SLVSFH6C January   2021  – December 2021 TPS61094

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1 The Configuration of VCHG Pin, ICHG Pin, and OSEL Pin
        1. 7.1.1.1 OSEL: Output Voltage Selection
        2. 7.1.1.2 VCHG: Charging Termination Voltage Selection
        3. 7.1.1.3 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. 7.4.5.1 Three States (Boost_on, Buck_on, and Supplement) Transition
        2. 7.4.5.2 Boost, Bypass, and Pass-Through
        3. 7.4.5.3 PWM, PFM, and Snooze Modes in Boost Operation
          1. 7.4.5.3.1 PWM Mode
          2. 7.4.5.3.2 PFM Mode
          3. 7.4.5.3.3 Snooze Mode
  8. 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. 8.2.2.1 Programming the Output Voltage
        2. 8.2.2.2 Maximum Output Current
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Output Capacitor Selection
        5. 8.2.2.5 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. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
          1. 8.2.4.2.1 Programming the Voltage and Current
        3. 8.2.4.3 Application Curves
  9. 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

7.4.5.1 Three States (Boost_on, Buck_on, and Supplement) Transition

In Auto buck or Boost mode operation, there are three states: boost_on, buck_on, and supplement, as shown in Figure 7-2 to Figure 7-4. The boost_on state occurs when the bypass switch is turned off and the TPS61094 works in Boost mode to regulate output voltage to the OSEL setting. The buck_on state occurs when the bypass switch is turned on and the TPS61094 works in Buck mode, charging the SUP pin by an input source according to the charging current and termination voltage settings at the ICHG and VCHG pin in this situation, which is similar to the Forced buck mode operation. Supplement mode is the intermediate state when the TPS61094 transfers between boost_on and buck_on opetation. In Supplement mode, Boost mode is active and the bypass MOSFET operates as an LDO, the VIN and SUP power source supply the output load together.

GUID-20200831-CA0I-KSHZ-8M8H-KGSG2GMWNSQX-low.gif Figure 7-2 Typical Boost_on State Circuit
GUID-20200831-CA0I-F64P-XK9C-XSQWV60MLMQM-low.gif Figure 7-3 Typical Buck_on State Circuit
GUID-20200831-CA0I-QTQZ-GV4S-RS1L5S1KFDCT-low.gif Figure 7-4 Typical Supplement State Circuit

The TPS61094 can automatically transfer in these three states based on input voltage and output voltage, as shown in Figure 7-5.

GUID-20200831-CA0I-HFQJ-6MMX-7GZ4PJHVTM6R-low.gif Figure 7-5 Three States(Boost_on, Buck_on, and Supplement) Transition

Path 1: The TPS61094 works at buck_on state first. There is a heavy load transient in the output load and the input source cannot hold it, which makes the output voltage lower than the output target voltage (OSEL pin setting). The TPS61094 transfers from buck_on to supplement state. Input and SUP power source can supply the heavy load together.

Path 2: In supplement state, if the input voltage is higher than the output target voltage + 100 mV and the output voltage is higher than the output target voltage, meaning the input power source can support the output load, the TPS61094 transfers from supplement to buck_on state.

Path 3: In supplement operation, if the output load is light, the output voltage is higher than the output target voltage. The TPS61094 transfers from supplement to boost_on state. The TPS61094 has approximately 60-nA IQ in Boost mode, which can help the system has higher efficiency at light load.

Path 4: In boost_on state, when the input power source is higher than the output target voltage + 100 mV, the TPS61094 transfers from boost_on to supplement state.

Path 5: A quick way to transfer from buck_on to boost_on state. At buck_on state, if the load is light and input voltage is lower than the output target voltage + 100 mV, the TPS61094 can enter boost_on state.

In boost_on mode, when the SUP pin voltage is higher than output target voltage, the TPS61094 enters Pass-through mode. The TPS61094 stops switching and fully turns on high-side MOSFET. The devices stays in boost_on (Pass-through mode) until the SUP pin voltage is lower than the output target voltage.