SLVSFH6C January   2021  – December 2021 TPS61094


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
      1. 7.1.1 The Configuration of VCHG Pin, ICHG Pin, and OSEL Pin
        1. OSEL: Output Voltage Selection
        2. VCHG: Charging Termination Voltage Selection
        3. ICHG: Charging Output Current Selection
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Undervoltage Lockout
      2. 7.3.2 Enable and Soft Start
      3. 7.3.3 Active Pulldown for the EN and MODE Pins
      4. 7.3.4 Current Limit Operation
      5. 7.3.5 Output Short-to-Ground Protection
      6. 7.3.6 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation Mode Setting
      2. 7.4.2 Forced Bypass Mode Operation
      3. 7.4.3 True Shutdown Mode Operation
      4. 7.4.4 Forced Buck Mode Operation
      5. 7.4.5 Auto Buck or Boost Mode Operation
        1. Three States (Boost_on, Buck_on, and Supplement) Transition
        2. Boost, Bypass, and Pass-Through
        3. PWM, PFM, and Snooze Modes in Boost Operation
          1. PWM Mode
          2. PFM Mode
          3. Snooze Mode
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application – 3.6-V Output Boost Converter with Bypass
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. Programming the Output Voltage
        2. Maximum Output Current
        3. Inductor Selection
        4. Output Capacitor Selection
        5. Input Capacitor Selection
      3. 8.2.3 Application Curves
      4. 8.2.4 Typical Application – 3.3-V Output Boost Converter with Automatic Buck or Boost Function
        1. Design Requirements
        2. Detailed Design Procedure
          1. Programming the Voltage and Current
        3. Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

The Configuration of VCHG Pin, ICHG Pin, and OSEL Pin

The TPS61094 supports sixteen internal setting options for charging termination voltage (VCHG), charging current (ICHG), and output voltage (OSEL) by connecting a resistor between the VCHG, ICHG, or OSEL pin and ground.

During start-up, when output voltage reaches close to input voltage, the device starts to detect the configuration conditions of the VCHG, ICHG, and OSEL pins (in that order). The TPS61094 checks the VCHG, ICHG, and OSEL pins by lowering setting options to higher setting options until the user finds the setting configuration by a 10-μs clock. After detecting the configuration, the TPS61094 latches the charging current in Buck mode, the charging termination voltage in Buck mode, and the setting output regulation voltage in Boost mode. To save detection time, TI suggests shorting the VCHG and ICHG pins to ground when Buck mode is not used.

The TPS61094 does not detect the VCHG, ICHG, and OSEL pins during operation, so changing the resistor during operation does not change the VCHG, ICHG, and OSEL settings. Toggling the EN pin during operation is one way to refresh the VCHG, ICHG, and OSEL settings.

For proper operation, TI suggests that the setting resistance accuracy must be 1% and the parasitic capacity of the VCHG, ICHG, and OSEL pins should be less than 10 pF.