Ordering number : ENA0743B
Bi-CMOS IC
LV4991TH
For Portable Audio Equipment
Monaural BTL Power Amplifier
Overview
LV4991TH 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 portable DVD player, Notebook PC, etc. The LV4991TH is a HMSOP8 (150mil) package, and The
LV4991TT of MSOP8 (150mil) package is available.
Function and Feature
• Monaural BTL power amplifier incorporated
Standard output power 1 = 450mW (VCC = 3.6V, RL = 8Ω, THD = 10%)
Standard output power 2 = 1000mW (VCC = 5V, 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.
80807 MS / 62707 MS PC / 41807 MS PC 20070313-S00013 No.A0743-1/11
LV4991TH
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Symbol
Conditions
Ratings
Unit
VCC max
Pd max
Substrate mounted*
6
V
1.1
V
Operating temperature
Topr
-40 to +85
°C
Storage temperature
Tstg
-40 to +150
°C
* Substrate mounted : with 60mm × 60mm × 1.6mm, glass epoxy substrate
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended supply voltage
VCC
Recommended load resistance
RL
Allowable operating supply
Conditions
Ratings
VCC op
Unit
3.6
V
8 to 32
Ω
2.7 to 5.5
V
voltage range
* 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
Quiescent current drain
Stand-by current drain
ICCOP
No signal, RL = ∞
ISTBY
No signal, RL = ∞, V3 = LOW
typ
Unit
max
3.6
6
0.1
10
mA
µA
Maximum output power 1
POMX1
THD = 10%
300
450
mW
Maximum output power 2
POMX2
THD = 10%, VCC = 5V
665
1000
mW
VIN = -30dBV
4.5
6
Voltage gain
VG
Voltage gain use range
VGR
Total harmonic distortion ratio
THD
Output noise voltage
VNOUT
Ripple removal ratio
SVRR
Output offset voltage
V OS
0
7.5
dB
26
dB
%
VIN = -30dBV
0.3
1
Rg = 620Ω, 20 to 20kHz
120
280
µVrms
50
mV
Rg = 620Ω, fr = 100Hz, Vr = -20dBV
48
Rg = 620Ω
-50
1.9
Reference (pin 1) voltage
VREF
Pin 3 control HIGH voltage
VSTBH
Power amplifier operation mode
Pin 3 control LOW voltage
VSTBL
Power amplifier standby mode
Pin 2 control HIGH voltage
VCNTH
Second power amplifier operation mode
Pin 2 control LOW voltage
VCNTL
Second power amplifier standby mode
dB
1.81
V
VCC
V
0
0.3
V
1.6
VCC
V
0
0.3
V
No.A0743-2/11
LV4991TH
Package Dimensions
3.0
0.75
0.7
6
0.5
3.0
4.9
8
1 2
0.2
0.5
(0.85)
1.1MAX
(0.5)
0.125
Allowable power dissipation, Pd max – mW
unit : mm (typ)
3339
Pd max – Ta
1400
Specified circuit board : 60×60×1.6mm3
glass epoxy board
1300
1200
1100
Specified substrate (Both sides)
1000
900
800
700
600
570
500
400
300
200
Independent IC
100
0
– 40
– 20
0
20
40
60
80
100
0.08
Ambient temperature, Ta – °C
SANYO : HMSOP8(150mil)
Recommended substrate
Size : 60mm×60mm×1.6mm
Top Layer
Bottom Layer
No.A0743-3/11
LV4991TH
Block Diagram and Sample Application Circuit
INPUT
C3
0.33µF
C4
1µF
1
R1
22kΩ
VREF
VCC
IN
AMP1
8
+
R2
22kΩ
R3 STBY
10kΩ
2
7
CONTROL
VCC
BIAS
3
4
5
OUT2
+
-
OUT1
AMP2
C2
0.1µF
VCC
+ C1
2.2µF
6
RADIATOR
FIN
from CPU
CNT
R4
10kΩ
TSD
from CPU
GND
SPEAKER
Test Circuit
620Ω
VIN
0.33µF
1µF
22kΩ
1 VREF
IN 8
10kΩ
VCNT
10kΩ
VSTBH
2 CNT
3 STBY
VSTBL
4 OUT2
LV4991TH
22kΩ
VCC 7
0.1µF
+
2.2µF
VCC
OUT1 6
RADIATOR
FIN
5 GND
8Ω
No.A0743-4/11
LV4991TH
Pin Description
Pin voltage
Pin No.
8
Symbol
IN
Description
VCC = 3.6V
1.81
Equivalent circuit
Input pin
VCC
8
3kΩ
3
STBY
Voltage
impression
+
Standby pin
•Standby mode at 0 to 0.3V
VCC
•Operation mode at 1.9 to VCC
21kΩ
1
VREF
1.81
40.7kΩ
121.4kΩ
3
GND
Ripple filter pin
(For connection of capacitor for filter)
100kΩ
VCC
VCC
450kΩ
101kΩ
1
GND
2
CNT
Voltage
Second amplifier stop control pin
impression
•Second amplifier stopped at 0 to
VCC
20µA
0.3V
11kΩ
100kΩ
2
4
OUT2
6
OUT1
1.81
GND
Power amplifier output pin
VCC
4
+
6
10kΩ
5
GND
0
Ground pin
7
VCC
Voltage
Power pin
impression
(3.6)
No.A0743-5/11
LV4991TH
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 1 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 2 control (second amplifier stop control function)
Pin 2 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 2 can be controlled by applying the voltage described below :
Second amplifier ON ⇒ V2 = 1.6 to VCCV or OPEN
Second amplifier OFF ⇒ V2 = 0 to 0.3V
When the pin-1 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 3:STBY
Pin 2:CNT
C4 [µF]
0.1
0.22
0.33
Tmu [ms]
≥ 170
≥ 270
≥ 280
Between pins 6 and 4:
OUT1-OUT2
AMP2:ON
Tmu
time
Fig. 1
4. Standby pin (pin 3)
By controlling the standby pin, the mode changeover can be made between standby and operation modes.
Standby mode ⇒ V3 = 0 to 0.3V
Operation mode ⇒ V3 = 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
3
Fig. 2
No.A0743-6/11
LV4991TH
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.A0743-7/11
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
