SNVSC77B December   2024  – April 2025 LM5125-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Device Configuration (CFG0-pin, CFG1-pin, CFG2-pin)
      2. 6.3.2  Device and Phase Enable/Disable (UVLO/EN, EN2)
      3. 6.3.3  Switching Frequency and Synchronization (SYNCIN)
      4. 6.3.4  Dual Random Spread Spectrum (DRSS)
      5. 6.3.5  Operation Modes (BYPASS, DEM, FPWM)
      6. 6.3.6  VCC Regulator, BIAS (BIAS-pin, VCC-pin)
      7. 6.3.7  Soft Start (SS-pin)
      8. 6.3.8  VOUT Programming (VOUT, ATRK, DTRK)
      9. 6.3.9  Protections
        1. 6.3.9.1 VOUT Overvoltage Protection (OVP)
        2. 6.3.9.2 Thermal Shutdown (TSD)
      10. 6.3.10 Power-Good Indicator (PGOOD-pin)
      11. 6.3.11 Slope Compensation (CSP1, CSP2, CSN1, CSN2)
      12. 6.3.12 Current Sense Setting and Switch Peak Current Limit (CSP1, CSP2, CSN1, CSN2)
      13. 6.3.13 Input Current Limit and Monitoring (ILIM, IMON, DLY)
      14. 6.3.14 Maximum Duty Cycle and Minimum Controllable On-time Limits
      15. 6.3.15 Signal Deglitch Overview
      16. 6.3.16 MOSFET Drivers, Integrated Boot Diode, and Hiccup Mode Fault Protection (LOx, HOx, HBx-pin)
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown State
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Feedback Compensation
      2. 7.1.2 Non-synchronous Application
    2. 7.2 Typical Application
      1. 7.2.1 Application
      2. 7.2.2 Design Requirements
      3. 7.2.3 Detailed Design Procedure
        1. 7.2.3.1  Determine the Total Phase Number
        2. 7.2.3.2  Determining the Duty Cycle
        3. 7.2.3.3  Timing Resistor RT
        4. 7.2.3.4  Inductor Selection Lm
        5. 7.2.3.5  Current Sense Resistor Rcs
        6. 7.2.3.6  Current Sense Filter RCSFP, RCSFN, CCS
        7. 7.2.3.7  Low-Side Power Switch QL
        8. 7.2.3.8  High-Side Power Switch QH
        9. 7.2.3.9  Snubber Components
        10. 7.2.3.10 Vout Programming
        11. 7.2.3.11 Input Current Limit (ILIM/IMON)
        12. 7.2.3.12 UVLO Divider
        13. 7.2.3.13 Soft Start
        14. 7.2.3.14 CFG Settings
        15. 7.2.3.15 Output Capacitor Cout
        16. 7.2.3.16 Input Capacitor Cin
        17. 7.2.3.17 Bootstrap Capacitor
        18. 7.2.3.18 VCC Capacitor CVCC
        19. 7.2.3.19 BIAS Capacitor
        20. 7.2.3.20 VOUT Capacitor
        21. 7.2.3.21 Loop Compensation
      4. 7.2.4 Performance Data and Results
        1. 7.2.4.1 Efficiency
        2. 7.2.4.2 Steady State Waveforms
        3. 7.2.4.3 Step Load Response
        4. 7.2.4.4 AC Loop Response Curve
        5. 7.2.4.5 Thermal Performance
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.3 Power Supply Recommendations

The LM5125-Q1 is designed to operate over a wide input voltage range. It is necessary that the characteristics of the input supply is compatible with the Absolute Maximum Ratings and Recommended Operating Conditions. It is also necessary that the input supply is capable of delivering the required input current to the fully loaded regulator. Use Equation 78 to estimate the average input current.

Equation 78. I I =   P O V I   η

where η is the efficiency.

One way to get a value for the efficiency is the data from the efficiency graphs in the Efficiency section in the worst case operation mode. For most applications, the boost operation is the region of highest input current.

If the device is connected to an input supply through long wires or PCB traces with a large impedance, take special care to achieve stable performance. The parasitic inductance and resistance of the input cables have an adverse effect on converter operation. The parasitic inductance in combination with the low-ESR ceramic input capacitors form an under-damped resonant circuit. This circuit causes overvoltage transients at VI each time the input supply is cycled ON and OFF. The parasitic resistance causes the input voltage to dip during a load transient. One way to solve such issues is to reduce the distance from the input supply to the regulator and use an aluminum or tantalum input capacitor in parallel with the ceramics. The moderate ESR of the electrolytic capacitors helps to damp the input resonant circuit and reduce any voltage overshoots. An EMI input filter is often used in front of the controller power stage. Design the EMI input filter carefully to avoid instability as well as some of the previously mentioned affects.