SLVSFL4 June   2020 TPS2124

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
  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 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input Settling Time and Output Soft Start Control (SS)
        1. 8.3.1.1 Slew Rate vs. CSS Capacitor
      2. 8.3.2 Active Current Limiting (ILM)
      3. 8.3.3 Short-Circuit Protection
      4. 8.3.4 Thermal Protection (TSD)
      5. 8.3.5 Over-voltage Protection (OVx)
      6. 8.3.6 Fast Reverse Current Blocking (RCB)
      7. 8.3.7 Input Voltage Comparator (VCOMP)
    4. 8.4 TPS2124 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Manual Switchover Schematic
      2. 9.2.2 Design Requirements
      3. 9.2.3 Detailed Design Description
      4. 9.2.4 Design Procedure
        1. 9.2.4.1 Selecting OVx Resistors
        2. 9.2.4.2 Selecting Soft-Start Capacitor and Current Limit Resistors
      5. 9.2.5 Application Curves
    3. 9.3 Highest Voltage Operation (VCOMP)
      1. 9.3.1 Application Schematic
      2. 9.3.2 Design Requirements
      3. 9.3.3 Detailed Design Description
      4. 9.3.4 Detailed Design Procedure
      5. 9.3.5 Application Curves
    4. 9.4 Reverse Polarity Protection with TPS2124
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

8.4 TPS2124 Device Functional Modes

Table 2 shows the TPS2124 functional behavior.

Table 2. TPS2124 Output Source Selection Table

DEVICE INPUTS DEVICE OUTPUTS MODE OF OPERATION
IN1 ≤ UV OR
OV1 ≥ VREF OR
SEL ≥VREF		 IN2 ≤ UV OR
OV2 ≥ VREF 		PR1 ≥ VREF VCOMP OUT ST MODE
0 0 0 IN2 < IN1 IN1 H VCOMP
0 0 0 IN2 ≥ IN1 IN2 L VCOMP
0 0 1 X IN1 H VREF
0 1 X X IN1 H Invalid Input
1 0 X X IN2 L SEL / Invalid Input
1 1 X X Hi-Z H Invalid Inputs

A summary of the operation of the TPS2124 device can be found below:

  • If only one input voltage is valid (above UV and below OV) then that input will power the output.
  • If both inputs are not valid, then the output is Hi-Z.
  • ST is pulled high when the output is Hi-Z or IN1. It is pulled low when IN2 is powering the output.
  • If both inputs are valid and PR1 is pulled high (higher than VREF, 1.06-V typical), then IN1 is used.
  • If both inputs are valid and PR1 is pulled low, then the highest voltage input is used.