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LM4915LQ-LM4915LQX
LM4915 Pseudo-Differential Mono Headphone Amplifier with Fixed 6dB Gain
LM4915
Pseudo-Differential Mono Headphone Amplifier with
Fixed 6dB Gain
General DescriptionThe LM4915isa pseudo-differential audio power amplifier
primarily designedfor demanding applicationsin mobile
phones and other portable audio device applications with
mono headphones.Itis capableof delivering90 miliwattsof
continuous average powertoa 32Ω BTL load with less than distortion (THD+N) froma 3VDC power supply.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. The LM4915 doesnot require output
coupling capacitorsor bootstrap capacitors, and thereforeis
ideally suitedfor mobile phone and other low voltage appli-
cations where minimal power consumptionisa primaryre-
quirement.
The LM4915 featuresa low-power consumption shutdown
mode.To facilitate this, Shutdown maybe enabledby driving
the shutdown pin low. Additionally, the LM4915 featuresan
internal thermal shutdown protection mechanism.
The LM4915 contains advanced pop& click circuitry which
virtually eliminates noises which would otherwise occur dur-
ing turn-on and turn-off transitions.
The LM4915 hasan internally fixed gainof 6dB.
Key Specifications Improved PSRRat 217Hz and 1kHz 75dB (typ) Power Outputat 5.0V& 1% THD into 32Ω 280mW (typ) Power Outputat 3.0V& 1% THD into 32Ω 90mW (typ) Output Noise, A-weighted 20µV (typ)
Features Pseudo-differential amplification Internal gain-setting resistors Availablein space-saving LLP package Ultra low current shutdown mode Can drive capacitive loadsupto 500pF Improved pop& click circuitry virtually eliminates noises
during turn-on and turn-off transitions 2.2- 5.5V operation No output coupling capacitors, snubber networks,
bootstrap capacitorsor gain-setting resistors required Ultra low noise
Applications Mobile phones PDAs Portable electronics devices
Typical Application200482B4
FIGURE1. Typical Audio Amplifier Application CircuitMay 2003
LM4915
Pseudo-Differential
Mono
Headphone
Amplifier
with
Fixed
6dB
Gain
