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LM4961LQ-LM4961LQX
Ceramic Speaker Driver
LM4961
Ceramic Speaker Driver
General DescriptionThe LM4961isan audio power amplifier primarily designed
for driving Ceramic Speakerfor applicationsin Cell Phone
and PDAs.It integratesa boost converter, with variable
output voltage, withan audio power amplifier.Itis capableof
driving 15Vp-pin BTL modeto 2uF+30 ohms load, continu-
ous average power, with less than 1% distortion (THD+N)
froma 3.2VDC power supply.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal numberof
external components. The LM4961 does not require boot-
strap capacitors,or snubber circuits thereforeitis ideally
suitedfor portable applications requiring high voltage output drive capacitive loads like Ceramic Speakers. The
LM4961 featuresa low-power consumption shutdown mode.
Additionally, the LM4961 featuresan internal thermal shut-
down protection mechanism.
The LM4961 contains advanced pop& click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4961is unity-gain stable and canbe configuredby
external gain-setting resistors.
Key Specifications Quiescent Power Supply Current 7mA (typ) Voltage Swingin BTLat 1% THD 15Vp-p (typ) Shutdown current 0.1µA (typ)
Features Pop& click circuitry eliminates noise during turn-on and
turn-off transitions Low current shutdown mode Low quiescent current Mono 15Vp-p BTL output,RL= 2µF+30Ω,f= 1kHz Thermal shutdown protection Unity-gain stable External gain configuration capability Including Band exchange SW Including Leakagecut SW
Applications Cellphone PDA
Connection Diagram
LM4961LQ (5x5)Top View
Order Number LM4XXX
See NS Package Number
February 2005
LM4961
Ceramic
Speaker
Driver
