SLVS873F June   2015  – September 2021 TPS61098 , TPS610981 , TPS610982 , TPS610985 , TPS610986 , TPS610987

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 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 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Boost Controller Operation
      2. 8.3.2 Pass-Through Operation
      3. 8.3.3 LDO / Load Switch Operation
      4. 8.3.4 Start Up and Power Down
      5. 8.3.5 Over Load Protection
      6. 8.3.6 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation Modes by MODE Pin
        1. 8.4.1.1 Active Mode
        2. 8.4.1.2 Low Power Mode
      2. 8.4.2 Burst Mode Operation under Light Load Condition
      3. 8.4.3 Pass-Through Mode Operation
  9. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 VMAIN to Power MCU and VSUB to Power Subsystem
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Device Choice
          2. 9.2.1.2.2 Maximum Output Current
          3. 9.2.1.2.3 Inductor Selection
          4. 9.2.1.2.4 Capacitor Selection
          5. 9.2.1.2.5 Control Sequence
        3. 9.2.1.3 Application Curves
      2. 9.2.2 VMAIN to Power the System in Low Power Mode
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
      3. 9.2.3 VSUB to Power the System in Active Mode
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
        3. 9.2.3.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 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

8.1 Overview

The TPS61098x is an ultra-low power solution optimized for products powered by either a one-cell or two-cell alkaline, NiCd or NiMH, one-cell coin cell battery or one-cell Li-Ion or Li-polymer battery. To simplify system design and save PCB space, the TPS61098x integrates an LDO or load switch with a boost converter (different configurations for different versions) to provide two output rails in a compact package. The boost output V(MAIN) is designed as an always-on supply to power a main system, and the LDO or load switch output V(SUB) is designed to power peripheral devices and can be turned off.

The TPS61098x features two modes controlled by MODE pin: Active mode and Low Power mode. In Active mode, both outputs are enabled, and the transient response performance of the boost converter and LDO/load switch are enhanced, so it is able to respond load transient quickly. In Low Power mode, the LDO/load switch is disabled, so the peripherals can be disconnected to minimize the battery drain. Besides that, the boost consumes only 300 nA quiescent current in Low Power mode, so up to 88% efficiency at 10 µA load can be achieved to extend the battery run time. The TPS610982 is an exception. Its LDO is always on in both Active mode and Low Power mode. The main differences between the two modes of the TPS610982 are the quiescent current and performance. Refer to Section 8.4.1 for details.

The TPS61098x supports automatic pass-through function in both Active mode and Low Power mode. When VIN is detected higher than a pass-through threshold, which is around the target V(MAIN) voltage, the boost converter stops switching and passes the input voltage through inductor and internal rectifier switch to V(MAIN), so V(MAIN) follows VIN; when VIN is lower than the threshold, the boost works in boost mode and regulates V(MAIN) at the target value. The TPS61098x can support different V(MAIN) target values in Active mode and Low Power mode to meet various requirements. For example, for TPS61098, the set value of V(MAIN) is 4.3 V in Active mode but 2.2 V in Low Power mode.