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LM4923LQ-LM4923LQX
1.1 Watt Fully Differential Audio Power Amplifier With Shutdown Select
LM4923
1.1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select
General DescriptionThe LM4923isa fully differential audio power amplifier
primarily designedfor demanding applicationsin mobile
phones and other portable communication device applica-
tions.Itis capableof delivering1.1 wattof continuous aver-
age 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 LM4923 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 LM4923 featuresa low-power consumption shutdown
mode.To facilitate this, Shutdown maybe enabledby logic
low. Additionally, the LM4923 featuresan internal thermal
shutdown protection mechanism.
The LM4923 contains advanced pop& click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
Key Specifications Improved PSRRat 217Hz 85dB(typ) Power Outputat 5.0V@ 1% THD+N 1.1W(typ) Power Outputat 3.3V@ 1% THD+N 400mW(typ) Shutdown Current 0.1µA(typ)
Features Fully differential amplification Availablein space-saving LLP package Ultra low current shutdown mode Can drive capacitive loadsupto 100pF Improved pop& click circuitry eliminates noises during
turn-on and turn-off transitions 2.4- 5.5V operation No output coupling capacitors, snubber networksor
bootstrap capacitors required
Applications Mobile phones PDAs Portable electronic devices
Connection Diagrams Package 8 PinLQ MarkingTop View
Order Number LM4923LQ
SeeNS Package Number LQB08A
20071302
− Date Code− Die Traceability− Boomer− LM4923LQJuly 2004
LM4923
att
Fully
Differential
Audio
Power
Amplifier
ith
Shutdown
Select
