LM4899 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 1 Watt Fully Differential Audio Power Amplifier With Shutdown Select and Fixed 6dB Gain

July 2003
LM4899
1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select and Fixed 6dB Gain
General Description
The LM4899 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 1 watt of continuous average
power to an 8Ω load with less than 1% 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 LM4899 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 LM4899 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by either
logic high or low depending on mode selection. Driving the
shutdown mode pin either high or low enables the shutdown
select pin to be driven in a likewise manner to enable Shut-
down. Additionally, the LM4899 features an internal thermal
shutdown protection mechanism.
The LM4899 contains advanced pop & click circuitry which
virtually eliminates noises which would otherwise occur dur-
ing turn-on and turn-off transitions.
The LM4899 has an internally fixed gain of 6dB.
Key Specifications
j Improved PSRR at 217Hz
j Power Output at 5.0V & 1% THD
j Power Output at 3.3V & 1% THD
j Shutdown Current
83dB
1.0W(typ.)
400mW(typ.)
0.1µA(typ.)
Features
n Fully differential amplification
n Internal-gain-setting resistors
n Available in space-saving packages micro SMD, MSOP
and LLP
n Ultra low current shutdown mode
n Can drive capacitive loads up to 500pF
n Improved pop & click circuitry which virtually 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
n Shutdown high or low selectivity
Applications
n Mobile phones
n PDAs
n Portable electronic devices
Connection Diagrams
9 Bump micro SMD Package
9 Bump micro SMD Marking
200645A0
Top View
Order Number LM4899ITL, LM4899ITLX
See NS Package Number TLA09AAA
200645C7
X - Date Code
T - Die Run Traceability
G - Boomer Family
C1 - LM4899ITL
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200645
www.national.com