IL386

TECHNICAL DATA
IL386
Low Voltage Audio Power AMP
The IL386 is a power amplifier designed for use in low
voltage consumer applications. The gain is internally set to 20 to
keep external part count low, but the addition of an external
resistor and capacitor between pins 1 and 8 will increase the
gain to any value up to 200.
The inputs are ground referenced while the output is
automatically biased to one half the supply voltage. The
quiescent power drain is only 24 mW when operating from a
6 volt supply, making the IL386 ideal for battery operation.
FEATURES









Battery Operation
Minimum External Parts
Wide Supply Voltage Range: 4 V - 12 V
Low Quiescent Current Drain: 4 mA
Voltage Gains from 20 to 200
Ground Referenced Input
Self-Centering Output Quiescent Voltage
Low Distortion
Eight Pin Dual-In-Line Package
ORDERING INFORMATION
IL386N Plastic
IL386D SOIC
TA = 0 to 70 C for all package
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
Packing
IL386N
IL386D
IL386DT
TA = 0 to 70 C
DIP-8
SO-8
SO-8
Tube
Tube
Tape & Reel
SCHEMATIC DIAGRAM
PIN ASSIGNMENT
2012, February, Ver. 03
IL386
MAXIMUM RATINGS
*
Symbol
Parameter
Value
Unit
15
V
VCC
Supply Voltage
VIN
Input Voltage
0.4
V
PD
Power Dissipation
1.25
W
Tstg
Storage Temperature
-65 to +150
C
TJ
Junction Temperature
+150
C
TL
Lead Temperature
+300
C
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Temperature, All Package Types
Min
Max
Unit
4.0
12
V
0
+70
C
This device contains protection circuitry to guard against damage due to high static voltages or
electric fields. However, precautions must be taken to avoid applications of any voltage higher than
maximum rated voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be
constrained to the range GND  (VIN or VOUT)  VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC).
Unused outputs must be left open.
ELECTRICAL CHARACTERISTICS (TA = 25C)
Symbol
Parameter
Test Conditions
Guaranteed Limits
Min
+
Operating Supply
Voltage
+
Quiescent Current
V
I
4
+
V = 6 V, VIN = 0
+
250
500
325
1000
+
24
44
26
46
+
250
PO
Output Power
V = 6V, RL =8, THD=10%
+
V = 9V, RL =8, THD=10%
AV
Voltage Gain
V = 6V, f=1kHz
10F from Pin 1 and 8
BW
Bandwidth
V = 6V, Pins 1 and 8 Open
THD
PSRR
RIN
IB
V = 6V, RL =8, POUT=125mW,
f=1kHz,
Pins 1 and 8 Open
Power Supply Rejection
Ratio
V = 6V, f=1kHz, CBYPASS=10F,
Pins 1 and 8 Open
V = 6V, Pins 2 and 3 Open
V
8
mA
mW
28
48
45
30
+
12
1.0
+
Input Resistance
Max
dB
KHz
+
Total Harmonic
Distortion
Input Bias Current
Typ
Unit
250
%
dB
130
K
400
nA
2012, February, Ver. 03
IL386
ELECTRICAL CHARACTERISTICS (TA = 0 ~ 70C)
Symbol
Parameter
Test Conditions
Guaranteed Limits
Min
+
Operating Supply
Voltage
+
Quiescent Current
V
I
4
+
V = 6 V, VIN = 0
+
220
480
325
1000
+
22
42
26
46
+
250
PO
Output Power
V = 6V, RL =8, THD=10%
+
V = 9V, RL =8, THD=10%
AV
Voltage Gain
V = 6V, f=1kHz
10F from Pin 1 and 8
BW
Bandwidth
V = 6V, Pins 1 and 8 Open
THD
PSRR
RIN
IB
V = 6V, RL =8, POUT=125mW,
f=1kHz,
Pins 1 and 8 Open
Power Supply Rejection
Ratio
V = 6V, f=1kHz, CBYPASS=10F,
Pins 1 and 8 Open
V = 6V, Pins 2 and 3 Open
V
8
mA
mW
30
50
45
20
+
12
1.5
+
Input Resistance
Max
dB
KHz
+
Total Harmonic
Distortion
Input Bias Current
Typ
Unit
250
%
dB
150
K
600
nA
APPLICATION INFORMATION
GAIN CONTROL
To make the IL386 a more versatile amplifier, two
pins (1 and 8) are provided for gain control. With
pins 1 and 8 open the 1.35 K resistor sets the
gain at 20 (26 dB). If a capacitor is put from pin 1
to 8, bypassing the 1.35 K resistor, the gain will
go up to 200 (46 dB). If a resistor is placed in
series with the capacitor, the gain can be set to
any value from 20 to 200. Gain control can also be
done by capacitively coupling a resistor (or FET)
from pin 1 to ground.
Additional external components can be placed in
parallel with the internal feedback resistors to tailor
the gain and frequency response for individual
applications. For example, we can compensate
poor speaker bass response by frequency shaping
the feeback path. This is done with a series RC
from pin 1 to 5 (paralleling the internal 15 K
resistor). For 6 dB effective bass boots: R15 K,
the lowest value for good stable operation is
R=10 K if pin 8 is open. If pins 1 and 8 are
bypassed then R as low as 2 K can be used.
This restriction is because the amplifier is only
compensated for closed-loop gains greater the 9.
INPUT BIASING
The schematic shows that both inputs are biased
to ground with a 50 K resistor. The base current
of the input transistors is about 250 nA, so the
inputs are at at out 12.5 mV when left open. If the
dc source resistance oriving the IL386 is higher
than 250 K it will contribute very little additional
offset (about 2.5 mV at the input, 50 mV at the
output). If the dc source resistance is less than
10 K, then shorting the unused input to ground
will keep the offset low (about 2.5 mV at the input,
50 mV at the output). For dc source resistances
between these values we can eliminate excess
offset by putting a resistor from the unesed input to
ground, equal in value to the dc source resistance.
Of course all affset problems are eliminated if the
input is capacitively coupled.
When using the IL386 with higher gains (by
pessing the 1.35 K resistor between pins 1 and
8) it is necessary to bypass the unused input,
preventing degradation of gain and possible
instabilities. This is done with a 0.1 F capacitor or
a short to ground depending on the dc source
resistance on the driven input.
2012, February, Ver. 03
IL386
TYPICAL PERFORMANCE CHARACTERISTICS
2012, February, Ver. 03
IL386
TYPICAL APPLICATION
2012, February, Ver. 03
IL386
N SUFFIX PLASTIC DIP
(MS – 001BA)
A
Dimension, mm
5
8
B
1
4
F
Symbol
MIN
MAX
A
8.51
10.16
B
6.1
7.11
C
L
C
5.33
D
0.36
0.56
F
1.14
1.78
-T- SEATING
PLANE
N
G
M
K
H
D
0.25 (0.010) M
J
T
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
G
2.54
H
7.62
J
0°
10°
K
2.92
3.81
L
7.62
8.26
M
0.2
0.36
N
0.38
D SUFFIX SOIC
(MS - 012AA)
Dimension, mm
A
8
5
B
H
1
G
P
4
D
K
MIN
MAX
A
4.8
5
B
3.8
4
C
1.35
1.75
D
0.33
0.51
F
0.4
1.27
R x 45
C
-T-
Symbol
SEATING
PLANE
J
F
0.25 (0.010) M T C M
NOTES:
1. Dimensions A and B do not include mold flash or protrusion.
2. Maximum mold flash or protrusion 0.15 mm (0.006) per side
for A; for B ‑ 0.25 mm (0.010) per side.
M
G
1.27
H
5.72
J
0°
8°
K
0.1
0.25
M
0.19
0.25
P
5.8
6.2
R
0.25
0.5
2012, February, Ver. 03