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.