SNAS133D – FEBRUARY 2001 – REVISED MARCH 2013
350mW Audio Power Amplifier with Shutdown Mode
Check for Samples: LM4819, LM4819MBD
•2 WSON, SOIC, and VSSOP Surface Mount
• Switch On/Off Click Suppression
• Unity-Gain Stable
• Minimum External Components
• THD+N at 1kHz, 350mW Continuous Average
Output Power into 16Ω: 10% (max)
• THD+N at 1kHz, 300mW Continuous Average
Output Power into 8Ω: 10% (max)
• Shutdown Current: 0.7μA (typ)
• General Purpose Audio
• Portable Electronic Devices
• Information Appliances (IA)
The LM4819 is a mono bridged power amplifier that
is capable 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 minimize 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
The closed loop response of the unity-gain stable
LM4819 can be configured using external gain-setting
resistors. The device is available in WSON, VSSOP,
and SOIC package types to suit various applications.
Figure 1. Typical Audio Amplifier Application Circuit
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