SNVS470I January   2007  – November 2025 LM25576

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 High Voltage Start-Up Regulator
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown and Stand-by Mode
      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 and Input Drop-Out Voltage
      6. 6.4.6 Current Limit
      7. 6.4.7 Soft Start
      8. 6.4.8 Boost Pin
      9. 6.4.9 Thermal Protection
  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 Typical Schematic for High Frequency (1 MHz) Application
      2. 7.2.2 Typical Schematic for Buck and Boost (Inverting) Application
      3. 7.2.3 Design Requirements
        1. 7.2.3.1  R3 (RT)
        2. 7.2.3.2  L1
        3. 7.2.3.3  C3 (CRAMP)
        4. 7.2.3.4  C9, C10
        5. 7.2.3.5  D1
        6. 7.2.3.6  C1, C2
        7. 7.2.3.7  C8
        8. 7.2.3.8  C7
        9. 7.2.3.9  C4
        10. 7.2.3.10 R5, R6
        11. 7.2.3.11 R1, R2, C12
        12. 7.2.3.12 R7, C11
        13. 7.2.3.13 R4, C5, C6
      4. 7.2.4 Detailed Design Procedure
        1. 7.2.4.1 Custom Design With WEBENCH® Tools
      5. 7.2.5 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 PCB Layout
      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 Developmental 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

Package Options

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

5.5 Electrical Characteristics

Typical values correspond to TJ = 25°C, VIN = 24 V, RT = 32.4kΩ. Minimum and maximum limits apply over –40°C to 125°C junction temperature range unless otherwise stated.(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
STARTUP REGULATOR
VCC Reg VCC Regulator Output 6.85 7.15 7.45 V
VCC LDO Mode turn-off 9 V
VCC Current Limit VCC = 0 V, 25 mA
VCC SUPPLY
VCC UVLO Threshold VCC Increasing  5.03 5.35 5.67 V
VCC Undervoltage Hysteresis 0.25 V
Bias Current (Iin) FB = 1.3 V. 2 4.5 mA
Shutdown Current (Iin) SD = 0 V. 48 85 µA
SHUTDOWN THRESHOLDS
Shutdown Threshold 0.47 0.7 0.9 V
Shutdown Hysteresis 0.1 V
Standby Threshold 1.17 1.225 1.28 V
Standby Hysteresis 0.1 V
SD Pull-up Current Source 5 µA
SWITCH CHARACTERISTICS
Buck Switch Rds(on) 170 340 mΩ
BOOST UVLO 3.8 V
BOOST UVLO Hysteresis 0.8 V
Pre-charge Switch Rds(on) 70 Ω
Pre-charge Switch on-time 265 ns
CURRENT LIMIT
Cycle by Cycle Current Limit Delay RAMP = 2.5 V. 75 ns
SOFT-START
SS Current Source 7 10 14 µA
OSCILLATOR
Frequency1 180 200 220 kHz
Frequency2 RT = 11 kΩ. 425 485 545 kHz
SYNC Source Impedance 11 kΩ
SYNC Sink Impedance 110 Ω
SYNC Threshold (falling) 1.4 V
SYNC Frequency RT = 11 kΩ.  550 kHz
SYNC Pulse Width Minimum 15 ns
RAMP GENERATOR

Ramp Current 1		 VIN = 36 V, VOUT = 10 V. 136 160 184 µA
Ramp Current 2 VIN = 10 V, VOUT = 10 V. 18 25 32 µA
PWM COMPARATOR
Forced Off-time 416 500 575 ns
Min On-time 80 ns
COMP to PWM Comparator Offset 0.7 V
ERROR AMPLIFIER
Feedback Voltage Vfb = COMP. 1.207 1.225 1.243 µV
FB Bias Current 10 nA
DC Gain 70 dB
COMP Sink / Source Current 3 mA
Unity Gain Bandwidth 3 MHz
DIODE SENSE RESISTANCE
DSENSE 42 mΩ
THERMAL SHUTDOWN
Tsd Thermal Shutdown Threshold 165 °C
Tsd_hys Thermal Shutdown hysteresis 25 °C
(1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instruments' Average Outgoing Quality Level (AOQL).