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LM4929MM-LM4929MMX
LM4929 Stereo 40mW Low Noise Headphone Amplifier with OCL Output
LM4929
Stereo 40mW Low Noise Headphone Amplifier
with OCL Output
General DescriptionThe LM4929isan stereo audio power amplifier capableof
delivering 40mW per channelof continuous average power
intoa 16Ω loador 25mW per channel intoa 32Ω loadat 1%
THD+N froma3V power supply.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. Since the LM4929 does not require
bootstrap capacitorsor snubber networks,itis optimally
suitedfor low-power portable systems. The LM4929is con-
figuredfor OCL (Output Capacitor-Less) outputs, operating
withno DC blocking capacitorson the outputs.
The LM4929 featuresa low-power consumption shutdown
mode witha faster turnon time. Additionally, the LM4929
featuresan internal thermal shutdown protection mecha-
nism.
The LM4929is unity gain stable and maybe configured with
external gain-setting resistors.
Key Specifications PSRRat 217Hz and 1kHz 65dB (typ) Output Powerat 1kHz with VDD= 2.4V, THD+N intoa 16Ω load 25mW (typ) Output Powerat 1kHz with VDD= 3V, THD+N intoa 16Ω load 40mW (typ) Shutdown current 2.0µA (max) Output Voltage changeon release
from Shutdown VDD= 2.4V,RL =16Ω 1mV (max)
Features OCL outputs—No DC Blocking Capacitors External gain-setting capability Availablein space-saving MSOP package Ultra low current shutdown mode2V- 5.5V operation Ultra low noise
Applications Portable CD players PDAs Portable electronics devices
Block DiagramFIGURE1. Block Diagram
December 2004
LM4929
Stereo
40mW
Low
Noise
Headphone
Amplifier
with
OCL
Output
