      5. 8.3.5 Battery Pack Temperature Monitoring
        1. Modifying / Extending the Allowable Temperature Range for Charging
    4. 8.4 Device Functional Modes
      1. 8.4.1 Battery Charging
        1. Charge Current Translator
        2. Battery Detection and Recharge
        3. Termination Disable (TD Input, bq24230)
        4. Adjustable Termination Threshold (ITERM Input, bq24232)
        5. Dynamic Charge Timers (TMR Input)
        6. Status Indicators (PGOOD, CHG)
          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. Design Requirements
        2. Detailed Design Procedure
          1. Calculations
            1. Program The Fast-Charge Current (ISET):
            2. Program The Input Current Limit (ILIM)
            3. Program The Termination Current Threshold (ITERM, bq24232)
            4. Program 7.5-hour Fast-Charge Safety Timer (TMR)
          2. TS Function
          3. CHG and PGOOD
          4. Selecting In, Out, and BAT Pin Capacitors
        3. Application Curves
      2. 9.2.2 Using The bq24230 in a Host Controlled Charger Application
        1. Design Requirements
        2. Detailed Design Procedure
        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

Package Options

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

Pin Configuration and Functions

16-Pin RGT Package with Thermal Pad
(Top View)
bq24230 bq24232 term_assn_lus821.gif

Pin Functions

bq24230 bq24232
TS 1 1 I External NTC Thermistor Input. Connect the TS input to the NTC thermistor in the battery pack. TS monitors a 10-kΩ NTC thermistor. For applications that do not utilize the TS function, connect a 10-kΩ fixed resistor from TS to VSS to maintain a valid voltage level on TS.
BAT 2,3 2, 3 I/O Charger Power Stage Output and Battery Voltage Sense Input. Connect BAT to the positive terminal of the battery. Bypass BAT to VSS with a 4.7-μF to 47-μF ceramic capacitor.
CE 4 4 I Charge Enable Active-Low Input. Connect CE to a high logic level to disable battery charging. OUT is active and battery supplement mode is still available. Connect CE to a low logic level to enable the battery charger. CE is internally pulled down with ~285 kΩ. Do not leave CE unconnected to ensure proper operation.
EN2 5 5 I Input Current Limit Configuration Inputs. Use EN1 and EN2 control the maximum input current and enable USB compliance. See Table 1 for the description of the operation states. EN1 and EN2 are internally pulled down with ~285 kΩ. Do not leave EN1 or EN2 unconnected to ensure proper operation.
EN1 6 6 I
PGOOD 7 7 O Open-drain Power Good Status Indication Output. PGOOD pulls to VSS when a valid input source is detected. PGOOD is high-impedance when the input power is not within specified limits. Connect PGOOD to the desired logic voltage rail using a 1-kΩ – 100-kΩ resistor, or use with an LED for visual indication.
VSS 8 8 Ground. Connect to the thermal pad and to the ground rail of the circuit.
CHG 9 9 O Open-Drain Charging Status Indication Output. CHG pulls to VSS when the battery is charging. CHG is high impedance when charging is complete and when charger is disabled.
OUT 10,11 10, 11 O System Supply Output. OUT provides a regulated output when the input is below the OVP threshold and above the regulation voltage. When the input is out of the operation range, OUT is connected to VBAT. Connect OUT to the system load. Bypass OUT to VSS with a 4.7-μF to 47-μF ceramic capacitor.
ILIM 12 12 I Adjustable Current Limit Programming Input. Connect a 3.1-kΩ to 7.8-kΩ resistor from ILIM to VSS to program the maximum input current (EN2=1, EN1=0). The input current includes the system load and the battery charge current. Leaving ILIM unconnected disables all charging. In USB100/500 mode (EN2 = 0, EN1= 0/1), ILIM can be left floating.
IN 13 13 I Input Power Connection. Connect IN to the connected to external DC supply (AC adapter or USB port). The input operating range is 4.35 V to 6.6 V. The input can accept voltages up to 26 V without damage but operation is suspended. Connect bypass capacitor 1 μF to 10 μF to VSS.
TMR 14 14 I Timer Programming Input. TMR controls the precharge and fast-charge safety timers. Connect TMR to VSS to disable all safety timers. Connect a 18-kΩ to 72-kΩ resistor between TMR and VSS to program the timers a desired length. Leave TMR unconnected to set the timers to the 5-hour fast charge and 30-minute precharge default timer values.
TD 15 - I Termination Dsable Input. Connect TD high to disable charger termination. Connect TD to VSS to enable charger termination. TD is checked during start-up only and cannot be changed during operation. See the TD section in this data sheet for a description of the behavior when termination is disabled. TD is internally pulled down to VSS with ~285 kΩ. Do not leave TD unconnected to ensure proper operation.
ITERM - 15 I Termination Current Programming Input. Connect a 0-Ω to 15-kΩ resistor from ITERM to VSS to program the termination current. Leave ITERM unconnected to set the termination current to the internal default 10% threshold.
ISET 16 16 I/O Fast-Charge Current Programming Input. Connect a 1.8-kΩ to 36-kΩ resistor from ISET to VSS to program the fast-charge current level. Charging is disabled if ISET is left unconnected. While charging, the voltage at ISET reflects the actual charging current and can be used to monitor charge current. See the Charge Current Translator section for more details.
Thermal Pad An internal electrical connection exists between the exposed thermal pad and the VSS pin of the device. The thermal pad must be connected to the same potential as the VSS pin on the printed-circuit board. Do not use the thermal pad as the primary ground input for the device. The VSS pin must be connected to ground at all times.

Table 1. EN1/EN2 Settings

EN2 EN1 Maximum Input Current Into IN Pin
0 0 100 mA. USB100 mode
0 1 500 mA. USB500 mode
1 0 Set by an external resistor from ILIM to VSS
1 1 Standby (USB suspend mode)