1FEATURES

2? Ground Referenced Outputs

? Differential Inputs

? I2C Volume and Mode Controls

? Available in Space-Saving DSBGA Package

? Ultra Low Current Shutdown Mode

? Advanced Output Transient Suppression

Circuitry Eliminates Noises During Turn-On

and Turn-Off Transitions

? 2.0V to 4.0V Operation (PVDD and SVDD)

? 1.8 to 4.0V Operation (I2CVDD)

? No Output Coupling Capacitors, Snubber

Networks, Bootstrap Capacitors, or Gain-

Setting Resistors Required

APPLICATIONS

? Notebook PCs

? Desktop PCs

? Mobile Phones

? PDAs

? Portable Electronic Devices

? MP3 Players

KEY SPECIFICATIONS

? Improved PSRR at 217Hz: 82dB (typ)

? Stereo Output Power at VDD = 3V, RL = 16Ω,

THD+N = 1%: 52mW (typ)

? Mono Output Power at VDD = 3V, RL = 16Ω,

THD+N = 1%: 93mW (typ)

? Shutdown current: 0.1μA (typ)

DESCRIPTION

With its directly-coupled output technology, the

LM48821 is a variable gain audio power amplifier

capable of delivering 52mWRMS per channel into a

16Ω single-ended load with less than 1% THD+N

from a 3V power supply. The I2C volume control has

a range of –76dB to 18dB.

The LM48821's Tru-GND technology utilizes

advanced charge pump technology to generate the

LM48821’s negative supply voltage. This eliminates

the need for output-coupling capacitors typically used

with single-ended loads.

Boomer audio power amplifiers were designed

specifically to provide high quality output power with a

minimal amount of external components. The

LM48821 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 LM48821 incorporates selectable low-power

consumption shutdown and channel select modes.

The LM48821 contains advanced output transient

suppression circuitry that eliminates noises which

would otherwise occur during turn-on and turn-off

transitions.