SLVSCL5A June   2014  – November 2020 TPS2559

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and 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 Timing Requirements
    7. 7.7 Timing Diagrams
    8. 7.8 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 Thermal Sense
      2. 8.3.2 Overcurrent Protection
      3. 8.3.3 FAULT Response
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation with VIN Undervoltage Lockout (UVLO) Control
      2. 8.4.2 Operation with EN Control
  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
        1. 9.2.2.1 Step-by-Step Design Procedure
        2. 9.2.2.2 Input and Output Capacitance
        3. 9.2.2.3 Programming the Current-Limit Threshold
        4. 9.2.2.4 Design Above a Minimum Current Limit
        5. 9.2.2.5 Design Below a Maximum Current Limit
        6. 9.2.2.6 Accounting for Resistor Tolerance
        7. 9.2.2.7 Power Dissipation and Junction Temperature
        8. 9.2.2.8 Auto-Retry
        9. 9.2.2.9 Two-Level Current-Limit
      3. 9.2.3 Application Curves
  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

Package Options

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

9.2.1 Design Requirements

Table 9-1 lists the input parameters for this design example.

Table 9-1 Design Requirements
DESIGN PARAMETERS EXAMPLE VALUE
Input operation voltage 5 V
Rating current 3 A or 4.5 A
Minimum current limit 3 A
Maximum current limit 5 A

When choosing a power switch, there are several general steps:

  1. Determine what is the power rail, 3.3 V or 5 V, and then choose the operation range of the power switch that can cover the power rail voltage range.
  2. Determine what is the normal operation current. For example, the maximum allowable current drawn by portable equipment for a USB 2.0 port is 500 mA, so the normal operation current is 500 mA and the minimum current limit of power switch must exceed 500 mA to avoid false trigger during normal operation.
  3. Determine what is the maximum allowable current provided by up-stream power, and then decide the maximum current limit of the power switch that must lower it to ensure the power switch can protect the up-stream power when an overload is encountered at the output of the power switch.
Note:

Choosing power switch with tighter current limit tolerance can loosen the up-stream power-supply design.