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LM4903MM-LM4903MMX
1 Watt Audio Power Amplifier
LM4903 Watt Audio Power Amplifier
General DescriptionThe LM4903isan 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 LM4903 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 LM4903 featuresa low-power consumption shutdown
mode, whichis achievedby driving the shutdownpin with
logic low. Additionally,the LM4903 featuresan internal ther-
mal shutdown protection mechanism.
The LM4903 contains advanced pop& click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4903is unity-gain stable and canbe configuredby
external gain-setting resistors.
Key Specifications Improved PSRRat 217Hz& 1KHz 62dB Power Outputat 5.0V, 1% THD,8Ω 1.07W (typ) Power Outputat 3.0V, 1% THD,4Ω 525mW (typ) Power Outputat 3.0V, 1% THD,8Ω 390mW (typ) Shutdown Current 0.1µA (typ)
Features Availablein space-saving MSOP package Ultra low current shutdown mode BTL output can drive capacitive loads Improved pop& click circuitry eliminates noise during
turn-on and turn-off transitions 2.0- 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 Application200467D3
FIGURE1. Typical Audio Amplifier Application CircuitFebruary 2003
LM4903
att
Audio
Power
Amplifier
