National Semiconductor Supplier Page   LM48100Q - Mono, 1.3W Audio Power Amplifier with Output Fault Detection and Volume Control from the PowerWise® Family

  • Overview
  • Features & Applications
  • Diagrams
  • Specifications


National Semiconductor LM48100Q

The LM48100Q 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 5V supply, the LM48100Q delivers 1.3W of continuous output power to an 8Ω load with < 1% THD+N. Flexible power supply requirements allow operation from 3.0V to 5.5V. High power supply rejection ratio (PSRR), 74dB at 1kHz, allows the device to operate in noisy environments without additional power supply conditioning.

The LM48100Q 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 I 2C 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 0.01µA. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48100Q is available in an 14-pin TSSOP package.

Features & Applications



RoHS Compliant


Typical ApplicationTypical Application


Connection Diagram

Typical Performance

Connection Diagram Typical Performance


Manufacturer Part Number Digi-Key Part Number Packaging Datasheet
LM48100QMH LM48100QMHETR-ND Tape & Reel  
LM48100QMHECT-ND Cut Tape Datasheet
LM48100QMHEDKR-ND Digi-Reel®  

PowerWise® Efficiency Specifications
Power@ 8Ohms, 1% THD 1.3 Watt
Power@ 8Ohms, 10% THD 1.6 Watt
THD .04 %
PSRR 74 dB
SNR 104 dB
Channels 1 Channels
Supply Range +3.0 - +5.0
THD Conditions Po=850mW,
PSRR Conditions Vripple-200mVp-p Sine,
Inputs AC ground,
Input refferred,
Cbias = 2.2uF
SNR Conditions Pout=400mW
Key Specifications
Output Power at:
VDD = 5V
RL = 8Ω
THD+N ≤ 1%
1.3W (typ)
Quiescent Power Supply Current at 5V 6mA (typ)
PSRR at 1kHz 74dB (typ)
Shutdown current 0.01μA (typ)
Reliability Metrics
Process CMOS7
EFR Reject 0
EFR Sample Size 13906
LTA Device Hours 862500
MTTF (Hours) 244736730