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LM4894IBP-LM4894IBPX-LM4894ITL-LM4894ITLX-LM4894LD-LM4894LDX-LM4894MM-LM4894MMX
1 Watt Fully Differential Audio Power Amplifier With Shutdown Select
LM4894 Watt Fully Differential Audio Power Amplifier With
Shutdown Select
General DescriptionThe LM4894isa fully differential audio power amplifier
primarily designedfor demanding applicationsin mobile
phones and other portable communication device applica-
tions.Itis capableof delivering1 wattof continuous average
powertoan 8Ω 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 LM4894 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 LM4894 featuresa low-power consumption shutdown
mode.To facilitate this, Shutdown maybe enabledby either
logic highor low dependingon mode selection. Driving the
shutdown modepin either highor low enablesthe shutdown
selectpintobe drivenina likewise mannerto enable Shut-
down. Additionally, the LM4894 featuresan internal thermal
shutdown protection mechanism.
The LM4894 contains advanced pop& click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4894is unity-gain stable and canbe configuredby
external gain-setting resistors.
Key Specifications Improved PSRRat 217Hz 80dB(typ) Power Outputat 5.0V& 1% THD 1.0W(typ) Power Outputat 3.3V& 1% THD 400mW(typ) Shutdown Current 0.1µA(typ)
Features Fully differential amplification Availablein space-saving packages micro SMD, MSOP,
and LLP Ultra low current shutdown mode Can drive capacitive loadsupto 500pF 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 Shutdown highor low selectivity High CMRR
Applications Mobile phones PDAs Portable electronic devices
Connection Diagrams
Mini Small Outline (MSOP) Package LLP PackageTop View
Order Number LM4894MM
See NS Package Number MUB10A
Top View
Order Number LM4894LD
See NS Package Number LDA10B
June 2003
LM4894
att
Fully
Differential
Audio
Power
Amplifier
ith
Shutdown
Select
