EN3309 D
Ordering number : EN3309D
LA4425A
Monolithic Linear IC
5W Power Amplifier
with Very Few External Parts
for Car Radio and Car Stereo
http://onsemi.com
Overview
The LA4425A 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
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Surge maximum supply voltage
Symbol
VCC max
VCC surge
Conditions
Ratings
Unit
Rg = 0
18
V
Giant pulse 200ms
50
V
Rise time 1ms
Maximum output current
IO peak
Allowable power dissipation
Pd max
With infinite heat sink
3.3
A
7.5
W
Operating temperature
Topr
-30 to +80
°C
Storage temperature
Tstg
-40 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
June, 2013
53007 MS PC/53096HA(II)/20293TS/9200TA,TS(KOTO)/3050TA,TS(AF) No.3309-1/9
LA4425A
Operating Conditions at Ta = 25°C,
Parameter
Symbol
Recommended supply voltage
VCC
Recommended load resistance
RL
Operating voltage range
Conditions
Ratings
VCC op
Operating load resistance range
RL op
Unit
13.2
V
4
Ω
5 to 16
V
2 to 8
Ω
Under conditions where maximum ratings are
not exceeded
Electrical Characteristics at Ta = 25°C, VCC = 13.2V, RL = 4Ω, f = 1 kHz, Rg = 600Ω,
specified board/specified circuit, 30×30×1.5mm3 thick aluminum used
Ratings
Parameter
Symbol
Conditions
Unit
min
Quiescent current
typ
ICCO
max
65
130
mA
43
45
47
dB
13.2 V / 4Ω, THD = 10%
4
5
PO2
14.4 V / 4Ω, THD = 10%
5
THD
VO = 2V
Voltage gain
VG
VO = 0dBm
Output power
PO1
Total harmonic distortion
Output noise voltage
VNO
Rg = 0, BPF = 20 Hz to 20 kHz
30
40
dB
Ripple rejection ratio
SVRR1
Rg = 0, BPF = 20 Hz to 20 kHz
30
40
dB
47
dB
21.5
V
0.35
s
W
6
W
0.1
1.0
%
VR = 0dBm, fR = 100Hz
SVRR2
Rg = 0, BPF = 20 Hz to 20 kHz
VR = 0dBm, fR = 100 Hz
Over-voltage attack
VCCX
Starting time
Rg = 0
tS
Input resistance
Roll-off frequency
Thermal operating temperature
RIN
50
fL
40
kΩ
Hz
fH
90
kHz
Tc
125
°C
Package Dimensions
unit : mm (typ)
3031C
Pd max -- Ta
Allowable power dissipation, Pd max -- W
10
9.5
2.7
3.2
0.51min
1.1
1.5
10.0
14.25max
13.0
(11.8)
(2.0)
(2.0)
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
80
100
Ambient temperature, Ta -- °C
(0.75)
1
5
2.0
0.6
0.5
1.2
SANYO : SIP5H
No.A0195-2/9
LA4425A
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
LA4425A
+
4
2
speaker
4Ω
3
Pin Voltage at VCC = 13.2V
Characteristics
Input
Pin No.
1
Pin voltage
(reference value)
(≈ 2VBE)
Small signal
Large signal
GND
GND
2
3
0V
1.4V
0V
Output
VCC
4
5
(≈ 1/2VCC)
(VCC)
13.2V
6.5V
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
LA4425A
Output coupling capacitor
External Parts


Input coupling capacitor


Bootstrap capacitor

-
Feedback capacitor

-
Filter capacitor

-
Phase compensation capacitor

-

-
Oscillation correction polyester
film capacitor
Oscillation correction resistor
Total

-
8 pcs.
2 pcs.
Note: The power supply capacitor is not counted as a power IC part.
No.A0195-3/9
LA4425A
Sample Printed Circuit Pattern
LA4425A
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
-1
-2
fL
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
Frequency, f -- Hz
5
10k
2 3
5 100k
Total harmonic distortion, THD -- %
3
-4
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
1.0
VCC=13.2V
RL=4Ω
Rg=600Ω
VO=2V(PO=1W)
7
5
3
2
0.1
7
5
3
3
5
7 100
2
3
5
7 1k
2
3
5
Frequency, f -- Hz
No.A0195-4/9
LA4425A
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
RL=2Ω
f=1kHz
Rg=600Ω
ICC
10
8
VCC=16V
600
400
VNO -- Rg
0.6
0.5
0.4
0.3
0.2
0.1
2
3
5
2
3
5
7 100k
Signal source resistance, Rg -- Ω
2
2
3
5
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
VCC=13.2V
RL=4Ω
BPF=20Hz to 20kHz
Rg=0→0.12mV
1k
6
Output power, PO -- W
0.7
0
7
20
800
0
7 0.1
0
10
Ripple rejection ratio, SVRR -- dB
0.8
18
200
1000
Power supply ripple, VR -- mVrms
1200
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
Power dissipation, Pd -- W
Total harmonic distortion, THD -- %
5
40
30
20
VCC=13.2V
RL=4Ω
Rg=0
VR=0dBm
BPF=20Hz to 20kHz
10
0
0
5
7
100
2
3
5
7
1k
2
Ripple frequency, fR -- Hz
No.A0195-5/9
LA4425A
ICCO -- Ta
VCC=13.2V
RL=4Ω
Rg=0
60
40
20
0
-60
-40
-20
0
20
40
8
60
80
4
2
0
-60
100
-40
-20
0
20
40
60
80
100
Ambient temperature, Ta -- °C
PO -- Ta
6
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
Ambient temperature, Ta -- °C
0.2s/div
VCC=13.2V/4Ω
Rg=0
"OFF"locus
2V/div
Output power, PO -- W
VCC=13.2V
RL=4Ω
Rg=0
6
Ambient temperature, Ta -- °C
5
VN -- Ta
10
Output pin voltage, VN -- V
Quiescent current, ICCO -- mA
80
GND
0.2s/div
No.A0195-6/9
LA4425A
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
+
LA4425A
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
LA4425A
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.
No.A0195-7/9
LA4425A
• Load Resistance and Misoperation
It should be noted that when RL < 2Ω 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
+
LA4425A
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 LA4425A 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 50kΩ. 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)
No.A0195-8/9
LA4425A
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.
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.
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of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at
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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
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PS No.3309-9/9
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