SLUSDF9 June   2020 BQ25790

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1.     Simplified Schematic
      1.      Device Images
  4. Revision History
  5. Description (continued)
  6. Pin Configuration and Functions
    1.     Pin 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  Device Power-On-Reset
      2. 8.3.2  PROG Pin Configuration
      3. 8.3.3  Dual-Input Power Mux
        1. 8.3.3.1 VBUS Input Only
        2. 8.3.3.2 One ACFET-RBFET
        3. 8.3.3.3 Two ACFETs-RBFETs
      4. 8.3.4  Device Power Up from Battery without Input Source
      5. 8.3.5  Device Power Up from Input Source
        1. 8.3.5.1 Power Up REGN LDO
        2. 8.3.5.2 Poor Source Qualification
        3. 8.3.5.3 Input Source Type Detection
          1. 8.3.5.3.1 D+/D– Detection Sets Input Current Limit
          2. 8.3.5.3.2 Force Input Current Limit Detection
          3. 8.3.5.3.3 Connector Fault Detection
        4. 8.3.5.4 Input Current Optimizer (ICO)
        5. 8.3.5.5 Default VINDPM Setting
        6. 8.3.5.6 Device HIZ State
        7. 8.3.5.7 ILIM_HIZ Pin
        8. 8.3.5.8 IBAT Pin for Battery Current Sensing
        9. 8.3.5.9 Buck-Boost Converter Operation
          1. 8.3.5.9.1 Pulse Frequency Modulation (PFM)
      6. 8.3.6  USB On-The-Go (OTG)
        1. 8.3.6.1 OTG Mode to Power External Devices
      7. 8.3.7  Power Path Management
        1. 8.3.7.1 Narrow VDC Architecture
        2. 8.3.7.2 Dynamic Power Management
      8. 8.3.8  Battery Charging Management
        1. 8.3.8.1 Autonomous Charging Cycle
        2. 8.3.8.2 Battery Charging Profile
        3. 8.3.8.3 Charging Termination
        4. 8.3.8.4 Charging Safety Timer
        5. 8.3.8.5 Thermistor Qualification
          1. 8.3.8.5.1 JEITA Guideline Compliance in Charge Mode
          2. 8.3.8.5.2 Cold/Hot Temperature Window in OTG Mode
      9. 8.3.9  Integrated 16-Bit ADC for Monitoring
      10. 8.3.10 Status Outputs (PG, STAT, and INT)
        1. 8.3.10.1 Power Good Indicator (PG)
        2. 8.3.10.2 Charging Status Indicator (STAT Pin)
        3. 8.3.10.3 Interrupt to Host (INT)
      11. 8.3.11 Ship FET Control
        1. 8.3.11.1 Shutdown Mode
        2. 8.3.11.2 Ship Mode
        3. 8.3.11.3 System Power Reset
      12. 8.3.12 Protections
        1. 8.3.12.1 Voltage and Current Monitoring
        2. 8.3.12.2 Thermal Regulation and Thermal Shutdown
      13. 8.3.13 Serial Interface
        1. 8.3.13.1 Data Validity
        2. 8.3.13.2 START and STOP Conditions
        3. 8.3.13.3 Byte Format
        4. 8.3.13.4 Acknowledge (ACK) and Not Acknowledge (NACK)
        5. 8.3.13.5 Slave Address and Data Direction Bit
        6. 8.3.13.6 Single Write and Read
        7. 8.3.13.7 Multi-Write and Multi-Read
    4. 8.4 Device Functional Modes
      1. 8.4.1 Host Mode and Default Mode
      2. 8.4.2 Register Bit Reset
    5. 8.5 Register Map
      1. 8.5.1 I2C Registers
        1. 8.5.1.1  REG00_Minimal_System_Voltage Register (Offset = 0h) [reset = X]
          1. Table 10. REG00_Minimal_System_Voltage Register Field Descriptions
        2. 8.5.1.2  REG01_Charge_Voltage_Limit Register (Offset = 1h) [reset = X]
          1. Table 11. REG01_Charge_Voltage_Limit Register Field Descriptions
        3. 8.5.1.3  REG03_Charge_Current_Limit Register (Offset = 3h) [reset = X]
          1. Table 12. REG03_Charge_Current_Limit Register Field Descriptions
        4. 8.5.1.4  REG05_Input_Voltage_Limit Register (Offset = 5h) [reset = 24h]
          1. Table 13. REG05_Input_Voltage_Limit Register Field Descriptions
        5. 8.5.1.5  REG06_Input_Current_Limit Register (Offset = 6h) [reset = 12Ch]
          1. Table 14. REG06_Input_Current_Limit Register Field Descriptions
        6. 8.5.1.6  REG08_Precharge_Control Register (Offset = 8h) [reset = C3h]
          1. Table 15. REG08_Precharge_Control Register Field Descriptions
        7. 8.5.1.7  REG09_Termination_Control Register (Offset = 9h) [reset = 5h]
          1. Table 16. REG09_Termination_Control Register Field Descriptions
        8. 8.5.1.8  REG0A_Re-charge_Control Register (Offset = Ah) [reset = X]
          1. Table 17. REG0A_Re-charge_Control Register Field Descriptions
        9. 8.5.1.9  REG0B_VOTG_regulation Register (Offset = Bh) [reset = DCh]
          1. Table 18. REG0B_VOTG_regulation Register Field Descriptions
        10. 8.5.1.10 REG0D_IOTG_regulation Register (Offset = Dh) [reset = 4Bh]
          1. Table 19. REG0D_IOTG_regulation Register Field Descriptions
        11. 8.5.1.11 REG0E_Timer_Control Register (Offset = Eh) [reset = 3Dh]
          1. Table 20. REG0E_Timer_Control Register Field Descriptions
        12. 8.5.1.12 REG0F_Charger_Control_0 Register (Offset = Fh) [reset = A2h]
          1. Table 21. REG0F_Charger_Control_0 Register Field Descriptions
        13. 8.5.1.13 REG10_Charger_Control_1 Register (Offset = 10h) [reset = 85h]
          1. Table 22. REG10_Charger_Control_1 Register Field Descriptions
        14. 8.5.1.14 REG11_Charger_Control_2 Register (Offset = 11h) [reset = 40h]
          1. Table 23. REG11_Charger_Control_2 Register Field Descriptions
        15. 8.5.1.15 REG12_Charger_Control_3 Register (Offset = 12h) [reset = 0h]
          1. Table 24. REG12_Charger_Control_3 Register Field Descriptions
        16. 8.5.1.16 REG13_Charger_Control_4 Register (Offset = 13h) [reset = X]
          1. Table 25. REG13_Charger_Control_4 Register Field Descriptions
        17. 8.5.1.17 REG14_Charger_Control_5 Register (Offset = 14h) [reset = 16h]
          1. Table 26. REG14_Charger_Control_5 Register Field Descriptions
        18. 8.5.1.18 REG15_Reserved Register (Offset = 15h) [reset = 00h]
          1. Table 27. REG15_Reserved Register Field Descriptions
        19. 8.5.1.19 REG16_Temperature_Control Register (Offset = 16h) [reset = C0h]
          1. Table 28. REG16_Temperature_Control Register Field Descriptions
        20. 8.5.1.20 REG17_NTC_Control_0 Register (Offset = 17h) [reset = 7Ah]
          1. Table 29. REG17_NTC_Control_0 Register Field Descriptions
        21. 8.5.1.21 REG18_NTC_Control_1 Register (Offset = 18h) [reset = 54h]
          1. Table 30. REG18_NTC_Control_1 Register Field Descriptions
        22. 8.5.1.22 REG19_ICO_Current_Limit Register (Offset = 19h) [reset = 0h]
          1. Table 31. REG19_ICO_Current_Limit Register Field Descriptions
        23. 8.5.1.23 REG1B_Charger_Status_0 Register (Offset = 1Bh) [reset = 0h]
          1. Table 32. REG1B_Charger_Status_0 Register Field Descriptions
        24. 8.5.1.24 REG1C_Charger_Status_1 Register (Offset = 1Ch) [reset = 0h]
          1. Table 33. REG1C_Charger_Status_1 Register Field Descriptions
        25. 8.5.1.25 REG1D_Charger_Status_2 Register (Offset = 1Dh) [reset = 0h]
          1. Table 34. REG1D_Charger_Status_2 Register Field Descriptions
        26. 8.5.1.26 REG1E_Charger_Status_3 Register (Offset = 1Eh) [reset = 0h]
          1. Table 35. REG1E_Charger_Status_3 Register Field Descriptions
        27. 8.5.1.27 REG1F_Charger_Status_4 Register (Offset = 1Fh) [reset = 0h]
          1. Table 36. REG1F_Charger_Status_4 Register Field Descriptions
        28. 8.5.1.28 REG20_FAULT_Status_0 Register (Offset = 20h) [reset = 0h]
          1. Table 37. REG20_FAULT_Status_0 Register Field Descriptions
        29. 8.5.1.29 REG21_FAULT_Status_1 Register (Offset = 21h) [reset = 0h]
          1. Table 38. REG21_FAULT_Status_1 Register Field Descriptions
        30. 8.5.1.30 REG22_Charger_Flag_0 Register (Offset = 22h) [reset = 0h]
          1. Table 39. REG22_Charger_Flag_0 Register Field Descriptions
        31. 8.5.1.31 REG23_Charger_Flag_1 Register (Offset = 23h) [reset = 0h]
          1. Table 40. REG23_Charger_Flag_1 Register Field Descriptions
        32. 8.5.1.32 REG24_Charger_Flag_2 Register (Offset = 24h) [reset = 0h]
          1. Table 41. REG24_Charger_Flag_2 Register Field Descriptions
        33. 8.5.1.33 REG25_Charger_Flag_3 Register (Offset = 25h) [reset = 0h]
          1. Table 42. REG25_Charger_Flag_3 Register Field Descriptions
        34. 8.5.1.34 REG26_FAULT_Flag_0 Register (Offset = 26h) [reset = 0h]
          1. Table 43. REG26_FAULT_Flag_0 Register Field Descriptions
        35. 8.5.1.35 REG27_FAULT_Flag_1 Register (Offset = 27h) [reset = 0h]
          1. Table 44. REG27_FAULT_Flag_1 Register Field Descriptions
        36. 8.5.1.36 REG28_Charger_Mask_0 Register (Offset = 28h) [reset = 0h]
          1. Table 45. REG28_Charger_Mask_0 Register Field Descriptions
        37. 8.5.1.37 REG29_Charger_Mask_1 Register (Offset = 29h) [reset = 0h]
          1. Table 46. REG29_Charger_Mask_1 Register Field Descriptions
        38. 8.5.1.38 REG2A_Charger_Mask_2 Register (Offset = 2Ah) [reset = 0h]
          1. Table 47. REG2A_Charger_Mask_2 Register Field Descriptions
        39. 8.5.1.39 REG2B_Charger_Mask_3 Register (Offset = 2Bh) [reset = 0h]
          1. Table 48. REG2B_Charger_Mask_3 Register Field Descriptions
        40. 8.5.1.40 REG2C_FAULT_Mask_0 Register (Offset = 2Ch) [reset = 0h]
          1. Table 49. REG2C_FAULT_Mask_0 Register Field Descriptions
        41. 8.5.1.41 REG2D_FAULT_Mask_1 Register (Offset = 2Dh) [reset = 0h]
          1. Table 50. REG2D_FAULT_Mask_1 Register Field Descriptions
        42. 8.5.1.42 REG2E_ADC_Control Register (Offset = 2Eh) [reset = 30h]
          1. Table 51. REG2E_ADC_Control Register Field Descriptions
        43. 8.5.1.43 REG2F_ADC_Function_Disable_0 Register (Offset = 2Fh) [reset = 0h]
          1. Table 52. REG2F_ADC_Function_Disable_0 Register Field Descriptions
        44. 8.5.1.44 REG30_ADC_Function_Disable_1 Register (Offset = 30h) [reset = 0h]
          1. Table 53. REG30_ADC_Function_Disable_1 Register Field Descriptions
        45. 8.5.1.45 REG31_IBUS_ADC Register (Offset = 31h) [reset = 0h]
          1. Table 54. REG31_IBUS_ADC Register Field Descriptions
        46. 8.5.1.46 REG33_IBAT_ADC Register (Offset = 33h) [reset = 0h]
          1. Table 55. REG33_IBAT_ADC Register Field Descriptions
        47. 8.5.1.47 REG35_VBUS_ADC Register (Offset = 35h) [reset = 0h]
          1. Table 56. REG35_VBUS_ADC Register Field Descriptions
        48. 8.5.1.48 REG37_VAC1_ADC Register (Offset = 37h) [reset = 0h]
          1. Table 57. REG37_VAC1_ADC Register Field Descriptions
        49. 8.5.1.49 REG39_VAC2_ADC Register (Offset = 39h) [reset = 0h]
          1. Table 58. REG39_VAC2_ADC Register Field Descriptions
        50. 8.5.1.50 REG3B_VBAT_ADC Register (Offset = 3Bh) [reset = 0h]
          1. Table 59. REG3B_VBAT_ADC Register Field Descriptions
        51. 8.5.1.51 REG3D_VSYS_ADC Register (Offset = 3Dh) [reset = 0h]
          1. Table 60. REG3D_VSYS_ADC Register Field Descriptions
        52. 8.5.1.52 REG3F_TS_ADC Register (Offset = 3Fh) [reset = 0h]
          1. Table 61. REG3F_TS_ADC Register Field Descriptions
        53. 8.5.1.53 REG41_TDIE_ADC Register (Offset = 41h) [reset = 0h]
          1. Table 62. REG41_TDIE_ADC Register Field Descriptions
        54. 8.5.1.54 REG43_D+_ADC Register (Offset = 43h) [reset = 0h]
          1. Table 63. REG43_D+_ADC Register Field Descriptions
        55. 8.5.1.55 REG45_D-_ADC Register (Offset = 45h) [reset = 0h]
          1. Table 64. REG45_D-_ADC Register Field Descriptions
        56. 8.5.1.56 REG47_DPDM_Driver Register (Offset = 47h) [reset = 0h]
          1. Table 65. REG47_DPDM_Driver Register Field Descriptions
        57. 8.5.1.57 REG48_Part_Information Register (Offset = 48h) [reset = 0h]
          1. Table 66. REG48_Part_Information Register Field Descriptions
  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 Inductor Selection
        2. 9.2.2.2 Input (VBUS / PMID) Capacitor
        3. 9.2.2.3 Output (VSYS) Capacitor
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
        1. 12.1.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Inductor Selection

The device has 1.5 MHz switching frequency to allow the use of small inductor (1µH) and capacitor values. It also provide the 750kHz switching frequency to achieve higher efficiency for the applications which have enough design space to accommodate the larger inductor (2.2 µH) and capacitors. Please note that the 1.5 MHz switching frequency only works with the 1µH inductor and the 750 kHz switching frequency only works with the 2.2µH inductor.

Because the converter might be either operated in the buck mode or the boost mode, so the inductor current is equal to either the charging current or the input current. The inductor saturation current should be higher than the larger value of the input current (IIN) or the charging current (ICHG) plus half the ripple current (IRIPPLE):

Equation 3. BQ25790 ISAT_eqn5.gif

The inductor ripple current (IRIPPLE) depends on the input voltage (VBUS), the output voltage (VSYS), the switching frequency (FSW) and the inductance (L). The inductor current ripples for buck mode and boost mode are calculated with equations (4) and (5), respectively:

Equation 4. BQ25790 IRIPPLE_eqn4.gif
Equation 5. BQ25790 IRIPPLE_eqn6.gif

The inductor current ripple in the buck mode is usually larger than that in the boost mode, since the voltage-second applied on the inductor is larger. The maximum inductor current ripple in the buck mode happens in the vicinity of D = VSYS / VBUS = 0.5. The SYS voltage is approximately 8V for the 2s battery configuration, so the worst case for the inductor ripples is with the 15V or 20V input voltage.