SNVS280I April   2004  – October 2018 LM5008

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Circuit and Block Diagram
  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 Switching Characteristics
    7. 6.7 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 Hysteretic Control Circuit Overview
      2. 7.3.2 High Voltage Start-Up Regulator
      3. 7.3.3 Regulation Comparator
      4. 7.3.4 Overvoltage Comparator
      5. 7.3.5 On-Time Generator and Shutdown
      6. 7.3.6 Current Limit
      7. 7.3.7 N-Channel Buck Switch and Driver
      8. 7.3.8 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Minimum Load Current
    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
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Custom Design With WEBENCH® Tools
      3. 11.1.3 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
        1. 11.2.1.1 PCB Layout Resources
        2. 11.2.1.2 Thermal Design Resources
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.1 Design Requirements

A guide for determining the component values will be illustrated with a design example. Table 1 lists the bill of materials for this application. The following steps will configure the LM5008 for:

  • Input voltage range (VIN): 12 V to 95 V
  • Output voltage (VOUT1): 10 V
  • Load current (for continuous conduction mode): 100 mA to 300 mA
  • Maximum ripple at VOUT2: 100 mVp-p at maximum input voltage

Table 1. Bill of Materials (Circuit of Figure 10)

ITEM DESCRIPTION PART NUMBER VALUE
C1 Ceramic Capacitor TDK C4532X7R2A105M 1 µF, 100 V
C2 Ceramic Capacitor TDK C4532X7R1E156M 15 µF, 25 V
C3 Ceramic Capacitor Kemet C1206C104K5RAC 0.1 µF, 50 V
C4 Ceramic Capacitor Kemet C1206C103K5RAC 0.01 µF, 50 V
C5 Ceramic Capacitor TDK C3216X7R2A104M 0.1 µF, 100 V
D1 Ultra-Fast Power Diode ON Semi MURA110T3 100 V, 1 A
L1 Power Inductor Coilcraft DO3316-224 or 220 µH
TDK SLF10145T-221MR65
R1 Resistor Vishay CRCW12063011F 3.01 kΩ
R2 Resistor Vishay CRCW12061001F 1 kΩ
R3 Resistor Vishay CRCW12062R00F 2 Ω
RON Resistor Vishay CRCW12063573F 357 kΩ
RCL Resistor Vishay CRCW12062673F 267 kΩ
U1 Switching Regulator Texas Instruments LM5008