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.