SNVS487E December   2006  – January 2015 LM27313 , LM27313-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 ESD Ratings: LM27313
    3. 6.3 ESD Ratings: LM27313-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
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Application Circuit VIN=5.0 V, VOUT=12.0 V, Iload=250 mA
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Selecting the External Capacitors
          2. 8.2.1.2.2  Selecting the Output Capacitor
          3. 8.2.1.2.3  Selecting the Input Capacitor
          4. 8.2.1.2.4  Feed-Forward Compensation
          5. 8.2.1.2.5  Selecting Diodes
          6. 8.2.1.2.6  Setting the Output Voltage
          7. 8.2.1.2.7  Duty Cycle
          8. 8.2.1.2.8  Inductance Value
          9. 8.2.1.2.9  Maximum Switch Current
          10. 8.2.1.2.10 Calculating Load Current
          11. 8.2.1.2.11 Design Parameters VSW and ISW
          12. 8.2.1.2.12 Minimum Inductance
          13. 8.2.1.2.13 Inductor Suppliers
          14. 8.2.1.2.14 Shutdown Pin Operation
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Application Circuit VIN=5.0V, VOUT=20.0V, Iload=150mA
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 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 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    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

1 Features

  • LM27313-Q1 is an Automotive-Grade Product that is AEC-Q100 Grade 1 Qualified (–40°C to +125°C Operating Junction Temperature)
  • 30-V DMOS FET Switch
  • 1.6-MHz Switching Frequency
  • Low RDS(ON) DMOS FET
  • Switch Current up to 800 mA
  • Wide Input Voltage Range (2.7 V to 14 V)
  • Low Shutdown Current (< 1 µA)
  • 5-Lead SOT-23 Package
  • Uses Tiny Capacitors and Inductors
  • Cycle-by-Cycle Current Limiting
  • Internally Compensated

2 Applications

  • White LED Current Source
  • PDAs and Palm-Top Computers
  • Digital Cameras
  • Portable Phones, Games, and Media Players
  • GPS Devices

3 Description

The LM27313/-Q1 switching regulator is a current-mode boost converter with a fixed operating frequency of 1.6 MHz.

The use of the SOT-23 package, made possible by the minimal losses of the 800-mA switch, and the small inductors and capacitors result in extremely high power density. The 30-V internal switch makes these solutions perfect for boosting to voltages of 5 V to 28 V.

This device has a logic-level shutdown pin that can be used to reduce quiescent current and extend battery life.

Protection is provided through cycle-by-cycle current limiting and thermal shutdown. Internal compensation simplifies design and reduces component count.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM27313 SOT-23 (5) 2.90 mm x 1.60 mm
LM27313-Q1
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Circuit

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Efficiency vs. Load Current

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