© Semiconductor Components Industries, LLC, 2007
September, 2007 - Rev. 6
1Publication Order Number:
NCP2820/D
NCP2820 Series
2.65 W Filterless Class-D
Audio Power Amplifier
The NCP2820 is a cost-effective mono Class-D audio power
amplifier capable of delivering 2.65 W of continuous average power
to 4.0 from a 5.0 V supply in a Bridge Tied Load (BTL)
configuration. Under the same conditions, the output power stage can
provide 1.4 W to a 8.0 BTL load with less than 1% THD+N. For
cellular handsets or PDAs it offers space and cost savings because no
output filter is required when using inductive tranducers. With more
than 90% efficiency and very low shutdown current, it increases the
lifetime of your battery and drastically lowers the junction
temperature.
The NCP2820 processes analog inputs with a pulse width
modulation technique that lowers output noise and THD when
compared to a conventional sigma-delta modulator. The device allows
independent gain while summing signals from various audio sources.
Thus, in cellular handsets, the earpiece, the loudspeaker and even the
melody ringer can be driven with a single NCP2820. Due to its low
42V noise floor, A-weighted, a clean listening is guaranteed no
matter the load sensitivity. With zero pop and click noise performance
NCP2820A turns on within 1 ms versus 9 ms for NCP2820 version.
Features
•Optimized PWM Output Stage: Filterless Capability
•Efficiency up to 90%
Low 2.5 mA Typical Quiescent Current
•Large Output Power Capability: 1.4 W with 8.0 Load (CSP) and
THD + N < 1%
•Ultra Fast Start-up Time: 1 ms for NCP2820A Version
•High Performance, THD+N of 0.03% @ Vp = 5.0 V,
RL = 8.0 , Pout = 100 mW
•Excellent PSRR (-65 dB): No Need for Voltage Regulation
•Surface Mounted Package 9-Pin Flip-Chip CSPand UDFN8
•Fully Differential Design. Eliminates Two Input Coupling Capacitors
•Very Fast Turn On/Off Times with Advanced Rising and Falling
Gain Technique
•External Gain Configuration Capability
•Internally Generated 250 kHz Switching Frequency
•“Pop and Click” Noise Protection Circuitry
•Pb-Free Packages are Available
Applications
•Cellular Phone
•Portable Electronic Devices
•PDAs and Smart Phones
•Portable Computer
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9-PIN FLIP-CHIP CSP
FC SUFFIX
CASE 499AL
MARKING
DIAGRAMS
ZB = Specific Device Code
M = Date Code
G= Pb-Free Package
OUTM
OUTP
Cs
GND
Ri
SD
INP
INM
VP
Input from
Microcontroller
Audio
Input
from
DAC
3.7 mm
1.6 mm
Cs
Ri
Ri
Ri
See detailed ordering and shipping information on page 20 of
this data sheet.
ORDERING INFORMATION
8 PIN UDFN 2x2.2
MU SUFFIX
CASE 506AV
ZB MG
1
MxxG
AYWW
A1 A3
C1
1
1
8
xx = AQ for NCP2820
= BD for NCP2820A
A = Assembly Location
Y = Year
WW = Work Week
G= Pb-Free Package
NCP2820 Series
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2
PIN CONNECTIONS
9-Pin Flip-Chip CSP
A3
B3
C3
A2
B2
C2
A1
B1
C1
GNDINP OUTM
VP
SD OUTP
GND
INM
VP
(Top View)
1
2
3
4
8
7
6
5
GND
INP
OUTM
VP
SD
OUTP
INM
VP
UDFN8
(Top View)
Data
Processor
GND
OUTP
Figure 1. Typical Application
OUTM
Rf
Ri
Positive
Differential
Input
INP
Rf
Ri
Negative
Differential
Input
INM
RL = 8
Shutdown
Control
SD
Vp
Cs
RAMP
GENERATOR
BATTERY
300 k
Vih
Vil
CMOS
Output
Stage
PIN DESCRIPTION
Pin No.
Symbol Type Description
CSP UDFN8
A1 3 INP I Positive Differential Input.
A2 7 GND I Analog Ground.
A3 8 OUTM O Negative BTL Output.
B1 2 VpIAnalog Positive Supply. Range: 2.5 V – 5.5 V.
B2 6 VpIPower Analog Positive Supply. Range: 2.5 V – 5.5 V.
B3 7 GND I Analog Ground.
C1 4 INM I Negative Differential Input.
C2 1 SD I The device enters in Shutdown Mode when a low level is applied on this pin. An internal
300 k resistor will force the device in shutdown mode if no signal is applied to this pin. It
also helps to save space and cost.
C3 5 OUTP O Positive BTL Output.
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3
MAXIMUM RATINGS
Symbol Rating Max Unit
VpSupply Voltage Active Mode
Shutdown Mode
6.0
7.0
V
Vin Input Voltage -0.3 to VCC +0.3 V
Iout Max Output Current (Note 1) 1.5 A
PdPower Dissipation (Note 2) Internally Limited -
TAOperating Ambient Temperature -40 to +85 °C
TJMax Junction Temperature 150 °C
Tstg Storage Temperature Range -65 to +150 °C
RJA Thermal Resistance Junction-to-Air 9-Pin Flip-Chip
UDFN8
90 (Note 3)
50
°C/W
-
-
ESD Protection
Human Body Model (HBM) (Note 4)
Machine Model (MM) (Note 5)
> 2000
> 200
V
-Latchup Current @ TA = 85°C (Note 6) 9-Pin Flip-Chip
UDFN8
$70
$100
mA
MSL Moisture Sensitivity (Note 7) Level 1
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. The device is protected by a current breaker structure. See “Current Breaker Circuit” in the Description Information section for more
information.
2. The thermal shutdown is set to 160°C (typical) avoiding irreversible damage to the device due to power dissipation.
3. For the 9-Pin Flip-Chip CSP package, the RJA is highly dependent of the PCB Heatsink area. For example, RJA can equal 195°C/W with
50 mm2 total area and also 135°C/W with 500 mm2. When using ground and power planes, the value is around 90°C/W, as specified in table.
4. Human Body Model: 100 pF discharged through a 1.5 k resistor following specification JESD22/A114. On 9-Pin Flip-Chip, B2 Pin (VP)
is qualified at 1500 V.
5. Machine Model: 200 pF discharged through all pins following specification JESD22/A115.
6. Latchup Testing per JEDEC Standard JESD78.
7. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J-STD-020A.
NCP2820 Series
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4
ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G)
Characteristic Symbol Conditions Min Typ Max Unit
Operating Supply Voltage VpTA = -40°C to +85°C 2.5 - 5.5 V
Supply Quiescent Current Idd Vp = 3.6 V, RL = 8.0
Vp = 5.5 V, No Load
Vp from 2.5 V to 5.5 V, No Load
TA = -40°C to +85°C
-
-
-
2.15
2.61
-
-
-
4.6
mA
Shutdown Current Isd Vp = 4.2 V
TA = +25°C
TA = +85°C
-
-
0.42
0.45
0.8
-
A
Vp = 5.5 V
TA = +25°C
TA = +85°C
-
-
0.8
0.9
1.5
-
A
Shutdown Voltage High Vsdih 1.2 - - V
Shutdown Voltage Low Vsdil - - 0.4 V
Switching Frequency Fsw Vp from 2.5 V to 5.5 V
TA = -40°C to +85°C
190 250 310 kHz
Gain G RL = 8.0 285 k
Ri
300 k
Ri
315 k
Ri
V
V
Output Impedance in Shutdown Mode ZSD - 300 -
Resistance from SD to GND Rs - - 300 - k
Output Offset Voltage Vos Vp = 5.5 V - 6.0 - mV
Turn On Time NCP2820
NCP2820A
Ton Vp from 2.5 V to 5.5 V -
-
9.0
1.0
-
3.0
ms
Turn Off Time NCP2820
NCP2820A
Toff Vp from 2.5 V to 5.5 V -
-
5.0
0.5
-
-
ms
Thermal Shutdown Temperature Tsd - - 160 - °C
Output Noise Voltage Vn Vp = 3.6 V, f = 20 Hz to 20 kHz
no weighting filter
with A weighting filter
-
-
65
42
-
-
Vrms
RMS Output Power Po RL = 8.0 , f = 1.0 kHz, THD+N < 1%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
-
-
-
-
-
0.32
0.48
0.7
0.97
1.38
-
-
-
-
-
W
RL = 8.0 , f = 1.0 kHz, THD+N < 10%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
-
-
-
-
-
0.4
0.59
0.87
1.19
1.7
-
-
-
-
-
W
RL = 4.0 , f = 1.0 kHz, THD+N < 1%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
-
-
-
-
-
0.49
0.72
1.06
1.62
2.12
-
-
-
-
-
W
RL = 4.0 , f = 1.0 kHz, THD+N < 10%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
-
-
-
-
-
0.6
0.9
1.33
2.0
2.63
-
-
-
-
-
W
NCP2820 Series
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ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G)
Characteristic UnitMaxTypMinConditionsSymbol
Efficiency - RL = 8.0 , f = 1.0 kHz
Vp = 5.0 V, Pout = 1.2 W
Vp = 3.6 V, Pout = 0.6 W
-
-
91
90
-
-
%
RL = 4.0 , f = 1.0 kHz
Vp = 5.0 V, Pout = 2.0 W
Vp = 3.6 V, Pout = 1.0 W
-
-
82
81
-
-
Total Harmonic Distortion + Noise THD+N Vp = 5.0 V, RL = 8.0 ,
f = 1.0 kHz, Pout = 0.25 W
Vp = 3.6 V, RL = 8.0 ,
f = 1.0 kHz, Pout = 0.25 W
-
-
0.05
0.09
-
-
%
Common Mode Rejection Ratio CMRR Vp from 2.5 V to 5.5 V
Vic = 0.5 V to Vp - 0.8 V
Vp = 3.6 V, Vic = 1.0 Vpp
f = 217 Hz
f = 1.0 kHz
-
-
-
-62
-56
-57
-
-
-
dB
Power Supply Rejection Ratio PSRR Vp_ripple_pk-pk = 200 mV, RL = 8.0 ,
Inputs AC Grounded
Vp = 3.6 V
f = 217 kHz
f = 1.0 kHz
-
-
-62
-65
-
-
dB
ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820MUTBG)
Characteristic Symbol Conditions Min Typ Max Unit
Operating Supply Voltage VpTA = -40°C to +85°C 2.5 - 5.5 V
Supply Quiescent Current Idd Vp = 3.6 V, RL = 8.0
Vp = 5.5 V, No Load
Vp from 2.5 V to 5.5 V, No Load
TA = -40°C to +85°C
-
-
-
2.15
2.61
-
-
-
3.8
mA
Shutdown Current Isd Vp = 4.2 V
TA = +25°C
TA = +85°C
-
-
0.42
0.45
0.8
2.0
A
Vp = 5.5 V
TA = +25°C
TA = +85°C
-
-
0.8
0.9
1.5
-
A
Shutdown Voltage High Vsdih 1.2 - - V
Shutdown Voltage Low Vsdil - - 0.4 V
Switching Frequency Fsw Vp from 2.5 V to 5.5 V
TA = -40°C to +85°C
180 240 300 kHz
Gain G RL = 8.0 285 k
Ri
300 k
Ri
315 k
Ri
V
V
Output Impedance in Shutdown Mode ZSD - 20 - k
Resistance from SD to GND Rs - - 300 - k
Output Offset Voltage Vos Vp = 5.5 V - 6.0 - mV
Turn On Time Ton Vp from 2.5 V to 5.5 V - 1.0 - s
Turn Off Time Toff Vp from 2.5 V to 5.5 V - 1.0 - s
Thermal Shutdown Temperature Tsd - - 160 - °C
Output Noise Voltage Vn Vp = 3.6 V, f = 20 Hz to 20 kHz
no weighting filter
with A weighting filter
-
-
65
42
-
-
Vrms
NCP2820 Series
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ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820MUTBG)
Characteristic UnitMaxTypMinConditionsSymbol
RMS Output Power Po RL = 8.0 , f = 1.0 kHz, THD+N < 1%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
-
-
-
-
-
0.22
0.33
0.45
0.67
0.92
-
-
-
-
-
W
RL = 8.0 , f = 1.0 kHz, THD+N < 10%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
-
-
-
-
-
0.36
0.53
0.76
1.07
1.49
-
-
-
-
-
W
RL = 4.0 , f = 1.0 kHz, THD+N < 1%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
-
-
-
-
-
0.24
0.38
0.57
0.83
1.2
-
-
-
-
-
W
RL = 4.0 , f = 1.0 kHz, THD+N < 10%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
-
-
-
-
-
0.52
0.8
1.125
1.58
2.19
-
-
-
-
-
W
Efficiency - RL = 8.0 , f = 1.0 kHz
Vp = 5.0 V, Pout = 1.2 W
Vp = 3.6 V, Pout = 0.6 W
-
-
87
87
-
-
%
RL = 4.0 , f = 1.0 kHz
Vp = 5.0 V, Pout = 2.0 W
Vp = 3.6 V, Pout = 1.0 W
-
-
79
78
-
-
Total Harmonic Distortion + Noise THD+N Vp = 5.0 V, RL = 8.0 ,
f = 1.0 kHz, Pout = 0.25 W
Vp = 3.6 V, RL = 8.0 ,
f = 1.0 kHz, Pout = 0.25 W
-
-
0.05
0.06
-
-
%
Common Mode Rejection Ratio CMRR Vp from 2.5 V to 5.5 V
Vic = 0.5 V to Vp - 0.8 V
Vp = 3.6 V, Vic = 1.0 Vpp
f = 217 Hz
f = 1.0 kHz
-
-
-
-62
-56
-57
-
-
-
dB
Power Supply Rejection Ratio PSRR Vp_ripple_pk-pk = 200 mV, RL = 8.0 ,
Inputs AC Grounded
Vp = 3.6 V
f = 217 kHz
f = 1.0 kHz
-
-
-62
-65
-
-
dB
NCP2820 Series
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7
Figure 2. Test Setup for Graphs
OUTM
OUTP
GND
Ri
INP
INM
VP
Ri
Ci
Ci
+
-
+
-
4.7 F
+
-
Audio Input
Signal Load
30 kHz
Low Pass
Filter
Measurement
Input
Power
Supply
NCP2820
NOTES:
1. Unless otherwise noted, Ci = 100 nF and Ri= 150 k. Thus, the gain setting is 2 V/V and the cutoff frequency of the
input high pass filter is set to 10 Hz. Input capacitors are shorted for CMRR measurements.
2. To closely reproduce a real application case, all measurements are performed using the following loads:
RL = 8 means Load = 15 H + 8 + 15 H
RL = 4 means Load = 15 H + 4 + 15 H
Very low DCR 15 H inductors (50 m) have been used for the following graphs. Thus, the electrical load
measurements are performed on the resistor (8 or 4 ) in differential mode.
3. For Efficiency measurements, the optional 30 kHz filter is used. An RC low-pass filter is selected with
(100 , 47 nF) on each PWM output.
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8
TYPICAL CHARACTERISTICS
EFFICIENCY %
Pout (W)
DIE TEMPERATURE (°C)
Pout (W)
60
0 0.1 0.2
DIE TEMPERATURE (°C)
Pout (W)
Vp = 3.6 V
RL = 8
NCP2820
Class AB
0.3 0.4
55
50
45
40
35
30
25
20
20
30
40
50
60
70
80
90
100
0 0.2 0.4
DIE TEMPERATURE (°C)
Pout (W)
Vp = 5 V
RL = 8
NCP2820
Class AB
Figure 3. Efficiency vs. Pout
Vp = 5 V, RL = 8 , f = 1 kHz
Figure 4. Die Temperature vs. Pout
Vp = 5 V, RL = 8 , f = 1 kHz @ TA = +25°C
Figure 5. Efficiency vs. P out
Vp = 3.6 V, RL = 8 , f = 1 kHz
Figure 6. Efficiency vs. Pout
V
p
= 5 V, RL = 4 , f = 1 kHz
EFFICIENCY (%)
Pout (W)
Vp = 3.6 V
RL = 8
Class AB
EFFICIENCY (%)
Pout (W)
Vp = 5 V
RL = 8
NCP2820 DFN
Class AB
0.6 0.8 1.0 1.2 1.4
0.5 0.6 0.7
Vp = 5 V
RL = 4
Class AB
0
10
20
30
40
50
60
70
80
100
0 0.2 0.4 0.6 0.8 1
90 NCP2820 CSP
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
NCP2820 DFN
NCP2820 CSP
Figure 7. Die Temperature vs. Pout
V
p
= 5 V, RL = 4 , f = 1 kHz @ TA = +25°C
0
10
20
30
40
50
60
70
80
90
0 0.5 1 1.5 2
NCP2820 DFN
NCP2820 CSP
160
0 0.5 1.0
Vp = 5 V
RL = 4
NCP2820
Class AB
1.5 2.0
140
120
100
80
60
40
20
Figure 8. Die Temperature vs. P out
Vp = 3.6 V, RL = 8 , f = 1 kHz @ TA = +25°C
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TYPICAL CHARACTERISTICS
0.01
0.1
1.0
10
0 0.1 0.2 0.3 0.4 0.5 0.6
THD+N (%)
Pout (W)
Vp = 3 V
RL = 8
f = 1 kHz
0.01
0.1
1.0
10
0 0.2 0.4 0.6 0.8 1.0 1.2
THD+N (%)
Pout (W)
Vp = 4.2 V
RL = 8
f = 1 kHz
EFFICIENCY %
Pout (W)
Vp = 3.6 V
RL = 4
Class AB
100
0 0.2 0.4
DIE TEMPERATURE (°C)
Pout (W)
0.6 0.8
90
80
70
60
50
40
30
20
1.0
Vp = 3.6 V
RL = 4
NCP2820
Class AB
Figure 9. Efficiency vs. Pout
Vp = 3.6 V, RL = 4 , f = 1 kHz
Figure 10. Die Temperature vs. Pout
Vp = 3.6 V, RL = 4 , f = 1 kHz @ TA = +25°C
Figure 11. THD+N vs. Pout
Vp = 5 V, RL = 8 , f = 1 kHz
0.01
0.1
1.0
10
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Figure 12. THD+N vs. Pout
Vp = 4.2 V, RL = 8 , f = 1 kHz
Figure 13. THD+N vs. Pout
V
p
= 3.6 V, RL = 8 , f = 1 kHz
Figure 14. THD+N vs. Pout
Vp = 3 V, RL = 8 , f = 1 kHz
THD+N (%)
Pout (W)
Vp = 5.0 V
RL = 8
f = 1 kHz
0.01
0.1
1.0
10
0 0.2 0.4 0.6 0.8
THD+N (%)
Pout (W)
Vp = 3.6 V
RL = 8
f = 1 kHz
0
10
20
30
40
50
60
70
80
90
0 0.2 0.4 0.6 0.8 1 1.2
NCP2820 DFN
NCP2820 CSP
NCP2820 DFN
NCP2820 CSP
NCP2820 DFN
NCP2820 CSP
NCP2820 DFN
NCP2820 CSP
NCP2820 DFN
NCP2820 CSP
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TYPICAL CHARACTERISTICS
0.1
1.0
10
00.1 0.2 0.3 0.4
THD+N (%)
Pout (W)
Vp = 2.5 V
RL = 4
f = 1 kHz
0.5 0.6
0.1
1.0
10
00.2 0.4 0.6 0.8
THD+N (%)
Pout (W)
Vp = 3 V
RL = 4
f = 1 kHz
10
0 0.5 1.0
THD+N (%)
Pout (W)
1.5 2.0
1.0
0.1
0.01 2.5
Vp = 5 V
RL = 4
f = 1 kHz
Figure 15. THD+N vs. Pout
Vp = 2.5 V, RL = 8 , f = 1 kHz
Figure 16. THD+N vs. Pout
Vp = 5 V, RL = 4 , f = 1 kHz
Figure 17. THD+N vs. Pout
Vp = 4.2 V, RL = 4 , f = 1 kHz
Figure 18. THD+N vs. Pout
Vp = 3.6 V, RL = 4 , f = 1 kHz
Figure 19. THD+N vs. Power Out
V
p
= 3 V, RL = 4 , f = 1 kHz
Figure 20. THD+N vs. Power Out
Vp = 2.5 V, RL = 4 , f = 1 kHz
0.01
0.1
1.0
10
0 0.1 0.2 0.3 0.4
THD+N (%)
Pout (W)
Vp = 2.5 V
RL = 8
f = 1 kHz
0.01
0.1
1.0
10
0 0.5 1.0 1.5 2.0
THD+N (%)
Pout (W)
Vp = 4.2 V
RL = 4
f = 1 kHz
0.01
0.1
1.0
10
0 0.4 0.8 1.2 1.4
THD+N (%)
Pout (W)
Vp = 3.6 V
RL = 4
f = 1 kHz
0.2 0.6 1.0
1.0
NCP2820 DFN
NCP2820 CSP
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TYPICAL CHARACTERISTICS
10
-20
100 1000 10000 10000
0
FREQUENCY (Hz)
PSSR (dB)
Inputs to GND
RL = 4
Vp = 3.6 V
Vp = 5 V
-30
-40
-50
-60
-70
-80
10
-20
100 1000 10000 100000
FREQUENCY (Hz)
PSSR (dB)
Inputs to GND
RL = 8
Vp = 3.6 V
Vp = 5 V
-30
-40
-50
-60
-70
-80
10
0.01
0.1
1.0
10
100 1000 10000 100000
FREQUENCY (Hz)
THD+N (%)
Vp = 2.5 V
Vp = 5 V
10
POWER SUPPLY (V)
Figure 21. Output Power vs. Power Supply
RL = 8 @ f = 1 kHz
Figure 22. Output Power vs. Power Supply
RL = 4 @ f = 1 kHz
0.01
0.1
1.0
10
100 1000 10000 100000
Figure 23. THD+N vs. Frequency
RL = 8 , Pout = 250 mW @ f = 1 kHz
Figure 24. THD+N vs. Frequency
RL = 4 , Pout = 250 mW @ f = 1 kHz
Figure 25. PSRR vs. Frequency
Inputs Grounded, RL = 8 , Vripple = 200 mvpkpk
Figure 26. PSRR vs. Frequency
Inputs grounded, RL = 4 , Vripple = 200 mVpkpk
0
0.5
1.0
1.5
2.0
2.5 3.0 3.5 4.0
Pout (W)
4.5 5.0
THD+N = 10%
RL = 8
f = 1 kHz
POWER SUPPLY (V)
0
0.5
1.0
1.5
2.0
2.5 3.0 3.5 4.0
Pout (W)
4.5
THD+N = 10%
THD+N = 1%
2.5
3.0
RL = 4
f = 1 kHz
FREQUENCY (Hz)
THD+N (%)
Vp = 2.5 V
Vp = 3.6 V
Vp = 5 V
Vp = 3.6 V
5.0
NCP2820 DFN
NCP2820 CSP
THD+N = 10%
NCP2820 CSP
THD+N = 1%
NCP2820 DFN
THD+N = 3%
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TYPICAL CHARACTERISTICS
10
10
100
1000
100 1000 1000
0
FREQUENCY (Hz)
NOISE (Vrms)
Vp = 5 V
RL = 8
No Weighting
With A Weighting
10
10
100
1000
100 1000 10000
FREQUENCY (Hz)
NOISE (Vrms)
Vp = 3.6 V
RL = 8
No Weighting
With A Weighting
2.5
2.8
3.5 4.5 5.5
POWER SUPPLY (V)
SHUTDOWN CURRENT (nA)
RL = 8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
2.5
900
3.5 4.5 5.5
POWER SUPPLY (V)
SHUTDOWN CURRENT (nA)
RL = 8
800
700
600
500
400
300
200
100
0
120
3.5
130 140 150 160
TEMPERATURE (°C)
QUIESCENT CURRENT (mA)
Thermal Shutdown
Vp = 3.6 V
RL = 8
3.0
2.5
2.0
1.5
1.0
0.5
0
10
-20
100 1000 10000 100000
FREQUENCY (Hz)
CMMR (dB)
Vp = 3.6 V
RL = 8
-30
-40
-50
-60
-70
-80
Figure 27. PSRR vs. Frequency
Vp = 3.6 V, RL = 8 , Vic = 200 mvpkpk
Figure 28. Thermal Shutdown vs. Temperature
Vp = 5 V, RL = 8 ,
Figure 29. Shutdown Current vs. Power Supply
RL = 8
Figure 30. Quiescent Current vs. Power Supply
RL = 8
Figure 31. Noise Floor, Inputs AC Grounded
with 1 F V
p
= 3.6 V
Figure 32. Noise Floor, Inputs AC Grounded
with 1 F V
p
= 5 V
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8
2.5 3.5 4.5 5.5
POWER SUPPLY (V)
TURN OFF TIME (mS)
TA = +85°C
6
7
8
9
10
11
2.5 3.5 4.5 5.5
Figure 33. Turn on Time Figure 34. Turn off Time
POWER SUPPLY (V)
TURN ON TIME (mS)
TA = +85°C
TA = +25°C
TA = -40°C
7
6
5
4
TA = -40°C
TA = +25°C
DESCRIPTION INFORMATION
Detailed Description
The basic structure of the NCP2820 is composed of one
analog pre-amplifier, a pulse width modulator and an
H-bridge CMOS power stage. The first stage is externally
configurable with gain-setting resistor Ri and the internal
fixed feedback resistor Rf (the closed-loop gain is fixed by
the ratios of these resistors) and the other stage is fixed. The
load is driven differentially through two output stages.
The differential PWM output signal is a digital image of
the analog audio input signal. The human ear is a band pass
filter regarding acoustic waveforms, the typical values of
which are 20 Hz and 20 kHz. Thus, the user will hear only
the amplified audio input signal within the frequency range.
The switching frequency and its harmonics are fully filtered.
The inductive parasitic element of the loudspeaker helps to
guarantee a superior distortion value.
Power Amplifier
The output PMOS and NMOS transistors of the amplifier
have been designed to deliver the output power of the
specifications without clipping. The channel resistance
(Ron) of the NMOS and PMOS transistors is typically 0.4.
Turn On and Turn Off Transitions in the 9 Pin
Flip-Chip Package (NCP2820)
In order to eliminate “pop and click” noises during
transition, the output power in the load must not be
established or cutoff suddenly. When a logic high is applied
to the shutdown pin, the internal biasing voltage rises
quickly and, 4 ms later, once the output DC level is around
the common mode voltage, the gain is established slowly
(5.0 ms). This method to turn on the device is optimized in
terms of rejection of “pop and click” noises. Thus, the total
turn on time to get full power to the load is 9 ms (typical).
The device has the same behavior when it is turned-off by
a logic low on the shutdown pin. No power is delivered to the
load 5 ms after a falling edge on the shutdown pin. Due to
the fast turn on and off times, the shutdown signal can be
used as a mute signal as well.
Turn On and Turn Off Transitions in the 9 Pin
Flip-Chip Package (NCP2820)
In the case of the NCP2820A, the sequences are the same
as the NCP2820. Only the timing is different with 1 ms for
the turn on and 500 s for the turn off sequence.
Turn On and Turn Off Transitions in the UDFN8
In the case of the UDFN8 package, the audio signal is
established instantaneously after the rising edge on the
shutdown pin. The audio is also suddenly cut once a low
level is sent to the amplifier. This way to turn on and off the
device in a very fast way also prevents from “pop & click”
noise.
Shutdown Function
The device enters shutdown mode when the shutdown
signal is low. During the shutdown mode, the DC quiescent
current of the circuit does not exceed 1.5 A.
Current Breaker Circuit
The maximum output power of the circuit corresponds to
an average current in the load of 820 mA.
In order to limit the excessive power dissipation in the
load if a short-circuit occurs, a current breaker cell shuts
down the output stage. The current in the four output MOS
transistors are real-time controlled, and if one current
exceeds the threshold set to 1.5 A, the MOS transistor is
opened and the current is reduced to zero. As soon as the
short-circuit is removed, the circuit is able to deliver the
expected output power.
This patented structure protects the NCP2820. Since it
completely turns off the load, it minimizes the risk of the
chip overheating which could occur if a soft current limiting
circuit was used.
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APPLICATION INFORMATION
NCP2820 PWM Modulation Scheme
The NCP2820 uses a PWM modulation scheme with each
output switching from 0 to the supply voltage. If Vin = 0 V
outputs OUTM and OUTP are in phase and no current is
flowing through the differential load. When a positive signal
is applied, OUTP duty cycle is greater than 50% and OUTM
is less than 50%. With this configuration, the current through
the load is 0 A most of the switching period and thus power
losses in the load are lowered.
Figure 35. Output Voltage and Current Waveforms into an Inductive Loudspeaker
DC Output Positive Voltage Configuration
OUTP
OUTM
Load Current
+Vp
0 V
-Vp
0 A
Voltage Gain
The first stage is an analog amplifier. The second stage is
a comparator: the output of the first stage is compared with
a periodic ramp signal. The output comparator gives a pulse
width modulation signal (PWM). The third and last stage is
the direct conversion of the PWM signal with MOS
transistors H-bridge into a powerful output signal with low
impedance capability.
With an 8 load, the total gain of the device is typically
set to:
300k
Ri
Input Capacitor Selection (Cin)
The input coupling capacitor blocks the DC voltage at the
amplifier input terminal. This capacitor creates a high-pass
filter with Rin, the cut-off frequency is given by
Fc +1
2 Ri Ci .
When using an input resistor set to 150 k, the gain
configuration is 2 V/V. In such a case, the input capacitor
selection can be from 10 nF to 1 F with cutoff frequency
values between 1 Hz and 100 Hz. The NCP2820 also
includes a built in low pass filtering function. It's cut off
frequency is set to 20 kHz.
Optional Output Filter
This filter is optional due to the capability of the speaker
to filter by itself the high frequency signal. Nevertheless, the
high frequency is not audible and filtered by the human ear.
An optional filter can be used for filtering high frequency
signal before the speaker. In this case, the circuit consists of
two inductors (15 H) and two capacitors (2.2 F)
(Figure 36). The size of the inductors is linked to the output
power requested by the application. A simplified version of
this filter requires a 1 F capacitor in parallel with the load,
instead of two 2.2 F connected to ground (Figure 37).
Cellular phones and portable electronic devices are great
applications for Filterless Class-D as the track length
between the amplifier and the speaker is short, thus, there is
usually no need for an EMI filter. However, to lower radiated
emissions as much as possible when used in filterless mode,
a ferrite filter can often be used. Select a ferrite bead with the
high impedance around 100 MHz and a very low DCR value
in the audio frequency range is the best choice. The
MPZ1608S221A1 from TDK is a good choice. The package
size is 0603.
Optimum Equivalent Capacitance at Output Stage
If the optional filter described in the above section isn't
selected. Cellular phones and wireless portable devices
design normally put several Radio Frequency filtering
capacitors and ESD protection devices between Filter less
Class D outputs and loudspeaker. Those devices are usually
connected between amplifier output and ground. In order to
achieve the best sound quality, the optimum value of total
equivalent capacitance between each output terminal to the
ground should be less than or equal to 150 pF. This total
equivalent capacitance consists of the radio frequency
filtering capacitors and ESD protection device equivalent
parasitic capacitance.
NCP2820 Series
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15
OUTM
OUTP
RL = 8
2.2 F
2.2 F
15 H
15 H
OUTM
OUTP
RL = 8
1.0 F
15 H
15 H
Figure 36. Advanced Optional Audio Output Filter Figure 37. Optional Audio Output Filter
OUTM
OUTP
RL = 8
Figure 38. Optional EMI Ferrite Bead Filter
FERRITE
CHIP BEADS
Figure 39. NCP2820 Application Schematic with Fully Differential Input Configuration
Figure 40. NCP2820 Application Schematic with Fully Differential Input Configuration and
Ferrite Chip Beads as an Output EMI Filter
OUTM
OUTP
Cs
GND
Ri
SD
INP
INM
VP
Input from
Microcontroller
Differential
Audio Input
from DAC Ri
OUTM
OUTP
Cs
GND
Ri
SD
INP
INM
VP
Input from
Microcontroller
Differential
Audio Input
from DAC Ri
FERRITE
CHIP BEADS
NCP2820 Series
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16
Figure 41. NCP2820 Application Schematic with Differential Input Configuration and
High Pass Filtering Function
OUTM
OUTP
Cs
GND
Ri
SD
INP
INM
VP
Input from
Microcontroller
Differential
Audio Input
from DAC Ri
FERRITE
CHIP BEADS
Ci
Ci
OUTM
OUTP
Cs
GND
Ri
SD
INP
INM
VP
Input from
Microcontroller
Single-Ended Audio Input
from DAC
Ri
Ci
Ci
Figure 42. NCP2820 Application Schematic with Single Ended Input Configuration
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Figure 43. Schematic of the Demonstration Board of the 9-pin Flip Chip CSP Device
J7
C1
100 nF
J8
C2
100 nF
J2
R1
150 k
R2
150 k
U1
J1
Vp
Vp
C4*
4.7 F
C3*
B1, B2
A2, B3
OUTM
OUTP
RL = 8
GND
J4
J5
J5
J3
J6*
Vp
CL = NCP2820 ON
CL = NCP2820 OFF
SD C2
Data
Processor
Rf
INM
Rf
INP
Shutdown
Control
RAMP
GENERATOR
300 k
CMOS
Output
Stage
A3
C3
A1
C1
*J6 not Mounted
*C3 not Mounted in case of 9 Pin Flip-Chip Evaluation Board
*C4 not Defined in case of UDFN8 Evaluation Board.
Figure 44. Silkscreen Layer of the 9 Pin Flip-Chip Evaluation Board
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Figure 45. Silkscreen Layer of the UDFN8 Evaluation Board
PCB Layout Information
NCP2820 is suitable for low cost solution. In a very small
package it gives all the advantages of a Class-D audio
amplifier. The required application board is focused on low
cost solution too. Due to its fully differential capability, the
audio signal can only be provided by an input resistor. If a
low pass filtering function is required, then an input
coupling capacitor is needed. The values of these
components determine the voltage gain and the bandwidth
frequency. The battery positive supply voltage requires a
good decoupling capacitor versus the expected distortion.
When the board is using Ground and Power planes with
at least 4 layers, a single 4.7 F filtering ceramic capacitor
on the bottom face will give optimized performance.
A 1.0 F low ESR ceramic capacitor can also be used with
slightly degraded performances on the THD+N from 0.06%
up to 0.2%.
In a two layers application, if both Vp pins are connected
on the top layer, a single 4.7 F decoupling capacitor will
optimize the THD+N level.
The NCP2820 power audio amplifier can operate from
2.5 V until 5.5 V power supply. With less than 2% THD+N,
it delivers 500 mW rms output power to a 8.0 load at
Vp =3.0 V and 1.0 W rms output power at Vp = 4.0 V.
NCP2820 Series
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Figure 46. Top Layer of Two Layers Board Dedicated to the 9-Pin Flip-Chip Package
Note: This track between Vp pins is only needed when a 2 layers board is used. In case of a typical
4 or more layers, the use of laser vias in pad will optimize the THD+N floor. The demonstration
board delivered by ON Semiconductor is a 4 Layers with Top, Ground, Power Supply and Bottom.
Note
Bill of Materials
Item Part Description Ref
PCB
Footprint Manufacturer Part Number
1NCP2820 Audio Amplifier U1 NCP2820
2SMD Resistor 150 kR1, R2 0603 Vishay-Draloric CRCW0603
3Ceramic Capacitor 100 nF, 50 V, X7R C1, C2 0603 TDK C1608X7R1H104KT
4Ceramic Capacitor 4.7 F, 6.3 V, X5R C3, C4 0603 TDK C1608X5R0J475MT
5PCB Footprint J7, J8
6I/O connector. It can be plugged by
MC-1,5/3-ST-3,81
J2 Phoenix Contact MC-1,5/3-G
7I/O connector. It can be plugged by
BLZ5.08/2 (Weidmuller Reference)
J1, J3 Weidmuller SL5.08/2/90B
8Jumper Connector, 400 mils J4 Harwin D3082-B01
9Jumper Header Vertical Mount
3*1, 2.54 mm.
J5 Tyco Electronics / AMP 5-826629-0
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ORDERING INFORMATION
Device Marking Package Shipping†
NCP2820FCT1 MAQ 9-Pin Flip-Chip CSP 3000 / Tape & Reel
NCP2820FCT1G MAQG9-Pin Flip-Chip CSP
(Pb-Free)
3000 / Tape & Reel
T1 Orientation
NCP2820FCT2G MAQG9-Pin Flip-Chip CSP
(Pb-Free)
3000 / Tape & Reel
T2 Orientation
NCP2820AFCT2G MBDG9-Pin Flip-Chip CSP
(Pb-Free)
3000 / Tape & Reel
T2 Orientation
NCP2820MUTBG ZBMG8 PIN UDFN 2x2.2
(Pb-Free)
3000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
Die orientation in tape with bumps downDie orientation in tape with bumps down
Pin 1 (Upper Right) Pin 1 (Upper Left)
T1 Orientation T2 Orientation
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PACKAGE DIMENSIONS
9 PIN FLIP-CHIP
CASE 499AL-01
ISSUE O
DIM MIN MAX
MILLIMETERS
A0.540 0.660
A1 0.210 0.270
A2
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. COPLANARITY APPLIES TO SPHERICAL
CROWNS OF SOLDER BALLS.
E
D
-A-
-B-
0.10 C
A2
A
A1
-C-
0.05 C
0.10 C
4 X
SEATING
PLANE
D1
e
E1
e
0.05 C
0.03 C
A B
9 X b
C
B
A
12 3
D1.450 BSC
E
0.330 0.390
b0.290 0.340
e0.500 BSC
D1 1.000 BSC
E1 1.000 BSC
1.450 BSC
SIDE VIEW
TOP VIEW
BOTTOM VIEW
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PACKAGE DIMENSIONS
8 PIN UDFN, 2x2.2, 0.5P
CASE 506AV-01
ISSUE B
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED TERMINAL
AND IS MEASURED BETWEEN 0.25 AND
0.30 mm FROM TERMINAL.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
ÉÉ
ÉÉ
ÉÉ
A B
E
D
D2
E2
BOTTOM VIEW
b
e
8X
0.10 B
0.05
AC
C
K8X
NOTE 3
2X
0.10 C
PIN ONE
REFERENCE
TOP VIEW
2X 0.10 C
8X
A
A1
(A3)
0.08 C
0.10 C
C
SEATING
PLANE
SIDE VIEW
L
8X 14
58
DIM MIN NOM MAX
MILLIMETERS
A0.45 0.50 0.55
A1 0.00 0.03 0.05
A3 0.127 REF
b0.20 0.25 0.30
D2.00 BSC
D2 1.40 1.50 1.60
E2.20 BSC
E2 0.70 0.80 0.90
e0.50 BSC
K0.20 --- ---
L0.35 0.40 0.45
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇÇ
ÇÇÇ
ÇÇÇ
ÇÇÇ
ÇÇÇ
ÇÇÇ
8X
0.48
1.60
0.80
10.25
0.50
PITCH
2.15
8X
DIMENSIONS: MILLIMETERS
*For additional information on our Pb-Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
NCP2820/D
PUBLICATION ORDERING INFORMATION
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 USA/Canada
Europe, Middle East and Africa Technical Support:
 Phone: 421 33 790 2910
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 Phone: 81-3-5773-3850
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 Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada
 Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada
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For additional information, please contact your local
Sales Representative