National-Semiconductor-LM48100QMH.pdf
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November 12, 2008
LM48100Q
Mono, 1.3W Audio Power Amplifier with Output Fault
Detection and Volume Control
General Description
The LM48100Q is a single supply, mono, bridge-tied load
amplifier with I
2
C volume control, ideal for automotive appli-
cations. A comprehensive output fault detection system sens-
es 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 environ-
ments 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 con-
trol and device mode select are controlled through an I
2
C
compatible interface. An open drain FAULT
output indicates
when a fault has occurred. Comprehensive output short cir-
cuit and thermal overload protection prevent the device from
being damaged during a fault condition.
A low power shutdown mode reduces supply current con-
sumption to 0.01µA. Superior click and pop suppression elim-
inates audible transients on power-up/down and during
shutdown. The LM48100Q is available in an 14-pin TSSOP
package
Key Specifications
■ Output Power at V
DD
= 5V,
R
L
= 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)
Features
■
Output Fault Detection
■
I
2
C Volume and Mode Control
■
Input Mixer/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 TSSOP Package
Applications
■
Automotive Instrument Clusters
■
Hands-free Car Kits
■
Medical
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 300758 www.national.com
LM48100Q Mono, 1.3W Audio Power Amplifier with Output Fault Detection and Volume Control
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