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
6.4.2.6.1 Auto PFM Mode

The TPS61382A-Q1 can apply auto PFM operation to improve efficiency at light load. Auto PFM mode is applied by enabling the PFM function in the internal register. When the TPS61382A-Q1 operates at light load condition, the output of the internal error amplifier decreases to make the inductor peak current down and deliver less power to the load. When the inductor current decreases to ICLAMP_LOW (peak current approximately 4A), the output voltage of the error amplifier is clamped by the internal circuit and does not further reduce. If the load current reduces further, the inductor current is clamped and VOUT increases. When the output voltage hits the PFM reference voltage (101.5% Vout_target), the device pauses switching. The load is supplied by the output capacitor, and the output voltage declines. When the output voltage falls below 100.5% Vout_target, the device starts switching again to ramp up the output voltage.

TPS61382A-Q1 PWM and PFM operationFigure 6-17 PWM and PFM operation