SNVSBU4E June   2022  – August 2024 LM5177

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 Handling Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Gate Driver Rise Time and Fall Time
    2. 6.2 Gate Driver Dead (Transition) Time
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Power-On Reset (POR System)
      2. 7.3.2  Buck-Boost Control Scheme
        1. 7.3.2.1 Boost Mode
        2. 7.3.2.2 Buck Mode
        3. 7.3.2.3 Buck-Boost Mode
      3. 7.3.3  Power Save Mode
      4. 7.3.4  Supply Voltage Selection – VMAX Switch
      5. 7.3.5  Enable and Undervoltage Lockout
      6. 7.3.6  Oscillator Frequency Selection
      7. 7.3.7  Frequency Synchronization
      8. 7.3.8  Voltage Regulation Loop
      9. 7.3.9  Output Voltage Tracking
      10. 7.3.10 Slope Compensation
      11. 7.3.11 Configurable Soft Start
      12. 7.3.12 Peak Current Sensor
      13. 7.3.13 Current Monitoring and Current Limit Control Loop
      14. 7.3.14 Short Circuit - Hiccup Protection
      15. 7.3.15 nFLT Pin and Protections
      16. 7.3.16 Device Configuration Pin
      17. 7.3.17 Dual Random Spread Spectrum – DRSS
      18. 7.3.18 Gate Driver
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Custom Design with WEBENCH Tools
        2. 8.2.2.2  Frequency
        3. 8.2.2.3  Feedback Divider
        4. 8.2.2.4  Inductor and Current Sense Resistor Selection
        5. 8.2.2.5  Slope Compensation
        6. 8.2.2.6  Output Capacitor
        7. 8.2.2.7  Input Capacitor
        8. 8.2.2.8  UVLO Divider
        9. 8.2.2.9  Soft-Start Capacitor
        10. 8.2.2.10 MOSFETs QH1 and QL1
        11. 8.2.2.11 MOSFETs QH2 and QL2
        12. 8.2.2.12 Frequency Compensation
        13. 8.2.2.13 External Component Selection
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
      1. 8.3.1 Bi-Directional Power Backup
      2. 8.3.2 Parallel (Multiphase) Operation
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Power Stage Layout
      2. 10.1.2 Gate Driver Layout
      3. 10.1.3 Controller Layout
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
        1. 11.1.2.1 Custom Design with WEBENCH Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

Package Options

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

5.6 Typical Characteristics

The following conditions apply (unless otherwise noted): TJ = 25°C; V(VCC) = 5 V

LM5177 Switching Frequency Versus RT ResistanceFigure 5-1 Switching Frequency Versus RT Resistance
LM5177 VIN LDO - VCC Voltage versus VCC Load CurrentFigure 5-3 VIN LDO - VCC Voltage versus VCC Load Current
LM5177 BIAS LDO - VCC Voltage versus VCC Load CurrentFigure 5-5 BIAS LDO - VCC Voltage versus VCC Load Current
LM5177 FB Pin Reference Voltage versus TemperatureFigure 5-7 FB Pin Reference Voltage versus Temperature
LM5177 CSA Input Current versus Temperature Figure 5-9 CSA Input Current versus Temperature
LM5177 Minimum Controllable On-time versus Switching FrequencyFigure 5-11 Minimum Controllable On-time versus Switching Frequency
LM5177 UVLO Threshold Voltage versus Temperature Figure 5-13 UVLO Threshold Voltage versus Temperature
LM5177 Shutdown Current into VIN versus Temperature VEN/UVLO = 0 V ,V(VIN) = 12 V,V(BIAS) = 0 VFigure 5-15 Shutdown Current into VIN versus Temperature
VEN/UVLO = 0 V ,V(VIN) = 12 V,V(BIAS) = 0 V
LM5177 Shutdown Current into VIN versus Temperature VEN/UVLO = 0 V ,V(BIAS) = 12 V, V(VIN) = 3.5 VFigure 5-17 Shutdown Current into VIN versus Temperature
VEN/UVLO = 0 V ,V(BIAS) = 12 V, V(VIN) = 3.5 V
LM5177 Quiescent Current into BIAS versus Pin Voltage VEN/UVLO = 3.3 V, V(VIN) = 12 VFigure 5-19 Quiescent Current into BIAS versus Pin Voltage
VEN/UVLO = 3.3 V, V(VIN) = 12 V
LM5177 Soft-Start current versus Temperature Figure 5-21 Soft-Start current versus Temperature
LM5177 Switching Frequency Versus Temperature R(RT) = 75 kΩFigure 5-2 Switching Frequency Versus Temperature
R(RT) = 75 kΩ
LM5177 VIN LDO - VCC Voltage versus VIN Voltage I(VCC) = 20 mAFigure 5-4 VIN LDO - VCC Voltage versus VIN Voltage
I(VCC) = 20 mA
LM5177 BIAS LDO - VCC Voltage versus BIAS Voltage I(VCC) = 50 mAFigure 5-6 BIAS LDO - VCC Voltage versus BIAS Voltage
I(VCC) = 50 mA
LM5177 Current Limit Threshold Voltage Versus TemperatureFigure 5-8 Current Limit Threshold Voltage Versus Temperature
LM5177 CSB Input Current versus Temperature Figure 5-10 CSB Input Current versus Temperature
LM5177 Minimum Controllable Off-time versus Switching FrequencyFigure 5-12 Minimum Controllable Off-time versus Switching Frequency
LM5177 Shutdown Current into VIN versus Pin Voltage VEN/UVLO = 0 V ,V(VIN) = 12 V, V(BIAS) = 0 VFigure 5-14 Shutdown Current into VIN versus Pin Voltage
VEN/UVLO = 0 V ,V(VIN) = 12 V, V(BIAS) = 0 V
LM5177 Shutdown Current into BIAS versus Pin Voltage VEN/UVLO = 0 V ,V(VIN) = 12 V, V(VIN) = 3.5 VFigure 5-16 Shutdown Current into BIAS versus Pin Voltage
VEN/UVLO = 0 V ,V(VIN) = 12 V, V(VIN) = 3.5 V
LM5177 Standby Current into VIN versus Temperature VEN/UVLO = 0.8 V, V(VIN) = 12 VFigure 5-18 Standby Current into VIN versus Temperature
VEN/UVLO = 0.8 V, V(VIN) = 12 V
LM5177 Quiescent Current into BIAS versus Temperature VEN/UVLO = 3.3 V, V(VIN) = 12 VFigure 5-20 Quiescent Current into BIAS versus Temperature
VEN/UVLO = 3.3 V, V(VIN) = 12 V
LM5177 Hysteresis Current on EN/UVLO versus Temperature Figure 5-22 Hysteresis Current on EN/UVLO versus Temperature