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LM4911LD-LM4911LDX-LM4911MM-LM4911MMX
LM4911 Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL Output
LM4911
Stereo 40mW Low Noise Headphone Amplifier with
Selectable Capacitive Coupled or OCL Output
General DescriptionThe LM4911isan 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 LM4911 does not require
bootstrap capacitorsor snubber networks,itis optimally
suited for low-power portable systems.In addition, the
LM4911 maybe configuredfor either single-ended capaci-
tively coupled outputsorfor OCL outputs (patent pending).
The LM4911 featuresa low-power consumption shutdown
mode anda power mute mode that allowsfor faster turnon
time with less than 1mV voltage changeat outputsonre-
lease. Additionally, the LM4911 featuresan internal thermal
shutdown protection mechanism.
The LM4911is 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, 1% THD+N into
a16Ω load 25mW (typ) Output Powerat 1kHz with VDD=3V, 1% THD+N intoa
16Ω load 40mW (typ) Shutdown Current 2.0µA (max) Output Voltage changeon release from Shutdown
VDD= 2.4V,RL =16Ω (C-Coupled) 1mV (max) Mute Current 100µA (max)
Features OCLor capacitively coupled outputs (patent pending) External gain-setting capability Availablein space-saving MSOP andLD packages Ultra low current shutdown mode Mute mode allows fast turn-on (1ms) with less than 1mV
changeon outputs2V- 5.5V operation Ultra low noise
Applications Portable CD players PDAs Portable electronics devices
Block DiagramFIGURE1. Block Diagram
February 2003
LM491
Stereo
40mW
Low
Noise
Headphone
Amplifier
with
Selectable
Capacitive
Coupled
OCL
Output
