LM4880

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 Ω 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 UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R502-033,A 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 °C °C °C THERMAL CHARACTERISTICS PARAMETER Thermal resistance from junction to Case DIP-8 SOP-8 Thermal resistance from junction to Ambient DIP-8 SOP-8 SYMBOL θJC RATINGS 37 35 107 170 UNIT °C/W θJA °C/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°C , 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 µA VIN=0V 5 50 mV THD=0.1%(max) RL=8Ω 200 250 mW 85 mW RL=32Ω Po THD+N=10% 325 mW RL=8Ω RL=32Ω 110 mW 0.03 % Total Harmonic Distortion + Noise RL=8Ω, Po=200mW THD+N 0.02 % RL=32Ω, Po=75mW CB=1.0μF 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. 2 QW-R502-033,A UTC LM4880 CMOS IC 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. TYPICAL APPLICATION VDD RF 20kΩ + Ri 20kΩ 50kΩ 5 3 Shutdown Bypass 50kΩ + 6 IN B RL 8 Ω or 32Ω GND 4 *Co OUT B 7 + Bias VDD/2 2 IN A CS 0.1 F μ + 8 + RL 8 Ω or 32Ω *Co OUT A 1 + Audio Input *Ci CB 1.0μF Audio Input *Ci Ri 20kΩ + + RF 20kΩ 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/(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). UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R502-033,A UTC LM4880 AUTOMATIC SHUTDOWN CIRCUIT VDD AUDIO INPUT 20kΩ + 2 0.1μF CMOS IC 8 UTC 1 0.33μF 20kΩ LM4880 3 5 + + 4 Rsd 1μF 100kΩ HEADPHONE JACK 100μF + VDD RO 1kΩ Rp 1MΩ TO CHANNEL B OUTPUT(PIN 7) VIA COUPLING CAPACITOR Figure 2. Automatic Shutdown Circuit AUTOMATIC SWITCHING CIRCUIT VDD AUDIO INPUT 20kΩ + 20kΩ 2 3 1μF + 8 0.1μF UTC 1 LM4880 5 + 4 Rsd 100kΩ 100µF + VDD RO 1kΩ Rp 1MΩ TO UTC LM4880 CHANNEL B OUTPUT (PIN 7) VIA COUPLING CAPACITOR 0.1µF HEADPHONE JACK 0.33μF 20kΩ VDD 6 4 3 5 LM4861 8 + 1 7 2 RL 8Ω + 0.33μF 20kΩ 1μF + Figure 3.Automatic Switching Circuit UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R502-033,A UTC LM4880 TYPICAL PERFORMANCE CHARACTERISTICS 10 CMOS IC THD+N vs Output Power 10 f=1kHz RL=8Ω AV=-1 BW