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LM4953 Datasheet

  • LM4953

  • Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver

  • 11頁

  • NSC

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LM4953 Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver
September 2005
LM4953
Ground-Referenced, Ultra Low Noise, Ceramic Speaker
Driver
General Description
The LM4953 is an audio power amplifier designed for driving
Ceramic Speaker in portable applications. When powered by
a 3.6V supply, it is capable of forcing 12.6Vpp across a 2碌F
+ 30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 LM4953 does not require boot-
strap capacitors, or snubber circuits. Therefore it is ideally
suited for display applications requiring high power and mini-
mal size.
The LM4953 features a low-power consumption shutdown
mode. Additionally, the LM4953 features an internal thermal
shutdown protection mechanism.
The LM4953 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4953 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j
Quiescent Power Supply Current (V
dd
= 3V) 7mA(typ)
j
BTL Voltage Swing
(2碌F+30鈩?load, 1% THD+N,
V
dd
= 3.6V)
j
Shutdown Current
12.6V
pp
(typ)
1碌A (max)
Features
n
Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n
Low, 1碌A (max) shutdown current
n
Low, 7mA (typ) quiescent current
n
12.6Vpp mono BTL output, load = 2碌F+ 30鈩?/div>
n
Thermal shutdown
n
Unity-gain stable
n
External gain configuration capability
Applications
n
Cellphone
n
PDA
Typical Application
20142168
FIGURE 1. Typical Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201421
www.national.com

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