SLVSI59 April   2026 TPS61382A-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 I2C 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 VCC Power Supply and UVLO Logic
      2. 6.3.2 Enable or Shutdown
      3. 6.3.3 STATUS Pin
      4. 6.3.4 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Charger Mode Description
        1. 6.4.1.1 Charger Enable
        2. 6.4.1.2 LDO Charger and Buck Charger Description
          1. 6.4.1.2.1 Buck Charger
          2. 6.4.1.2.2 LDO Charger
        3. 6.4.1.3 NiMH Battery Charging Profile
          1. 6.4.1.3.1 Manual Charge Mode
        4. 6.4.1.4 Lithium Battery Charging Profile
        5. 6.4.1.5 Battery Cold, Hot Temperature (TS Pin)
        6. 6.4.1.6 Charger Protection and Fault Condition Indication
      2. 6.4.2 Boost Feature Description
        1. 6.4.2.1 Enable and Start up
          1. 6.4.2.1.1 Automatic Transition into Boost Mode
          2. 6.4.2.1.2 Manual Transition into Boost Mode
        2. 6.4.2.2 Down Mode
        3. 6.4.2.3 Output Short-to-Ground Protection
        4. 6.4.2.4 Boost Control Loop
        5. 6.4.2.5 Current Limit Operation
        6. 6.4.2.6 Functional Modes at Light Load
          1. 6.4.2.6.1 Auto PFM Mode
          2. 6.4.2.6.2 Forced PWM Mode
        7. 6.4.2.7 Duty Cycle Limitation and Frequency Fold
        8. 6.4.2.8 BUB Voltage Loop
      3. 6.4.3 Spread Spectrum
      4. 6.4.4 Battery State-of-Health (SOH) Detection Feature Description
        1. 6.4.4.1 SOH Mode Operation
        2. 6.4.4.2 Multi-Signal Output in AVI Pin
        3. 6.4.4.3 Calculate Impedance of BUB
        4. 6.4.4.4 Calculate Temperature of Back up Battery
    5. 6.5 I2C Serial Interface
      1. 6.5.1 Data Validity
      2. 6.5.2 START and STOP Conditions
      3. 6.5.3 Byte Format
      4. 6.5.4 Acknowledge (ACK) and Not Acknowledge (NACK)
      5. 6.5.5 Receiver Address and Data Direction Bit
      6. 6.5.6 Single Read and Write
      7. 6.5.7 Multi-Read and Multi-Write
  8. 7 Register Maps
    1. 7.1  Register 00H: CHIP_ID
    2. 7.2  Register 01H: BOOST_SET1
    3. 7.3  Register 02H: BOOST_SET2
    4. 7.4  Register 03H: BOOST_SET3
    5. 7.5  Register 04H: CHGR_SET1
    6. 7.6  Register 05H: CHGR_SET2
    7. 7.7  Register 06H: CHGR_SET3
    8. 7.8  Register 07H: CHGR_SET4
    9. 7.9  Register 08H: CHGR_STATUS
    10. 7.10 Register 09H: SOH_SET1
    11. 7.11 Register 0AH: SOH_SET2
    12. 7.12 Register 0BH: CONTROL_STATUS
    13. 7.13 Register 0CH: FAULT_CONDITION
    14. 7.14 Register 0DH: STATUS_PIN_SET
    15. 7.15 Register 0EH: SW_RST
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Selecting the External MOSFET
        2. 8.2.2.2 Selecting the Schottky Diode on IL Pin
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Capacitor in Backup Battery Side
        5. 8.2.2.5 Selecting the Output Capacitor
        6. 8.2.2.6 Loop Stability and Compensation Design
          1. 8.2.2.6.1 Small Signal Analysis
          2. 8.2.2.6.2 Loop Compensation Design
      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 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

6.4.2.6 Functional Modes at Light Load

In light load condition, the TPS61382A-Q1 can work in either auto PFM or forced PWM (FPWM) mode to meet different application requirements. Auto PFM mode decreases switching frequency under light load. This strategy reduces switching loss and improves higher efficiency at light load condition. FPWM mode force the converter to keep switching with fixed frequency under light load. FPWM improves EMI performance and reduces output ripple, but sacrifices light load efficiency compared to PFM mode.

TPS61382A-Q1 is configured to auto PFM mode by default. Write I2C BST_PFM bit (Register 01H, BOOST_SET1) as 1 to switch to FPWM mode.

Care must be taken for back up power applications, FPWM allows reverse current into back up battery when VOUT is higher than boost output target. Reverse current into BUB is usually not favorable for the back up battery. So TI recommend PFM mode during transition into boost mode.