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UNISONIC TECHNOLOGIES CO., LTD 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
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 Package DIP-8 HSOP-8 HSOP-8 Packing Tube Tape Reel Tube
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PIN CONFIGURATION
CMOS IC
PIN DESCRIPTION
PIN NO 1 2 3 4 5 6 7 8 PIN NAME OUT A IN A BYPASS GND SHUTDOWN IN B OUT B VDD I/O O I I I 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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ABSOLUTE MAXIMUM RATINGS (Note 2)
CMOS IC
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 DIP-8 HSOP-8 DIP-8 HSOP-8 SYMBOL JA JC RATINGS 107 42.3 37 12 RATINGS 2.7 ~ 5.5 -40 ~ +85 UNIT C/W C/W
OPERATING RATINGS
PARAMETER Supply Voltage Temperature Range (TMINTaTMAX) SYMBOL VDD Ta UNIT V C
ELECTRICAL CHARACTERISTICS (Note 1,2)
(Ta=25C , 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 A Output Offset Voltage VO(OFF) VIN=0V 5 50 mV THD=0.1%(max) RL=8 200 250 mW , f=1KHz RL=32 85 mW Output Power POUT THD+N=10%, RL=8 325 mW f=1KHz RL=32 110 mW RL=8, POUT=200mW, f=1KHz 0.03 % Total Harmonic Distortion + Noise THD+N RL=32, POUT=75mW, f=1KHz 0.02 % Cb=1.0F 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 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.
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TYPICAL APPLICATION
CMOS IC
VDD RF 20k + Ri 20k 50k 5 3 Shutdown Bypass 50k + 6 IN B 15k RF 20k GND 4 RL 8 or 32 *Co OUT B 7 + Bias VDD/2 2 IN A CS + 0.1 F
Audio Input *Ci
8 + 15k RL 8 or 32 *Co OUT A 1 +
CB 1.0 F Audio Input *Ci Ri 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/(2 RiCi). 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/(2 RiCi). 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/(2 RLCo).
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LM4880
AUTOMATIC SHUTDOWN CIRCUIT
VDD AUDIO INPUT 0.33 20k + F 20k 1 2 0.1 8 UTC 1 LM4880 3 5 + + 4 Rsd F 100k F HEADPHONE JACK 100 + VDD Rp 1M TO CHANNEL B OUTPUT(PIN 7) VIA COUPLING CAPACITOR F
CMOS IC
RO 1k
Figure 2. Automatic Shutdown Circuit
AUTOMATIC SWITCHING CIRCUIT
V DD
AUDIO INPUT 20k 0.1 2 UTC 1 LM4880 3 5 + 4 + Rsd 100k 8 F
+ 0.33 F
20k
100F +
VDD
HEADPHONE JACK
1
F
Rp 1M
RO 1k
20k V DD
0.1F
TO UTC LM4880 CHANNEL B OUTPUT (PIN 7) VIA COUPLING CAPACITOR
+ 0.33 F
20k
4 3
6 +
LM4861
5 8
1F
+
RL 8
27
1
Figure 3.Automatic Switching Circuit
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TYPICAL CHARACTERISTICS
CMOS IC
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LM4880
TYPICAL CHARACTERISTICS(Cont.)
CMOS IC
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TYPICAL CHARACTERISTICS(Cont.)
CMOS IC
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TYPICAL CHARACTERISTICS(Cont.)
CMOS IC
0.0 -20.00 -40.00 -60.00 -80.00 -100.0
Channel Separation
RL=8 POUT =200mW 0dB=200mW GV=1 CB=1.0 F Channel B to A 0.0 10.00 20.00 Output Attenuation (dB) 30.00 40.00 50.00 60.00 70.00 80.00 90.00 20 100 1k Frequency (Hz) 10k 20k 100.0 20
Output Attenuatin in Shutdown Mode
0dB=1.3Vrms R L=8 V DD =5.0V V PIN3=5.0V
Output Level (dB)
Ri =RF=10k
Channel A to B -120.0 -140.0
Ri =10k RF =20k 100
Ri=RF=20K 1k Frequency (Hz) 10k 20k
1m RL=8 GV=1 BW<22kHz 100
Noise Floor
70 60 50 PSRR (dB) 40 30 20 10
CB
Power Supply Rejection Ratio
VPIN3=2.5V(FORCED)
Noise Floor ( V)
.0 =1
F
W II
1 0.
F
10
C
B=
0 1.
F
0 II
.1
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
22 5 180
5.0 4.5
Supply Current vs Supply Voltage
VPIN5 =0V RL= 8
80 Gain
4.0 Supply Current (mA) 3.5 3.0 2.5 2.0 1.5 1.0 0.5
Gain (dB)
60
40
Phase
90
20
45
0
10
100
1k
10k 100k 1M Frequency (Hz)
0 10M 100M
Phase (o)
135
0.0 2.5
3.0
3.5 4.0 4.5 Supply Voltage (V)
5.0
5.5
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TYPICAL CHARACTERISTICS(Cont.)
Frequency Response vs. Output Capacitor Size
5.0000 GV =-1, Ci=10 F Ri=20k RL =8
CMOS IC
Frequency Response vs. Output Capacitor Size
5.0000 GV =-1, Ci =10 F Ri=20k RL=32
0.0
0.0
Output Level (dB)
Output Level (dB)
Co=220 F
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
1k
10k
100k
-20.00
20
100
1k
10k
100k
Frequency (Hz) Frequency Response vs Input Capacitor Size
5.0000 5.0000
Frequency (Hz) Typical Application Frequency Response
0.0
0.0
Output Level (dB)
Output Level (dB)
Ci=0.1 F
-5.000
Ci=0.22 F Ci=0.47 F Ci=1.0 F
-5.000
Ci=0.1 F Co=470 F
i
-10.00
-10.00
Ci=1.0 F Co=470 F
-15.00
-20.00
Gv=-1 Ri=20k CoUT=10000 F RL=8
-15.00
Gv=-1 Ri=20k RL=8
20
100
1k
10k
100k
-20.00
20
100
1k
10k
100k
Frequency (Hz) Typical Application Frequency Response
5.0000
Frequency (Hz)
0.0
Output Level (dB)
-5.000
Ci=1.0 F Co=220 F Ci=0.1 F Co=220 F
-10.00
-15.00
Gv=-1 Ri=20k RL=32
-20.00
20
100
1k
10k
100k
Frequency (Hz)
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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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