NJM2770 HIGH-POWER & LOW-VOLTAGE AUDIO POWER AMPLIFIER ■ GENERAL DESCRIPTION The NJM2770 is high-power and low-voltage audio power amplifier with standby function. No external coupling capacitors required because of the differential output type. Two external resistors adjust the closed loop gain. The output power is 250mW typical at 3V-supply 8ohm-load, and 400mW typical at 4.5v-supply 16ohm-load. The standby current is only 0.1µA typical. The package of NJM2770 is VSP8, and suitable for PCS, codeless telephone, speaker amplifier for hands free system, and especially cellular phone because of low operating current, low standby current, and high power output. ■ FEATURS ●Operating Voltage ●Operating Current ●Low Power-Down Current ●High Power Otput 250mW typ. 400mW typ. ●Gain Range at Voice Band ●Load Impedance ●Thermal Shut Down Function ● Package Outline ● Bipolar Technology ■ PACKAGE OUTLINE NJM2770R NJM2770RB1 +2-+4.5V 2.0mA typ.,at V+=3V 0.1µA typ at V+=3V,RL=8Ω V+=4.5V,RL=16Ω Gv=0-43dB RL=4-200Ω VSP8,TVSP8 ■ PIN CONFIGURATION & BLOCK DIAGRAM Pin Function V+ 6 BIAS -VIN 4 #A +VIN 3 +VREF 2 1 CD 5 VOUT1 1.CD 2.+VREF 3.+VIN 4.-VIN 5.VOUT1 6.V + 7.GND 8.VOUT2 40kΩ 40kΩ 50kΩ 145kΩ 50kΩ #B 8 VOUT2 TSD 7 GND -1- NJM2770 ■ ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage V+ Power Dissipation Operating Temperature Range Storage Temperature Range RATINGS +5 (Ta=25°C) UNIT V PD (VSP8,TVSP8) 400 mW Topr Tstg -40 to +85 -40 to +150 °C °C ■ ELECTRICAL CHARACTERISTICS (V+=3.0V,RL=8Ω,f=1kHz,1pin=2V,Ta=25°C,unless otherwise specified) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Operating Voltage Range V+ 2.0 4.5 V Operating Current ICC RL=∞,no signal 2.0 4.0 mA Power Down Current ICCD RL=∞ 1pin=0.8V,no signal 0.1 1.0 µA Open Loop Gain A V1 80 85 dB Amp#A, f<100Hz Closed Loop Gain AV2 -0.35 0 +0.35 dB Amp#B Output Power PO1 THD=10% 110 250 mW 200 400 mW PO2 V+=4.5V, RL=16Ω, THD=10% Total Harmonic Distortion THD1 PO=100mW, GVD=6dB 0.1 0.5 % + 0.1 % THD2 V =4.5V, RL=16Ω, PO=150mW, GVD=6dB Power Supply Rejection SVR1 50 dB C1=∞, C2=0.01µF, DC Ratio + (V =3.0V-4.5V) SVR2 35 dB C1=0.1µF, C2=0 SVR3 70 dB C1=1.0µF, C2=4.7µF Mute Attenuation MAT f =1kHz-20kHz, 1pin=0.8V 80 dB Output Voltage VO1 0.95 1.10 1.25 V + VO2 1.85 V (Rf=20kΩ, DC) V =4.5V, RL=16Ω Output High Level VOH IOUT=-75mA, V+=2.0-4.5V V+-1.0 V Output Low Level VOL IOUT=75mA, V+=2.0-4.5V 0.21 V -30 0 +30 mV Output DC Offset Rf=20kΩ, 5pin-8pin ∆VO Input Bias Current IB 4pin -100 100 nA Equivalent Resistance R+IN 3pin 100 170 220 kΩ RREF 2pin 18 26 40 kΩ CD Input Voltage H VCDH 1pin 2.0 V+ V CD Input Voltage L VCDL 1pin 0.0 0.8 V CD Input Resistance RCD V+=VCD=4.5V, 1pin 50 85 175 kΩ ■ CONTROL TERMINAL EXPLANATION CHIP DISABLE CONTROL(CD PIN) PARAMETER CONTROL SIGNAL CD OFF H(=VCDH) CD ON L(=VCDL) STATUS IC is active. IC is standby. (with Mute) -2- NJM2770 ■ APPLICATION CURCUIT V+=+3V 10µF Rf 20kΩ 6 BIAS Ci INPUT 4 0.1µF 1 CD(POWER DOWN) Ri #A 20kΩ 5 3 SPEAKER 8Ω/16Ω C1 1.0µF 50kΩ C2 145kΩ #B 8 2 4.7µF 50kΩ TSD 7 note:1.The CD terminal(1pin) should connect High level(>2.0V), when NJM2770 is active. The standby mode, when the CD terminal is Low level(<0.8V). 2.To add the C1 and C2 capacitor, the power-supply-rejection-ratio will be improved. When C1 is large vaiue, C2 will be unnecessary. 3.The power-up time depend on the C1 and C2 capacitor. 4.The input current of CD terminal is as shown below figure. V + 72kΩ 1pin 80kΩ GND 5.No connect oscillation-protect RC required. To connect oscillation-protect RC, if the NJM2770 oscillate with PC board/stray capacitor/long speaker wire and others condition. -3- NJM2770 MEMO [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. -4-