SLVSIU6 March   2026 LMG1208

PRODUCT PREVIEW  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Swiching Characteristics
    7. 5.7 Timing Diagrams
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Input Buffer Stages
      2. 6.3.2  Enable (Applicable Only to Single PWM Mode)
      3. 6.3.3  MODE Configuration
      4. 6.3.4  SYNC Output Buffer
      5. 6.3.5  Integrated PWM Logic
      6. 6.3.6  Undervoltage Lockout (UVLO)
      7. 6.3.7  Level Shifter
      8. 6.3.8  Synchronous Bootstrap
      9. 6.3.9  Output Gate drivers
      10. 6.3.10 Negative Voltage Transients
      11. 6.3.11 Dead Time/Delay Pin
      12. 6.3.12 Current Sense Amplifier
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 VDD Bias Supply Voltage
        2. 7.2.2.2 Peak Source and Sink Currents
        3. 7.2.2.3 Power Dissipation
      3. 7.2.3 Application Curves: Buck Converter
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Package Option Addendum
    2. 10.2 Tape and Reel Information
    3. 10.3 Mechanical Data

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • VEG|16
散热焊盘机械数据 (封装 | 引脚)

6.3.12 Current Sense Amplifier

The LMG1208 features a trans-conductance amplifier with integrated high precision current sense. ISENP and ISENN terminals take in the differential input voltage and output IMON is the current output (with internal gain of 5μA/mV). The integrated amplifier first stage is powered by high input supply voltage VCS that can be tied to VIN of the power converter. Amplifier inputs have high common mode rejection and can tolerate up to 35V of common mode. The amplifier supports inductor DCR sense and shunt resistor sense and IMON can be used for current mode control, current balancing between multiple phases and over-current protection. Main features of the integrated current sense amplifier are low offset (< 500μV), low input leakage, large input differential range (± 150mV), and high bandwidth (5Mhz) which helps to eliminate any external current sensing amplifier on the PCB- saving cost and PCB space and reducing component count. To process the output current IMON, use an external resistor RREF and reference voltage VREF.

For inductor DCR sense, recommended resistor and capacitor values can be calculated from below equation

Equation 3. L R D C R = R E X T × C E X T

where

  • L = power converter inductor value
  • RDCR = DC resistance from inductor data sheet

If external RC is chosen as per above equation, then voltage across capacitor is reflected by below equation:

Equation 4. I L × R D C R = V C + - V C - = V C E X T

where

  • IL = inductor current (includes DC and ripple component)

Voltage at output terminal IMON is governed by below equation:

Equation 5. V I M O N = V C E X T × G a i n × R R E F + V R E F
LMG1208 Single PWM Mode With Current Sensing Figure 6-9 Single PWM Mode With Current Sensing