SNOSB23F October   2008  – July 2019 LM5575-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 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
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Shutdown and Standby
      2. 7.3.2 Current Limit
      3. 7.3.3 Soft Start
      4. 7.3.4 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 High-Voltage Start-Up Regulator
      2. 7.4.2 Oscillator and Sync Capability
      3. 7.4.3 Error Amplifier and PWM Comparator
      4. 7.4.4 Ramp Generator
      5. 7.4.5 BOOST Pin
      6. 7.4.6 Maximum Duty Cycle and Input Dropout Voltage
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Bias Power Dissipation Reduction
    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  External Components
        3. 8.2.2.3  R3 (RT)
        4. 8.2.2.4  L1
        5. 8.2.2.5  C3 (CRAMP)
        6. 8.2.2.6  C9, C10
        7. 8.2.2.7  D1
        8. 8.2.2.8  C1, C2
        9. 8.2.2.9  C8
        10. 8.2.2.10 C7
        11. 8.2.2.11 C4
        12. 8.2.2.12 R5, R6
        13. 8.2.2.13 R1, R2, C12
        14. 8.2.2.14 R7, C11
        15. 8.2.2.15 R4, C5, C6
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Custom Design With WEBENCH® Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.5 Electrical Characteristics

Specifications are for TJ = 25°C. VIN = 48 V, RT = 32.4 kΩ unless otherwise stated. (1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
START-UP REGULATOR
VccReg VCC regulator output 7.15 V
Over full operating junction temperature range 6.85 7.5
VCC LDO mode turnoff 9 V
VCC current limit VCC = 0 V 25 mA
VCC SUPPLY
VCC UVLO threshold (VCC increasing) 5.35 V
Over full operating junction temperature range 5.01 5.69
VCC undervoltage hysteresis 0.35 V
Bias current (Iin) FB = 1.3 V 3.7 mA
Over full operating junction temperature range 4.5
Shutdown current (Iin) SD = 0 V 57 µA
Over full operating junction temperature range 85
SHUTDOWN THRESHOLDS
Shutdown threshold (SD Increasing) 0.7 V
Over full operating junction temperature range 0.43 0.9
Shutdown hysteresis 0.1 V
Standby threshold (Standby Increasing) 1.225 V
Over full operating junction temperature range 1.15 1.30
Standby hysteresis 0.1 V
SD pullup current source 5 µA
SWITCH CHARACTERISTICS
Buck switch Rds(on) 330 mΩ
Over full operating junction temperature range 800
BOOST UVLO 4 V
BOOST UVLO hysteresis 0.56 V
Pre-charge switch Rds(on) 70 Ω
Pre-charge switch on-time 250 ns
CURRENT LIMIT
Cycle by cycle current limit RAMP = 0 V 2.1 A
Over full operating junction temperature range 1.8 2.7
Cycle by cycle current limit delay RAMP = 2.5 V 85 ns
SOFT START
SS current source 10 µA
Over full operating junction temperature range 7 14
OSCILLATOR
Frequency1 200 kHz
Over full operating junction temperature range 180 220
Frequency2 RT = 11 kΩ 485 kHz
Over full operating junction temperature range 425 545
SYNC source impedance 11 kΩ
SYNC sink impedance 110 Ω
SYNC threshold (falling) 1.3 V
SYNC frequency RT = 11 kΩ kHz
Over full operating junction temperature range 550
SYNC pulse width minimum Over full operating junction temperature range 15 ns
RAMP GENERATOR
Ramp current 1 VIN = 60 V, VOUT=10 V 550 µA
Over full operating junction temperature range 467 633
Ramp current 2 VIN = 10 V, VOUT= 10 V 50 µA
Over full operating junction temperature range 36 64
PWM COMPARATOR
Forced off-time 500 ns
Over full operating junction temperature range 390 626
Minimum on-time 80 ns
COMP to PWM comparator offset 0.7 V
ERROR AMPLIFIER
Feedback voltage VFB = COMP 1.225 V
Over full operating junction temperature range 1.205 1.245
FB bias current 17 nA
DC gain 70 dB
COMP sink / source current Over full operating junction temperature range 2.5 mA
Unity gain bandwidth 3 MHz
DIODE SENSE RESISTANCE
DSENSE 83 mΩ
THERMAL SHUTDOWN
TSD Thermal shutdown threshold 180 °C
Thermal shutdown hysteresis 25 °C
(1) Minimum and maximum 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 Average Outgoing Quality Level (AOQL).