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
*Pb-free plating product number: LM4880L
*No bootstrap capacitors or snubber circuits are necessary *Unity-gain stable
*External gain configuration capability
APPLICATIONS
*Personal Computers *CD-ROM Players *Headphone Amplifier
ORDERING INFORMATION
Ordering Number
Package Packing Normal Lead Free Plating
LM4880-D08-T LM4880L-D08-T DIP-8 Tube LM4880-SH2-R LM4880L-SH2-R HSOP-8 Tape Reel LM4880-SH2-T LM4880L-SH2-T HSOP-8 Tube
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QW-R502-033,B
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LM4880 CMOS IC
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO PIN NAME 1 OUT A 2 IN A 3 BYPASS 4 GND I/O DESCRIPTION O Channel A output
I Channel A audio input
I Connect to internal voltage divider for middle supply bias Ground
Shutdown mode control input, high active, place LM4880 into shutdown 5 SHUTDOWN I mode, when held high
6 IN B I Channel B audio input 7 OUT B O Channel B output 8 VDD Supply voltage
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LM4880 CMOS IC
ABSOLUTE MAXIMUM RATINGS (Note 2)
PARAMETER SYMBOLRATINGS 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 SYMBOLRATINGS UNIT DIP-8107
Thermal Resistance From Junction to Ambient θJA °C/W
HSOP-842.3
DIP-8 37 Thermal Resistance From Junction to Case θJC °C/W
HSOP-812
OPERATING RATINGS
PARAMETER SYMBOLRATINGS UNIT Supply Voltage VDD 2.7 ~ 5.5 V Temperature Range (TMIN≤Ta≤TMAX) Ta -40 ~ +85 °C
ELECTRICAL CHARACTERISTICS (Note 1,2)
(Ta=25°C , The following specifications apply for VDD=5V, f=1kHz unless otherwise specified)
PARAMETER SYMBOLTEST CONDITIONS MIN TYP MAXUNIT
Supply Voltage VDD 2.7 5.5 V Quiescent Power Supply Current IDD VIN=0V, IOUT0A 3.6 6.0 mA Shutdown Current ISHDN VPIN5=VDD 0.7 5 µA Output Offset Voltage VO(OFF) VIN0V 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 mWf=1KHz RL=32Ω 110 mWRL=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
VDDRF20k+Ri20k50k53CB1.0 FAudioInput*CiRi20k+50k+6IN B-15kRF20kGND4RL
8or32
*CoOUT B7+ShutdownBypassBiasVDD/22IN ACS+0.1FAudioInput*Ci8-+15kRL
8or32
*CoOUT A1++Figure 1.Typical Audio Amplifier Application Circuit
EXTERNAL COMPONENTS DESCRIPTION (Figure 1)
COMPONENTS FUNCTIONAL DESCRIPTION Inverting input resistance which sets the closed-loop gain in conjunction with RF. This resistor 1. Ri 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
2. Ci creates a high pass filter with Ri at fc = 1/(2RiCi). 3. RF 4. Cs 5. CB 6. CO
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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LM4880 CMOS IC
VDDAUDIOINPUT20k+2-80.1FHEADPHONE JACK100F+RO1kRp1MTO CHANNEL BOUTPUT(PIN 7)VIA COUPLING CAPACITOR
AUTOMATIC SHUTDOWN CIRCUIT
UTC 10.33F20kLM488035VDD++4Rsd1F100kFigure 2. Automatic Shutdown Circuit
AUTOMATIC SWITCHING CIRCUIT
VDDAUDIOINPUT20k0.1F2UTC 1LM488035+4+Rsd100k-8+0.33F20k100µF+VDDHEADPHONE JACK1FRp1MRO1k20kΩVDD0.1µFTO UTC LM4880 CHANNEL B OUTPUT (PIN 7) VIA COUPLING CAPACITOR+0.33F20k65 LM486138+1274-RL81F+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 CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
0.0-20.00-40.00-60.00-80.00-100.0
Channel A to B-120.0-140.0
Channel Separation
RL=8POUT=200mW0dB=200mWGV=1CB=1.0FChannel B to A0.010.0020.00Output Attenuation (dB)30.0040.0050.0060.0070.0080.0090.00
20
100
1k
Frequency (Hz)
10k20k
100.0
20
Output Attenuatin in Shutdown Mode
0dB=1.3VrmsRL=8VDD=5.0VVPIN3=5.0VOutput Level (dB)Ri=RF=10kRi=10kRF=20k100
Ri=RF=20K10k20k
1k
Frequency (Hz)
1m
RL=8GV=1BW<22kHz100Noise Floor
70Power Supply Rejection Ratio
VPIN3=2.5V(FORCED)6050PSRR (dB)40302010CB=0.1FCBNoise Floor (V)WII F .0=11F1.0F10CB=.10 IIF .0VDD=5.0VVRIPPLE=200mVrms0dB=200mVrmsRL=81k10k100k1201001kFrequency (Hz)10k20k010100Frequency (Hz)100
Open Loop Frequency Response2251805.04.5Supply Current vs Supply VoltageVPIN5=0VRL=880
Gain4.0Supply Current (mA)3.53.02.52.01.51.00.5Gain (dB)60
40
Phase9020450
101001k
10k100k1MFrequency (Hz)
010M100M
Phase (o)1350.02.5
3.0
3..04.5Supply Voltage (V)
5.05.5
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LM4880 CMOS IC
TYPICAL CHARACTERISTICS(Cont.)
Frequency Response vs. Output Capacitor Size
5.0000
GV=-1, Ci=10FRi=20kRL=8Frequency Response vs. Output Capacitor Size
5.0000GV=-1, Ci=10FRi=20kRL=320.00.0Output Level (dB)Output Level (dB)Co=220 FCo=47 F-5.000
Co=470 FCo=1000 FCo=2200 F-5.000Co=100 FCo=220 FCo=470 F-10.00-10.00-15.00-15.00-20.00
201001k10k100k-20.00201001k10k100kFrequency (Hz)Frequency Response vs Input Capacitor Size5.0000
5.0000Frequency (Hz)Typical Application Frequency Response0.00.0Output Level (dB)Output Level (dB)Ci=0.1 F-5.000
Ci=0.22 FCi=0.47 FCi=1.0 F-5.000Ci=0.1 FFCo=470 i-10.00-10.00Ci=1.0 FCo=470 F-15.00
-20.00
Gv=-1Ri=20kCoUT=10000 FRL=8-15.00Gv=-1Ri=20kRL=8201001k10k100k-20.00201001k10k100kFrequency (Hz)Typical Application Frequency Response5.0000
Frequency (Hz)0.0
Output Level (dB)-5.000
Ci=1.0 FFCo=220 Ci=0.1 FFCo=220 -10.00
-15.00
Gv=-1Ri=20kRL=32-20.00
201001k10k100k
Frequency (Hz)
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LM4880 CMOS IC
UTC assumes no responsibility for equipment failures that result from using products at values thatexceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, orother parameters) listed in products specifications of any and all UTC products described or containedherein. UTC products are not designed for use in life support appliances, devices or systems wheremalfunction of these products can be reasonably expected to result in personal injury. Reproduction inwhole or in part is prohibited without the prior written consent of the copyright owner. The informationpresented in this document does not form part of any quotation or contract, is believed to be accurateand reliable and may be changed without notice.
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