SLVSBM6B December   2012  – November 2015 TPS22981

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 Dissipation Ratings
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Current Limit
      2. 7.3.2 Current Limit Threshold
      3. 7.3.3 Maximum Current Limit Threshold
      4. 7.3.4 Transition Delays
      5. 7.3.5 Digital Control Signals
      6. 7.3.6 Overcurrent Limit and Short-Circuit Protection
      7. 7.3.7 Reverse Current Protection
      8. 7.3.8 Reverse Current Blocking
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 UVLO and Enable
      2. 7.4.2 FAULTZ Output
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Input Inductive Bounce
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
  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 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • Powered from 3.3 V
  • 4.5-V to 19.8-V High-Voltage Switch
  • 3-V to 3.6-V Switch
  • Adjustable Current Limit
  • Thermal Shutdown
  • Make Before Break Switch
  • High-Voltage Discharge Before Low-Voltage Make
  • Reverse Current Blocking

2 Applications

  • Notebook Computers
  • Desktop Computers
  • Power Management Systems

Typical Application

TPS22981 typapp_lvsbm6.gif

3 Description

The TPS22981 device is a current-limited power mux providing a connection to a peripheral device from either a low-voltage supply (3 V to 3.6 V) or a high-voltage supply (4.5 V to 19.8 V). The desired output is selected by digital control signals.

The high-voltage (VHV) and low-voltage (V3P3) switch current limits are set with external resistance. Once the current limit is reached, the TPS22981 will control the switch to maintain the current at this limit.

When the high-voltage supply is not present, the TPS22981 will maintain the connection to the output from the low-voltage supply. Upon the presence of a high-voltage line and high-voltage enable signal, the high-voltage switch is turned on in conjunction with the low-voltage switch until a reverse current is detected through the low-voltage switch, allowing a seamless transition from low voltage to the high-voltage supply with minimal droop and shoot-through current.

To prevent current backflow during a switch over from a VHV connection to a V3P3 connection, the TPS22981 will break the VHV connection, discharge the output to approximately 3.3 V and then make the V3P3 connection. The output may transition to 0 V when a load is present, before returning to 3.3 V.

The TPS22981 is available in a 4 mm × 4 mm × 1 mm VQFN package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS22981 VQFN (20) 4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.