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LM4925 Datasheet

  • LM4925

  • National Semiconductor [2 Cell, Single Ended Output, 40mW S...

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LM4925 2 Cell, Single Ended Output, 40mW Stereo Headphone Audio Amplifier
February 2005
LM4925
2 Cell, Single Ended Output, 40mW Stereo Headphone
Audio Amplifier
General Description
The unity gain stable LM4925 is both a mono differential
output (for BTL operation) audio amplifier and a Single
Ended (SE) stereo headphone amplifier. Operating on a
single 3V supply, the mono-BTL mode delivers 410mW into
an 8鈩?load at 1% THD+N. In Single Ended stereo head-
phone mode, the amplifier delivers 40mW per channel into a
16鈩?load at 1% THD+N.
With the LM4925 packaged in the MM and LLP packages,
the customer benefits include low profile and small size. This
package minimizes PCB area and maximizes output power.
The LM4925 features circuitry that reduces output transients
(鈥渃licks鈥?and 鈥減ops鈥? during device turn-on and turn-off, an
externally controlled, low-power consumption, active-low
shutdown mode, and thermal shutdown. Boomer audio
power amplifiers are designed specifically to use few exter-
nal components and provide high quality output power in a
surface mount package.
Key Specifications
n
n
n
n
n
n
n
Mono-BTL Output Power
(R
L
= 8鈩? V
DD
= 3.0V, THD+N = 1%)
410mW (typ)
Single Ended Output Power Per Channel
(R
L
= 16鈩? V
DD
= 3.0V, THD+N = 1%)
40mW (typ)
Micropower shutdown current
0.1碌A (typ)
Supply voltage operating range
1.5V
<
V
DD
<
3.6V
PSRR 100Hz, V
DD
= 3V, BTL
70dB (typ)
Features
n
BTL mode for mono speaker
n
2-cell 1.5V to 3.6V battery operation
n
Single ended headphone operation with output coupling
capacitors
n
Unity-gain stable
n
鈥淐lick and pop鈥?suppression circuitry for both Shutdown
and Mute
n
Active low micro-power shutdown
n
Active-low mute mode
n
Thermal shutdown protection circuitry
Applications
n
Portable two-cell audio products
n
Portable two-cell electronic devices
Typical Application
20121157
FIGURE 1. Block Diagram
Boomer
庐
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201211
www.national.com

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