LM4890 ,1 Watt Audio Power AmplifierFeaturesprovide high quality output power with a minimal amount ofexternal components. The LM4890 d ..
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LM4890IBLX ,1 Watt Audio Power Amplifierfeatures an internal ther-n No output coupling capacitors, snubber networks ormal shutdown protecti ..
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LP2985AIM5X-2.0 ,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 ..
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LP2985AIM5X-2.6 ,Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMD Packagesapplications.n Smallest possible size (SOT-23, micro SMD package)™Using an optimized VIP (Verticall ..
LP2985AIM5X-2.6 ,Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMD Packagesapplications.n Smallest possible size (SOT-23, micro SMD package)™Using an optimized VIP (Verticall ..
LP2985AIM5X-2.6 ,Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator in SOT-23 and micro SMD PackagesApplicationsuse absolute minimum board space.n Cellular PhonePrecision Output: 1% tolerance output ..
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LM4890
1 Watt Audio Power Amplifier
LM4890 Watt Audio Power Amplifier
General DescriptionThe LM4890isan audio power amplifier primarily designed
for demanding applicationsin mobile phones and other por-
table communication device applications.Itis capableof
delivering1 wattof continuous average powertoan8Ω BTL
load with less than 1% distortion (THD+N) froma 5VDC
power supply.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. The LM4890 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 LM4890 featuresa low-power consumption shutdown
mode, whichis achievedby driving the shutdownpin with
logic low. Additionally,the LM4890 featuresan internal ther-
mal shutdown protection mechanism.
The LM4890 contains advanced pop& click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4890is unity-gain stable and canbe configuredby
external gain-setting resistors.
Key Specifications PSRRat 217Hz, VDD=5V (Fig.1) 62dB(typ.) Power Outputat 5.0V& 1% THD 1W(typ.) Power Outputat 3.3V& 1% THD 400mW(typ.) Shutdown Current 0.1µA(typ.)
Features Availablein space-saving packages: micro SMD, MSOP,
SOIC, and LLP Ultra low current shutdown mode BTL output can drive capacitive loads Improved pop& click circuitry eliminates noises during
turn-on and turn-off transitions 2.2- 5.5V operation No output coupling capacitors, snubber networksor
bootstrap capacitors required Unity-gain stable External gain configuration capability
Applications Mobile Phones PDAs Portable electronic devices
Typical ApplicationFIGURE1. Typical Audio Amplifier Application Circuit
July 2002
LM4890
att
Audio
Power
Amplifier
