ONSEMI NCP4896FCT1G

NCP4896
1.0 Watt Audio Power
Amplifier with Earpiece
Driving Capability
The NCP4896 is an audio power amplifier designed for portable
communication device applications such as mobile phones. This part
is capable of delivering 1.0 W of continuous average power to an
8.0 BTL load from a 5.0 V power supply and, 250 mW to a 4.0 BTL from 2.6 V power supply. It also provides the control of driving
a single−ended earpiece and delivers 90 mW from a 5.0 V power
supply to a 32 load.
This device provides high quality audio while requiring few
external components and minimal power consumption. It features a
low−power consumption shutdown mode, which is achieved by
driving the shutdown pin with logic Low.
The NCP4896 contains circuitry to prevent from “pop and click”
noise that would otherwise occur during turn−on and turn−off
transitions. It is also efficient when switching modes from BTL to SE
and SE to BTL.
For maximum flexibility, the part provides an externally controlled
gain (with resistors), as well as an externally controlled turn−on time
(with bypass capacitor).
Due to its excellent PSRR, it can be directly connected to the
battery, saving the use of an LDO.
Features
•
•
•
•
•
•
•
•
•
•
•
Single−Ended or Differential Control
1.0 W to an 8.0 BTL Load from a 5.0 V Power Supply
Excellent PSRR: Direct Connection to the Battery
Ultra Low Current Shutdown Mode
2.2 V−5.5 V Operation
External Gain Configuration Capability
External Turn−on Time Configuration Capability
Thermal Overload Protection Circuitry
Up to 1.0 nF Capacitive Load Driving Capability
“Pop and Click” Noise Protection Circuit
This is a Pb−Free Device
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MARKING
DIAGRAM
1
A3
XXX
AYWW
9−PIN FLIP−CHIP
FC SUFFIX
CASE 499AL
C1
A1
XXX
A
Y
WW
= Specific Device Code
= Assembly Location
= Year
= Work Week
PIN CONNECTIONS
9−PIN FLIP−CHIP CSP
A1
A2
A3
SE/BTL
BYP
OUTB
B1
B2
B3
VP
NC
VM
C1
C2
C3
INM
SD
OUTA
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
Typical Applications
• Portable Electronic Devices
• PDAs
• Mobile Phones
 Semiconductor Components Industries, LLC, 2005
March, 2005 − Rev. 3
1
Publication Order Number:
NCP4896/D
NCP4896
RF
20 k
VP
1 F
Cs
Cin
Rin
VP
INM
390 nF 20 k
−
+
BYPASS
OUTA
Co
MONO JACK
47 F
VP
BYPASS
Audio Input
Cb
VIH
SHUTDOWN
SE
VIL
VMC
BRIDGE
1 F
R1
20 k
8.0 LOUD
SPEAKER
16 or 32 EARPIECE
SHUTDOWN
CONTROL
SE/BTL
20 k
D
−
+
BYPASS
R2
OUTB
VM
Figure 1. Typical NCP4896 Application Circuit with Single−Ended Input
PIN DESCRIPTION
Pin
Type
Symbol
Description
A1
I
SE/BTL
When this pin is Low , the audio amplifier is in differential mode. If a High level is applied, the configuration is in
Single−Ended Mode
A2
I
BYP
A3
O
OUTB
B1
I
VP
Positive analog supply of the cell.
NC
Not connected.
B2
Bypass capacitor pin which provides the common mode voltage (VP/2).
Positive output of the amplifier. In high impedance state when the device is in Single−Ended mode.
B3
I
VM
Ground.
C1
I
INM
Audio Input Signal.
C2
I
SD
The device enters in shutdown mode when a low level is applied to this pin.
C3
O
OUTA
Negative output of the amplifier. This is the active output dedicated to a SE load when this configuration is
activated.
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2
NCP4896
MAXIMUM RATINGS (Note 1)
Rating
Symbol
Value
Unit
VP
6.0
V
Supply Voltage
Operating Supply Voltage
Op VP
2.2 to 5.5 V
−
Input Voltage
Vin
−0.3 to Vcc +0.3
V
Max Output Current
Iout
500
mA
Power Dissipation (Note 2)
Pd
Internally Limited
−
Operating Ambient Temperature
TA
−40 to +85
°C
Max Junction Temperature
TJ
150
°C
Storage Temperature Range
Tstg
−65 to +150
°C
Thermal Resistance Junction−to−Air
RJA
90
(Note 3)
°C/W
−
> 2000
> 200
V
−
100 mA
−
ESD Protection
Human Body Model (HBM) (Note 4)
Machine Model (MM) (Note 5)
Latch Up Current at TA = 85°C (Note 6)
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values
(not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage
may occur and reliability may be affected.
1. Maximum electrical ratings are defined as those values beyond which damage to the device may occur at TA = +25°C.
2. The thermal shutdown set to 160°C (typical) avoids irreversible damage on 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 a 500 mm2 area.
4. Human Body Model, 100 pF discharge through a 1.5 k resistor following specification JESD22/A114.
5. Machine Model, 200 pF discharged through all pins following specification JESD22/A115.
6. Maximum ratings per JEDEC Standard JESD78.
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NCP4896
ELECTRICAL CHARACTERISTICS Limits apply for TA between −40°C to +85°C (Unless otherwise noted).
Characteristic
Supply Quiescent Current
Symbol
Conditions
Min
(Note 7)
Typ
Max
(Note 7)
Unit
Idd
VP = 3.0 V, No Load
VP = 5.0 V, No Load BTL
−
−
1.7
1.8
−
mA
VP = 3.0 V, 8.0 BTL
VP = 5.0 V, 8.0 BTL
−
−
1.8
2.0
−
4.0
VP = 5.0 V, No Load, SE
−
1.0
2.5
VP = 5.0 V, 32 SE
−
1.1
−
mA
VP/2
−
V
Common Mode Voltage
Vcm
−
Shutdown Current
ISD
For VP Between 2.2 V to 5.5 V
SD = Low
TA = +25°C
TA = −40°C to +85°C
−
−
−
−
20
−
−
600
2.0
nA
A
Shutdown Voltage High
VSDIH
−
1.4
−
−
V
Shutdown Voltage Low
VSDIL
−
−
−
0.4
V
SE Select
VBTL/SE
−
1.4
−
−
V
DE Select
VSE/BTL
−
−
−
0.4
V
Turning On Time (Note 8)
TWU
Cby = 1.0 F
−
140
−
ms
Turning Off Time (Note 8)
TSD
−
−
20
−
ms
Vloadpeak
VP = 3.0 V, 8.0 , BTL
VP = 5.0 V, 8.0 BTL
2.3
−
2.57
4.3
−
−
V
VP = 5.0 V, 32 SE
−
4.9
−
V
VP = 5.0 V, 32 SE
THD + N < 0.1%
VP = 5.0 V, 16 , SE
THD + N < 0.1%
VP = 5.0 V, 8.0 , BTL
THD + N < 0.1%
−
92
−
mW
−
176
−
−
1080
−
Vos
For VP between 2.2 V to 5.5 V
BTL and SE
−30
1.0
30
PSRR V+
RF = Ri 20 k
VPripple_pp = 200 mV
Cby = 1.0 F
Input Terminated with 10 Output Swing
Rms Output Power
Output Offset Voltage
Power Supply Rejection Ratio
Efficiency
Thermal Shutdown Temperature
Total Harmonic Distortion
PO
dB
f = 217 Hz to 1.0 khz
VP = 5.0 V, 8.0 BTL
VP = 3.0 V, 8.0 BTL
−
−
−66
−67
−
−
VP = 5.0 V, 32 SE
VP = 3.0 V, 32 SE
−
−
−69
−70
−
−
−
64
−
−
63
−
−
160
−
VP = 3.0 V, 8.0 BTL
Porms = 380 mW
VP = 5.0 V, 8.0 BTL
Porms = 1.0 W
Tsd
−
THD + N
RF = Ri 20 k
VP = 3.6 V, f = 1.0 kHz
Pout = 400 mW, 8.0 , BTL
Pout = 40 mW, 16 , BTL
Pout = 40 mW, 32 SE
7. Min/Max limits are guaranteed by design, test or statistical analysis.
8. See section “Application Information” for a theoretical approach of this parameter.
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4
mV
%
°C
%
−
−
−
0.02
0.01
0.003
−
−
−
NCP4896
TYPICAL PERFORMANCE CHARACTERISTICS
10
10
VP = 5.0 V
RF = Ri 20 k
BTL Mode
RL = 8 f = 1.0 kHz
VP = 3.0 V
RF = Ri 20 k
BTL Mode
RL = 8 f = 1.0 kHz
1
THD + N (%)
THD + N (%)
1
0.1
0.1
0.01
0.01
0.001
0.001
0
200
400
600
800
1000
1200
0
Pout, POWER OUT (mW)
200
400
300
500
Pout, POWER OUT (mW)
Figure 2. THD + N vs. Power Out
(BTL Mode)
Figure 3. THD + N vs. Power Out
(BTL Mode)
1
10
VP = 2.6 V
RF = Ri 20 k
BTL Mode
RL = 4 f = 1.0 kHz
1
THD + N (%)
THD + N (%)
100
0.1
VP = 5.0 V
RF = Ri 20 k
BTL Mode
RL = 8 Pout = 250 mW
0.1
0.01
0.001
0.01
0
100
200
300
400
10
500
100
1000
10,000
100,000
FREQUENCY (Hz)
Pout, POWER OUT (mW)
Figure 5. THD + N vs. Frequency
(BTL Mode)
Figure 4. THD + N vs. Power Out
(BTL Mode)
VP = 3.0 V
RF = Ri 20 k
BTL Mode
RL = 8 Pout = 250 mW
0.1
THD + N (%)
THD + N (%)
1
0.01
0.001
VP = 2.6 V
RF = Ri 20 k
BTL Mode
RL = 8 Pout = 100 mW
0.1
0.01
0.001
10
100
1000
10,000
100,000
10
FREQUENCY (Hz)
100
1000
10,000
FREQUENCY (Hz)
Figure 6. THD + N vs. Frequency
(BTL Mode)
Figure 7. THD + N vs. Frequency
(BTL Mode)
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5
100,000
NCP4896
TYPICAL PERFORMANCE CHARACTERISTICS
10.000
VP = 5.0 V
RF = Ri 20 k
SE Mode
RL = 32 f = 1.0 kHz
1.000
THD + N (%)
THD + N (%)
1.000
10.000
0.100
0.010
0.001
0
VP = 3.0 V
RF = Ri 20 k
SE Mode
RL = 32 f = 1.0 kHz
0.100
0.010
20
40
60
0.001
0
100
80
10
OUTPUT POWER (mW)
40
Figure 9. THD + N vs. Output Power
(SE Mode)
1.000
10.000
VP = 2.6 V
RF = Ri 20 k
SE Mode
RL = 32 f = 1.0 kHz
THD + N (%)
THD + N (%)
30
OUTPUT POWER (mW)
Figure 8. THD + N vs. Output Power
(SE Mode)
1.000
20
0.100
VP = 4.2 V
RF = Ri 20 k
SE Mode
RL = 32 Pout = 50 mW
0.100
0.010
0.010
0.001
0
5.0
10
15
20
25
0.001
10
30
100
0
0
−10
−10
VP = 2.6 V
RF = Ri 20 k, Cb = 1.0 F
BTL Mode
RL = 8 Vripple = 200 mV pk−pk
−20
−30
PSRR (dB)
PSRR (dB)
−40
−50
−60
−40
−60
−70
−80
−80
−90
−90
100
1000
10000
100000
VP = 3.6 V
RF = Ri 20 k, Cb = 1.0 F
BTL Mode
RL = 8 Vripple = 200 mV pk−pk
−50
−70
−100
10
100000
Figure 11. THD + N vs. Frequency
(SE Mode)
Figure 10. THD + N vs. Output Power
(SE Mode)
−30
10000
FREQUENCY (Hz)
OUTPUT POWER (mW)
−20
1000
−100
10
100
1000
10000
100000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 12. PSRR (BTL Mode) @ VP = 2.6 V
Figure 13. PSRR (BTL Mode) @ VP = 3.6 V
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NCP4896
TYPICAL PERFORMANCE CHARACTERISTICS
0
0
−10
−10
PSRR (dB)
−30
−40
VP = 5.0 V
RF = Ri 20 k, Cb = 1.0 F
BTL Mode
RL = 8 Vripple = 200 mV pk−pk
−30
−50
−60
−40
−50
−70
−80
−80
−90
−90 Cb=1.0 F
100
1000
10000
−100
10
100000
−30
−40
−50
10000
100000
Figure 15. PSRR vs. Cb (BTL Mode) @ VP = 3.6 V
0
VP = 3.6 V
RF = Ri 20 k and RF = Ri 100 k
BTL Mode
RL = 8 Vripple = 200 mV pk−pk
−10
−20
−30
GAIN = 5
−40
VP = 2.6 V
RF = Ri 20 k, Cb = 1.0 F
SE Mode
RL = 32 Vripple = 200 mV pk−pk
−50
−60
−70
−70
−80
GAIN = 1
−90
−90
−100
10
1000
Figure 14. PSRR (BTL Mode) @ VP = 5.0 V
−60
−80
100
FREQUENCY (Hz)
PSRR (dB)
−20
Cb= 4.7 F
FREQUENCY (Hz)
0
−10
PSRR (dB)
Cb=0.47 F
−60
−70
−100
10
100
1000
10000
−100
10
100000
100
1000
10000
100000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 16. PSRR vs. Gain (BTL Mode) @ VP = 3.6 V
Figure 17. PSRR (SE Mode) @ VP = 2.6 V
0
−20
−30
−40
0
−10
VP = 3.6 V
RF = Ri 20 k, Cb = 1.0 F
SE Mode
RL = 32 Vripple = 200 mV pk−pk
−20
−30
PSRR (dB)R
−10
PSRR (dB)
VP = 3.6 V
RF = Ri 20 k
BTL Mode
RL = 8 Vripple = 200 mV pk−pk
−20
PSRR (dB)
−20
−50
−60
−40
−50
−60
−70
−70
−80
−80
−90
−90
−100
10
100
1000
10000
100000
VP = 5.0 V
RF = Ri 20 k, Cb = 1.0 F
SE Mode
RL = 32 Vripple = 200 mV pk−pk
−100
10
100
1000
10000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 18. PSRR (SE Mode) @ VP = 3.6 V
Figure 19. PSRR (SE Mode) @ VP = 5.0 V
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100000
NCP4896
TYPICAL PERFORMANCE CHARACTERISTICS
0
0
−10
−10
VP = 3.6 V
RF = Ri 20 k
SE Mode
RL = 32 Vripple = 200 mV pk−pk
PSRR (dB)
−30
−40
−50
−30
Cb=0.47 F
−60
−40
GAIN = 5
−50
−60
−70
−70
−80
−100
10
−80
Cb= 4.7 F
−90 Cb=1.0 F
100
GAIN = 1
−90
1000
10000
100000
−100
10
100
1000
10000
100000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 20. PSRR vs. Cb (SE Mode) @ VP = 3.6 V
Figure 21. PSRR vs. Gain (SE Mode) @ VP = 3.6 V
50
OUTPUT NOISE VOLTAGE (Vrms)
50
OUTPUT NOISE VOLTAGE (Vrms)
VP = 3.6 V
RF = Ri 20 k and RF = Ri 100 k
SE Mode
RL = 8 Vripple = 200 mV pk−pk
−20
PSRR (dB)
−20
NCP4896 ON
40
30
20
VP = 3.6 V
RF = Ri 20 k
BTL Mode
RL = 8 10
NCP4896 OFF
0
10
100
1000
VP = 3.6 V
RF = Ri 20 k
SE Mode
RL = 32 40
30
20
NCP4896 ON
10
NCP4896 OFF
0
10
10000
100
1000
10000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 22. Output Noise Voltage (BTL Mode)
@ VP = 3.6 V
Figure 23. Output Noise Voltage (SE Mode)
@ VP = 3.6 V
3.2
2.0
1.9
3.0
1.8
VP = 5.5 V
1.7
VP = 5.0 V
Idd, (mA)
Idd, (mA)
2.8
2.6
VP = 3.0 V
2.4
2.2
RF = Ri = 20 BTL MODE
RL = 8 VP = 2.2 V
2.0
−40
−15
10
35
60
VP = 5.5 V
VP = 5.0 V
1.6
1.5
1.4
VP = 3.0 V
1.3
1.2
RF = Ri = 20 SE MODE
RL =32 VP = 2.2 V
1.1
1.0
−40
85
TEMPERATURE (C°)
−15
10
35
60
85
TEMPERATURE (C°)
Figure 24. Quiescent Current (BTL Mode) vs. VP
Figure 25. Quiescent Current (SE Mode) vs. VP
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NCP4896
TYPICAL PERFORMANCE CHARACTERISTICS
VP = 3.6 V
RF = Ri 20 k, Cb = 1.0 F
BTL Mode
RL = 8 Figure 26. Turn On Sequence (BTL Mode)
@ VP = 3.6 V
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NCP4896
TYPICAL PERFORMANCE CHARACTERISTICS
0.3
PD, POWER DISSIPATION (W)
PD, POWER DISSIPATION (W)
0.7
0.6
0.5
0.4
VP = 5 V
RL = 8 F = 1 kHz
THD + N < 0.1%
0.3
0.2
0.1
0
0.25
0.2
0.15
VP = 3.3 V
RL = 8 F = 1 kHz
THD + N < 0.1%
0.1
0.05
0
0
0.2
0.4
0.6
0.8
1
1.2
0
0.1
0.2
Pout, OUTPUT POWER (W)
Figure 27. Power Dissipation vs. Output Power
0.5
0.4
PD, POWER DISSIPATION (W)
PD, POWER DISSIPATION (W)
0.4
Figure 28. Power Dissipation vs. Output Power
0.25
0.2
0.15
VP = 3 V
RL = 8 F = 1 kHz
THD + N < 0.1%
0.1
0.05
0
0.35
RL = 4 0.3
0.25
0.2
RL = 8 0.15
0.1
VP = 2.6 V
F = 1 kHz
THD + N < 0.1%
0.05
0
0
0.1
0.2
0.3
0.4
0
0.05
0.1
Pout, OUTPUT POWER (W)
0.15
0.2
0.25
0.3
0.35
0.4
Pout, OUTPUT POWER (W)
Figure 29. Power Dissipation vs. Output Power
Figure 30. Power Dissipation vs. Output Power
180
DIE TEMPERATURE (°C) @
AMBIENT TEMPERATURE 25°C
700
PD, POWER DISSIPATION (mW)
0.3
Pout, OUTPUT POWER (W)
PCB Heatsink Area
600
200 mm2
500
50 mm2
500 mm2
400
300
200
PDmax = 633 mW
for VP = 5 V,
RL = 8 100
0
0
20
40
Maximum Die Temperature 150°C
160
140
120
VP = 4.2 V
100
80
80
100
120
140
160
VP = 3.3 V
60
40
60
VP = 5 V
VP = 2.6 V
50
100
150
200
250
PCB HEATSINK AREA (mm2)
TA, AMBIENT TEMPERATURE (°C)
Figure 31. Power Derating − 9−Pin Flip−Chip CSP
Figure 32. Maximum Die Temperature vs.
PCB Heatsink Area
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10
300
NCP4896
APPLICATION INFORMATION
Detailed Description
Shutdown Function
The NCP4896 audio amplifier can operate from 2.2 V
until 5.5 V power supply. It delivers 320 mW rms output
power to 4.0 load (VP = 2.6 V) and 1.0 W rms output
power to 8.0 load (VP = 5.0 V).
The structure of the NCP4896 is basically composed of
two identical internal power amplifiers. Both are externally
configurable with gain−setting resistors Rin and RF (the
closed−loop gain is fixed by the ratios of these resistors).
So the load is driven differentially through OUTA and
OUTB outputs. This configuration eliminates the need for
an output coupling capacitor.
The device enters shutdown mode when the shutdown
signal is low. During the shutdown mode, the Dc quiescent
current of the circuit is typically 10 nA.
Current Limit Circuit
The maximum output power of the circuit
(Porms = 1.0 W, VP = 5.0 V, RL = 8.0 ) requires a peak
current in the load of 500 mA.
In order to limit the excessive power dissipation in the
load when a short−circuit occurs, the current limit in the
load is fixed to 800 mA. The current in the four output MOS
transistors are real−time controlled, and when one current
exceeds 800 mA, the gate voltage of the MOS transistor is
clipped and no more current can be delivered.
Internal Power Amplifier
The output Pmos and Nmos transistors of the amplifier
were designed to deliver the output power of the
specifications without clipping. The channel resistance
(Ron) of the Nmos and Pmos transistors does not exceed
0.6 when they drive current.
The structure of the internal power amplifier is
composed of three symmetrical gain stages, first and
medium gain stages are transconductance gain stages to
obtain maximum bandwidth and DC gain.
Single−Ended Operation
In SE mode, the load is driven from the primary amplifier
output (OUTA). The gain is set by the ration between RF
and Ri.
SE Gain − Rf
Ri
In this SE mode, an output capacitor (Co) is required to
block the common mode voltage at the output of the
amplifier, thus avoiding DC currents in the load. As for the
high pass filter due to the input capacitor and the Ri resistor,
the load gives with Co another first order high pass filter,
the cut−off frequency of which is given by:
Turn−On and Turn−Off Transitions
A cycle with a turn−on and turn−off transition is
illustrated with plots that show both single ended signals on
the previous page.
In order to eliminate “pop and click” noises during
transitions, output power in the load must be slowly
established or cut. When logic high is applied to the
shutdown pin, the bypass voltage begins to rise
exponentially and once the output DC level is around the
common mode voltage, the gain is established slowly
(20 ms). This way to turn−on the device is optimized in
terms of rejection of “pop and click” noises.
A theoretical value of turn−on time at 25°C is given by
the following formula.
Cby: bypass capacitor
R: internal 150 k resistor with a 25% accuracy
Ton = 0.95 * R * Cby
The device has the same behavior when it is turned−off
by a logic low on the shutdown pin. During the shutdown
mode, amplifier outputs are connected to the ground.
However, to cut totally the output audio signal, you only
need to wait for 20 ms.
Fc 1
2
RL Co
SE/BTL Operation
Due to the internal control of each amplifier through
SE/BTL pin, the NCP4896 allows a cost saving for
application which requires to drive a example an 8.0 BTL and a Single−Ended load.
The internal circuitry avoids “pop and click” noises that
could occur in both BTL and Singled−Ended loads during
transitions from SE to BTL and BTL to SE.
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NCP4896
Thermal Overload Protection
Gain−Setting Resistor Selection (Rin and RF)
Internal amplifiers are switched off when the
temperature exceeds 160°C, and will be switched on again
only when the temperature decreases below 140°C.
The NCP4896 is unity−gain stable and requires no
external components besides gain−setting resistors, an
input coupling capacitor and a proper bypassing capacitor
in the typical application.
Both internal amplifiers are externally configurable (RF
and Rin) with gain configuration.
The differential−ended amplifier presents two major
advantages:
− The possible output power is four times larger (the
output swing is doubled) as compared to a single−ended
amplifier under the same conditions.
− Output pins (OUTA and OUTB) are biased at the same
potential VP/2, this eliminates the need for an output
coupling capacitor required with a single−ended
amplifier configuration.
The differential closed loop−gain of the amplifier is
Rin and RF set the closed−loop gain of both amplifier.
In order to optimize device and system performance, the
NCP4896 should be used in low gain configurations.
The low gain configuration minimizes THD + noise
values and maximizes the signal to noise ratio, and the
amplifier can still be used without running into the
bandwidth limitations.
A closed loop gain in the range from 2 to 5 is
recommended to optimize overall system performance.
An input resistor (Rin) value of 22 k is realistic in most
of applications, and doesn’t require the use of a too large
capacitor Cin.
given by Avd *
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 The value of the capacitor must be high enough to ensure
good coupling at low frequencies without attenuation.
However a large input coupling capacitor requires more
time to reach its quiescent DC voltage (VP/2) and can
increase the turn−on pops.
An input capacitor value between 0.1 and 0.39 F
performs well in many applications (With Rin = 22 k).
V
Rf
orms . Vorms is the rms value of
Rin
Vinrms
the voltage seen by the load and Vinrms is the rms value of
the input differential signal.
Output power delivered to the load is given by
Porms (Vopeak)2
(Vopeak is the peak differential
2 * RL
output voltage).
When choosing gain configuration to obtain the desired
output power, check that the amplifier is not current limited
or clipped.
The maximum current which can be delivered to the load
is 500 mA Iopeak 1
.
2 * * Rin * Cin
Bypass Capacitor Selection (Cby)
The bypass capacitor Cby provides half−supply filtering
and determines how fast the NCP4896 turns on.
This capacitor is a critical component to minimize the
turn−on pop. A 1.0 F bypass capacitor value
(Cin = < 0.39 F) should produce clickless and popless
shutdown transitions. The amplifier is still functional with
a 0.1 F capacitor value but is more susceptible to “pop and
click” noises.
Thus, a 1.0 F bypassing capacitor is recommended.
Vopeak
.
RL
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NCP4896
R1
VP
J1
20 k
VP
GND
1 F
Cs
J18
U1
C2
R2
INM
Audio Input
1 F
TP3
TP5
VP
20 k
−
+
BYPASS
Co
OUTA
47 F
R5
VP
J5
1 k
BYPASS
Audio Input
VMC
BRIDGE
1 F
C4
20 k
16 or 32 EARPIECE
IN U2
OR J5
VP
J9
100 k
R4
J12
J13
SHUTDOWN
J6
BIAS
CONTROL
Shutdown Input
J20
J8
RL
8
20 k
TP4
SE/BTL
J10
J11
VP
J19
−
+
BYPASS
OUTB
SE/BTL Input
VM
C5
100 nF
R7
100 k
R6
VP
100 k
Figure 33. Typical NCP4896 Application Circuit with Single−Ended Input
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U2
NCP4896
Silkscreen Layer
Top Layer
Bottom Layer
Figure 34. Demonstration Board for 9−Pin Flip−Chip CSP Device − PCB Layers
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NCP4896
BILL OF MATERIAL
Item
Part Description
PCB
Footprint
Ref
1
NCP4896 Audio Amplifier
U1
2
3.5 mm PCB Jack Connector
U2
3
SMD Resistor 20 k
R1, R2
4
SMD Resistor 100 k
R4, R6, R7
5
SMD Resistor 1.0 k
6
Ceramic Capacitor 1.0 F, 16 V, X7R
7
Manufacturer
Reference
Manufacturer
NCP4896
Decelect−Forgos
(Eurosab)
IEM101−3
0805
Vishnay−Draloric
CRCW0805
0805
Vishnay−Draloric
CRCW0805
R5
0805
Vishnay−Draloric
CRCW0805
C1, C2, C4
0805
Murata
GRM21 Series
GRM21BR71C105KA01L
Tantalum Capacitor 47 F, 6.3 V
C3
B Size
AVX
TPS Series
8
Ceramic Capcitor 100 nF, 50 V, X7R
C5
0805
Murata
GRM21 Series
GRM21BR71H104KA01L
9
Jumper Header Vertical Mount, 2*1, 100 mils
10
Jumper Connector, 400 mils
11
I/O Connector. It Can be Plugged by BLZ5.08/2
(Weidmuller Reference)
Weidmuller
SL5.08/2/90B
12
SMB Connector
J4, J8, J9
Radiall
R114665000
13
Test Point
TP3, TP4, TP5
Keystone
5000
J10, J11, J12,
J13, J19, J20
J18
J1, J5, J6
ORDERING INFORMATION
Device
NCP4896FCT1G
Marking
Package
Shipping†
MAM
9−Pin Flip−Chip
(Pb−Free)
3000/Tape and 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.
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15
NCP4896
PACKAGE DIMENSIONS
9−PIN FLIP−CHIP
FC SUFFIX
CASE 499AL−01
ISSUE O
−A−
4X
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. COPLANARITY APPLIES TO SPHERICAL
CROWNS OF SOLDER BALLS.
D
0.10 C
−B−
E
DIM
A
A1
A2
D
E
b
e
D1
E1
TOP VIEW
A
0.10 C
0.05 C
−C−
A2
A1
SIDE VIEW
SEATING
PLANE
MILLIMETERS
MIN
MAX
0.540
0.660
0.210
0.270
0.330
0.390
1.450 BSC
1.450 BSC
0.290
0.340
0.500 BSC
1.000 BSC
1.000 BSC
D1
e
C
B
e
E1
SOLDERING FOOTPRINT*
A
9X
b
1
2
3
0.05 C A B
0.03 C
0.50
0.0197
BOTTOM VIEW
0.50
0.0197
0.265
0.01
SCALE 20:1
mm inches
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
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.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
N. American Technical Support: 800−282−9855 Toll Free
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USA/Canada
P.O. Box 61312, Phoenix, Arizona 85082−1312 USA
Phone: 480−829−7710 or 800−344−3860 Toll Free USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center
2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051
Fax: 480−829−7709 or 800−344−3867 Toll Free USA/Canada
Phone: 81−3−5773−3850
Email: [email protected]
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ON Semiconductor Website: http://onsemi.com
Order Literature: http://www.onsemi.com/litorder
For additional information, please contact your
local Sales Representative.
NCP4896/D