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LM4804LQ Datasheet

  • LM4804LQ

  • National Semiconductor [Low Voltage High Power Audio Power ...

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LM4804 Low Voltage High Power Audio Power Amplifier
March 2005
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鈩?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, R
L
= 8鈩?
j
BTL Output Power
11mA (typ)
1.8W (typ)
2碌A (max)
(R
L
= 8鈩? 2% THD+N, V
DD
= 3V)
j
Shutdown Current
Features
n
Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n
Low, 2碌A (max) shutdown current
n
Low, 11mA (typ) quiescent current (V
DD
= 4.2V, R
L
=
8鈩?
n
1.8W mono BTL output, R
L
= 8鈩? 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
20116737
Top View
U = Wafer Fab Code
Z = Assembly Plant Code
XY = Date Code
TT = Die Run Code
20116784
Top View
Order Number LM4804LQ
See NS Package Number LQA28A
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201167
www.national.com

LM4804LQ 产品属性

  • 1

  • 集成电路 (IC)

  • 线性 - 音頻放大器

  • Boomer®

  • AB 类

  • 1-通道（单声道）

  • 1.9W x 1 @ 8 欧姆

  • 2.7 V ~ 6.1 V

  • 消除爆音，短路保护和热保护，关闭

  • 表面贴装

  • 28-LLP-EP（5x5）

  • 28-WFQFN 裸露焊盘

  • 剪切带 (CT)

  • *LM4804LQLM4804LQCT

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