Preliminary Datasheet LPA4809
LPA4809–01 Sep.-2013 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 1 of 10
140mW Headphone Amplifier with Unity-gain Stable
General Description
The LPA4809 is a dual audio power amplifier capable of
delivering 140mW per channel of continuous average
power into a 16Ω load with 0.1 %(THD+N) from a 5V
power supply. Boomer audio power amplifier was
designed specifically to provide high quality output power
with a minimal amount of external components. Since the
LPA4809 does not require bootstrap capacitors or
snubber networks, it is optimally suited for low-power
portable systems. The unity-gain stable LPA4809 can be
configured by external gain-setting resistors. The
LPA4809 features an externally controlled, active-low,
micro power consumption shutdown mode, as well as an
internal thermal shutdown protection mechanism.
Order Information
LPA4809 - □ □ □
F: Pb-Free
Package Type
MS: MSOP8
Applications
Headphone Amplifier
Microphone Preamplifier
Personal Computers
PDA`s
Marking Information
Part No
Marking
Package
LPA4809MSF
LPS
LPA4809M
XYZ
MSOP8
Features
THD+N at 1KHz at 140mW continuous average
power into 16Ω 0.1%
THD+N at 1KHz at 80mW continuous average
power into 32Ω 0.1%
Shutdown Current 0.4uA
Active-low shutdown mode
“Click and Pop” reduction circuitry
Low shutdown current
MSOP8 surface mount packaging
No bootstrap capacitors required
Unity-gain stable
Typical Application Circuit
-
+
20kΩ
+
-
0.47μF
VIN2
VOUT2
AUDIO
INPUT
Rf2 20kΩ
GND
AUDIO
INPUT
20kΩ
0.47μF
Rf1 20kΩ
VIN1
Cs
1μF
4
6
7
1
2
20kΩ
VOUT1
20kΩ
90kΩ
90kΩ
VDD
BIAS
4.7μF
SHUTDOWN
CONTROL
VDD
SHUTDOWN
Bypass
CB
5
3
8
110kΩ
100kΩ
VDD
Co1
100μF
CI2
RI2
CI1
RI1
32Ω
Co2
100μF
32Ω
Preliminary Datasheet LPA4809
LPA4809–01 Sep.-2013 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 2 of 10
Functional Pin Description
Package Type
Pin Configurations
MOSP-8
Pin Description
Pin No.
Pin Name
DESCRIPTION
1
V
OUT1
Output of channel 1.
2
V
IN1
Signal input of channel 1.
3
Bypass
Bypass capacitor pin which increase chip performance.
4
GND
Ground pin.
5
SHUTDOWN
The device enters in shutdown mode when a low voltage is applied on this pin.
6
V
IN2
Signal input of channel 2.
7
V
OUT2
Output of channel 2.
8
V
DD
Supply voltage pin.