Ordering number : EN4090E

LA4450
Monolithic Linear IC

2-Channel, 26V, Power Amplifier http://onsemi.com

for Bus and Track in Car Stereo

Overview
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 = 12W2 (VCC = 26.4V, RL = 8, THD = 10%)
 PO = 20W2 (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 SIP14 36.8x13.8 / SIP14H
 On-chip overvoltage and surge protection circuits

Specifications
Maximum Ratings at Ta = 25C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VCC max Rg = 0 (no signal) 37 V
Maximum output current IO peak 4 A
Allowable power dissipation Pd max Infinite heat sink* 25 W
Operating temperature Topr 35 to 80 C
Storage temperature Tstg 40 to 150 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 = 25C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage VCC 26.4 V
Recommended load resistance RL 8 
Operating supply voltage range VCC op 10 to 30 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 = 25C, VCC = 26.4V, RL = 8, f = 1kHz, Rg = 600

Ratings
Parameter Symbol Conditions Unit
min typ max
Standby current Ist Standby switch off 1 30 A
Quiescent current ICCO Rg = 0 50 80 140 mA
Output power PO1 THD = 10% 10 12 W
PO2 THD = 10%, RL = 4 20 W
Voltage gain VG VO = 0dBm 49 51 53 dB
Total harmonic distortion THD PO = 1W 0.07 0.4 %
Output noise voltage VNO Rg = 0, BPF-BW = 20Hz to 20kHz 0.4 1.0 mV
Ripple exclusion ratio SVRR Rg = 0, fR = 100Hz, VR = 0dBm 45 55 dB
Channel separation CHsep VO = 0dBm, Rg = 10k 45 55 dB
Standby control voltage Vst With a 10k resistor connected at pin 12 2.5 VCC 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.

Pd max -- Ta
32
Using silicon grease
Allowable power dissipation, Pd max -- W

28
Heat sink attached with
Infinite heat sink a torque of 39N cm
25
24
200 x 200 x 1.5mm3Al
21
20

16

12 100 x 100 x 1.5mm3Al

11

8
50 x 50 x 1.5mm3Al
5
4
3.5
Independent IC
0
-35 -20 0 20 40 60 80 100 120 140 160
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 1000μF

10 7
DC VCC

BS1 6 + 47μF
IN1
9 + 1000μF
IN1 +
CH1 5 RL=8Ω
8 − OUT1
0.15μF
*
NF1
+ 2.2Ω
100μF
CH1
PWR 4
GND

PRE
LA4450 CH2
11 GND PWR 3
GND

+ 47μF
BS2 1
IN2
13 + 1000μF
IN2 +
CH2 2 RL=8Ω
14 − OUT2 *
NF2 0.15μF
+ 2.2Ω
100μF
ST
12

OFF

ON 10kΩ *Polyester Film Capacitor

+
5V

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 500A.
 Changing the voltage gain
The voltage gain VG can be lowered by connecting an
IN + external resistor in series between the NF pin (pins 8 and 14)
75Ω OUT and CNF.
NF −
30k
RNf’ VG = 20log
75RNf ’
+ 30KΩ
CNF
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.

No.4090-4/8
 LA4450
Application Circuit Example

26.4V
+ +
C1 100μF/35V C10 1000μF/35V
DC VCC
10 7

Ripple filter,
impulse noise
prevention circuit BS1 47μF/35V
IN1 Current limiter circuit +
6
9 + C9
1000μF/35V
IN1 CH1 +
5
NF1 C8 0.15μF
OUT1
8 − C7 RL=8Ω
+ 75Ω R3 2.2Ω
C2 100μF
6.3V 30kΩ 4

Power ground
Thermal
Bias Overvoltage shutdown
Pre-ground circuit protection circuit protection
circuit
11 Power ground
3
IN2 Current limiter circuit
13 +
OUT2 1000μF/35V
IN2 CH2 2 +
NF2 C5 0.15μF
14 − C4 C6 RL=8Ω
+ 75Ω 1 R2 2.2Ω
C3 100μF + 47μF
6.3V BS2 35V
30kΩ
Standby switch

12
ST
10kΩ
OFF R1

ON
+
5V C6, C7: 0.15μF ......mylar capacitors

No.4090-5/8
 LA4450
Printed Circuit Board Pattern Example

VCC

R1
+ +
C4 C9 +
C6 C7 + +
C2 C1 C3
+
C10

IN1 GND IN2 ST

+ +
C5 C8

R2 R3

OUT 2 OUT 1

GND
Copper foiled side 90×100mm2

PO -- VCC PO -- VCC
5 5
f = 1kHz f = 1kHz
3 VG = 51dB 3 VG = 51dB
Rg = 600Ω Rg = 600Ω
2 2
THD = 10% THD = 10%
Output power, PO -- W
Output power, PO -- W

RL = 8Ω RL = 4Ω
10 10

7 7
5 5

3 3

2 2

1.0 1.0
7 7
5 5
10 14 18 22 26 30 34 38 10 14 18 22 26 30 34 38
Supply voltage, VCC -- V Supply voltage, VCC -- V
THD -- PO THD -- PO
2 2
VCC = 26.4V VCC = 26.4V
10 RL = 8Ω 10 RL = 4Ω
Total harmonic distortion, THD -- %

Total harmonic distortion, THD -- %

7 VG = 51dB 7 VG = 51dB
5 Rg = 600Ω 5 Rg = 600Ω
3 3
2 2

1.0 1.0
7 7
5 5
3 3 f = 10kHz
2 2
f = 10kHz 100Hz
0.1 0.1
7 100Hz 7
5 1kHz 5 1kHz
3 3
2 2
7 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 7 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3
Output power, PO -- W Output power, PO -- W

No.4090-6/8
 LA4450
f Response SVRR -- fR
2 0
VCC = 26.4V VCC = 26.4V
0 RL = 8Ω Rg = 0
-10 RL = 8Ω

Ripple exclusion ratio, SVRR -- dB

VG = 51dB converted to 0dB. Rg = 600Ω
-2 VG = 51dB
-20 VCCR = 0dBm
-4
Response -- dB

-30
-6

-8 -40

-10
-50
-12 CH1
-60
-14
CH2
-70
-16

-18 -80
2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 5 7 100k 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 5
Frequency, f -- Hz Ripple frequency, fR -- Hz
SVRR -- VCCR ICCO -- VCC
0 140
VCC = 26.4V RL = 8Ω
RL = 8Ω Rg = 0
-10 120
Rg = 0
Ripple exclusion ratio, SVRR -- dB

Quiescent current, ICCO -- mA

VG = 51dB
-20 fR = 100Hz 100

-30 80

-40 60

-50 40

-60 20

-70 0

-80 -20
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 4 8 12 16 20 24 28 32 36 40 44
Ripple voltage, VCCR -- Vrms Supply voltage, VCC -- V
VNO -- VCC SEP -- f
1.0 -30
VG = 51dB VCC = 26.4V
RL = 8Ω RL = 8Ω
BPF = 20Hz to 20kHz Rg = 10kΩ
Output noise voltage, VNO -- mV

0.8
-40 VO = 0dBm
Rg = 10kΩ
Separation, sep -- dB

0.6
-50
CH2 CH1
0.4 Rg = 0
CH1 CH2
-60
0.2

-70
0

-0.2 -80
6 10 14 18 22 26 30 34 38 42 2 3 5 7 100 2 3 5 7 1k 2 3 5 7 10k 2 3 5 7100k
Supply voltage, VCC -- V Frequency, f -- Hz
VNO -- Rg Pd -- PO
1.2 3
VCC = 26.4V f = 1kHz
RL = 8Ω RL = 8Ω (dual)
BPF = 20Hz to 20kHz/--3dB 2
Output noise voltage, VNO -- mV

1.0
VG = 51dB 35V
Power dissipation, Pd -- W

30V
0.8
26.4V
10

0.6
7

0.4 5

0.2
3

0 2
5 7 1k 2 3 5 7 10k 2 3 5 7 100k 2 7 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3
Signal Source Resistance, Rg -- Ω Output power, PO -- W

No.4090-7/8
 LA4450
Pd -- PO PO -- Ta
5 5
f = 1kHz
RL = 4Ω (dual)
3
3 RL = 4Ω
30V
Power dissipation, Pd -- W

Output power, PO -- W
2
8Ω
.4V
26 10

10 7

5
7

5 3
VCC = 26.4V
2
f = 1kHz
3
THD = 10%
Rg = 600Ω
2 1.0
7 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 -40 -20 0 20 40 60 80 100
Output power, PO -- W Ambient temperature, Ta -- °C
VN -- Ta
20
35V Rg = 0
18

16
Output pin voltage, VN -- V

14 26.4V

12

10

6 11V
4

0
-40 -20 0 20 40 60 80 100
Ambient temperature, Ta -- °C

ORDERING INFORMATION
Device Package Shipping (Qty / Packing)
SIP14 36.8x13.8 / SIP14H
LA4450-E (Pb-Free) 15 / Fan-Fold
SIP14 36.8x13.8 / SIP14H
LA4450F-E (Pb-Free) 14 / Fan-Fold
SIP14 36.8x13.8 / SIP14H
LA4450L-E (Pb-Free) 15 / Fan-Fold

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PS No.4090-8/8