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LM4804 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4804
Description  Low Voltage High Power Audio Power Amplifier
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM4804
Low Voltage High Power Audio Power Amplifier
General Description
The LM4804 integrates a Boost Converter with an Audio
Power Amplifier to drive voice coil speakers in portable
applications. When powered by a 3V supply, it is capable of
creating 1.8W power dissipation in an 8
Ω bridge-tied-load
(BTL) with less than 1% THD+N.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4804 does not require boot-
strap capacitors, or snubber circuits. Therefore it is ideally
suited for portable applications requiring high output voltage
and minimal size.
The LM4804 features a micro-power shutdown mode. Addi-
tionally, the LM4804 features an internal thermal shutdown
protection mechanism.
The LM4804 contains advanced pop & click circuitry that
eliminates output transients which would otherwise occur
during power or shutdown cycles.
The LM4804 is unity-gain stable. Its closed-loop gain is
determined by the value of external, user selected resistors.
Key Specifications
j Quiescent Power Supply Current
(V
DD = 4.2V, RL =8
Ω)
11mA (typ)
j BTL Output Power
(R
L =8
Ω, 2% THD+N, V
DD = 3V)
1.8W (typ)
j Shutdown Current
2µA (max)
Features
n
Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n
Low, 2µA (max) shutdown current
n
Low, 11mA (typ) quiescent current (V
DD = 4.2V, RL =
8
Ω)
n
1.8W mono BTL output, R
L =8
Ω,V
DD =3V
n
Short circuit protection
n
Unity-gain stable
n
External gain configuration capability
Applications
n
Cellphone
n
PDA
Connection Diagrams
LM4804LQ (5x5)
LQ Marking
20116784
Top View
Order Number LM4804LQ
See NS Package Number LQA28A
20116737
Top View
U = Wafer Fab Code
Z = Assembly Plant Code
XY = Date Code
TT = Die Run Code
Boomer® is a registered trademark of National Semiconductor Corporation.
March 2005
© 2005 National Semiconductor Corporation
DS201167
www.national.com




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