SBVS314B March   2018  – October 2018 TPS7A10

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Dropout vs IOUT and Temperature, YKA Package
      2.      Typical Application Circuit
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Excellent Transient Response
      2. 7.3.2 Global Undervoltage Lockout (UVLO)
      3. 7.3.3 Active Discharge
      4. 7.3.4 Enable
      5. 7.3.5 Sequencing Requirement
      6. 7.3.6 Internal Foldback Current Limit
      7. 7.3.7 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Mode
      2. 7.4.2 Dropout Mode
      3. 7.4.3 Disable Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Recommended Capacitor Types
      2. 8.1.2 Input and Output Capacitor Requirements
      3. 8.1.3 Load Transient Response
      4. 8.1.4 Dropout Voltage
      5. 8.1.5 Behavior During Transition From Dropout Into Regulation
      6. 8.1.6 Undervoltage Lockout Circuit Operation
      7. 8.1.7 Power Dissipation (PD)
        1. 8.1.7.1 Estimating Junction Temperature
        2. 8.1.7.2 Recommended Area for Continuous Operation
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Current
        2. 8.2.2.2 Thermal Dissipation
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Evaluation Module
        2. 11.1.1.2 Spice Model
      2. 11.1.2 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

8.1.6 Undervoltage Lockout Circuit Operation

The VIN UVLO circuit makes sure that the device remains disabled before the input supply reaches the minimum operational voltage range. The VIN UVLO circuit also makes sure that the device shuts down when the input supply collapses. Similarly, the VBIAS UVLO circuit makes sure that the device stays disabled before the bias supply reaches the minimum operational voltage range. The VBIAS UVLO circuit also makes sure that the device shuts down when the bias supply collapses.

Figure 40 depicts the UVLO circuit response to various input or bias voltage events. This figure can be separated into the following parts:

  • Region A: The device does not start until the input or bias voltage reaches the UVLO rising threshold.
  • Region B: Normal operation, regulating device
  • Region C: Brownout event above the UVLO falling threshold (UVLO rising threshold – UVLO hysteresis). The output may fall out of regulation, but the device is still enabled.
  • Region D: Normal operation, regulating device
  • Region E: Brownout event below the UVLO falling threshold. The device is disabled in most cases, and the output falls as a result of the load and active discharge circuit. The device is re-enabled when the UVLO rising threshold is reached, and a normal start-up follows.
  • Region F: Normal operation followed by the input or bias falling to the UVLO falling threshold
  • Region G: The device is disabled as the input or bias voltages fall below the UVLO falling threshold to 0 V. The output falls as a result of the load and active discharge circuit.
TPS7A10 Typical-Vin-Vbias-UVLO.gifFigure 40. Typical VIN or VBIAS UVLO Circuit Operation