SNVSCQ8B November   2025  – July 2026 LM654A5-Q1 , LM654B0-Q1

PRODMIX  

  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
  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  Device Configuration
      4. 7.3.4  Mode Selection
        1. 7.3.4.1 MODE/SYNC Pin Uses for Synchronization
        2. 7.3.4.2 Clock Locking
      5. 7.3.5  Adjustable Switching Frequency and Phase Shift
      6. 7.3.6  Dual Random 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
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Example Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Choosing the Switching Frequency
        2. 8.2.2.2 Inductor Selection
        3. 8.2.2.3 Output Capacitors
        4. 8.2.2.4 Input Capacitor Selection
        5. 8.2.2.5 Setting the Output Voltage
        6. 8.2.2.6 Compensation Components
        7. 8.2.2.7 Feed-forward Capacitor (CFF)
        8. 8.2.2.8 Maximum Ambient Temperature
      3. 8.2.3 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 Third-Party Products Disclaimer
    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

8.2 Typical Application

Figure 8-1 to Figure 8-6 show typical application circuits for a wide variety of applications. This device is designed to function over a wide range of external components and system parameters. However, the internal compensation for single phase operation is designed for a certain range of external inductance and output capacitance. As a quick-start guide, Table 8-1 through Table 8-2 provide typical component values for a range of application parameters. The component values in these table represent stable designs and are not necessarily optimized. Note that the designs in these tables are based on a typical input voltage of 12V. For a complete design, use the quick start calculator tool associated with this family of devices and consult Section 8.2.1.

LM654A5-Q1 LM654B0-Q1 Example Single Phase Application Using Fixed Output Voltage and Internal Compensation Figure 8-1 Example Single Phase Application Using Fixed Output Voltage and Internal Compensation
LM654A5-Q1 LM654B0-Q1 Example Single Phase Application Using Adjustable Output Voltage and Internal Compensation Figure 8-2 Example Single Phase Application Using Adjustable Output Voltage and Internal Compensation
LM654A5-Q1 LM654B0-Q1 Example Single Phase Application Using Fixed Output Voltage and External Compensation Figure 8-3 Example Single Phase Application Using Fixed Output Voltage and External Compensation
LM654A5-Q1 LM654B0-Q1 Example Single Phase Application Using Adjustable Output Voltage and External Compensation Figure 8-4 Example Single Phase Application Using Adjustable Output Voltage and External Compensation
LM654A5-Q1 LM654B0-Q1 Simplified Two-Phase Application Circuit Example Figure 8-5 Simplified Two-Phase Application Circuit Example
LM654A5-Q1 LM654B0-Q1 Simplified Multi-Phase Application Circuit Example Figure 8-6 Simplified Multi-Phase Application Circuit Example
Table 8-1 Typical External Components for Fixed Output Voltage Mode
OUTPUT VOLTAGE FREQUENCY FB LM6xxB0 LM6xxA5 LM6xxA2 LM6xxA0
L COUT L COUT(1) L COUT(1) L COUT(1)
3.3V 400kHz GND 1μH 245μF 1.5μH 245μF 1.8μH 196μF 2.2μH 161μF
5V 400kHz VCC 1.5μH 175μF 1.8μH 175μF 2.2μH 140μF 2.7μH 115μF
3.3V 2200kHz GND 0.22μH 105μF 0.27μH 105μF 0.33μH 85μF 0.47μH 70μF
5V 2200kHz VCC 0.33μH 70μF 0.38μH 70μF 0.47μH 53μF 0.68μH 46μF
(1) All COUT values shown in these tables, and in this datasheet, represent the capacitance under the indicated D.C. bias and all other applicable derating.
Table 8-2 Typical External Components for LM6x4B0 in Adjustable Output Voltage Mode
OUTPUT VOLTAGE FREQUENCY L COUT PER PHASE(1) RFBT RFBB CFF RCOMP(2) CCOMP(2)
3.3V 400kHz 1μH 245μF 100kΩ 31.6kΩ 20pF 7.5kΩ/Ne 10nF × Ne
4.5V 400kHz 1.2μH 175μF 100kΩ 21.5kΩ 20pF 7.5kΩ/Ne 10nF × Ne
5V 400kHz 1.5μH 175μF 100kΩ 19.1kΩ 20pF 7.5kΩ/Ne 10nF × Ne
3.3V 2200kHz 0.22μH 105μF 100kΩ 31.6kΩ 10pF 7.5kΩ/Ne 2.2nF × Ne
4.5V 2200kHz 0.27μH 70μF 100kΩ 21.5kΩ 10pF 7.5kΩ/Ne 2.2nF × Ne
5V 2200kHz 0.33μH 70μF 100kΩ 19.1kΩ 10pF 7.5kΩ/Ne 2.2nF × Ne
(1) All COUT values shown in these tables, and in this datasheet, represent the capacitance under the indicated D.C. bias and all other applicable derating.
(2) Ne equals the number of secondary error amplifiers enabled in the application.