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LM4990-LM4990ITL-LM4990ITLX-LM4990LD-LM4990MHX-LM4990MM-LM4990MMX
2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level
LM4990 Watt Audio Power Amplifier with Selectable Shutdown
Logic Level
General DescriptionThe LM4990isan audio power amplifier primarily designed
for demanding applicationsin mobile phones and other por-
table communication device applications.Itis capableof
delivering 1.25 wattsof continuous average powertoan8Ω
BTL load and2 wattsof continuous average power (LD and only)toa 4Ω BTL load with less than 1% distortion
(THD+N+N) froma 5VDC power supply.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. The LM4990 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 LM4990 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 LM4990 contains advanced pop& click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4990is unity-gain stable and canbe configuredby
external gain-setting resistors.
Key Specifications Improved PSRRat 217Hz& 1KHz 62dB Power Outputat 5.0V, 1%
THD+N, (LD and MH only) 2W (typ) Power Outputat 5.0V, 1% THD+N,8Ω 1.25W (typ) Power Outputat 3.0V, 1% THD+N,4Ω 600mW (typ) Power Outputat 3.0V, 1% THD+N,8Ω 425mW (typ) Shutdown Current 0.1µA (typ)
Features Availablein space-saving packages: LLP, Exposed-DAP
TSSOP, MSOP, and ITL Ultra low current shutdown mode Improved pop& click circuitry eliminates noise 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 User selectable shutdown Highor Low logic Level
Applications Mobile Phones PDAs Portable electronic devices
Connection Diagrams
Mini Small Outline (MSOP) Package MSOP Marking200510B9
Top View
Order Number LM4990MM
See NS Package Number MUA08ATop View- Plant Code- Date Code- Die Traceability- Boomer Family- LM4990MM
October 2004
LM4990
att
Audio
Power
Amplifier
with
Selectable
Shutdown
Logic
Level
