LM4912MMX ,LM4912 Stereo 40mW Low Noise Headphone AmplifierGeneral Description Key Specificationsn PSRR at 217 Hz and 1kHz 65dB (typ)The LM4912 is an stereo a ..
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LP2985IM5X-2.7 ,Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMD PackagesFeaturesn Ultra low dropout voltageThe LP2985 is a 150 mA, fixed-output voltage regulatordesigned t ..
LP2985IM5X-2.8 ,Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMD PackagesLP2985 Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMDPackagesMarch ..
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LM4912MM-LM4912MMX
LM4912 Stereo 40mW Low Noise Headphone Amplifier
LM4912
Stereo 40mW Low Noise Headphone Amplifier
General DescriptionThe LM4912isan stereo audio power amplifier capableof
delivering 40mW per channelof continuous average power
intoa 16Ω loador 25mW per channel intoa 32Ω loadat 1%
THD forma3V power supply.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. Since the LM4912 does not require
bootstrap capacitorsor snubber networks,itis optimally
suitedfor low-power portable systems.
The LM4912 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 LM4912 featuresan internal thermal
shutdown protection mechanism.
The LM4912is 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 1.0µA (max) Output Voltage changeon release from Shutdown
VDD= 2.4V,RL =16Ω 1mV (max) Output Noise, 20Hzto 20kHz, A-weighted 10µV (typ)
Features External gain-setting capability Availablein space-saving MSOP package Ultra low current shutdown mode Mute mode allows fast turn-on (10ms) with less than
1mV changeon outputs 2.0V- 5.5V operation Ultra low noise Operationat low supply voltages
Applications Portable CD players PDAs Portable electronics devices
Typical ApplicationFIGURE1. Typical Capacitive Coupled Output Configuration Circuit
June 2003
LM4912
Stereo
40mW
Low
Noise
Headphone
Amplifier
