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UTC LM4880
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 8 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.
CMOS IC
DIP-8
SOP-8
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
PIN CONFIGURATION
OUT A
1
8
VDD
IN A
2
7
OUT B
BYPASS
3
6
IN B
GND
4
5
SHUTDOWN
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UTC LM4880
ABSOLUTE MAXIMUM RATINGS (Note 2)
PARAMETER
Supply Voltage Input Voltage ESD Susceptibility (Note 3) ESD Susceptibility (Note 4) Power Dissipation (Note 5) Operating Temperature Storage Temperature Junction Temperature
CMOS IC
SYMBOL
VDD Vi ESD PD Topr Tstg Tj
RATINGS
6.0 -0.3 ~ VDD+0.3 3500 250 Internally limited -40 ~ +85 -65 ~ +150 150
UNIT
V V V V
THERMAL CHARACTERISTICS
PARAMETER
Thermal resistance from junction to Case DIP-8 SOP-8 Thermal resistance from junction to Ambient DIP-8 SOP-8
SYMBOL
JC
RATINGS
37 35 107 170
UNIT
/W
JA
/W
OPERATING RATINGS
PARAMETER
Supply Voltage Temperature Range (TMIN Ta TMAX)
SYMBOL
VDD Ta
RATINGS
2.7 ~ 5.5 -40 ~ +85
UNIT
V
ELECTRICAL CHARACTERISTICS (Note 1,2) (Ta=25 , The following specifications apply for VDD=5V, f=1kHz unless otherwise specified)
PARAMETER
Supply Voltage Quiescent Power Supply Current Shutdown Current Output Offset Voltage Output Power
SYMBOL
VDD IDD ISD Vos
TEST CONDITIONS
MIN
2.7
TYP MAX UNIT
5.5 V VIN=0V, Io=0A 3.6 6.0 mA VPIN5=VDD 0.7 5 A VIN=0V 5 50 mV THD=0.1%(max) RL=8 200 250 mW 85 mW RL=32 Po THD+N=10% 325 mW RL=8 RL=32 110 mW 0.03 % Total Harmonic Distortion + Noise RL=8, Po=200mW THD+N 0.02 % RL=32, Po=75mW CB=1.0 F Power Supply Rejection Ratio 50 dB PSRR 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
UTC
UNISONIC TECHNOLOGIES CO., LTD.
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UTC LM4880
CMOS IC
device performance. Note 3: Human body model, 100 pF discharged through a 1.5 k 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, JA, and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA) / JA 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.
TYPICAL APPLICATION
VDD RF 20k + Ri 20k 50k 5 3 Shutdown Bypass 50k + 6 IN B RL 8 or 32 GND 4 *Co OUT B 7 + Bias VDD/2 2 IN A CS 0.1 F + 8 + RL 8 or 32 *Co OUT A 1 +
Audio Input *Ci
CB 1.0 F Audio Input *Ci Ri 20k
+
+
RF 20k
Figure 1.Typical Audio Amplifier Application Circuit
EXTERNAL COMPONENTS DESCRIPTION (Figure 1)
COMPONENTS
1. 2. 3. 4. 5. 6. Ri Ci RF Cs CB 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/(2RiCi). 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/(2RiCi). 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/(2RLCo).
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AUTOMATIC SHUTDOWN CIRCUIT
VDD AUDIO INPUT 20k + 2 0.1 F
CMOS IC
8 UTC 1 0.33 F 20k LM4880 3 5 + + 4 Rsd 1F 100k
HEADPHONE JACK 100 F + VDD Rp 1M TO CHANNEL B OUTPUT(PIN 7) VIA COUPLING CAPACITOR RO 1k
Figure 2. Automatic Shutdown Circuit
AUTOMATIC SWITCHING CIRCUIT
VDD AUDIO INPUT 20k + 20k 2 3 1F + 8 0.1 F UTC 1 LM4880 5 + 4 Rsd 100k 100F + VDD RO 1k Rp 1M TO UTC LM4880 CHANNEL B OUTPUT (PIN 7) VIA COUPLING CAPACITOR
0.1F
HEADPHONE JACK
0.33 F
20k VDD 6 4 3 5 LM4861 8 + 1 7 2 RL 8
+ 0.33 F
20k
1F
+
Figure 3.Automatic Switching Circuit
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TYPICAL PERFORMANCE CHARACTERISTICS
10
CMOS IC
THD+N vs Output Power
10 f=1kHz RL=8 AV=-1 BW<80kHz
THD+N vs Output Power
f=20Hz RL=8 Av=-1 BW<80kHz
THD+N (%)
0.1
THD+N (%)
1
1
0.1
0.01 5m
10m
0.1 OUTPUT POWER (W)
0.5
0.01 5m
10m
0.1 OUTPUT POWER (W)
0.5
10
THD+N vs Output Power
f=20kHz RL=8 AV=-1 BW<80kHz THD+N (%) 10
THD+N vs Output Power
f=20Hz RL=32 AV=-1 BW<80kHz
THD+N (%)
1
1
0.1
0.1
0.01 5m
10m
0.1 OUTPUT POWER (W)
0.5
0.01 5m
10m OUTPUT POWER (W)
0.1
0.2
10
THD+N vs Output Power
f=1kHz RL=32 AV=-1 BW<80kHz THD+N (%)
10
THD+N vs Output Power
f=20kHz RL=32 AV=-1 BW<80kHz
THD+N (%)
1
1
0.1
0.1
0.01 5m
10m OUTPUT POWER (W)
0.1
0.2
0.01 5m
10m OUTPUT POWER (W)
0.1
0.2
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CMOS IC
THD+N vs Frequency
2 VDD=5V PO=75mW 1 RL=32 NO FILTERS
THD+N vs Frequency
VDD=5V PO=200mW RL=8 NO FILTERS THD+N (%)
1 THD+N (%)
Av=-10 0.1 Av=-5
0.1
Av=-10 Av=-5
Av=-1 0.01 20 0.01 20
Av=-1
100
1k FREQUENCY (Hz)
10k 20k
100
1k FREQUENCY (Hz)
10k 20k
0.1
THD+N vs Frequency
VDD=5V VO=4VPP RL=10k AV=-1 BW<80kHz THD+N (%)
2
THD+N vs Frequency
VDD=3.3V 1 PO=30mW RL=32 AV=-1 NO FILTERS
THD+N (%)
0.01
0.1
0.001 20
100
1k FREQUENCY (Hz)
10k 20k
0.01
20
100
1k FREQUENCY (Hz)
10k 20k
300
Output Power vs Load Resistance
VDD=5.0V f=1kHz THD+N<1.0% AV=-1 BW<80kHz 400
Output Power vs Load Resistance
VDD=5.0V f=1kHz THD+N<10% AV=-1 BW<80kHz
OUTPUT POWER (mW)
200
OUTPUT POWER (mW)
300
200
100
100
0
0
10
20
30
40
50
60
70
0
0
10
20
30
40
50
60
70
LOAD RESISTANCE (
LOAD RESISTANCE (
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Output Power vs Supply Voltage
450 400 350 OUTPUT POWER (mW) 300 250 200 150 100 50 0 2.5 3.0 0.1% THD+N 10% THD+N 1% THD+N f=1kHz RL=8 Av=-1 BW<80kHz OUTPUT POWER (mW) 300 f=1kHz RL=16 Av=-1 BW<80kHz 10% THD+N
CMOS IC
Output Power vs Supply Voltage
250 200 150 100 50
1% THD+N
0.1% THD+N
3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
0 2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
Output Power vs Supply Voltage
150 f=1kHz RL=32 125 Av=-1 BW<80kHz OUTPUT POWER (mW) 100 10% THD+N 75 1% THD+N 50 0.1% THD+N 25 0 2.5
650 600 CLIPPING VOLTAGE (mV) 550 500 450 400 350 300 2.5
Clipping Voltage vs Supply Voltage
RL=8
3.0
3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
3.0
3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
150
Clipping Voltage vs Supply Voltage
RL=32
200
Power Dissipation vs Output Power
CLIPPING VOLTAGE (mV)
130
POWER DISSIPATION (mW)
140
RL=8 150
100
RL=16 RL=32
120
50
110
VDD=5V f=1kHz THD+N<1.0% Av=-1 BW<80kHz 0 50 100 150 200 250 300
100 2.5
3.0
5.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.5
0
OUTPUT POWER (mW)
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0.0 -20.00 OUTPUT LEVEL (dB) -40.00 -60.00 -80.00 -100.0 Channel A to B -120.0 -140.0
CMOS IC
0.0 10.00 OUTPUT ATTENUATION (dB) 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 Ri=10k RF=20k 20 100 Ri=RF=20K 1k FREQUENCY (Hz) 10k 20k Ri=RF=10k
Channel Separation
RL=8 PO=200mW 0dB=200mW AV=1 CB=1.0 F Channel B to A
Output Attenuatin in Shutdown Mode
0dB=1.3Vrms R L=8 VDD=5.0V VPIN3=5.0V
20
100
1k FREQUENCY (Hz)
10k 20k
100.0
1m RL=8 AV=1 BW<22kHz NOISE FLOOR ( V) 100
Noise Floor
70 60 50 PSRR (dB) 40 30 20 10
C
Power Supply Rejection Ratio
VPIN3=2.5V(FORCED)
B=
0 1.
F
1 0. II W
F
10
C
B=
0 1.
F
1 0. II
F
CB=0.1 F 1 20 100 1k FREQUENCY (Hz) 10k 20k 0 10 100 1k
VDD=5.0V VRIPPLE=200mVrms 0dB=200mVrms RL=8 10k 100k
FREQUENCY (Hz)
100
Open Loop Frequency Response
225
5.0 4.5
Supply Current vs Supply Voltage
VPIN5=0V RL= 8
80 Gain
180 SUPPLY CURRENT (mA)
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5
GAIN (dB)
60
135 Phase
40
90
20
45
0 10
100
1k
10k 100k 1M FREQUENCY (Hz)
10M
0 100M
PHASE (o)
0.0 2.5
3.0
3.5 4.0 4.5 SUPPLY VOLTAGE (V)
5.0
5.5
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Frequency Response vs Output Capacitor Size
5.0000 AV =-1, Ci =10 F Ri=20k RL=8 5.0000 AV =-1, Ci =10 F Ri=20k RL=32
CMOS IC
Frequency Response vs Output Capacitor Size
0.0 OUTPUT LEVEL (dB)
Co=220 F
0.0 OUTPUT LEVEL (dB)
Co=47 F
-5.000
Co=470 F Co=1000 F Co=2200 F
-5.000
Co=100 F Co=220 F Co=470 F
-10.00
-10.00
-15.00
-15.00
-20.00
20
100
10k 1k FREQUENCY (Hz)
100k
-20.00
20
100
10k 1k FREQUENCY (Hz)
100k
Frequency Response vs Input Capacitor Size
5.0000 5.0000
Typical Application Frequency Response
0.0 OUTPUT LEVEL (dB)
Ci=0.1 F
0.0 OUTPUT LEVEL (dB)
Ci=0.1 F Co=470 F
i
-5.000
Ci=0.22 F Ci=0.47 F Ci=1.0 F
-5.000
-10.00
-10.00
Ci=1.0 F Co=470 F
-15.00
-20.00 20
Av=-1 Ri=20k Co=10000 F RL=8
-15.00
Av=-1 Ri=20k RL=8
100
1k 10k FREQUENCY (Hz)
100k
-20.00
20
100
1k 10k FREQUENCY (Hz)
100k
Typical Application Frequency Response
5.0000
1250
Power Derating Curve
Package DIP-8
-5.000
Ci=1.0 F Co=220 F Ci=0.1 F Co=220 F
POWER DISSIPATION (mW)
0.0 OUTPUT LEVEL (dB)
1000
750
-10.00
500
-15.00
Av=-1 Ri=20k RL=32
250 Package SOP-8
-20.00 20
100
1k
10k
100k
0 -25
0
25
50
75
100
125 )
150
FREQUENCY (Hz)
AMBIENT TEMPERATURE (
UTC
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UTC 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.
UTC
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