TIDUFE2 October   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Fault Detection and Protection
      2. 2.2.2 Theory of Operation - Parallel LDOs Using Op Amps
      3. 2.2.3 Theory of Operation - Parallel LDOs Using Ballast Resistors
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS7B7702-Q1, Automotive, Dual-Channel Antenna Low Dropout (LDO) Regulator With Current Sense
      2. 2.3.2 OPAx388 Automotive, Precision, Zero-Drift, Zero-Crossover, True Rail-to-Rail, Input/Output Operational Amplifiers
      3. 2.3.3 LMV321A-Q1 Automotive Low-Voltage Rail-to-Rail Output Operational Amplifier
  9. 3Hardware, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results - Parallel LDOs Using Op Amps
      1. 3.3.1 Short to Battery
      2. 3.3.2 Load Transient Response
      3. 3.3.3 Current Limit
      4. 3.3.4 Start-Up
      5. 3.3.5 Shutdown
      6. 3.3.6 Line Transient
      7. 3.3.7 PSRR
      8. 3.3.8 Thermal Performance
      9. 3.3.9 Thermal Limit Protection
    4. 3.4 Test Results - Parallel LDOs Using Ballast Resistors
      1. 3.4.1 Short to Battery
      2. 3.4.2 Load Transient Response
      3. 3.4.3 Current Limit
      4. 3.4.4 Start-Up
      5. 3.4.5 Line Transient
      6. 3.4.6 Thermal Performance
      7. 3.4.7 Thermal Limit Protection
    5. 3.5 Comparison of Results Between Parallel LDO Techniques
      1. 3.5.1 VLOAD vs ILOAD
      2. 3.5.2 PSRR
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Layout Prints
    2. 4.2 Tools
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

3.3.4 Start-Up

TIDA-050096 Start-Up Into a 600mA Load
VIN = 12V, IOUT = 600mA, 4 x LDO channels
Figure 3-21 Start-Up Into a 600mA Load
TIDA-050096 Start-Up Into a 415mA Load
VIN = 12V, IOUT = 415mA, 3 x LDO channels
Figure 3-23 Start-Up Into a 415mA Load
TIDA-050096 Start-Up Into a 275mA Load
VIN = 12V, IOUT = 275mA, VERR = VERR1, 2 x LDO channels
Figure 3-25 Start-Up Into a 275mA Load
TIDA-050096 Start-Up Into a 1.2A Load
VIN = 12V, IOUT = 1.2A, 4 x LDO channels
Figure 3-22 Start-Up Into a 1.2A Load
TIDA-050096 Start-Up Into a 870mA Load
VIN = 12V, IOUT = 870mA, 3 x LDO channels
Figure 3-24 Start-Up Into a 870mA Load
TIDA-050096 Start-Up Into a 580mA Load
VIN = 12V, IOUT = 580mA, VERR = VERR1, 2 x LDO channels
Figure 3-26 Start-Up Into a 580mA Load