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1FEATURES

2? Available in Space-Saving WSON Package

? Ultra Low Current Shutdown Mode

? BTL Output Can Drive Capacitive Loads

? Improved Click and Pop Circuitry Eliminates

Noise During Turn-On and Turn-Off

Transitions

? 2.2 - 5.5V Operation

? No Output Coupling Capacitors, Snubber

Networks or Bootstrap Capacitors Required

? Unity-Gain Stable

? External Gain Configuration Capability

APPLICATIONS

? Mobile Phones

? PDAs

? Portable Electronic Devices

KEY SPECIFICATIONS

? Improved PSRR at 217Hz & 1KHz: 64 dB

(1KHz)

? Stereo Output Power at 5.0V, 1% THD, 8Ω:

1.07 W (typ)

? Stereo Output Power at 3.3V, 1% THD, 8Ω:

420 mW (typ)

? Shutdown Current, Vdd = 3.3V: 0.2 μA (typ)

DESCRIPTION

The LM4992 is a stereo audio power amplifier

primarily designed for demanding applications in

mobile phones and other portable communication

device applications. It is capable of delivering 1 watt,

per channel, of continuous average power to an 8Ω

BTL load with less than 1% distortion (THD+N) from

a 5VDC power supply.

Boomer audio power amplifiers were designed

specifically to provide high quality output power with a

minimal amount of external components. The LM4992 does not require output coupling capacitors

or bootstrap capacitors, and therefore is ideally suited

for mobile phone and other low voltage applications

where minimal power consumption is a primary

requirement.

The LM4992 features independent shutdown control

for each channel and a low-power consumption

shutdown mode, which is achieved by driving both

shutdown pins with logic low. Additionally, the

LM4992 features an internal thermal shutdown

protection mechanism.

The LM4992 contains advanced click and pop

circuitry which eliminates noise which would

otherwise occur during turn-on and turn-off

transitions.

The LM4992 is unity-gain stable and can be

configured by external gain-setting resistors.