NCP2823 Series
High Efficiency 3W
Filterless Class D Audio
Amplifier
The NCP2823A/B are cost effective mono audio power amplifiers
designed for portable electronic devices. NCP2823A is optimized for
8
W
operation and NCP2823B can operate with speaker impedance
down to 4.0
W.
For Instance, NCP2823B is capable of delivering 3 W
of continuous average power to a 4.0
W
from a 5.0 V supply in a
Bridge Tied Load (BTL) configuration. Under the same conditions,
NCP2823A can provide 1.5 W to an 8.0
W
BTL load with less than
10% THD+N. For cellular handsets or PDAs it offers space and cost
savings because no output filter is required when using inductive
transducers. With more than 90% efficiency and very low shutdown
current, it increases the lifetime of your battery and drastically lowers
the junction temperature.
NCP2823 processes analog inputs with a pulse width modulation
technique that lowers output noise and THD. The device allows
independent gain while summing signals from various audio sources.
Thus, in cellular handsets, the earpiece, the loudspeaker and even
melody ringer can be driven with a single NCP2823. Due to its low
26
mV
noise floor, A−weighted, clean listening is guaranteed no matter
the load sensitivity.
Features
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MARKING
DIAGRAM
9−PIN FLIP−CHIP CSP
FC SUFFIX
CASE 499AL
XXX
XXXG
AYWW
A1
= QTA for NCP2823A
= PMA for NCP2823B
= TPG for NCP2823A
with backside laminate
= Assembly Location
= Year
= Work Week
= Pb−Free Package
1
A
Y
WW
G
ORDERING INFORMATION
See detailed ordering and shipping information on page 10 of
this data sheet.
•
•
•
•
•
•
•
•
•
•
•
Optimized PWM Output Stage: Filterless Capability
Externally gain setting
Low consumption: 1.8 mA for NCP2823A
High efficiency: up to 92%
Large Output Power Capability:
3 W @ V
P
= 5.0 V, R
L
= 4
W,
THD+N < 10%
3 W @ V
P
= 5.5 V, R
L
= 4
W,
THD+N < 1%
High PSRR: up to
−77
dB
Fully Differential Capability: RF immunity
Thermal and Auto recovery Short−Circuit Protection
CMRR (−80 dB) Eliminates Two Input Coupling Capacitors
Pin to Pin compatible with NCP2820 Flip−Chip
These Devices are Pb−Free and are RoHS Compliant
1.45 mm
3.7 mm
Typical Applications
♦
♦
♦
♦
•
Audio Amplifier for
Cellular Phones
Digital Cameras
Personal Digital Assistant and Portable Media Player
GPS
©
Semiconductor Components Industries, LLC, 2011
January, 2011
−
Rev. 2
1
Publication Order Number:
NCP2823/D
NCP2823 Series
A1
INP
B1
AVDD
C1
INN
A2
A3
AGND VOUTN
B2
PVDD
C2
B3
PGND
C3
EN
VOUTP
(Top View)
Figure 1. Pin Description
BATTERY
Cs
V
DD
R
i
INN
R
f
RAMP
GENERATOR
Negative
Differential
Input
R
f
R
i
INP
300 kW
EN
V
ih
V
il
VOUTP
VOUTN
Positive
Differential
Input
Shutdown
Control
GND
Figure 2. Simplified Block Diagram
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2
R
L =
8
W
Data
Processor
CMOS
Output
Stage
NCP2823 Series
PIN FUNCTION DESCRIPTION
Pin
A1
C1
B2
B1
C3
A3
C2
B3
Pin
Name
INP
INN
PVDD
AVDD
VOUTP
VOUTN
EN
PGND
Type
INPUT
INPUT
POWER
POWER
OUTPUT
OUTPUT
INPUT
POWER
Positive Differential Input
Negative Differential Input
Power Supply: This pin is the power supply of the device. A 4.7
mF
ceramic capacitor or larger must
bypass this input to the ground. This capacitor should be placed as close a possible to this input.
Analog Power Supply: This pin must be connected to PVDD.
Positive output Special care must be observed at layout level. See the Layout recommendations.
Negative output: Special care must be observed at layout level. See the Layout recommendations.
Enable: When a High logic is applied to this pin, the device is activated
Power Ground: This pin is the power ground and carries the high switching current. A high quality
ground must be provided to avoid any noise spikes/uncontrolled operation. Care must be observed to
avoid high−density current flow in a limited PCB copper track.
Analog Ground: This pin is the analog ground of the device and must be connected to GND plane.
Description
A2
AGND
POWER
MAXIMUM RATINGS
Rating
AVDD, PVDD Pins: Power Supply Voltage (Note 2)
INP/N ,Pins: Input (Note 2)
Digital Input/Output: EN Pin:
Input Voltage
Input Current
Human Body Model (HBM) ESD Rating are (Note 3)
Machine Model (MM) ESD Rating are (Note 3)
WCSP 1.5 x 1.5 mm package (Notes 6 and 7)
Thermal Resistance Junction−to−Case
Operating Ambient Temperature Range
Operating Junction Temperature Range
Maximum Junction Temperature (Note 6)
Storage Temperature Range
Moisture Sensitivity (Note 5)
Symbol
V
P
V
INP/N
V
DG
I
DG
ESD HBM
ESD MM
R
qJC
T
A
T
J
T
JMAX
T
STG
MSL
Value
−0.3
to +6.0
−0.3
to +V
DD
−0.3
to V
DD
+0.3
1
2000
200
90
−40
to +85
−40
to +125
+150
−65
to +150
Level 1
Unit
V
V
V
mA
V
V
°C/W
°C
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Maximum electrical ratings are defined as those values beyond which damage to the device may occur at T
A
= 25°C.
2. According to JEDEC standard JESD22−A108B.
3. This device series contains ESD protection and passes the following tests:
Human Body Model (HBM) +/−2.0 kV per JEDEC standard: JESD22−A114 for all pins.
Machine Model (MM) +/−200 V per JEDEC standard: JESD22−A115 for all pins.
4. Latch up Current Maximum Rating:
$100
mA per JEDEC standard: JESD78 class II.
5. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J−STD−020A.
6. The thermal shutdown set to 150°C (typical) avoids irreversible damage on the device due to power dissipation.
7. The R
qCA
is dependent on the PCB heat dissipation. The maximum power dissipation (PD) is dependent on the min input voltage, the max
output current and external components selected.
R
qCA
+
125
*
T
A
P
D
*
R
qJC
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3
NCP2823 Series
ELECTRICAL CHARACTERISTICS
Min and Max Limits apply for T
A
between
−40°C
to +85°C and for V
DD
between 2.5 V to 5.5 V
(Unless otherwise noted). Typical values are referenced to T
A
= + 25
°C
and V
DD
= 3.6 V. (see Note 8)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
GENERAL PERFORMANCES
V
P
F
OSC
I
DD
Operational Power Supply
Oscillator Frequency
Supply current
NCP2823A
V
P
= 3.6 V, No Load
NCP2823B
V
P
= 3.6 V, No Load
V
ENL
= V
ENR
= 0 V
EN rising edge
EN falling edge
V
ENL
= 0 V
2.5
250
300
1.8
2.6
0.01
7.4
4
20
300
NCP2823A, V
P
= 3.6 V, Po = 600 mW, RL =
8
W,
F = 1 kHz
NCP2823B, V
P
= 3.6 V, Po = 1 W, RL = 4
W,
F = 1 kHz
Av
F
LP
T
SD
T
SDH
V
IH
V
IL
R
PLD
v
oo
PSRR
Voltage gain
−3
dB Cut off Frequency of
the Built in Low Pass Filter
Thermal Shut Down
Protection
Thermal Shut Down
Hysteresis
Rising Voltage Input Logic
High
Falling Voltage Input Logic
Low
Pull Down Resistor
1.2
285 kW
Ri
92
90
300 kW
Ri
30
150
10
−
−
250
V
DD
0.4
315 kW
Ri
V/V
kHz
°C
°C
V
V
kW
5.5
350
2.4
4.6
1
mA
ms
ms
kW
mW
%
V
kHz
mA
I
sd
T
ON
T
OFF
Z
sd
R
DS(ON)
h
Shutdown current
Turn ON Time
Turn Off Time
Class D Output impedance in
shutdown mode
Static drain−source on−state
resistance of power Mosfets
Efficiency
AUDIO PERFORMANCES
Output offset
Power supply rejection ratio
F = 217 Hz, Input ac grounded
F = 1 kHz, Input ac grounded
SNR
CMRR
Vn
Signal to noise ratio
Common mode rejection ratio
Output Voltage noise
V
P
= 5 V, Pout = 600 mW (A. Weighted)
Input shorted together
V
IC
= 1 V
pp
, f = 217 Hz
Input ac grounded, Av =
0 dB
No
weighting
A. Weighted
0.3
−77
−63
97
−80
35
26
dB
dB
mV
mV
dB
8. Performances guaranteed over the indicated operating temperature range by design and/or characterization, production tested at T
J
= T
A
= 25°C.
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4
NCP2823 Series
ELECTRICAL CHARACTERISTICS
Min and Max Limits apply for T
A
between
−40°C
to +85°C and for V
DD
between 2.5 V to 5.5 V
(Unless otherwise noted). Typical values are referenced to T
A
= + 25
°C
and V
DD
= 3.6 V. (see Note 8)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
AUDIO PERFORMANCES
Po
Output Power
NCP2823A
RL = 8
W
F = 1 kHz
THD+N
< 1%
V
P
= 5 V
V
P
= 3.6 V
V
P
= 2.5 V
THD+N
< 10%
V
P
= 5 V
V
P
= 3.6 V
V
P
= 2.5 V
NCP2823B
RL = 4
W
F = 1 kHz
THD+N
< 1%
V
P
= 5 V
V
P
= 3.6 V
V
P
= 2.5 V
THD+N
< 10%
V
P
= 5 V
V
P
= 3.6 V
V
P
= 2.5 V
THD+N
Total harmonic distortion plus
noise
V
P
= 3.6 V, Av = 6 dB, Po = 0.5 W
V
P
= 5 V, Av = 6 dB, Po = 1 W
1.5
0.7
0.22
1.8
0.87
0.4
1.72
1.2
0.58
3
1.57
0.71
0.1
0.08
%
W
8. Performances guaranteed over the indicated operating temperature range by design and/or characterization, production tested at T
J
= T
A
= 25°C.
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5
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