Earphone Amplifiers

LPA4809-Class AB Amplifiers
2.5-5.5Input Voltage(V):
Class ABClass:
140mW*2,5V@16Ω,0.1%Output Power(W):
2Output Channel:
XGain Control:
XShort Circuit Protection:
1Terminal Current(uA):

140mW Headphone Amplifier with Unity-gain Stable

General Description

The LPA4809 is a dual audio power amplifier capable of delivering 140mW per channel of continuous average power into a 16Ω load with 0.1%(THD+N) from a 5V power supply. Boomer audio power amplifier was designed specifically to provide high quality output power with a minimal amount of external components. Since the LPA4809 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The unity-gain stable LPA4809 can be configured by external gain-setting resistors. The LPA4809 features an externally controlled, active-low, micro power consumption shutdown mode, as well as an internal thermal shutdown protection mechanism.


Headphone Amplifier
Microphone Preamplifier
Personal Computers



THD+N at 1KHz at 140mW continuous average power into 16Ω 0.1%
THD+N at 1KHz at 80mW continuous average power into 32Ω 0.1%
Shutdown Current 0.4uA
Active-low shutdown mode
“Click and Pop” reduction circuitry
Low shutdown current
MSOP and SOP surface mount packaging
No bootstrap capacitors required
Unity-gain stable


Marking Information

Please see specification. 
Please ask our service mailbox for what you want which is marketing@lowpowersemi.com.
We will send a copy to you as fast as we can.


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