LV4991TT_08

Ordering number : ENA0739D Bi-CMOS IC LV4991TT Overview For Portable Audio Equipment Monaural BTL Power Amplifier LV4991TT incorporates the power amplifier circuit operable at low voltage (2.7V or more) and has additionally the standby function to reduce the current drain. This is the best LSI for speaker drive for the battery-driven portable equipment, such as IC recorders, portable radios, etc. The LV4991TT is a MSOP8 (150mil) package, and The LV4991TH of HMSOP8 (150mil) package is available. Function and Feature • Monaural BTL power amplifier incorporated Standard output power = 450mW (VCC = 3.6V, RL = 8Ω, THD = 10%) Output coupling capacitor not necessary because of differential output type • Operation at low voltage possible VCC = 2.7V or more • Standby function incorporated Standard current drain at standby = 0.1µA (VCC = 3.6V) • Second amplifier stop control function incorporated : Reducing the pop sound at startup, simple MUTE • Overheat protection circuit incorporated • Gain setting possible BTL voltage gain = 0 to 26dB • Output phase compensation capacitor not necessary Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 51408 MS 20080423-S00003 / 80807 MS / 62707 MS PC / 52307 MS IM / 41807 MS PC 20070322-S00004 No.A0739-1/11 LV4991TT Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Substrate mounted* Conditions Ratings 6 750 -40 to +85 -40 to +150 Unit V mV °C °C * Substrate mounted : with 58mm × 89mm × 1.6mm, glass epoxy substrate Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Recommended load resistance Allowable operating supply voltage range Symbol VCC RL VCC op1 VCC op2 (at RL = 8Ω) (at RL = 16 to 32Ω) Conditions Ratings 3.6 8 to 32 2.7 to 4.3 2.7 to 5.5 Unit V Ω V V * Determine the supply voltage to be used with due consideration of allowable power dissipation. Electrical Characteristics Ta = 25°C, VCC = 3.6V, fin = 1kHz, RL = 8Ω Parameter Quiescent current drain Stand-by current drain Maximum output power Voltage gain Voltage gain use range Total harmonic distortion ratio Output noise voltage Ripple removal ratio Output offset voltage Reference (pin 3) voltage Pin 2 control HIGH voltage Pin 2 control LOW voltage Pin 4 control HIGH voltage Pin 4 control LOW voltage Symbol ICCOP ISTBY POMX VG VGR THD VNOUT SVRR V OS VREF VSTBH VSTBL VCNTH VCNTL Power amplifier operation mode Power amplifier standby mode Second power amplifier operation mode Second power amplifier standby mode 1.9 0 1.6 0 VIN = -30dBV Rg = 620Ω, 20 to 20kHz Rg = 620Ω, fr = 100Hz, Vr = -20dBV Rg = 620Ω -50 1.81 VCC 0.3 VCC 0.3 Conditions min No signal, RL = ∞ No signal, RL = ∞, V2 = LOW THD = 10% VIN = -30dBV 300 4.5 0 0.3 120 48 50 Ratings typ 3.6 0.1 450 6 7.5 26 1 280 max 6 10 mA µA mW dB dB % µVrms dB mV V V V V V Unit No.A0739-2/11 LV4991TT Package Dimensions unit : mm (typ) 3245B Allowable power dissipation, Pd max – mW 1000 900 Pd max – Ta Specified circuit board : 58×89×1.6mm3 glass epoxy board Specified substrate 3.0 8 800 (Both sides) 750 Specified substrate 700 (One sides) 650 600 500 400 300 200 100 0 – 40 – 20 0 20 40 60 80 100 390 338 3.0 4.9 1 (0.53) 2 0.65 0.25 (0.85) 1.1MAX 0.125 0.5 Ambient temperature, Ta – °C SANYO : MSOP8(150mil) Recommended substrate 1. Two sided substrate Size : 58mm×89mm×1.6mm 0.08 Top Layer Bottom Layer 2. One sided substrate Size : 58mm×89mm×1.6mm Top Layer Bottom Layer No.A0739-3/11 LV4991TT Block Diagram and Sample Application Circuit V + C1 CC 2.2µF R2 22kΩ C2 0.1µF R1 C3 0.33µF 22kΩ IN 1 VCC 2 BIAS + TSD AMP1 VCC 8 OUT1 VCC from CPU R3 10kΩ STBY 7 GND VREF C4 1µF from CPU CNT R4 10kΩ 3 + 6 GND 4 CONTROL AMP2 5 OUT2 Test Circuit + VCC 2.2µF R2 22kΩ 0.1µF 0.33µF VIN 620Ω VSTBY 22kΩ 10kΩ 1 8 2 7 LV4991TT 1µF 10kΩ 3 6 8Ω 4 5 No.A0739-4/11 LV4991TT Pin Description Pin voltage Pin No. 1 IN Symbol VCC = 3.6V 1.81 Input pin Description Equivalent circuit VCC 1 + - 3kΩ 2 STBY Standby pin •Standby mode at 0 to 0.3V •Operation mode at 1.9 to VCC VCC 2 21kΩ 121.4kΩ 40.7kΩ GND 3 VREF 1.81 Ripple filter pin (For connection of capacitor for filter) VCC 100kΩ VCC 3 450kΩ 101kΩ GND 4 CNT Second amplifier stop control pin •Second amplifier stopped at 0 to 0.3V VCC 4 11kΩ 100kΩ 20µA GND 5 8 OUT2 OUT1 1.81 Power amplifier output pin VCC 5 8 10kΩ + - 6 7 GND VCC Ground pin Power pin No.A0739-5/11 LV4991TT Cautions for use 1. Input coupling capacitor (C3) The input coupling capacitor C3 and input resistor R1 make up the high-pass filter, attenuating the bass frequency. Therefore, the capacitance value must be selected with due consideration of the pass band. Note with care that this capacitance value affects the pop sound at startup. Namely, the increased capacitance value will make the pop sound louder. 2. Pin 3 capacitor (C4) This capacitor C4 is designed to reduce the power ripple. The ripple removal ratio increases when the capacitance is larger. Note however that this capacitor affects the pop sound at startup. Design must therefore be made by taking into both features as above described. 3. Pin 4 control (second amplifier stop control function) Pin 4 is a pin to turn ON/OFF the operation of second amplifier. By using this function, the pop sound at startup can be reduced. Note that pin 4 can be controlled by applying the voltage described below : Second amplifier ON ⇒ V4 = 1.6 to VCCV or OPEN Second amplifier OFF ⇒ V4 = 0 to 0.3V When the pin-3 capacitor C4 is downsized, the pop sound becomes louder. The pop sound can be reduced by providing the time Tmu to stop the second amplifier (see Fig. 1) while utilizing this function of the microcomputor. The recommended mute time Tmu is as follows. Pin 2:STBY Pin 4:CNT C4 [µF] Tmu [ms] 0.1 ≥ 170 0.22 ≥ 270 0.33 ≥ 280 Between pins 8 and 5: OUT1-OUT2 AMP2:ON Tmu time Fig. 1 4. Standby pin (pin 2) By controlling the standby pin, the mode changeover can be made between standby and operation modes. Standby mode ⇒ V2 = 0 to 0.3V Operation mode ⇒ V2 = 1.9 to VCCV When using the standby pin as interlocked with power supply as shown in Fig. 2, care should be taken because the current ISTBY as expressed by the following equation flows through the standby pin. VCC VCC−1.4V ISTBY = R3+21kΩ VCC R3 7 STBY 2 Fig. 2 No.A0739-6/11 LV4991TT 5. Bypass capacitor (C2) of the power supply block The bypass capacitor attached to the power pin (pin 7) must be arranged as near to this pin as possible. 6. Short-circuit between pins When power is applied with pins left short-circuited, deterioration or damage may result. Therefore, check before power application if pins are short-circuited with solder, etc. during mounting of IC to the substrate. 7. Short-circuit of load If the load is left short-circuited for a long period of time, deterioration or damage may occur. Never allow the load to short-circuit. 8. Maximum rating When IC is used near the maximum rating, there is a possibility that the maximum rating may be exceeded even under the smallest change of conditions, resulting in failure. Take the sufficient margin for variation of supply voltage and use IC within a range where the maximum rating will never be exceeded. No.A0739-7/11 LV4991TT 100 7 5 3 2 10 7 5 3 2 1 7 5 3 2 0.1 10 2 3 5 7 100 2 3 5 7 1000 Total harmonic distortion, THD -- % Total harmonic distortion, THD -- % RL = 8Ω VG = 6dB fin = 1kHz 200