SNAS491C February   2010  – January 2025 LM48580

PRODUCTION DATA  

  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: VDD = 3.6 V #GUID-238D0643-98EF-4676-B2E1-A584A5DF74F7/SNAS491599
    6. 5.6 Typical Performance Characteristics
  7.   Parameter Measurement Information
  8. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Class H Operation
      2. 6.3.2 Properties of Piezoelectric Elements
      3. 6.3.3 Differential Amplifier Explanation
      4. 6.3.4 Thermal Shutdown
      5. 6.3.5 Gain Setting
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown Function
  9. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
        1. 7.2.1.1 Proper Selection of External Components
          1. 7.2.1.1.1 Boost Converter Capacitor Selection
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Boost Converter Output Capacitor Selection
          1. 7.2.2.1.1 Inductor Selection
          2. 7.2.2.1.2 Diode Selection
        2. 7.2.2.2 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  10. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Community Resources
    4. 8.4 Trademarks
  11. 9 Revision History
  12. 10Mechanical, Packaging, and Orderable Information

6.1 Overview

The LM48580 is a fully differential, Class H ceramic element driver for ceramic speakers and haptic actuators. The integrated, high efficiency boost converter dynamically adjusts the amplifier’s supply voltage based on the output signal, increasing headroom and improving efficiency compared to a conventional Class AB driver. The fully differential amplifier takes advantage of the increased headroom and bridge-tied load (BTL) architecture, delivering significantly more voltage than a single-ended amplifier.