350mW Audio Power Amplifier with Shutdown Mode
The LM4819 is a mono bridged power amplifier that is ca-
pable of delivering 350mWRMS output power into a 16Ω load
or 300mWRMS output power into an 8Ω load with 10%
THD+N from a 5V power supply.
The LM4819 Boomer audio power amplifier is designed
specifically to provide high quality output power and mini-
mize PCB area with surface mount packaging and a minimal
amount of external components. Since the LM4819 does not
require output coupling capacitors, bootstrap capacitors or
snubber networks, it is optimally suited for low-power por-
The closed loop response of the unity-gain stable LM4819
can be configured using external gain-setting resistors. The
device is available in LLP, MSOP, and SO package types to
suit various applications.
n THD+N at 1kHz, 350mW continuous average output
power into 16Ω
n THD+N at 1kHz, 300mW continuous average output
power into 8Ω
n Shutdown Current
n LLP, SOP, and MSOP surface mount packaging.
n Switch on/off click suppression.
n Unity-gain stable.
n Minimum external components.
n General purpose audio
n Portable electronic devices
n Information Appliances (IA)
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation DS200136