1FEATURES
23• RF Suppression Circuitry
• Fully Differential Amplification
• Available in Space-Saving DSBGA and WSON
Packages
• Ultra Low Current Shutdown Mode
• Can Drive Capacitive Loads up to 100pF
• Improved Pop & Click Circuitry Eliminates
Noises During Turn-On and Turn-Off
Transitions
• 2.4 - 5.5V Operation
• No Output Coupling Capacitors, Snubber
Networks or Bootstrap Capacitors Required

APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices and Accessories

KEY SPECIFICATIONS
• Improved PSRR at 217Hz, 90dB (Typ)
• Output Power at 5.0V @ 1% THD+N (8Ω),
1.2W (Typ)
• Output Power at 3.0V @ 1% THD+N (8Ω),
400mW (Typ)
• Shutdown Current, 0.1μA (Typ)

DESCRIPTION
The LM4928 is an stereo fully differential stereo audio
power amplifier primarily designed for demanding
applications in mobile phones and other portable
communication devices. It is capable of delivering 1.2
watts of continuous average power to a 8Ω 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 LM4928 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 LM4928 features a low-power consumption
shutdown mode. To facilitate this, shutdown may be
enabled by logic low. Additionally, the LM4928
features an internal thermal shutdown protection
mechanism.
The LM4928 contains advanced pop & click circuitry which eliminates noises which would otherwise occur
during turn-on and turn-off transitions.