SNVS250F November   2004  – February 2016 LM3670

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Connection Diagram
  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 Circuit Operation
      2. 7.3.2 Soft Start
      3. 7.3.3 LDO - Low Dropout Operation
    4. 7.4 Device Functional Modes
      1. 7.4.1 PWM Operation
        1. 7.4.1.1 Internal Synchronous Rectification
        2. 7.4.1.2 Current Limiting
      2. 7.4.2 PFM Operation
      3. 7.4.3 Shutdown
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Typical Application: Fixed Output
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Inductor Selection
            1. 8.2.1.2.1.1 Method 1
            2. 8.2.1.2.1.2 Method 2
          2. 8.2.1.2.2 Input Capacitor Selection
          3. 8.2.1.2.3 Output Capacitor Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Typical Application: Adjustable Output
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Output Voltage Selection for Adjustable LM3670
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Community Resources
    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 Connection Diagram

DBV Package
5-Pin SOT-23
Top View
LM3670 20075802.gif

Pin Functions

PIN TYPE DESCRIPTION
NUMBER NAME
1 VIN Power Power supply input. Connect to the input filter capacitor
( Typical Application: Fixed Output).
2 GND Ground Ground pin.
3 EN Digital Enable input.
4 FB Analog Feedback analog input. Connect to the output filter capacitor
(Typical Application: Fixed Output).
5 SW Analog Switching node connection to the internal PFET switch and NFET synchronous rectifier. Connect to an inductor with a saturation current rating that exceeds the 750-mA maximum switch peak current limit specification.