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LM4980SD Datasheet

  • LM4980SD

  • National Semiconductor [2 Cell Battery, 1mA, 42mW Per Chann...

  • NSC

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LM4980 2 Cell Battery, 1mA, 42mW Per Channel High Fidelity Stereo Headphone Audio Amplifier
for MP3 players
July 2005
LM4980
2 Cell Battery, 1mA, 42mW Per Channel High Fidelity
Stereo Headphone Audio Amplifier for MP3 players
General Description
The LM4980 is a stereo headphone audio amplifier, which
when connected to a 3.0V supply, delivers 42mW to a 16鈩?/div>
load with less than 1% THD+N. With the LM4980 packaged
in the SD package, the customer benefits include low profile
and small size. This package minimizes PCB area and maxi-
mizes output power.
The LM4980 features circuitry that significantly reduces out-
put transients (鈥渃licks鈥?and 鈥減ops鈥? while driving headphones
during device turn-on and turn-off without costly external
additional circuitry. The LM4980 also includes an externally
controlled low-power consumption active-low shutdown
mode, and thermal shutdown. Boomer audio power amplifi-
ers are designed specifically to use few external compo-
nents and provide high quality output power in a surface
mount package.
Key Specifications
j
Output power
(RL = 16鈩? V
DD
= 3.0V, THD+N = 1%)
j
Quiescent current (V
DD
= 3V)
j
Micropower shutdown current
j
Supply voltage operating range
j
PSRR
@
1kHz, V
DD
= 3.0V
j
PSRR
@
217Hz, V
DD
= 3.0V
42mW (typ)
1mA (typ)
0.1碌A (typ)
1.5V
<
V
DD
<
3.3V
90dB (typ)
100dB (typ)
Features
n
2-cell 1.5V to 3.3V battery operation
n
Unity-gain stable
n
鈥淐lick and pop鈥?suppression circuitry for shutdown and
power on/off transient with headphone loads
n
Active low micro-power shutdown
n
Thermal shutdown protection circuitry
Applications
n
Portable two-cell audio products
n
Portable two-cell electronic devices
n
Portable MP3 player/recorders
Typical Application
20142901
FIGURE 1. Block Diagram
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201429
www.national.com

LM4980SD 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Class-AB

  • 0.042 W x 2 at 16 Ohms

  • 2-Channel Stereo

  • 47 dB (Typ)

  • 0.02 %

  • 3 V

  • + 85 C

  • LLP EP

  • Reel

  • 32 Ohms

  • Single

  • - 40 C

  • Single

  • Single

  • 3.3 V

  • 1.5 V

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