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LM4913MH Datasheet

  • LM4913MH

  • 2W Monaural, 90mW Stereo Headphone Audio Amplifier

  • 763.59KB

  • 15頁

  • NSC

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LM4913 2W Monaural, 90mW Stereo Headphone Audio Amplifier
December 2002
LM4913
2W Monaural, 90mW Stereo Headphone Audio Amplifier
General Description
The unity-gain stable LM4913 is both a mono differential
output (for bridge-tied loads, or BTL) audio power amplifier
and a single-ended (SE) stereo headphone amplifier. Oper-
ating on a single 5V supply, the mono BTL mode delivers 2W
(typ) to a 4鈩?load (Note 1) at 0.3% THD+N. In SE stereo
mode, the amplifier will deliver 90mW to 32鈩?loads. The
LM4913 features circuitry that suppresses output transients
("clicks and pops").
The LM4913 is designed for notebook and other handheld
portable applications. It delivers high quality output power
from a surface-mount package and requires few external
components. The LM4913 is pin and functionally compatible
with the TPA0213.
Other features include an active-low micro-power shutdown
mode and thermal shutdown protection.
The LM4913 is available a space efficient 10-lead exposed-
DAP TSSOP package.
Note 1:
When operating on a 5VDC supply, an LM4913MH that has been
properly mounted to a circuit board will deliver 2W into 4鈩? See the Applica-
tion Information sections for further information concerning PCB layout sug-
gestions to maximize the LM4913MH鈥檚 output power with a 4鈩?load.
Key Specifications
j
BTL output power (R
L
= 4鈩?
V
DD
= at 3.0V, THD = 1%
V
DD
= at 5.0V, THD = 0.3%
V
DD
= at 3.0V
V
DD
= at 5.0V
j
Micro-power shutdown supply current
j
PSRR (
@
1kHz, 2.9V
鈮?/div>
VDD
鈮?/div>
660mW (typ)
2W (typ)
33mW (typ)
90mW (typ)
1碌A(chǔ) (typ)
j
SE output power (R
L
= 32鈩?and THD = 0.1%)
5.1V, (Fig. 1))
BTL
SE
52dB (typ)
62dB (typ)
Features
n
n
n
n
n
n
n
n
Advanced "click and pop" suppression circuitry
Stereo headphone amplifier mode
Low current micro-power shutdown mode
Thermal shutdown protection circuitry
2.5V to 5.5V operation
Unity-gain stable
Gain set with external resistors
Space-saving exposed-DAP TSSOP package
Applications
n
PDAs
n
Cellular phones
n
Handheld portable electronic devices
Connection Diagram
200617A0
Top View
Order Number LM4913MH
See NS package Number MXF10A
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200617
www.national.com

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