LM4927 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – 2.5 Watt Fully Differential Audio Power Amplifier With Shutdown

April 2006
LM4927
2.5 Watt Fully Differential Audio Power Amplifier With
Shutdown
General Description
The LM4927 is a fully differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable communication device applica-
tions. It is capable of delivering 2.5 watts of continuous
average power to a 4Ω load with less than 10% distortion
(THD+N) from a 5V_DC power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4927 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4927 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by logic
low. Additionally, the LM4927 features an internal thermal
shutdown protection mechanism.
The LM4927 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
Key Specifications
j Improved PSRR at 217Hz
85dB (typ)
j Power Output at 5.0V @ 10% THD (4Ω) 2.5W (typ)
j Power Output at 3.3V @ 1% THD
550mW (typ)
j Shutdown Current
0.1µA (typ)
Features
n Fully differential amplification
n Available in space-saving micro-array LLP package
n Ultra low current shutdown mode
n Can drive capacitive loads up to 100pF
n Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n 2.4 - 5.5V operation
n No output coupling capacitors, snubber networks or
bootstrap capacitors required
Applications
n Mobile phones
n PDAs
n Portable electronic devices
Typical Application
20152529
FIGURE 1. Typical Audio Amplifier Application Circuit
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