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LM4891LD-LM4891M-LM4891MM-LM4891MMX-LM4891MX Fast Delivery,Good Price
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LM4891LDNSN/a365avai1 Watt Audio Power Amplifier
LM4891MNSCN/a181avai1 Watt Audio Power Amplifier
LM4891MMNSN/a1000avai1 Watt Audio Power Amplifier
LM4891MMXNSN/a4990avai1 Watt Audio Power Amplifier
LM4891MXNSN/a58295avai1 Watt Audio Power Amplifier


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LM4892ITPX ,1 Watt Audio Power Amplifier with Headphone SenseApplicationsexternal gain-setting resistors.n Mobile Phonesn PDAsn Portable electronic devicesTypic ..
LM4892M ,1 Watt Audio Power Amplifier with Headphone SenseGeneral Description Key SpecificationsThe LM4892 is an audio power amplifier primarily designedj PS ..
LM4892M ,1 Watt Audio Power Amplifier with Headphone SenseElectrical Characteristics V =5V (Notes 1, 2)DDThe following specifications apply for V = 5V, A = 2 ..
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LM4891LD-LM4891M-LM4891MM-LM4891MMX-LM4891MX
1 Watt Audio Power Amplifier
LM4891 Watt Audio Power Amplifier
General Description

The LM4891isan 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 LM4891 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 LM4891 featuresa low-power consumption shutdown
mode, whichis achievedby driving the shutdownpin with
logic high. Additionally,the LM4891 featuresan internal ther-
mal shutdown protection mechanism.
The LM4891 contains advanced pop& click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4891is unity-gain stable and canbe configuredby
external gain-setting resistors.
Key Specifications
PSRRat 217Hz, VDD= 5V,8Ω Load 62dB (typ) Power Outputat 5.0V& 1% THD 1.0W (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 2.2to 5.5V operation No output coupling capacitors, snubber networksor
bootstrap capacitors required Thermal shutdown protection Unity-gain stable External gain configuration capability
Applications
Mobile Phones PDAs Portable electronic devices
Typical Application

FIGURE1. Typical Audio Amplifier Application Circuit
October 2002
LM4891
att
Audio
Power
Amplifier
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