SLVSBD0B November   2012  – June 2020 TPS2553-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application as USB Power Switch
  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 Overcurrent Conditions
      2. 8.3.2 Reverse-Voltage Protection
      3. 8.3.3 FAULT Response
      4. 8.3.4 Undervoltage Lockout (UVLO)
      5. 8.3.5 Enable (EN)
      6. 8.3.6 Thermal Sense
    4. 8.4 Device Functional Modes
    5. 8.5 Programming
      1. 8.5.1 Programming the Current-Limit Threshold
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Constant-Current and Impact on Output Voltage
      2. 9.1.2 Accounting for Resistor Tolerance
      3. 9.1.3 Input and Output Capacitance
    2. 9.2 Typical Applications
      1. 9.2.1 Application 1: Designing Above a Minimum Current-Limit
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Application 2: Designing Below a Maximum Current-Limit
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
      3. 9.2.3 Application 3: Auto-Retry Functionality
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
      4. 9.2.4 Application 4: Two-Level Current-Limit Circuit
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
      5. 9.2.5 Application 5: Typical Application as USB Power Switch
        1. 9.2.5.1 Design Requirements
        2. 9.2.5.2 Detailed Design Procedure
          1. 9.2.5.2.1 Universal Serial Bus (USB) Power-Distribution Requirements
  10. 10Power Supply Recommendations
    1. 10.1 USB Self-Powered (SPH) and Bus-Powered (BPH) Hubs
    2. 10.2 USB Low-Power Bus-Powered and High-Power Bus-Powered Functions
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Power Dissipation and Junction Temperature
  12. 12Device and Documentation Support
    1. 12.1 Device Support
    2. 12.2 Support Resource
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

パッケージ・オプション

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メカニカル・データ（パッケージ｜ピン）
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発注情報

9.1.2 Accounting for Resistor Tolerance

The tolerance of the resistor selected for RILIM will impact the current-limit threshold tolerance, which is important in many applications. The analysis in the following examples focuses only on the TPS2553-Q1 device performance and assumed an exact resistor value. However, resistors sold in quantity are not exact and are bounded by an upper and lower tolerance centered around a nominal resistance. The additional RILIM resistance tolerance directly affects the current-limit threshold accuracy at a system level. Table 1 shows a process that accounts for worst-case resistor tolerance assuming 1% resistor values. Step one follows the selection process outlined in the following application examples. Step two determines the upper and lower resistance bounds of the selected resistor. Step three uses the upper and lower resistor bounds in the IOS equations to calculate the threshold limits. It is important to use tighter tolerance resistors, for example, 0.5% or 0.1%, when precision current-limiting is desired.

Table 1. Common RILIM Resistor Selections

DESIRED NOMINAL CURRENT-LIMIT (mA) IDEAL RESISTOR (kΩ) CLOSEST
1%
RESISTOR
(kΩ)		 RESISTOR TOLERANCE ACTUAL LIMITS
1% LOW (kΩ) 1% HIGH (kΩ) IOS MIN (mA) IOS NOM (mA) IOS MAX (mA)
75 SHORT ILIM to IN 50 75 100
120 226.1 226 223.7 228.3 101.3 120 142.1
200 134 133 131.7 134.3 173.7 201.5 233.9
300 88.5 88.7 87.8 89.6 262.1 299.4 342.3
400 65.9 66.5 65.8 67.2 351.2 396.7 448.7
500 52.5 52.3 51.8 52.8 448.3 501.6 562.4
600 43.5 43.2 42.8 43.6 544.3 604.6 673.1
700 37.2 37.4 37 37.8 630.2 696 770.8
800 32.4 32.4 32.1 32.7 729.1 800.8 882.1
900 28.7 28.7 28.4 29 824.7 901.5 988.7
1000 25.8 26.1 25.8 26.4 908.3 989.1 1081
1100 23.4 23.2 23 23.4 1023.7 1109.7 1207.5
1200 21.4 21.5 21.3 21.7 1106 1195.4 1297.1
1300 19.7 19.6 19.4 19.8 1215.1 1308.5 1414.9
1400 18.3 18.2 18 18.4 1310.1 1406.7 1517
1500 17 16.9 16.7 17.1 1412.5 1512.4 1626.4
1600 16 15.8 15.6 16 1512.5 1615.2 1732.7
1700 15 15 14.9 15.2 1594.5 1699.3 1819.4