© Semiconductor Components Industries, LLC, 2008
April, 2008 − Rev. 11
1 Publication Order Number:
NCP2809/D
NCP2809 Series
NOCAPt 135 mW Stereo
Headphone Power Amplifier
The NCP2809 is a cost−effective stereo audio power amplifier
capable of delivering 135 mW of continuous average power per
channel into 16 loads.
The NCP2809 audio power amplifier is specifically designed to
provide high quality output power from low supply voltage,
requiring very few external components. Since NCP2809 does not
require bootstrap capacitors or snubber networks, it is optimally
suited for low−power portable systems. NCP2809A has an internal
gain of 0 dB while specific external gain can externally be set with
NCP2809B.
If the application allows it, the virtual ground provided by the
device can be connected to the middle point of the headset (Figure 1).
In such case, the two external heavy coupling capacitors typically
used can be removed. Otherwise, you can also use both outputs in
single ended mode with external coupling capacitors (Figure 43).
Due to its excellent Power Supply Rejection Ratio (PSRR), it can
be directly connected to the battery, saving the use of an LDO.
Features
• 135 mW to a 16 Load from a 5.0 V Power Supply
• Excellent PSRR (85 dB Typical): Direct Connection to the Battery
• “Pop and Click” Noise Protection Circuit
• Ultra Low Current Shutdown Mode
• 2.2 V–5.5 V Operation
• Outstanding Total Harmonics Distortion + Noise (THD+N): Less
than 0.01%
• External Turn−on and Turn−off Configuration Capability
• Thermal Overload Protection Circuitry
• NCP2809B available in Ultra Thin UDFN Package (3x3)
• Pb−Free Packages are Available
Typical Applications
• Cellular Phone
• Portable Stereo
• MP3 Player
• Personal and Notebook Computers
Micro10
DM SUFFIX
CASE 846B
1
10
PIN CONNECTIONS
IN_R
OUT_R
SD
BYP
REF_I
V
M
V
P
110
2
3
4
9
8
7
MARKING
DIAGRAM
IN_L
5
OUT_L
6
MAx
AYWG
G
OUT_I
See detailed ordering and shipping information in the package
dimensions section on page 22 of this data sheet.
ORDERING INFORMATION
x = E for NCP2809A
C for NCP2809B
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
http://onsemi.com
(Note: Microdot may be in either location)
10 PIN DFN
MU SUFFIX
CASE 506AT
(Top View)
Micro10
2809B
ALYWG
G
IN_R
OUT_R
SD
BYP
REF_I
V
M
V
P
110
2
3
4
9
8
7
IN_L
5
OUT_L
6
OUT_I
(Top View)
UDFN10
