LM48100Q Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – Mono, 1.3W Audio Power Amplifier with Output Fault Detection and Volume Control

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 I²C 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 I²C
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%
■ Quiescent Power Supply Current
at 5V
■ PSRR at 1kHz
■ Shutdown current
Features
■ ^{Output Fault Detection}
■ ^{I2C 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
1.3W (typ)
6mA (typ)
74dB (typ)
0.01μA (typ)
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