SNOSB24C October   2008  – November 2025 LM5576-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 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 Shutdown / Standby
      2. 6.3.2 Soft Start
      3. 6.3.3 Thermal Protection
    4. 6.4 Device Functional Modes
      1. 6.4.1 High Voltage Start-Up Regulator
      2. 6.4.2 Oscillator and Sync Capability
      3. 6.4.3 Error Amplifier and PWM Comparator
      4. 6.4.4 Ramp Generator
      5. 6.4.5 Maximum Duty Cycle / Input Dropout Voltage
      6. 6.4.6 Boost Pin
      7. 6.4.7 Current Limit
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Bias Power Dissipation Reduction
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1  Custom Design With WEBENCH® Tools
        2. 7.2.2.2  External Components
        3. 7.2.2.3  R3 (RT)
        4. 7.2.2.4  L1
        5. 7.2.2.5  C3 (CRAMP)
        6. 7.2.2.6  C9, C10
        7. 7.2.2.7  D1
        8. 7.2.2.8  C1, C2
        9. 7.2.2.9  C8
        10. 7.2.2.10 C7
        11. 7.2.2.11 C4
        12. 7.2.2.12 R5, R6
        13. 7.2.2.13 R1, R2, C12
        14. 7.2.2.14 R7, C11
        15. 7.2.2.15 R4, C5, C6
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
      3. 7.4.3 Power Dissipation
      4. 7.4.4 Thermal Considerations
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Custom Design With WEBENCH® Tools
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

5.5 Electrical Characteristics

Typical values correspond to TJ = 25°C, VIN = 48V, RT = 32.4kΩ. Minimum and maximum limits apply over –40°C to 125°C junction temperature range unless otherwise stated.(1)
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
STARTUP REGULATOR
VCC RegVCC Regulator Output6.857.157.45V
VCC LDO Mode turn-off9V
VCC Current LimitVCC = 0V,25mA
VCC SUPPLY
VCC UVLO ThresholdVCC Increasing 5.035.355.67V
VCC Undervoltage Hysteresis0.25V
Bias Current (Iin)FB = 1.3V. 24.5mA
Shutdown Current (Iin)SD = 0V. 4885µA
SHUTDOWN THRESHOLDS
Shutdown Threshold0.470.70.9V
Shutdown Hysteresis0.1V
Standby Threshold1.171.2251.28V
Standby Hysteresis0.1V
SD Pull-up Current Source5µA
SWITCH CHARACTERISTICS
Buck Switch Rds(on)170340mΩ
BOOST UVLO3.8V
BOOST UVLO Hysteresis0.8V
Pre-charge Switch Rds(on)70Ω
Pre-charge Switch on-time265ns
CURRENT LIMIT
Cycle by Cycle Current Limit DelayRAMP = 2.5V.75ns
SOFT-START
SS Current Source71014µA
OSCILLATOR
Frequency1180200220kHz
Frequency2RT = 11kΩ. 425485545kHz
SYNC Source Impedance11kΩ
SYNC Sink Impedance110Ω
SYNC Threshold (falling)1.4V
SYNC FrequencyRT = 11kΩ. 550kHz
SYNC Pulse Width Minimum15ns
RAMP GENERATOR

Ramp Current 1		VIN = 60V, VOUT = 10V.235275315µA

Ramp Current 1		VIN = 36V, VOUT = 10V.136160184µA
Ramp Current 2VIN = 10V, VOUT = 10V.182532µA
PWM COMPARATOR
Forced Off-time416500575ns
Min On-time80ns
COMP to PWM Comparator Offset0.7V
ERROR AMPLIFIER
Feedback VoltageVfb = COMP. 1.2071.2251.243µV
FB Bias Current10nA
DC Gain70dB
COMP Sink / Source Current3mA
Unity Gain Bandwidth3MHz
DIODE SENSE RESISTANCE
DSENSE42mΩ
THERMAL SHUTDOWN
TsdThermal Shutdown Threshold 165°C
Thermal Shutdown hysteresis25°C
(1) Minimum and Maximum limits are 100% production tested at 25°C. Limits over the operating temperature range are specified through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instruments' Average Outgoing Quality Level (AOQL).