SLUSAY8G June   2012  – November 2025 TPS53318 , TPS53319

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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. 6.7 TPS53319 Typical Characteristics
    8. 6.8 TPS53318 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  5-V LDO and VREG Start-Up
      2. 7.3.2  Adaptive On-Time D-CAP™ Integrated Circuit Control and Frequency Selection
      3. 7.3.3  Ramp Signal
      4. 7.3.4  Adaptive Zero Crossing
      5. 7.3.5  Output Discharge Control
      6. 7.3.6  Power Good
      7. 7.3.7  Current Sense, Overcurrent, and Short-Circuit Protection
      8. 7.3.8  Overvoltage and Undervoltage Protection
      9. 7.3.9  Redundant Overvoltage Protection (OVP)
      10. 7.3.10 UVLO Protection
      11. 7.3.11 Thermal Shutdown
      12. 7.3.12 Small Signal Model
      13. 7.3.13 External Component Selection Using All Ceramic Output Capacitors
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable, Soft Start, and Mode Selection
      2. 7.4.2 Auto-Skip Eco-mode Light Load Operation
      3. 7.4.3 Forced Continuous Conduction Mode
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Application Using Bulk Output Capacitors, Redundant Overvoltage Protection Function (OVP) Disabled
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Step One: Select Operation Mode and Soft-Start Time
          2. 8.2.1.2.2 Step Two: Select Switching Frequency
          3. 8.2.1.2.3 Step Three: Choose the Inductor
          4. 8.2.1.2.4 Step Four: Choose the Output Capacitor or Capacitors
          5. 8.2.1.2.5 Step Five: Determine the Value of R1 and R2
          6. 8.2.1.2.6 Step Six: Choose the Overcurrent Setting Resistor
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Application Using Ceramic Output Capacitors, Redundant Overvoltage Protection Function (OVP) Enabled
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 External Component Selection Using All Ceramic Output Capacitors
          2. 8.2.2.2.2 Redundant Overvoltage Protection
        3. 8.2.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2.1.1 Design Requirements

This design uses the parameters listed in Table 8-1.

Table 8-1 Design Specifications
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
INPUT CHARACTERISTICS
VINVoltage range51218V
IMAXMaximum input currentVIN = 5 V, IOUT = 8 A2.5A
No load input currentVIN = 12 V, IOUT = 0 A with auto-skip mode1mA
OUTPUT CHARACTERISTICS
VOUTOutput voltage1.2V
Output voltage regulationLine regulation, 5 V ≤ VIN ≤ 14 V with FCCM0.2%
Load regulation, VIN = 12 V, 0 A ≤ IOUT ≤ 8 A with FCCM0.5%
VRIPPLEOutput voltage rippleVIN = 12 V, IOUT = 8 A with FCCM10mVPP
ILOADOutput load current08A
IOVEROutput overcurrent11
tSSSoft-start time1ms
SYSTEMS CHARACTERISTICS
fSWSwitching frequency5001000kHz
ηPeak efficiencyVIN = 12 V, VOUT = 1.2 V, IOUT = 4 A91%
Full load efficiencyVIN = 12 V, VOUT = 1.2 V, IOUT = 8 A91.5%
TAOperating temperature25°C