1 Features
1• 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 LM48100QQ1
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.