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LM4901LD-LM4901MM-LM4901MMX
1.6 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
LM4901
1.6 Watt Audio Power Amplifier with Selectable
Shutdown Logic Level
General DescriptionThe LM4901isan 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 and1.6 wattsof continuous avearge powertoa4Ω 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 LM4901 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 LM4901 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
pintobe drivenina likewise mannerto enable shutdown.
The LM4901 contains advanced pop& click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4901is unity-gain stable and canbe configuredby
external gain-setting resistors.
Key Specifications Improved PSRRat 217Hz& 1KHz 62dB Power Outputat 5.0V, 1% THD,4Ω 1.6W (typ) 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 packages: LLP, micro SMD,
and MSOP 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 User selectable shutdown Highor Low logic Level
Applications Mobile Phones PDAs Portable electronic devices
Typical ApplicationFIGURE1. Typical Audio Amplifier Application Circuit
December 2002
LM4901
att
Audio
Power
Amplifier
with
Selectable
Shutdown
Logic
Level
