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LM4802BLQ-LM4802BLQX
Audio Power Amplifier with DC-DC converter to drive Ceramic Speakers
LM4802B
Audio Power Amplifier with Boost Converter to Drive
Ceramic Speakers
General DescriptionThe LM4802B integratesa Boost Converter withan Audio
Power Amplifierto drive Ceramic Speakersin portable ap-
plications. When poweredbya3V supply,itis capableof
forcing 12Vp-p acrossa 2µF+ 30Ω bridge-tied-load (BTL)
with less than1% THD+N.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. The LM4802B does not require boot-
strap capacitors,or snubber circuits. Thereforeitis ideally
suitedfor portable applications requiring high output voltage
and minimal size.
The LM4802B featuresa low-power consumption shutdown
mode. Additionally, the LM4802B featuresan internal ther-
mal shutdown protection mechanism.
The LM4802B contains advanced pop& click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4802Bis unity-gain stable.Its gainissetby external
resistors.
Key Specifications Quiescent Power Supply Current 12mA (typ) BTL Voltage Swing
(2µF+ 30Ω load, 1% THD+N,
VDD= 3V) 12Vp-p (typ) Shutdown Current 2µA (max)
Features Pop& click circuitry eliminates noise during turn-on and
turn-off transitions Low, 2µA (max) shutdown current Low, 12mA (typ) quiescent current 12Vp-p mono BTL output, load= 2µF+ 30Ω,VDD =3V Short circuit protection Unity-gain stable External gain configuration capability
Applications Cellphone PDA
Connection Diagram
LM4802BLQ (5x5)Top View
Order Number LM4802BLQ
SeeNS Package Number 2LQAQ028
November 2004
Audio
Power
Amplifier
with
Boost
Converter
Drive
Ceramic
Speakers
