SNVS588M September   2008  – November 2014 LM22672 , LM22672-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings: LM22672
    3. 6.3 Handling Ratings: LM22672-Q1
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical 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 Precision Enable and UVLO
      2. 7.3.2 Soft-Start
      3. 7.3.3 Switching Frequency Adjustment and Synchronization
      4. 7.3.4 Self-Synchronization
      5. 7.3.5 Boot-Strap Supply
      6. 7.3.6 Internal Loop Compensation
    4. 7.4 Device Functional Mode
      1. 7.4.1 Current Limit
      2. 7.4.2 Thermal Protection
      3. 7.4.3 Duty-Cycle Limits
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Output Voltage Divider Selection
      2. 8.1.2 Power Diode
    2. 8.2 Typical Application
      1. 8.2.1 Typical Buck Regulator Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 External Components
            1. 8.2.1.2.1.1 Inductor
            2. 8.2.1.2.1.2 Input Capacitor
            3. 8.2.1.2.1.3 Output Capacitor
            4. 8.2.1.2.1.4 Boot-strap Capacitor
        3. 8.2.1.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

5 Pin Configuration and Functions

8-Pin
HSOP Package
Top View
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Pin Functions

PIN TYPE DESCRIPTION APPLICATION INFORMATION
NAME NO.
BOOT 1 I Bootstrap input Provides the gate voltage for the high side NFET.
EN 5 I Enable input Used to control regulator start-up and shutdown. See Precision Enable and UVLO section of data sheet.
EP EP — Exposed Pad Connect to ground. Provides thermal connection to PCB. See Thermal Considerations.
FB 4 I Feedback input Feedback input to regulator.
GND 6 — Ground input to regulator;
system common		 System ground pin.
RT/SYNC Oscillator mode control input Used to control oscillator mode of regulator. See Switching Frequency Adjustment and Synchronization section of data sheet.
SS 2 I Soft-start input Used to increase soft-start time. See Soft-Start section of data sheet.
SW 8 O Switch output Switching output of regulator.
VIN I Input voltage Supply input to the regulator.