The LA4450 is a single package 2-channel power Amplifier that supports an operating voltage of 26V. It is particularly
well suited for use as the bus and track power IC in car stereo applications. Additionally, since the LA4450 can drive 4
loads, it can be used effectively in high-power high-end products. Furthermore, since it supports a high operating
voltage and has low distortion, it is also optimal for use in TV and home audio products.
Features
Two channels in a single package
PO = 12W2 (VCC = 26.4V, RL = 8, THD = 10%)
PO = 20W2 (VCC = 26.4V, RL = 4, THD = 10%)
Can drive 4 speakers
Built-in standby switch
Minimizes impulse noises
Functions
Standby switch (active on high (+5V) input)
On-chip impulse noise protection circuit
On-chip thermal protection circuit
On-chip overvoltage and surge protection circuits
SIP14 36.8x13.8 / SIP14H
Specifications
Maximum Ratings
at Ta = 25C
Parameter
Maximum supply voltage
Maximum output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
IO peak
Pd max
Topr
Tstg
Infinite heat sink*
Conditions
Rg = 0 (no signal)
Ratings
37
4
25
35
to
80
40
to
150
Unit
V
A
W
C
C
Note : * Set VCC and RL within ranges that do not cause Pd max to exceed 25W.
(When VCC is 37V, RL should be 6 or larger and when VCC is 35V, RL should be 4 or larger.)
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
Operating Conditions
at Ta = 25C
Parameter
Recommended supply voltage
Recommended load resistance
Operating supply voltage range
Symbol
VCC
RL
VCC op
Conditions
Ratings
26.4
8
10 to 30
Unit
V
V
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
ORDERING INFORMATION
See detailed ordering and shipping information on page 8 of this data sheet.
Semiconductor Components Industries, LLC, 2013
July, 2013
D1912NK Pd B8-0618/91708 MS JK/43098HA(OT)/10794TS/1102 No.4090-1/8
LA4450
Electrical Characteristics
at Ta = 25C, VCC = 26.4V, RL = 8, f = 1kHz, Rg = 600
Parameter
Standby current
Quiescent current
Output power
Ist
ICCO
PO1
PO2
Voltage gain
Total harmonic distortion
Output noise voltage
Ripple exclusion ratio
Channel separation
Standby control voltage
VG
THD
VNO
SVRR
CHsep
Vst
Symbol
Conditions
Standby switch off
Rg = 0
THD = 10%
THD = 10%, RL = 4
VO = 0dBm
PO = 1W
Rg = 0, BPF-BW = 20Hz to 20kHz
Rg = 0, fR = 100Hz, VR = 0dBm
VO = 0dBm, Rg = 10k
With a 10k resistor connected at pin 12
45
45
2.5
49
50
10
Ratings
min
typ
1
80
12
20
51
0.07
0.4
55
55
VCC
53
0.4
1.0
max
30
140
Unit
A
mA
W
W
dB
%
mV
dB
dB
V
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be
indicated by the Electrical Characteristics if operated under different conditions.
32
Pd max -- Ta
Using silicon grease
Heat sink attached with
a torque of 39N cm
Allowable power dissipation, Pd max -- W
28
25
24
21
20
16
12
11
8
5
4
3.5
Infinite heat sink
200
x
200
x
1.5mm
3
Al
100
x
100
x
1.5mm
3
Al
50
x
50
x
1.5mm
3
Al
Independent IC
0
20
40
60
80
100
120
140
160
0
-35 -20
Ambient temperature, Ta --
°C
No.4090-2/8
LA4450
Package Dimensions
unit : mm
SIP14 36.8x13.8 / SIP14H
CASE 127AQ
ISSUE A
GENERIC
MARKING DIAGRAM*
XXXXXXXXXX
YMDDD
XXXXX = Specific Device Code
Y = Year
M = Month
DDD = Additional Traceability Data
*This information is generic. Please refer to
device data sheet for actual part marking.
No.4090-3/8
LA4450
Test Circuit
VCC=26.4V
+
100μF
10
DC
IN1
7
VCC
BS1 6
9
8
+
100μF
+
IN1
NF1
−
CH1
OUT1
5
+ 47μF
+
1000μF
*
RL=8Ω
+
1000μF
0.15μF
2.2Ω
CH1
PWR 4
GND
PRE
11 GND
LA4450
CH2
PWR 3
GND
+
47μF
+
1000μF
*
RL=8Ω
IN2
BS2 1
13
14
+
100μF
ST
12
IN2
NF2
+
−
CH2
OUT2
2
0.15μF
2.2Ω
OFF
ON
10kΩ
+
5V
*Polyester
Film Capacitor
1. Features and Usage Notes
Pin 12 is the standby pin. The IC operates when a voltage of 2V or higher is applied through the external resistor R1.
Note that the maximum influx current to pin 12 is 500A.
Changing the voltage gain
The voltage gain VG can be lowered by connecting an
external resistor in series between the NF pin (pins 8 and 14)
IN
+
and CNF.
OUT
75Ω
NF
RNf’
+
CNF
30KΩ
−
VG = 20log
30k
75RNf ’
However, since the IC may oscillate if VG is 30dB or lower,
use a VG of 36dB or higher.
The LA4450 includes a thermal protection circuit to prevent damage to or destruction of the IC due to abnormal
overheating. As a result, the output may be attenuated or cut off if the application heat sinking is inadequate.
The LA4450 includes an overvoltage protection circuit to protect the IC against power supply surges and abnormal
voltages. This circuit has hysteresis characteristics : it operates at between 39 and 40V, and recovers at around 34V.
Although the LA4450 includes a current limiter circuit to prevent damage due to abnormal currents, care must still be
exercised to prevent load shorts and other excessive current conditions.
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