UTC LM4880 Dual 250mw audio power amplifier with shutdown mode Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LM4880
CMOS IC
DUAL 250mW AUDIO POWER
AMPLIFIER WITH SHUTDOWN
MODE
„
DESCRIPTION
The UTC LM4880 is a dual audio power amplifier capable of
delivering typically 250mW per channel of continuous average power
to an 8Ω load with 0.1% THD+N using a 5V power supply.
The UTC LM4880 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
The unity-gain stable UTC LM4880 can be configured by external
gain-setting resistors.
„
FEATURES
* No bootstrap capacitors or snubber circuits are necessary
* Unity-gain stable
* External gain configuration capability
„
*Pb-free plating product number: LM4880L
APPLICATIONS
* Personal Computers
* CD-ROM Players
* Headphone Amplifier
„
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
LM4880-D08-T
LM4880L-D08-T
LM4880-SH2-R
LM4880L-SH2-R
LM4880-SH2-T
LM4880L-SH2-T
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Copyright © 2007 Unisonic Technologies Co., Ltd.
Package
Packing
DIP-8
HSOP-8
HSOP-8
Tube
Tape Reel
Tube
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LM4880
„
PIN CONFIGURATION
„
PIN DESCRIPTION
PIN NO
1
2
3
4
PIN NAME
OUT A
IN A
BYPASS
GND
CMOS IC
I/O
O
I
I
5
SHUTDOWN
I
6
7
8
IN B
OUT B
VDD
I
O
DESCRIPTION
Channel A output
Channel A audio input
Connect to internal voltage divider for middle supply bias
Ground
Shutdown mode control input, high active, place LM4880 into shutdown
mode, when held high
Channel B audio input
Channel B output
Supply voltage
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LM4880
„
CMOS IC
ABSOLUTE MAXIMUM RATINGS (Note 2)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VDD
6.0
V
Input Voltage
VIN
-0.3 ~ VDD+0.3
V
ESD Susceptibility (Note 3)
3500
V
ESD
ESD Susceptibility (Note 4)
250
V
Power Dissipation (Note 5)
PD
Internally limited
Junction Temperature
TJ
150
°C
Operating Temperature
TOPR
-40 ~ +85
°C
Storage Temperature
TSTG
-65 ~ +150
°C
Note Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
„
THERMAL DATA
PARAMETER
Thermal Resistance From Junction to Ambient
Thermal Resistance From Junction to Case
„
SYMBOL
DIP-8
HSOP-8
DIP-8
HSOP-8
θJC
UNIT
°C/W
°C/W
OPERATING RATINGS
PARAMETER
Supply Voltage
Temperature Range (TMIN≤Ta≤TMAX)
„
θJA
RATINGS
107
42.3
37
12
SYMBOL
VDD
Ta
RATINGS
2.7 ~ 5.5
-40 ~ +85
UNIT
V
°C
ELECTRICAL CHARACTERISTICS (Note 1,2)
(Ta=25°C , The following specifications apply for VDD=5V, f=1kHz unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Supply Voltage
VDD
2.7
5.5
V
Quiescent Power Supply Current
IDD
VIN=0V, IOUT=0A
3.6
6.0
mA
Shutdown Current
ISHDN
VPIN5=VDD
0.7
5
µA
Output Offset Voltage
VO(OFF)
VIN=0V
5
50
mV
THD=0.1%(max) RL=8Ω
200
250
mW
, f=1KHz
RL=32Ω
85
mW
Output Power
POUT
THD+N=10%,
RL=8Ω
325
mW
f=1KHz
RL=32Ω
110
mW
RL=8Ω, POUT=200mW, f=1KHz
0.03
%
Total Harmonic Distortion + Noise
THD+N
RL=32Ω, POUT=75mW, f=1KHz
0.02
%
Cb=1.0µF
Power Supply Rejection Ratio
PSRR
50
dB
VRIPPLE=200mVrms, f=100Hz
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage may occur. Operating ratings indicate
conditions for which the device is functional, but do not guarantee specific performance limits. Electrical
Characteristics state DC and AC electrical specifications under particular test conditions which guarantee
specific performance limits. This assumes that the device is within the operating ratings. Specifications are
not guaranteed for parameters where no limit is given, however, the typical value is a good indication of
device performance.
Note 3: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 4: Machine model, 220 pF ~ 240 pF discharged through all pins.
Note 5: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA,
and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA) /θJA or the
number given in the Absolute Maximum Ratings, whichever is lower. For the UTC LM4880, TJMAX = 15℃, and
the typical junction-to-ambient thermal resistance is 170℃/W for SOP-8 package and 107℃/W for DIP-8
package.
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LM4880
„
CMOS IC
TYPICAL APPLICATION
VDD
Audio
Input *Ci
CS
0.1μF
RF
20kΩ
2
+
+
8
IN A
-
Ri
20kΩ
+
Audio
Input *Ci
+
+
Ri
20kΩ
5
Shutdown
3
Bypass
Bias
RL
8Ω or
32Ω
15kΩ
50kΩ
CB
1.0μF
*Co
OUT A 1 +
VDD/2
50kΩ
*Co
OUT B 7 +
+
6
IN B
15kΩ
RF
20kΩ
RL
8Ω or
32Ω
GND 4
Figure 1.Typical Audio Amplifier Application Circuit
„
EXTERNAL COMPONENTS DESCRIPTION (Figure 1)
COMPONENTS
1.
Ri
2.
Ci
3.
4.
5.
RF
Cs
CB
6.
CO
FUNCTIONAL DESCRIPTION
Inverting input resistance which sets the closed-loop gain in conjunction with RF. This resistor
also forms a high pass filter with Ci at fc = 1/(2πRiCi).
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also
creates a high pass filter with Ri at fc = 1/(2πRiCi).
Feedback resistance which sets closed-loop gain in conjunction with Ri.
Supply bypass capacitor which provides power supply filtering.
Bypass pin capacitor which provides half-supply filtering.
Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high
pass filter with RL at fo = 1/(2πRLCo).
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LM4880
„
CMOS IC
AUTOMATIC SHUTDOWN CIRCUIT
VDD
AUDIO
INPUT
20kΩ
0.1μF
2
8
UTC
1
0.33μF 20kΩ
LM4880
3
5
VDD
+
+
4
Rsd
1μF
100kΩ
+
-
HEADPHONE JACK
100μF
+
RO
1kΩ
Rp
1MΩ
TO CHANNEL B
OUTPUT(PIN 7)
VIA COUPLING
CAPACITOR
Figure 2. Automatic Shutdown Circuit
„
AUTOMATIC SWITCHING CIRCUIT
V DD
AUDIO
INPUT
20kΩ
20kΩ
+
0.33μF
1μF
0.1μF
2
8
-
UTC
1
LM4880
3
5
+
4
+
100µF
+
VDD
Rsd
100kΩ
HEADPHONE JACK
RO
1kΩ
Rp
1MΩ
TO UTC LM4880
CHANNEL B OUTPUT
(PIN 7) VIA COUPLING
CAPACITOR
20kΩ
V DD
0.1µF
20kΩ
+
0.33μF
1μF
+
4
3
6
+
LM4861
2 7
1
5
8
RL
8Ω
Figure 3.Automatic Switching Circuit
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LM4880
„
CMOS IC
TYPICAL CHARACTERISTICS
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LM4880
„
CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
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LM4880
„
CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
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LM4880
TYPICAL CHARACTERISTICS(Cont.)
Channel Separation
0.0
20.00
Channel B to A
-60.00
-80.00
-100.0
Channel A to B
30.00
40.00
50.00
70.00
Ri =10k Ω
RF =20kΩ
90.00
20
100
1k
Frequency (Hz)
100.0
10k 20k
100
20
Noise Floor
1m
Ri=RF=20KΩ
V PIN3=2.5V(FORCED)
60
50
PSRR (dB)
100μ
10 μ
40
CB
30
F
.0μ
=1
W
II
F
1μ
0.
F
0μ
1.
20
C
0
II
μ
.1
F
B=
VDD =5.0V
VRIPPLE =200mVrms
0dB=200mVrms
RL =8 Ω
10
C B =0.1μF
1μ
20
100
100
1k
Frequency (Hz)
0
10k 20k
10
22
5
5.0
40
20
90
45
Supply Current (mA)
135
Phase
10k
100k
Supply Current vs Supply Voltage
V PIN5 =0V
R L=
4.0
Phase (o)
Gain
1k
8
4.5
180
80
100
Frequency (Hz)
Open Loop Frequency Response
60
10k 20k
1k
Frequency (Hz)
Power Supply Rejection Ratio
70
RL=8Ω
G V=1
BW<22kHz
Noise Floor (μV)
Ri =RF =10kΩ
60.00
80.00
-120.0
-140.0
0dB=1.3Vrms
R L=8Ω
V DD =5.0V
V PIN3=5.0V
10.00
Output Attenuation (dB)
Output Level (dB)
-40.00
Output Attenuatin in Shutdown Mode
0.0
RL=8Ω
POUT =200mW
0dB=200mW
GV=1
C B=1.0μF
-20.00
Gain (dB)
„
CMOS IC
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
10
100
1k
10k 100k 1M
Frequency (Hz)
0
10M 100M
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0.0
2.5
3.0
3.5
4.0
4.5
Supply Voltage (V)
5.0
5.5
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„
CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
Frequency Response vs. Output Capacitor Size
Frequency Response vs. Output Capacitor Size
5.0000
5.0000
GV =-1, Ci =10μF
Ri=20kΩ, RL =8Ω
0.0
Co=220μF
-5.000
Output Level (dB)
Output Level (dB)
0.0
Co=470μF
Co=1000μF
-10.00
Co=2200μF
-15.00
-20.00
GV =-1, Ci =10μF
Ri=20kΩ, RL=32Ω
Co=47μF
-5.000
Co=100μF
Co=220μF
-10.00
Co=470μF
-15.00
20
100
10k
1k
-20.00
100k
20
100
Frequency (Hz)
Frequency Response vs Input Capacitor Size
100k
Typical Application Frequency Response
0.0
0.0
Ci=0.1μF
-5.000
Output Level (dB)
Output Level (dB)
10k
5.0000
5.0000
Ci=0.22μF
Ci=0.47μF
-10.00
Ci=1.0μF
Gv=-1
Ri=20k Ω
CoUT=10000μF
RL=8 Ω
-15.00
-20.00
1k
Frequency (Hz)
20
100
1k
10k
100k
Frequency (Hz)
i
Ci=0.1μF
Co=470μF
-5.000
Ci=1.0μF
Co=470μF
-10.00
-15.00
-20.00
Gv=-1
Ri=20kΩ
RL=8Ω
20
100
1k
10k
100k
Frequency (Hz)
Typical Application Frequency Response
5.0000
Output Level (dB)
0.0
Ci=1.0μF
Co=220μ F
-5.000
Ci=0.1μF
Co=220μF
-10.00
-15.00
-20.00
Gv=-1
Ri=20kΩ
RL=32Ω
20
100
1k
10k
100k
Frequency (Hz)
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LM4880
CMOS IC
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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