Ordering number : ENA0739D
Bi-CMOS IC
LV4991TT
For Portable Audio Equipment
Monaural BTL Power Amplifier
Overview
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
Symbol
Conditions
Ratings
Unit
VCC max
Pd max
6
Substrate mounted*
V
750
mV
Operating temperature
Topr
-40 to +85
°C
Storage temperature
Tstg
-40 to +150
°C
* Substrate mounted : with 58mm × 89mm × 1.6mm, glass epoxy substrate
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
Recommended load resistance
RL
Conditions
Ratings
Unit
3.6
V
8 to 32
Ω
Allowable operating supply
VCC op1
(at RL = 8Ω)
2.7 to 4.3
V
voltage range
VCC op2
(at RL = 16 to 32Ω)
2.7 to 5.5
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
Symbol
Ratings
Conditions
min
typ
ICCOP
No signal, RL = ∞
Stand-by current drain
ISTBY
No signal, RL = ∞, V2 = LOW
Maximum output power
POMX
THD = 10%
300
450
VIN = -30dBV
4.5
6
Quiescent current drain
Voltage gain
VG
Voltage gain use range
VGR
Total harmonic distortion ratio
THD
Unit
max
3.6
6
0.1
10
0
mA
µA
mW
7.5
dB
26
dB
VIN = -30dBV
0.3
1
Rg = 620Ω, 20 to 20kHz
120
280
µVrms
50
mV
Output noise voltage
VNOUT
Ripple removal ratio
SVRR
Output offset voltage
V OS
Reference (pin 3) voltage
VREF
Pin 2 control HIGH voltage
VSTBH
Power amplifier operation mode
Pin 2 control LOW voltage
VSTBL
Power amplifier standby mode
Pin 4 control HIGH voltage
VCNTH
Second power amplifier operation mode
Pin 4 control LOW voltage
VCNTL
Second power amplifier standby mode
Rg = 620Ω, fr = 100Hz, Vr = -20dBV
Rg = 620Ω
48
-50
%
dB
1.81
V
1.9
VCC
0
0.3
V
V
1.6
VCC
V
0
0.3
V
No.A0739-2/11
LV4991TT
Package Dimensions
3.0
0.5
3.0
4.9
8
1
(0.53)
2
0.65
1.1MAX
0.125
Pd max – Ta
1000
Specified circuit board : 58×89×1.6mm3
glass epoxy board
900
Specified substrate
800 (Both sides)
750
Specified substrate
700 (One sides)
650
600
500
400
390
338
300
200
100
0
– 40
– 20
0
20
40
60
80
100
Ambient temperature, Ta – °C
0.08
(0.85)
0.25
Allowable power dissipation, Pd max – mW
unit : mm (typ)
3245B
SANYO : MSOP8(150mil)
Recommended substrate
1. Two sided substrate
Size : 58mm×89mm×1.6mm
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
C2
0.1µF
R2
22kΩ
R1
C3
0.33µF 22kΩ
from CPU
IN
AMP1
VCC
R3
10kΩ STBY
2
BIAS
8
VCC
TSD
7
GND
VREF
3
C4
1µF
from CPU
+
1
CNT
4
R4
10kΩ
6
CONTROL
+
5
AMP2
V
+ C1 CC
2.2µF
OUT1
VCC
GND
OUT2
Test Circuit
R2
22kΩ
0.33µF
VIN
0.1µF
+
VCC
2.2µF
22kΩ
620Ω
1
8
2
7
10kΩ
VSTBY
LV4991TT
8Ω
3
6
4
5
1µF
10kΩ
No.A0739-4/11
LV4991TT
Pin Description
Pin voltage
Pin No.
1
Symbol
IN
Description
VCC = 3.6V
1.81
Equivalent circuit
Input pin
VCC
1
3kΩ
2
STBY
+
Standby pin
•Standby mode at 0 to 0.3V
VCC
•Operation mode at 1.9 to VCC
21kΩ
3
VREF
1.81
40.7kΩ
121.4kΩ
2
GND
Ripple filter pin
(For connection of capacitor for filter)
100kΩ
VCC
VCC
450kΩ
101kΩ
3
GND
4
CNT
Second amplifier stop control pin
•Second amplifier stopped at 0 to
VCC
20µA
0.3V
11kΩ
100kΩ
4
5
OUT2
8
OUT1
1.81
GND
Power amplifier output pin
VCC
5
+
8
10kΩ
6
GND
Ground pin
7
VCC
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]
0.1
0.22
0.33
Tmu [ms]
≥ 170
≥ 270
≥ 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
STBY
7
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
1
7
5
3
2
0.1
10
7
5
3
2
1
7
5
3
2
0.1
10
2
3
5
7
2
100
3
5
10
7 1000
2
3
1
7
5
3
2
10
2
3
5
7
2
100
3
5
7
%
1000
HD
800
1%
600
400
2.5
3.5
4.5
6.5
5.5
%
HD
=
1%
T
400
200
D
TH
Output power, PO -- mW
D
=
=
10
600
PO -- VCC
fin = 1kHz
VG = 6dB
RL = 32Ω
%
700
10
PO -- VCC
fin = 1kHz
VG = 6dB
RL = 16Ω
TH
Output power, PO -- mW
=
T
0
1.5
1000
600
500
HD
=
1%
T
400
300
200
100
0
1.5
2.5
3.5
4.5
5.5
0
1.5
6.5
2.5
3.5
Supply voltage, VCC -- V
Pd -- PO
RL = 8Ω
VG = 6dB
fin = 1kHz
400
VCC = 5.0V
350
500
400
VCC = 3.6V
300
VCC = 3.0V
200
100
0
10
4.5
5.5
6.5
Supply voltage, VCC -- V
Power dissipation, Pd -- mW
600
7 1000
Supply voltage, VCC -- V
800
700
5
PO -- VCC
fin = 1kHz
VG = 6dB
RL = 8Ω
Output power, PO -- mW
1000
3
200
0.1
1200
2
=
Output power, PO -- mW
3
2
100
10
1400
1200
10
7
5
7
TH
D
THD -- PO
VCC = 5V
3
2
5
Output power, PO -- mW
RL = 32Ω
VG = 6dB
fin = 1kHz
200
