SNOSB23C October 2008  – December 2014 LM5575-Q1


  1. Features
  2. Applications
  3. Description
  4. Simplified Schematic
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2Handling Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Shutdown and Standby
      2. 8.3.2Current Limit
      3. 8.3.3Soft-Start
      4. 8.3.4Thermal Protection
    4. 8.4Device Functional Modes
      1. 8.4.1High-Voltage Start-Up Regulator
      2. 8.4.2Oscillator and Sync Capability
      3. 8.4.3Error Amplifier and PWM Comparator
      4. 8.4.4Ramp Generator
      5. 8.4.5Boost Pin
      6. 8.4.6Maximum Duty Cycle and Input Drop-Out Voltage
  9. Application and Implementation
    1. 9.1Application Information
      1. 9.1.1Bias Power Dissipation Reduction
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. External Components
        2. R3 (RT)
        3. L1
        4. C3 (CRAMP)
        5. C9, C10
        6. D1
        7. C1, C2
        8. C8
        9. C7
        11., R6
        12., R2, C12
        13., C11
        14., C5, C6
      3. 9.2.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
    3. 11.3Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1Trademarks
    2. 12.2Electrostatic Discharge Caution
    3. 12.3Glossary
  13. 13Mechanical, Packaging, and Orderable Information

1 Features

  • LM5575-Q1 is an Automotive Grade Product That is AEC-Q100 Grade 0 Qualified
  • -40°C to 150°C Operating Junction Temperature
  • Integrated 75-V, 330-mΩ N-Channel MOSFET
  • Ultra-Wide Input Voltage Range From 6 V to 75 V
  • Adjustable Output Voltage as Low as 1.225 V
  • 1.65% Feedback Reference Accuracy
  • Operating Frequency Adjustable Between 50 kHz and 500 kHz With Single Resistor
  • Master or Slave Frequency Synchronization
  • Adjustable Soft-Start
  • Emulated Current Mode Control Architecture
  • Wide Bandwidth Error Amplifier
  • Built-In Protection

2 Applications

  • Automotive
  • Industrial

3 Description

The LM5575-Q1 is an easy-to-use SIMPLE SWITCHER® buck regulator which allows design engineers to design and optimize a robust power supply using a minimum set of components. Operating with an input voltage range of 6 - 75 V, the LM5575-Q1 delivers 1.5 A of continuous output current with an integrated 330-mΩ N-Channel MOSFET. The regulator utilizes an Emulated Current Mode architecture which provides inherent line regulation, tight load transient response, and ease-of-loop compensation without the usual limitation of low-duty cycles associated with current mode regulators. The operating frequency is adjustable from 50 kHz to 500 kHz to allow optimization of size and efficiency. To reduce EMI, a frequency synchronization pin allows multiple IC’s from the LM(2)557x devices to self-synchronize or to synchronize to an external clock. The LM5575-Q1 ensures robustness with cycle-by-cycle current limit, short-circuit protection, thermal shutdown, and remote shutdown. The device is available in a power enhanced TSSOP-16 package featuring an exposed die attach pad for thermal dissipation. The LM5575-Q1 is supported by the full suite of WEBENCH® On-Line design tools.

Device Information(1)

LM5575-Q1HTSSOP (16)5.00 mm × 4.40 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Simplified Schematic