LA4425AN D
LA4425AN
Monolithic Linear IC
5W Power Amplifier
with Very Few External Parts
for Car Radio and Car Stereo
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Overview
The LA4425AN is a 5W power amplifier with very few external parts.
The smallest package in the industry [SIP-5H(TO-126 type)]. Only two
external parts (Only I/O coupling capacitors). Almost no evaluation,
adjustment and check of its functions as a power IC required and
simplified control.
Functions
 Wide operation supply range : 5 to 16V
 On-chip protection :
- Over-voltage protection
- Thermal protection
- Output D.C. short protection
 On-chip pop noise reducing circuit
SIP5 9.5x11.8 / SIP5H
Specifications
Maximum Ratings at Ta = 25C
Parameter
Maximum supply voltage
Surge maximum supply
voltage
Maximum output current
Symbol
VCC max
VCC surge
Allowable power dissipation
IO peak
Pd max
Rg = 0
Conditions
18
Unit
V
Giant pulse 200ms
Rise time 1ms
50
V
3.3
A
With infinite heat sink
Ratings
7.5
W
Operating temperature
Topr
40 to +85
C
Storage temperature
Tstg
40 to +150
C
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.
ORDERING INFORMATION
See detailed ordering and shipping information on page 10 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
September 2014 - Rev. 0
1
Publication Order Number :
LA4425AN/D
LA4425AN
Operating Conditions at Ta = 25C,
Parameter
Recommended supply
voltage
Recommended load
resistance
Operating voltage range
Operating load resistance
range
Symbol
Conditions
Ratings
VCC
Unit
13.2
V
4

RL
VCC op
RL op
Under conditions where maximum
ratings are not exceeded
5 to 16
V
2 to 8

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.
Electrical Characteristics at Ta  25C, VCC = 13.2V, RL = 4, f = 1 kHz, Rg = 600,
specified board/specified circuit, 30301.5mm3 thick aluminum used
Parameter
Quiescent current
Symbol
Conditions
130
mA
47
dB
13.2 V / 4, THD = 10%
4
5
14.4 V / 4, THD = 10%
5
PO1
Total harmonic distortion
PO2
THD
Output noise voltage
VNO
Ripple rejection ratio
SVRR1
Rg = 0, BPF = 20 Hz to 20 kHz
VR = 0dBm, fR = 100Hz
SVRR2
Rg = 0, BPF = 20 Hz to 20 kHz
VR = 0dBm, fR = 100 Hz
Rg = 0
Roll-off frequency
Thermal operating
temperature
Unit
65
Output power
VCCX
max
45
VO = 0dBm
Input resistance
typ
43
VG
Starting time
min
ICCO
Voltage gain
Over-voltage attack
Ratings
VO = 2V
Rg = 0, BPF = 20 Hz to 20 kHz
tS
W
6
0.1
W
1.0
%
30
40
dB
30
40
dB
47
dB
21.5
V
0.35
s
RIN
50
fL
fH
40
k
Hz
90
kHz
Tc
125
C
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.
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2
LA4425AN
Pd max -- Ta
Allowable power dissipation, Pd max -- W
10
Al heat sink
mounting toque 39N.cm
with sillicone grease applied.
8
7.5
Infinite heat sink
12
°C
/
W
6
5.7
100×100×1.5mm3
50×50×1.5mm3
4.3
4
2.9
2
30×30×1.5mm3
No heat sink
1.2
0
-30 -20
0
20
40
60
Ambient temperature, Ta -- °C
Package Dimensions
unit : mm
SIP5 9.5x11.8 / SIP5H
CASE 127AF
ISSUE O
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3
80
100
LA4425AN
Sample Application Circuit
VCC 13.2V
+
+
5
Ci 2.2μF
 On-chip overvoltage protection
 On-chip thermal protection
 On-chip pop noise reducing circuit
 On-chip output D.C. short protection
1000μF
1
Co 1000μF
LA4425AN
+
4
2
speaker
4Ω
3
Pin Voltage at VCC = 13.2V
Characteristics
Small signal
GND
2
Input
Pin No.
1
Pin voltage
(reference value)
( 2VBE)
1.4V
Large signal
GND
3
0V
0V
Output
VCC
4
5
( 1/2VCC)
6.5V
(VCC)
13.2V
IC Usage Notes
Maximum ratings
If the IC is used in the vicinity of the maximum ratings, even a slight variation in conditions may cause the maximum
ratings to be exceeded, thereby leading to a breakdown.
Printed circuit board
When drawing the printed circuit pattern, refer to the sample printed circuit pattern. Be careful not to form a feedback
loop between input and output.
Comparison of External Components
Our ICs now in use
LA4425AN
Output coupling capacitor
External Parts


Input coupling capacitor


Bootstrap capacitor

-
Feedback capacitor

-
Filter capacitor

-

-

-

-
8 pcs.
2 pcs.
Phase compensation
capacitor
Oscillation correction
polyester film capacitor
Oscillation correction
resistor
Total
Note: The power supply capacitor is not counted as a power IC part.
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4
LA4425AN
Sample Printed Circuit Pattern
LA4425AN
GND
CVCC=1000μF
−
5
1
+
VCC
+
−
OUT
−
IN
+
Co=1000μF
Ci=2.2μF GND
Cu-foiled side 78.0 29.0mm2
ICCO -- VCC
100
RL=4Ω
Rg=0
10
80
Output pin voltage, VN -- V
Quiescent current, ICCO -- mA
VN -- VCC
12
60
40
20
RL=4Ω
Rg=0
8
6
4
2
0
0
2
4
6
8
10
12
14
16
18
20
22
0
0
24
2
4
6
Supply voltage, VCC -- V
Output power, PO -- W
3
2
PO -- VIN
10
VCC=13.2V
RL=4Ω
f=1kHz
Rg=600Ω
7
Total harmonic distortion, THD -- %
10
7
5
1.0
7
5
3
2
0.1
7
5
3
2
1.0
8
14
16
18
20
22
24
5
3
5
7
10
7 10k
2
3
THD -- PO
2
1.0
7
5
3
2
0.1
7
2
3
5
7
10
2
3
5
7
5
5
100
7
0.1
2
3
0
2
Total harmonic distortion, THD -- %
3
-1
-2
fL
-4
fH
-5
-6
-7
VCC=13.2V
RL=4Ω
Rg=600Ω
VO=0dBm
-8
-9
2 3
5
100
2 3
5
1k
2 3
7
2
1.0
3
THD -- f
1
-3
5
Output power, PO -- W
f Response
Response -- dB
12
VCC=13.2V
RL=4Ω
f=1kHz
Rg=600Ω
Input voltage, VIN -- mV
-10
10
10
Supply voltage, VCC -- V
5
10k
2 3
1.0
VCC=13.2V
RL=4Ω
Rg=600Ω
VO=2V(PO=1W)
7
5
3
2
0.1
7
5
3
3
5 100k
Frequency, f -- Hz
5
7 100
2
3
5
7 1k
2
3
Frequency, f -- Hz
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5
5
LA4425AN
THD -- VCC
12
RL=4Ω
f=1kHz
VO=2V(PO=1W)
Rg=600Ω
3
2
10
Output power, PO -- W
1.0
7
5
3
2
PO -- VCC
f=1kHz
Rg=600Ω
THD=10%
RL=2Ω
RL=4Ω
8
6
4
2
0.1
7
5
6
8
10
12
14
16
18
0
8
20
10
12
Supply voltage, VCC -- V
7
RL=4Ω
f=1kHz
Rg=600Ω
ICC
6
500
5
VCC=16V
400
300
VCC=13.2V
4
3
200
2
100
1
0
7
2
0.1
3
5
7
2
1.0
3
5
1200
7
1000
Current drain, ICC -- mA
Current drain, ICC -- mA
600
ICC, Pd -- PO
Power dissipation, Pd -- W
700
0.8
RL=2Ω
f=1kHz
Rg=600Ω
ICC
10
8
VCC=16V
600
400
VNO -- Rg
0.5
0.4
0.3
0.2
0.1
3
5
2
3
5
7 100k
Signal source resistance, Rg -- Ω
2
2
3
5
Ripple rejection ratio, SVRR -- dB
20
VCC=13.2V
RL=4Ω
fR=100Hz
Rg=0
BPF=20Hz to 20kHz
200
400
600
800
3
5
7
0
2
10
SVRR -- VCC
30
20
RL=4Ω
VR=0dBm
fR=100Hz
Rg=0
BPF=20Hz to 20kHz
10
9
10
11
12
13
14
15
16
17
18
19
SVRR -- fR
50
30
0
0
2
Supply voltage, VCC -- V
40
10
7 1.0
40
0
8
2
SVRR -- VR
50
Ripple rejection ratio, SVRR -- dB
7 10k
4
VCC=13.2V
50
0.6
2
6
Output power, PO -- W
VCC=13.2V
RL=4Ω
BPF=20Hz to 20kHz
Rg=0→0.12mV
1k
20
800
0
7 0.1
0
10
0.7
0
7
18
200
Ripple rejection ratio, SVRR -- dB
Output noise voltage, VNO -- mV
0.9
16
ICC, Pd -- PO
Output power, PO -- W
1.0
14
Supply voltage, VCC -- V
1000
40
30
20
0
0
1200
VCC=13.2V
RL=4Ω
Rg=0
VR=0dBm
BPF=20Hz to 20kHz
10
Power supply ripple, VR -- mVrms
5
7
100
2
3
5
Ripple frequency, fR -- Hz
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6
7
1k
2
Power dissipation, Pd -- W
Total harmonic distortion, THD -- %
5
LA4425AN
ICCO -- Ta
VCC=13.2V
RL=4Ω
Rg=0
60
40
20
0
-60
-40
-20
0
20
40
VN -- Ta
10
8
Output pin voltage, VN -- V
Quiescent current, ICCO -- mA
80
60
80
VCC=13.2V
RL=4Ω
Rg=0
6
4
2
0
-60
100
Ambient temperature, Ta -- °C
0
20
40
60
80
100
Ambient temperature, Ta -- °C
VCC=13.2V
RL=4Ω
f=1kHz
THD=10%
VCC=13.2V/4Ω
Rg=0
Switch"ON"locus
ts
2V/div
4
3
2
1
GND
0
-60
-40
-20
0
20
40
60
80
100
0.2s/div
Ambient temperature, Ta -- °C
VCC=13.2V/4Ω
Rg=0
"OFF"locus
2V/div
Output power, PO -- W
-20
PO -- Ta
6
5
-40
GND
0.2s/div
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LA4425AN
Instructions and Precautions
 Connect a capacitor of 1000pF across pins  and  for external disturbance path.
 Be careful of the ground line artwork when laying out the printed circuit pattern. Arrange so that the Sg route and load
current flow-in route do not overlap. Refer to the recommended printed circuit pattern or make slits, etc. at pins 
and .
DUAL Printed Circuit Pattern Example
GND
OUT1
1
IN1
GND
VCC
IN2
1
OUT2
Cu-foiled side 45.0×75.0mm2
 Short Circuit Tests
SW1
+
SW3
+
13.2V
+
LA4425AN
SW2
SW4
Our company's recommended printed circuit board: Apply VCC=13.2V using a 30301.5mm3 thick aluminum board.
The IC will be protected from the DC/AC shorting of switches 1 to 4 above. However, be careful not to damage the IC
by turning VCC ”ON” when DC short (SW 1 or SW 2) is on.
 Power Supply Positive Surge
JASO tester
Application of giant pulse
2.2μF
0.15μF
+
Rg
620Ω
LA4425AN
13.2V
+
1000μF
RL
The over-voltage protector (VCCX  21.5V) inside the IC is used to cut all bias routes and reverse bias between B-E of
output stage elements, in order to increase the power line’s capability of handling positive surge. This means, of course,
that a VCES (VCBO) type output stage element is used instead of the VCEO (VCER) type.
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LA4425AN
 Load Resistance and Misoperation
It should be noted that when RL  2 and VCC is high, and the switch is turned “ON” when setting is for a signal
(THD = 10%), the ground detector (current  voltage Schmitt circuit) operates momentarily.
 Precautions on TaB
If power voltage is applied to the IC substrate (the heat sink on a set), the IC structure is such that the PN junctions
may be burned, causing deterioration or destruction. Consult Our company’s Quality Assurance Department with
regard to the energy handling capability (voltage peak value, pulse width). Also, the IC TaB (substrate) is connected
to pin 3, large signal GND.
 Test of +VCC to Output Pin
Floating
+
+
b
+
LA4425AN
13.2V
a
The power pin is in a floating state when a power capacitor is connected, so if +VCC touches output lines a and b , the
upper power transistor inside the IC will be damaged.
The LA4425AN has a protective bypass route inside the IC.
 Starting Time (ts)
This is set at 0.35sec/typ, but it can be made shorter by making input capacitor Ci smaller, or longer by making it
larger.
 Pop noise
The pop noise prevention circuit operates to reduce pop until Rg reaches 50k. However, if Rg is left open, the
charging route of input capacitor Ci is lost, so the pop noise reduction circuit stops operating and click noises become
louder.
 VG/OSC
The voltage gain is fixed at 45dB inside the IC. It is impossible to change it externally.
Phase compensation capacitors (350pF/total) are connected between individual stages inside the IC, and the open
loop gain is low. In addition, the upper and lower drives are made equivalent so that final stage current gain is
adjusted, providing a measure against unwanted high-frequency parasitic oscillation peculiar to power IC’s.
 BTL Connection
Connection is impossible with IC alone.
 Reverse Mounting of IC
The pin assignment is such that there is no danger of damage.
ICC,PO
 T.S.D (Thermal Shutdown) Operating Temperature
30×30×1.5mm3 thick Al board
Ta=25°C
0
20
40
60
80
100
120
140
160
180
Tc (°C)
T.S.D is capable of starting operation at Tc 120 to 130C. When this is converted to junction temperature (Tj) according
to the formula below.
Tj  165C,
Tj = Qjc.Pd + Tc
As T.S.D operation progresses, the output pin bias voltage drops, and it becomes harder to drive the upper waveform.
Therefore, the current (ICC) and power (PO) show a tendency to decrease.
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LA4425AN
Proper Cares in Mounting Radiator Fin
1. The mounting torque is in the range of 1. The mounting torque is in the range of 39 to 59 N.cm.
2. The distance between screw holes of the radiator fin must coincide with the distance between screw holes of the IC.
3. The screw to be used must have a head equivalent to the one of truss machine screw or binder machine screw
defined by JIS. Washers must be also used to protect the IC case.
4. No foreign matter such as cutting particles shall exist between heat sink and radiator fin. When applying grease on
the junction surface, it must be applied uniformly on the whole surface.
5. Because the heat sink mounting tab and the heat sink are at the same electric potential as the chip’s GND, care must
be taken when mounting the heat sink on more than one device.
6. IC lead pins are soldered to the printed circuit board after the radiator fin is mounted on the IC.
ORDERING INFORMATION
Device
LA4425AN-D-E
Package
SIP5 9.5x11.8 / SIP5H
(Pb-Free)
Shipping (Qty / Packing)
50 / Fan-Fold
ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States
and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of
SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf . SCILLC reserves the right to make changes without
further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose,
nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including
without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can
and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are
not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or
sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers,
employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of,
directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was
negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all
applicable copyright laws and is not for resale in any manner.
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