SLUSG51A October   2025  – August 2026 BQ25692-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Device Power-On-Reset
      2. 6.3.2  Battery Only Power Up State
      3. 6.3.3  Device HIZ State
      4. 6.3.4  Power Up REGN LDO
      5. 6.3.5  Default VINDPM Setting
      6. 6.3.6  Default Charge Profile Setting With CELL, ICHG and VCHG Pins
      7. 6.3.7  Buck-Boost Converter Operation
        1. 6.3.7.1 Pulse Frequency Modulation (PFM)
        2. 6.3.7.2 Switching Frequency and Dithering Feature
      8. 6.3.8  Forward (Sink) Operation
        1. 6.3.8.1 Power Path Management
          1. 6.3.8.1.1 Dynamic Power Management
            1. 6.3.8.1.1.1 ILIM_HIZ Pin
            2. 6.3.8.1.1.2 Input Current Optimizer (ICO)
          2. 6.3.8.1.2 Maximum Power Point Tracking for Small PV Panel
        2. 6.3.8.2 Battery Charging Management
          1. 6.3.8.2.1 Battery Detection
          2. 6.3.8.2.2 Autonomous Charging Cycle
          3. 6.3.8.2.3 Battery Charging Profile
          4. 6.3.8.2.4 Charging Termination
          5. 6.3.8.2.5 Charging Safety Timer
          6. 6.3.8.2.6 CV Timer
          7. 6.3.8.2.7 Thermistor Qualification
            1. 6.3.8.2.7.1 JEITA Guideline Compliance in Charge Mode
            2. 6.3.8.2.7.2 Cold/Hot Temperature Window in Reverse Mode
        3. 6.3.8.3 Bypass Mode
      9. 6.3.9  Reverse (Source) Mode (USB On-The-Go)
        1. 6.3.9.1 Reverse (Source) Mode Operation
        2. 6.3.9.2 Backup Power Supply Mode
        3. 6.3.9.3 Reverse Bypass Mode
      10. 6.3.10 Status Outputs (STAT and INT)
        1. 6.3.10.1 Power Good Indicator (PG_STAT)
        2. 6.3.10.2 Charging Status Indicator (STAT Pin)
        3. 6.3.10.3 Interrupt to Host ( INT)
      11. 6.3.11 Serial Interface
        1. 6.3.11.1 Data Validity
        2. 6.3.11.2 START and STOP Conditions
        3. 6.3.11.3 Byte Format
        4. 6.3.11.4 Acknowledge (ACK) and Not Acknowledge (NACK)
        5. 6.3.11.5 Target Address and Data Direction Bit
        6. 6.3.11.6 Single Write and Read
        7. 6.3.11.7 Multi-Write and Multi-Read
    4. 6.4 Device Functional Modes
      1. 6.4.1 Host Mode and Default Mode
      2. 6.4.2 Register Bit Reset
  8. 7 Register Map
    1. 7.1 BQ25692Q1 Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application Design Example
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Inductor Selection
        2. 8.2.2.2 Capacitors
        3. 8.2.2.3 Buck Mode Input (VIN) Capacitor
        4. 8.2.2.4 Boost Mode Output (VOUT) Capacitor
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
6.3.8.2.7.1 JEITA Guideline Compliance in Charge Mode

JEITA guideline from April 20, 2007 highlights information for improving the safety of charging Li-ion batteries. The guideline emphasizes the importance of avoiding a high charge current and high charge voltage at certain low and high temperature ranges.

To initiate a charge cycle, verify that the voltage on TS pin is within the VT1 to VT5 thresholds. If TS voltage exceeds the T1 – T5 range, the controller suspends charging and waits until the battery temperature is within the T1 – T5 range. At cool temperature (T1 – T2), JEITA recommends reducing the charge current to half of the charge current or lower. At warm temperature (T3 – T5), JEITA recommends charging the voltage less than 4.1V per cell.

At cool temperature T1 – T2, JEITA recommends reducing the charge current to lower than half of the charge current at normal temperature T2 – T3. The device provides the programmability of the charge current at T1 – T2 an 20%, 40% or 100% of the charge current at T2 – T3 or charge suspend, which is controlled by the register bits JEITA_ISETC.

At warm temperature T3 – T5, JEITA recommends charge voltage less than 4.1V / cell. The device provides the programmability of the charge voltage at T3 – T5, to be with a voltage offset less than charge voltage at T2 – T3 or charge suspend, which is controlled by the register bits JEITA_VSET.

The charger also provides flexible voltage/current settings beyond the JEITA requirements. The charge current setting at warm temperature T3 – T5 can be configured to be 40%, or 100% of the programmed charge current or charge suspend, which is programmed by the register bit JEITA_ISETH.

The default charging profile for JEITA is shown in the figure below, in which the blue line is the default setting and the red dash line is the programmable options.

BQ25692-Q1 TS Charging Values Figure 6-4 TS Charging Values
BQ25692-Q1 TS Resistor Network Figure 6-5 TS Resistor Network

Assuming a 103AT NTC thermistor on the battery pack as shown above, the value of RT1 and RT2 can be determined by:

Equation 3. R T 2 = R T H C O L D × R T H H O T × 1 V T 1 - 1 V T 5 R T H H O T × 1 V T 5 - 1 - R T H C O L D × 1 V T 1 - 1
Equation 4. R T 1 = 1 V T 1 - 1 1 R T 2 + 1 R T H C O L D

Select 0°C to 60°C range for Li-ion or Li-polymer battery:

  • RTHT1 = 27.28kΩ
  • RTHT5 = 3.02kΩ
  • RT1 = 5.23kΩ
  • RT2 = 30.1kΩ

The device also offers programmability for all the thresholds using the TS charging threshold control register. This flexibility can help to change the operating window of the charger in software.

Disable the JEITA profile by clearing the EN_JEITA register bit. In this case, the device still limits the charging window from T1 – T5, but no special charge profile is employed within the Cool (T1 – T2) or Warm (T3 – T5) regions.

Disable the NTC monitoring window by clearing the EN_TS register bit. In this case, the TS pin voltage is ignored, and the device always reports normal TS status.