SNAS470E October   2008  – November 2015 LM48100Q-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 for VDD = 5 V
    6. 6.6  Electrical Characteristics for VDD = 5 V at Extended Temperature Limits
    7. 6.7  Electrical Characteristics for VDD = 3.6 V
    8. 6.8  Electrical Characteristics for VDD = 3.6 V at Extended Temperature Limits
    9. 6.9  I2C Interface Characteristics for VDD = 5 V, 2.2 V ≤ I2C VDD ≤ 5.5 V
    10. 6.10 I2C Interface Characteristics for VDD = 5 V, 1.8 V ≤ I2C VDD ≤ 2.2 V
    11. 6.11 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Diagnostic Control
      2. 7.3.2 Fault Detection Control Register
      3. 7.3.3 General Amplifier Function
        1. 7.3.3.1 Bridge Configuration Explained
        2. 7.3.3.2 Input Mixer/Multiplexer
      4. 7.3.4 Output Fault Detection
        1. 7.3.4.1 Output Short to Supplies (VDD or GND)
        2. 7.3.4.2 Output Short Circuit and Open Circuit Detection
        3. 7.3.4.3 Output Over-Current Detection
        4. 7.3.4.4 Thermal Overload Detection
      5. 7.3.5 Open FAULT Output
      6. 7.3.6 Volume Control
      7. 7.3.7 Shutdown Function
      8. 7.3.8 Power Dissipation
    4. 7.4 Device Functional Modes
      1. 7.4.1 One-Shot Mode
      2. 7.4.2 Continuous Diagnostic Mode
    5. 7.5 Programming
      1. 7.5.1 Write-Only I2C Compatible Interface
      2. 7.5.2 I2C Bus Format
    6. 7.6 Register Maps
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Power Supply Bypassing/Filtering
        2. 8.2.2.2 Input Capacitor Selection
        3. 8.2.2.3 Bias Capacitor Selection
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Exposed DAP Mounting Considerations
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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1 Features

  • Output Fault Detection
  • I2C Volume and Mode Control
  • Input Mixer and Multiplexer
  • High PSRR
  • Individual 32-Step Volume Control
  • Short Circuit and Thermal Protection
  • Advanced Click-and-Pop Suppression
  • Low-Power Shutdown Mode
  • Available in 14-Pin HTSSOP Package
  • Key Specifications:
    • Output Power at VDD = 5 V, RL = 8 Ω,
      THD+N ≤ 1% 1.3 W (Typical)
    • Quiescent Power Supply Current at 5 V,
      6 mA (Typical)
    • PSRR at 1 kHz 74 dB (Typical)
    • Shutdown current 0.01 μA (Typical)

2 Applications

  • Automotive Instrument Clusters
  • Hands-Free Car Kits
  • Medical

3 Description

The LM48100Q-Q1 is a single supply, mono, bridge-tied load amplifier with I2C volume control, ideal for automotive applications. A comprehensive output fault detection system senses the load conditions, protecting the device during short circuit events, as well as detecting open circuit conditions.

Operating from a single 5-V supply, the LM48100Q-Q1 delivers 1.3 W of continuous output power to an 8 Ω load with < 1% THD+N. Flexible power supply requirements allow operation from 3 V to 5.5 V. High power supply rejection ratio (PSRR), 74 dB at 1 kHz, allows the device to operate in noisy environments without additional power supply conditioning.

The LM48100Q-Q1 features dual audio inputs that can be mixed/multiplexed to the device output. Each input path has its own independent, 32-step volume control. The mixer, volume control and device mode select are controlled through an I2C compatible interface. An open drain FAULT output indicates when a fault has occurred. Comprehensive output short circuit and thermal overload protection prevent the device from being damaged during a fault condition.

A low power shutdown mode reduces supply current consumption to 0.01 µA. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48100Q-Q1 is available in an 14-pin HTSSOP PowerPAD™ IC package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
LM48100Q-Q1 HTSSOP (14) 5.00 mm × 4.40 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Audio Amplifier Application Circuit

LM48100Q-Q1 30075833.gif