LM48100Q-Q1 (ACTIVE)

Mono 1.3W Audio Power Amplifier with Output Fault Detection and Volume Control

Mono 1.3W Audio Power Amplifier with Output Fault Detection and Volume Control - LM48100Q-Q1

Recommended alternative parts

  • TAS5421-Q1  -  Includes integrated diagnostics and load dump functions


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.


  • 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)

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Parametrics Compare all products in Speaker Amps

Audio Input Type
Speaker Channels (Max)
Power Stage Supply (Min) (V)
Power Stage Supply (Max) (V)
Output Power (W)
Load (Min) (ohms)
SNR (dB)
THD + N @ 1 kHz (%)
Iq (Typ) (mA)
Control Interface
Closed/Open Loop
Analog Supply (V) (Min)
Analog Supply (V) (Max)
Operating Temperature Range (C)
LM48100Q-Q1 TAS2505-Q1 TAS2521 TPA2005D1-Q1
Analog Input    Analog Input
Digital Input   
Analog Input
Digital Input   
Analog Input   
Class-AB    Class-D    Class-D    Class-D   
Mono    Mono    Mono    Mono   
3    2.7    1.5    4.4   
5.5    5.5    1.95    5.5   
2.4    2.6    2    1.18   
8    4    4    8   
104    94    94    97   
0.04    0.02    0.012    0.2   
4.4    0.002    0.002    2.8   
I2C    I2C, SPI    I2C
Closed    Closed    Open    Open   
3    1.5    1.5    4.5   
5.5    1.95    1.95    5.5   
74    47.2    47.2    75   
-40 to 105    -40 to 105    -40 to 85    -40 to 105
-40 to 85   
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