Dual 105mW Headphone Amplifier with Active-High
The LM4810 is a dual audio power amplifier capable of
delivering 105mW per channel of continuous average power
into a 16Ω load with 0.1% (THD+N) from a 5V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4810 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The unity-gain stable LM4810 can be configured by external
The LM4810 features an externally controlled, active-high,
micropower consumption shutdown mode, as well as an
internal thermal shutdown protection mechanism.
n THD+N at 1kHz, 105mW continuous average power into
16Ω 0.1% (typ)
n THD+N at 1kHz, 70mW continuous average power into
32Ω 0.1% (typ)
n Shutdown Current
n Active-high shutdown mode
n LLP, MSOP, and SO surface mount packaging
n "Click and Pop" suppression circuitry
n Low shutdown current
n No bootstrap capacitors required
n Unity-gain stable
n Cellular Phones
n Personal Computers
n Microphone Preamplifier
*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation DS200089