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
W
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
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MARKING
DIAGRAM
10
1
Micro10
DM SUFFIX
CASE 846B
MAx
AYW
•
•
•
•
•
•
•
X = E for NCP2809A
X =
C for NCP2809B
A = Assembly Location
Y = Year
W = Work Week
Pb−Free Package is Available
135 mW to a 16
W
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
Typical Applications
PIN CONNECTIONS
IN_R
SD
BYP
REF_I
IN_L
1
2
3
4
5
10
9
8
7
6
OUT_R
V
M
OUT_I
V
P
OUT_L
•
•
•
•
Cellular Phone
Portable Stereo
MP3 Player
Personal and Notebook Computers
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 20 of this data sheet.
©
Semiconductor Components Industries, LLC, 2004
1
November, 2004 − Rev. 7
Publication Order Number:
NCP2809/D
NCP2809 Series
V
P
1
mF
C
S
V
P
AUDIO
INPUT
C
I
390 nF
BYPASS
C
bypass
AUDIO
INPUT
1
mF
C
I
390 nF
V
IH
V
IL
SHUTDOWN
V
M
IN_R
20 kW
20 kW
SHUTDOWN
CONTROL
+
−
IN_L
V
P
20 kW
BYPASS
V
MC
BRIDGE
20 kW
−
+
+
−
OUT_L
HEADPHONE JACK
LEFT
OUT_I
SLEEVE
REF_I
RIGHT
OUT_R
Figure 1. NCP2809A Typical Application Schematic without Output Coupling Capacitor
(NOCAP Configuration)
V
P
1
mF
C
S
V
P
AUDIO
INPUT
C
I
390 nF
IN_L
20 kW
V
P
BYPASS
1
mF
C
I
390 nF
BYPASS
V
MC
BRIDGE
20 kW
−
+
+
−
OUT_L
220
mF
+
C
out
OUT_I
REF_I
NC
NC
220
mF
+
C
out
SLEEVE
RIGHT
HEADPHONE JACK
LEFT
AUDIO
INPUT
IN_R
20 kW
+
−
20 kW
OUT_R
V
IH
V
IL
SHUTDOWN
V
M
SHUTDOWN
CONTROL
Figure 2. NCP2809A Typical Application Schematic with Output Coupling Capacitor
TIP
(LEFT)
RING
SLEEVE
(RIGHT)
Figure 3. Typical 3−Wire Headphone Plug
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2
NCP2809 Series
20 kW
V
P
1
mF
C
I
390 nF
BYPASS
C
bypass
1
mF
+
−
C
S
V
P
V
P
−
+
+
−
OUT_L
HEADPHONE JACK
LEFT
V
MC
BRIDGE
OUT_I
SLEEVE
REF_I
RIGHT
AUDIO
INPUT
C
I
390 nF
SHUTDOWN
V
M
V
IH
V
IL
20 kW
SHUTDOWN
CONTROL
20 kW
IN_R
OUT_R
AUDIO
INPUT
20 kW
IN_L
BYPASS
Figure 4. NCP2809B Typical Application Schematic without Output Coupling Capacitor
(NOCAP Configuration)
20 kW
V
P
1
mF
C
S
V
P
AUDIO
INPUT
C
I
390 nF
BYPASS
C
bypass
1
mF
20 kW
IN_L
V
P
BYPASS
V
MC
BRIDGE
−
+
+
−
OUT_L
220
mF
+
C
out
OUT_I
REF_I
NC
NC
220
mF
+
C
out
SLEEVE
RIGHT
HEADPHONE JACK
LEFT
AUDIO
INPUT
C
I
390 nF
20 kW
IN_R
+
−
OUT_R
SHUTDOWN
V
IH
V
IL
V
M
SHUTDOWN
CONTROL
20 kW
Figure 5. NCP2809B Typical Application Schematic with Output Coupling Capacitor
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3
NCP2809 Series
PIN FUNCTION DESCRIPTION
Pin
1
2
3
4
Type
I
I
I
O
Symbol
IN_R
SHUTDOWN
BYPASS
REF_I
Description
Negative input of the second amplifier. It receives the audio input signal. Connected to the input
capicator C
in
(NCP2809A) or the external R
in
(NCP2809B).
The device enters in shutdown mode when a a low level is applied on this pin.
Bypass capacitor pin which provides the common mode voltage (V
P
/2).
Virtual ground amplifier feed back. This pin sets the stereo headset ground. In order to improve
crosstalk, this pin must be connected as close as possible to the ground connection of the headset
(ideally at the ground pin of the headset connector). When one uses bypassing capacitors, this pin
must be left unconnected.
Negative input of the first amplifier. It receives the audio input signal. Connected to the input
capacitor C
in
(NCP2809A) or the external R
in
(NCP2809B).
Stereo headset amplifier analog output left. This pin will output the amplified analog signal and,
depending on the application, must be coupled with a capacitor or directly connected to the left
loudspeaker of the headset. This output is able to drive a 16
W
load in a single−ended configuration.
Positive analog supply of the cell. Range: 2.2 V – 5.5 V
Virtual ground for stereo Headset common connection. This pin is directly connected to the
common connection of the headset when use of bypassing capacitor is not required. When one
uses bypassing capacitors, this pin must be left unconnected.
Analog Ground
Stereo headset amplifier analog output right. This pin will output the amplified analog signal and,
depending on the application, must be coupled with a capacitor or directly connected to the right
loudspeaker of the headset. This output is able to drive a 16
W
load in a single−ended configuration.
5
6
I
O
IN_L
OUT_L
7
8
I
O
V
P
OUT_I
9
10
I
O
V
M
OUT_R
MAXIMUM RATINGS
(T
A
= +25°C)
Rating
Supply Voltage
Operating Supply Voltage
Input Voltage
Max Output Current
Power Dissipation
Operating Ambient Temperature
Max Junction Temperature
Storage Temperature Range
Thermal Resistance, Junction−to−Air
ESD Protection
Latch up current at Ta = 85_C (Note 3)
Micro10
Human Body Model (HBM) (Note 1)
Machine Model (MM) (Note 2)
Symbol
V
p
O
p
V
p
V
in
I
out
P
d
T
A
T
J
T
stg
R
qJA
−
Value
6.0
2.2 to 5.5
−0.3 to V
CC
+ 0.3
250
Internally Limited
−40 to +85
150
−65 to +150
200
8000
200
±100
Unit
V
V
V
mA
−
°C
°C
°C
°C/W
V
mA
Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If stress
limits are exceeded device functional operation is not implied, damage may occur and reliability may be affected. Functional operation should be
restricted to the Recommended Operating Conditions.
1. Human Body Model, 100 pF discharged through a 1.5 kW resistor following specification JESD22/A114 8.0 kV can be applied on OUT_L,
OUT_R, REF_I and OUT_I outputs. For other pins, 2.0 kV is the specified voltage.
2. Machine Model, 200 pF discharged through all pins following specification JESD22/A115.
3. Maximum ratings per JEDEC standard JESD78.
*This device contains 752 active transistors and 1740 MOS gates.
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NCP2809 Series
ELECTRICAL CHARACTERISTICS
All the parameters are given in the capless configuration (typical application).
The following parameters are given for the NCP2809A and NCP2809B mounted externally with 0 dB gain, unless otherwise noted.
(For typical values T
A
= 25°C, for min and max values T
A
= −40°C to 85°C, T
Jmax
= 125°C, unless otherwise noted.)
Characteristic
Supply Quiescent Current
Symbol
I
DD
Conditions
V
in
= 0 V, R
L
= 16
W
V
p
= 2.4 V
V
p
= 5.0 V
V
p
= 2.4 V
V
p
= 5.0 V
V
p
= 5.0 V
−
−
C
by
= 1.0
mF
C
by
= 1.0
mF
and V
p
= 5.0 V
V
p
= 2.4 V, R
L
= 16
W
V
p
= 5.0 V, R
L
= 16
W
V
p
= 2.4 V, R
L
= 32
W
V
p
= 5.0 V, R
L
= 32
W
Max Rms Output Power
P
Orms
V
p
= 2.4 V, R
L
= 16
W,
THD+N<0.1%
V
p
= 5.0 V, R
L
= 16
W,
THD+N<0.1%
V
p
= 2.4 V, R
L
= 32
W,
THD+N<0.1%
V
p
= 5.0 V, R
L
= 32
W,
THD+N<0.1%
Voltage Gain
Crosstalk
G
CS
NCP2809A only
f = 1.0 kHz
V
p
= 2.4 V, R
L
= 16
W,
P
out
= 20 mW
V
p
= 2.4 V, R
L
= 32
W,
P
out
= 10 mW
V
p
= 3.0 V, R
L
= 16
W,
P
out
= 30 mW
V
p
= 3.0 V, R
L
= 32
W,
P
out
= 20 mW
V
p
= 5.0 V, R
L
= 16
W,
P
out
= 75 mW
V
p
= 5.0 V, R
L
= 32
W,
P
out
= 50 mW
Signal to Noise Ratio
SNR
f = 1.0 kHz
V
p
= 2.4 V, R
L
= 16
W,
P
out
= 20 mW
V
p
= 2.4 V, R
L
= 32
W,
P
out
= 10 mW
V
p
= 3.0 V, R
L
= 16
W,
P
out
= 30 mW
V
p
= 3.0 V, R
L
= 32
W,
P
out
= 20 mW
V
p
= 5.0 V, R
L
= 16
W,
P
out
= 75 mW
V
p
= 5.0 V, R
L
= 32
W,
P
out
= 50 mW
4. Min/Max limits are guaranteed by production test.
5. At T
A
= −40°C, the minimum value is set to 1.5 V.
6. See page 10 for a theoretical approach to these parameters.
−0.5
0.82
1.94
285
385
0.9
2.05
1.04
2.26
24
131
17
80
0
−63.5
−72.5
−64
−73
−64
−73
dB
88.3
89
90.5
92
95.1
96.1
+0.5
dB
dB
mW
1.2
0.4
−25
Min
(Note 4)
Typ
1.54
1.84
1.0
10
Max
(Note 4)
2.8
3.6
+25
600
mV
nA
V
V
ms
ms
V
Unit
mA
Output Offset Voltage
Shutdown Current
Shutdown Voltage High (Note 5)
Shutdown Voltage Low
Turning On Time (Note 6)
Turning Off Time (Note 6)
Max Output Swing
V
off
I
SD
V
SDIH
V
SDIL
T
WU
T
SD
V
loadpeak
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