SLVS728D January   2007  – October 2019 TPS2412 , TPS2413

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Diagram
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin 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 Dissipation Ratings
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Definitions
      2. 8.3.2 TPS2412 vs TPS2413 – MOSFET Control Methods
      3. 8.3.3 N+1 Power Supply – Typical Connection
      4. 8.3.4 Input ORing – Typical Connection
      5. 8.3.5 System Design and Behavior With Transients
      6. 8.3.6 TPS2412 Regulation-Loop Stability
      7. 8.3.7 MOSFET Selection and R(RSET)
      8. 8.3.8 Gate Drive, Charge Pump and C(BYP)
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Recommended Operating Range
    2. 10.2 VDD, BYP, and Powering Options
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

9.2 Typical Application

Applications with the TPS2412/13 are not limited to ORing of identical sections. The TPS2412/13 and external MOSFET form a general purpose function block. Figure 11 shows a circuit with ORing between a discrete diode and a TPS2412/MOSFET section. This circuit can be used to combine two different voltages in cases where the output is regulated, and the additional voltage drop in the Input 1 path is not a concern. An example is ORing of an AC adapter on Input 1 with a lower voltage on Input 2.

TPS2412 TPS2413 oring_cir_lvs728.gifFigure 11. ORing Circuit

The TPS2412 may be a better choice in applications where inputs may be removed, causing an open-circuit input. If the MOSFET was ON when the input is removed, VAC will be virtually zero. If the reverse turnoff threshold is programmed negative, the TPS2412/13 will not pull GATE low. A system interruption could then be created if a short is applied to the floating input. For example, if an AC adapter is first connected to the unit, and then connected to the AC mains, the adapter's output capacitors will look like a momentary short to the unit. A TPS2412 with RSET open will turn the MOSFET OFF when the input goes open circuit.