SNVSCU7 July   2025 LM65460-Q1

ADVMIX  

  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
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Descriptions
      1. 7.3.1  Output Voltage Selection
      2. 7.3.2  EN Pin and Use as VIN UVLO
      3. 7.3.3  Mode Selection
        1. 7.3.3.1 MODE/SYNC Pin Uses for Synchronization
        2. 7.3.3.2 Clock Locking
      4. 7.3.4  Adjustable Switching Frequency
      5. 7.3.5  Dual Phase Operation
      6. 7.3.6  Dual Randrom Spread Spectrum (DRSS)
      7. 7.3.7  Internal LDO, VCC UVLO, and BIAS Input
      8. 7.3.8  Bootstrap Voltage (BST Pin)
      9. 7.3.9  Soft Start and Recovery From Dropout
      10. 7.3.10 Safety Features
        1. 7.3.10.1 Power-Good Monitor
        2. 7.3.10.2 Overcurrent and Short-Circuit Protection
        3. 7.3.10.3 Hiccup
        4. 7.3.10.4 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
        1. 7.4.2.1 Peak Current Mode Operation
        2. 7.4.2.2 Auto Mode Operation
          1. 7.4.2.2.1 Diode Emulation
        3. 7.4.2.3 FPWM Mode Operation
        4. 7.4.2.4 Dropout
        5. 7.4.2.5 Recovery from Dropout
  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 Choosing the Switching Frequency
        3. 8.2.2.3 FB for Adjustable or Fixed Output Voltage Mode
        4. 8.2.2.4 Inductor Selection
        5. 8.2.2.5 Output Capacitor Selection
        6. 8.2.2.6 Input Capacitor Selection
        7. 8.2.2.7 CBOOT
        8. 8.2.2.8 External UVLO
        9. 8.2.2.9 Maximum Ambient Temperature
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Ground and Thermal Considerations
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Tape and Reel Information

8.2.3 Application Curves

The applications curves were measured using the LM65460EVM. Unless otherwise specified the following condition apply: TA = 25ºC, VIN = 12V, 2100kHz.

LM65460-Q1 Efficiency
VOUT = 5V 2100kHz, Auto Mode
Figure 8-4 Efficiency
LM65460-Q1 Typical Switching Waveform in PWM
IOUT = 6A VIN = 12V VOUT = 5V
Figure 8-6 Typical Switching Waveform in PWM
LM65460-Q1 Load Transient (FPWM)
IOUT = 0A to 6A (1A/μs) VIN = 12V FPWM Mode VOUT = 5V
Figure 8-8 Load Transient (FPWM)
LM65460-Q1 Line and Load Regulation
VOUT = 5V 2100kHz, Auto Mode
Figure 8-5 Line and Load Regulation
LM65460-Q1 Typical Switching Waveform in PFM
IOUT = 50mA VIN = 12V VOUT = 5V
Figure 8-7 Typical Switching Waveform in PFM
LM65460-Q1 Load Transient (AUTO)
IOUT = 0A to 6A (1A/μs) VIN = 12V Auto Mode VOUT = 5V
Figure 8-9 Load Transient (AUTO)
LM65460-Q1 Start-Up
IOUT = 50mA VIN = 12V Auto Mode VOUT = 5V
Figure 8-10 Start-Up
LM65460-Q1 Short Circuit
IOUT = Short Circuit VIN = 12V VOUT = 5V
Figure 8-12 Short Circuit
LM65460-Q1 Start-Up
IOUT = 6A VIN = 12V Auto Mode VOUT = 5V
Figure 8-11 Start-Up
LM65460-Q1 Thermal Image
IOUT = 6A 2100kHz VIN = 12V VOUT = 5V
LM65460EVM
Figure 8-13 Thermal Image
Table 8-3 Typical System Specifications
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Isupply Input supply current Vin = 12V, Vout = 5V, Iout = 0A, LM65460-Q1, 2.1MHz 8.7 µA
Vin = 24V, Vout = 5V, Iout = 0A, LM65460-Q1, 2.1MHz 5.6 µA
Output ripple Vout = 5V Vin = 12V, Iout = 6A, FPWM 11.8 mVpp
Vout = 5V Vin = 12V, Iout = 0A, AUTO 23.8 mVpp
Vout = 3.3V Vin = 12V, Iout = 6A, FPWM 10.7 mVpp
Vout = 3.3V Vin = 12V, Iout = 0A, AUTO 17 mVpp
η Peak efficiency Vin = 12V, Vout = 5V, Iout = 4A , LM65460-Q1, 2.1MHz 94 %
Vin = 12V, Vout = 5V, Iout = 3A , LM65460-Q1, 400kHz 96.5 %
Vin = 12V, Vout = 3.3V, Iout = 4A , LM65460-Q1, 2.1MHz 92 %
Vin = 12V, Vout = 3.3V, Iout = 3A, LM65460-Q1, 400kHz 95.6 %
Loop response Crossover frequency Vin= = 12V, Vout = 3.3V, Cout = 22µF + 10µF, L = 0.68uH 220 kHz
Gain margin Vin= = 12V, Vout = 3.3V, Cout = 22µF + 10µF, L = 0.68uH –18 dB
Phase margin Vin= = 12V, Vout = 3.3V, Cout = 22µF + 10µF, L = 0.68uH 51 °
Load transient 10% to 90% load transient output voltage ripple Vin = 12V, Vout = 5V, 2.1MHz, AUTO, 10% to 90% load 368 mVpp
Vin = 12V, Vout = 5V, 2.1MHz, FPWM, 10% to 90% load 338 mVpp
Vin = 12V, Vout = 3.3V, 2.1MHz, AUTO, 10% to 90% load 212 mVpp
Vin = 12V, Vout = 3.3V, 2.1MHz, FPWM, 10% to 90% load 214 mVpp