SNAS714C November   2016  – August 2021 LMS3635-Q1 , LMS3655-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Tables
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Thermal Information (for Device Mounted on PCB)
    6. 7.6 Electrical Characteristics
    7. 7.7 System Characteristics
    8. 7.8 Timing Requirements
    9. 7.9 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
      1. 8.2.1 Control Scheme
    3. 8.3 Feature Description
      1. 8.3.1 RESET Flag Output
      2. 8.3.2 Enable and Start-Up
      3. 8.3.3 Soft-Start Function
      4. 8.3.4 Current Limit
      5. 8.3.5 Hiccup Mode
      6. 8.3.6 Synchronizing Input
      7. 8.3.7 Undervoltage Lockout (UVLO) and Thermal Shutdown (TSD)
      8. 8.3.8 Input Supply Current
    4. 8.4 Device Functional Modes
      1. 8.4.1 AUTO Mode
      2. 8.4.2 FPWM Mode
      3. 8.4.3 Dropout
      4. 8.4.4 Spread-Spectrum Operation
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 General Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 9.2.1.2.2 External Components Selection
            1. 9.2.1.2.2.1 Input Capacitors
            2. 9.2.1.2.2.2 Output Inductors and Capacitors
              1. 9.2.1.2.2.2.1 Inductor Selection
              2. 9.2.1.2.2.2.2 Output Capacitor Selection
          3. 9.2.1.2.3 Setting the Output Voltage
          4. 9.2.1.2.4 FB for Adjustable Output
          5. 9.2.1.2.5 VCC
          6. 9.2.1.2.6 BIAS
          7. 9.2.1.2.7 CBOOT
          8. 9.2.1.2.8 Maximum Ambient Temperature
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Fixed 5-V Output for USB-Type Applications
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
      3. 9.2.3 Fixed 3.3-V Output
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
        3. 9.2.3.3 Application Curves
      4. 9.2.4 6-V Adjustable Output
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
        3. 9.2.4.3 Application Curves
    3. 9.3 Do's and Don't's
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
        1. 12.1.2.1 Custom Design With WEBENCH® Tools
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

5 Device Comparison Tables

Table 5-1 LMS3635-Q1 Devices (3.5-A Output)
PART NUMBER OUTPUT VOLTAGE SPREAD SPECTRUM PACKAGE QTY WETTABLE FLANKS
LMS3635AQRNLRQ1 Adjustable No 3000 Y
LMS3635AQRNLTQ1 Adjustable No 250 Y
LMS36353QRNLRQ1 3.3 V No 3000 Y
LMS36353QRNLTQ1 3.3 V No 250 Y
LMS36355QRNLRQ1 5 V No 3000 Y
LMS36355QRNLTQ1 5 V No 250 Y
LMS3635MQRNLRQ1 Adjustable Yes 3000 Y
LMS3635MQRNLTQ1 Adjustable Yes 250 Y
LMS3635NQRNLRQ1 3.3 V Yes 3000 Y
LMS3635NQRNLTQ1 3.3 V Yes 250 Y
LMS3635LQRNLRQ1 5 V Yes 3000 Y
LMS3635LQRNLTQ1 5 V Yes 250 Y
LMS3635MQURNLRQ1 Adjustable Yes 3000 N
LMS3635LQURNLRQ1 5V Yes 3000 N
Table 5-2 LMS3655-Q1 Devices (5.5-A Output)
PART NUMBER OUTPUT VOLTAGE SPREAD SPECTRUM PACKAGE QTY WETTABLE FLANK
LMS3655AQRNLRQ1 Adjustable No 3000 Y
LMS3655AQRNLTQ1 Adjustable No 250 Y
LMS36553QRNLRQ1 3.3 V No 3000 Y
LMS36553QRNLTQ1 3.3 V No 250 Y
LMS36555QRNLRQ1 5 V No 3000 Y
LMS36555QRNLTQ1 5 V No 250 Y
LMS3655MQRNLRQ1 Adjustable Yes 3000 Y
LMS3655MQRNLTQ1 Adjustable Yes 250 Y
LMS3655NQRNLRQ1 3.3 V Yes 3000 Y
LMS3655NQRNLTQ1 3.3 V Yes 250 Y
LMS3655LQRNLRQ1 5 V Yes 3000 Y
LMS3655LQRNLTQ1 5 V Yes 250 Y
LMS3655MQURNLRQ1 Adjustable Yes 3000 N
LMS3655NQURNLRQ1 3.3 Yes 3000 N