SNVS372G August   2005  – October 2016 LM4132 , LM4132-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
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics LM4132-1.8 (VOUT = 1.8 V)
    6. 6.6  Electrical Characteristics LM4132-2 (VOUT = 2.048 V)
    7. 6.7  Electrical Characteristics LM4132-2.5 (VOUT = 2.5 V)
    8. 6.8  Electrical Characteristics LM4132-3 (VOUT = 3 V)
    9. 6.9  Electrical Characteristics LM4132-3.3 (VOUT = 3.3 V)
    10. 6.10 Electrical Characteristics LM4132-3.3-Q1(VOUT = 3.3 V)
    11. 6.11 Electrical Characteristics LM4132-4.1 (VOUT = 4.096 V)
    12. 6.12 Typical Characteristics
      1. 6.12.1 Typical Characteristics for 1.8 V
      2. 6.12.2 Typical Characteristics for 2.048 V
      3. 6.12.3 Typical Characteristics for 2.5 V
      4. 6.12.4 Typical Characteristics for 3 V
      5. 6.12.5 Typical Characteristics for 3.3 V
      6. 6.12.6 Typical Characteristics for 4.096 V
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Short Circuited Output
      2. 7.3.2 Turnon Time
      3. 7.3.3 Thermal Hysteresis
    4. 7.4 Device Functional Modes
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 LM4132 Typical Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Supply and Enable Voltages
          2. 8.2.1.2.2 Component Selection
          3. 8.2.1.2.3 Temperature Coefficient
          4. 8.2.1.2.4 Long-Term Stability
          5. 8.2.1.2.5 Expression of Electrical Characteristics
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Other Application Circuits
  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 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    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

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

10 Layout

10.1 Layout Guidelines

The mechanical stress due to PCB mounting can cause the output voltage to shift from its initial value. The center of a PCB generally has the highest mechanical and thermal expansion stress. Mounting the device near the edges or the corners of the board where mechanical stress is at its minimum. References in SOT-23 packages are generally less prone to assembly stress than devices in small outline (SOIC) packages.

A mechanical isolation of the device by creating an island by cutting a U shape slot (U - SLOT) on the PCB while mounting the device helps in reducing the impact of the PCB stresses on the output voltage of the reference. This approach would also provide some thermal isolation from the rest of the circuit.

Figure 54 shows a recommended printed board layout for LM4132 along with an in-set diagram, which exhibits a slot cut on three sides of the reference device.

Bypass capacitors must be mounted close to the device. Mounting bypass capacitors close to the device reduces the parasitic trace components, thereby improving performance.

10.2 Layout Example

LM4132 LM4132-Q1 LM4132_LayoutEx_FinalRev.gif Figure 54. Typical Layout Example With LM4132