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LM4805LQ
3V, 1W Boosted Boomer
LM4805
3V, 1W Boosted Boomer
General DescriptionThe LM4805isa boosted audio power amplifier designedfor
driving 8ohm speakersin portable applications.It deliversat
least 1W continuous powertoan8Ω load from any input
voltage between3V and 4.6V with less than 2% THD+N.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. The LM4805 does not require boot-
strap capacitors,or snubber circuits. Thereforeitis ideally
suitedfor portable applications requiring high power and
minimal size.
The LM4805 featuresa low-power consumption shutdown
mode along withan internal thermal shutdown protection
mechanism and short circuit protection.
The LM4805 contains advanced pop& click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions. The LM4805is unity-gain
stable and canbe configuredby external gain-setting resis-
tors.
Key Specifications Quiescent Power Supply Current
(VDD= 3V) 14mA (typ) Output Power
(VDD= 3.0V,RL =8Ω, THD+N= 2%) 1W (typ) Shutdown Current 2µA (max)
Features Pop& click circuitry eliminates noise during turn-on and
turn-off transitions Low, 2µA (max) shutdown current Low, 14mA (typ) quiescent current Unity-gain stable External gain configuration capability
Applications Cellphone PTT (PushTo Talk) mobile phones
Connection Diagrams
LM4805LQ (5x5) LQ MarkingTop View
Order Number LM4805LQ
SeeNS Package Number LQA28A
Top View= Wafer Fab= Assembly Plant Code= Date Code= Die Run Code
May 2005
LM4805
3V,
Boosted
Boomer
