LOW VOLTAGE AUDIO AMPLIFIER S1T8602B
INTRODUCTION
8−DIP−300
The S1T8602B is the audio power amplifier available for low voltages.
S1T8602B supplies differential outputs for maximizing output swing at
low voltages. S1T8602B doesn’t need coupling capacitors to the
speaker. The gain of this amp is controlled easily by two external
resistors.
FEATURES
• Wide Supply Voltage (2 ~ 16V)
• Low Quiescent Supply Current (ICC = 2.7mA : Typ)
• Easy Gain Control
• Medium Output Power
PO = 250mW at VCC = 6V, RL = 32Ω, THD = 10%
• Minimum External Parts
• Various Load Impedance Range (8Ω ∼ 100Ω)
• Low Distortion
• Mute Function (lCC = 65µA: Typ)
ORDERING INFORMATION
Device Package Operating Temperature
S1T8602B01-D0B0 8−DIP−300
S1T8602B01-S0B0 8−SOP−225
8−SOP−225
− 20°C ~ +70°C
1
S1T8602B LOW VOLTAGE AUDIO AMPLIFIER
BLOCK DIAGRAM
INPUT(-)
INPUT(+)
2
1
-
Amp1
+
OUTPUT1
3
R
R
Vcc
PIN CONFIGURATION
4 BIAS CIRCUIT
8 5
RIPPLE
REJECTION
INPUT(+)
INPUT(-)
OUTPUT1
Vcc
GND
1
2
3
4
KA8602B
S1T8602B
-
Amp2
+
8
RIPPLE REJECTION
7
MUTE
6
OUTPUT2
5
GND
6
7
OUTPUT2
MUTE
2
LOW VOLTAGE AUDIO AMPLIFIER S1T8602B
PIN DESCRIPTION
Pin No Symbol Description
1 Input (+)
2 Input (−)
3 Output 1
4 V
CC
5 GND
6 Output 2
7 Mute
8 Ripple Rejection
Analog Ground for the amplifiers. A 1.0µF capacitor at this pin (with a 5.0µF capacitor at
pin 8) provides 52dB (Typ) of power supply rejection. Turn-on time of the circuit is affected
by the capacitor on this pin. This pin can be used as an alternative input.
Amplifier input. The input capacitor and resistor set low frequency roll-off and input
impedance. The feedback resistor is connected between this pin and output1.
The output of Amplifier 1. DC Level is (V
DC supply voltage (+2.0 — + 16V) is applied to this pin.
Ground pin.
The output of Amplifier 2. This signal is equal in amplitude, but 180° out of phase with that
at output1. The DC level is (VCC — 0.7V)/2.
This pin can be used to power down the IC to conserve power or for muting, or both.
When at a logic Low (0 to 0.8 volts), the S1T8602B is enabled for normal operation. When
at a logic High (2.0 to VCC volts), the IC is disabled. If Mute is open, that is equivalent to a
logic Low.
A capacitor at this pin increases power supply rejection, and affects turn-on time. This pin
can be left open if the capacitor at pin 1 is sufficient.
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Vale Unit
— 0.7V)/2.
CC
Supply Voltage
Output Current (output pin)
Maximum Voltage (input, Ripple rejection, Mute pin)
Applied Output Voltage (output pin) when disabled
Junction Temperature
V
V
I (MAX)
V
I
T
CC
O
O
J
− 1.0 ~ + 18 V
± 250 mA
− 1.0 ~ VCC + 1.0 V
− 1.0 ~ VCC + 1.0 V
− 55 ~ + 140 °C
3
S1T8602B LOW VOLTAGE AUDIO AMPLIFIER
RECOMMENDED OPERATING CONDITIONS
Characteristic Symbol Min. Typ. Max. Unit
Supply Voltage
Load Impedance
Peak Load Current
Differential Gain (5KHz Bandwidth)
Voltage at Mute (Pin 7)
Ambient Temperature
I
V
I (MUTE)
ELECTRICAL CHARACTERISTIC
(VCC = 6V, Ta = 25°C, unless otherwise noted)
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
DC ELECTRICAL CHARACTERISTICS
Operating Current (RL = 0) I
Output Voltage (output pin) V
CC
O
V
CC
Z
L
L (PK)
∆G
V
+2.0 − +16 V
8 − 100 W
− 200 − ± 200 mA
0 − 46 dB
0 − V
CC
Ta −20 − 470 °C
VCC = 3.0V, Mute = 0.8V
VCC = 16.0V, Mute = 0.8V
VCC = 3.0V, Mute = 2.0V
RL = 16Ω
R1 = 75kΩ
VCC = 3.0V
VCC = 6.0V
VCC = 12.0V
− 2.7
3.3
4.0
5.0
− 65 100 µA
1.0 1.15
1.25 V
2.65
5.65
V
mA
Output Offset Voltage V
Output High Level V
Output Low Level V
Input Bias Current (pin 2) I
Equivalent Resistance R
Input Low Voltage V
Mute Input High Voltage V
Input Resistance R
AC ELECTRICAL CHARACTERISTICS
Open Loop Gain (Amp 1) G
Close Loop Gain (Amp 2) G
Output Power P
OO
OH
OL
BIAS
EQ
IL (MUTE)
IH (MUTE)
I (MUTE)
V (AMP1)
V (AMP2)
O
VCC = 6.0V, Rf = 75kΩ, RL = 32Ω
2.0V ≤ V
2.0V ≤ V
CC
CC
≤ 16V, I
≤ 16V, I
= -75mA
out
= 75mA
out
− − −100 -200 nA
pin 1
pin 8
− − − 0.8 V
− 2.0 − − V
VCC = Mute = 16V
− 80 − − dB
f = 1.0kHz, RL = 32Ω
V
= 3.0V, RL = 6Ω, THD ≤ 10%
CC
V
= 6.0V, RL = 32Ω, THD ≤ 10%
CC
V
= 12V, RL = 100Ω, THD ≤ 10%
CC
−30 0 +30 mV
− VCC−1.0 − V
− 0.16 − V
100
18
150
25
220
40
kΩ
50 90 175 kΩ
−0.35 0 +0.35 dB
55
− − mW
250
400
4
LOW VOLTAGE AUDIO AMPLIFIER S1T8602B
ELECTRICAL CHARACTERISTIC (Continued)
(VCC = 6V, Ta = 25°C, unless otherwise noted)
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
Total Harmonic Distortion
(f = 1.0kHz)
Gain Bandwidth Product GBW
Power Supply Rejection
(VCC = 6.0V, ∆VCC = 3.0V)
Muting G
THD V
PSRR C1 = ∞, C2 = 0.01µF
V (MUTE)
= 6.0V, RL = 32Ω, PO =125mW
CC
VCC≤3.0V, RL = 8Ω, PO = 20mW
VCC≤12V, RL = 32Ω, PO = 200mW
− − 1.5 − MHz
C
=0.1µF, C2=0, f=1.0kHz
1
C1 = 1.0µF, C2 = 5.0µF, f = 1.0kHz
Mute = 2.0V, 1.0Khz ≤ f ≤ 20kHz
− 0.5
1.0 %
0.5
0.6
50
− dB
12
52
− > 70 − dB
5
S1T8602B LOW VOLTAGE AUDIO AMPLIFIER
APPLICATION CIRCUIT
Vcc Mute
R
f
4 7
0.1µF
R
Audio
Input
i
2
1
KA8602B
S1T8602B
3
Speaker
6
Audio
Input
0.1µF
+
1µF
8 5
+
Figure 1.
Vcc Mute
75K
4 7
2
S1T8602B
1
3K
+ +
0.1µF 5µF
8 5
5µF
KA8602B
3
Speaker
6
Figure 2.
6
LOW VOLTAGE AUDIO AMPLIFIER S1T8602B
Vcc(1.0 ~8.0V)
Audio
Input
0.1µF
3K
Audio
Input
75K
4 7
2
S1T8602B
1
8 5
VEE( -1.0 ~ -8.0V)
0.1µF
KA8602B
3
6
Speaker
10K 20K
Figure 3.
Vcc Mute
75K
4 7
2
1
KA8602B
S1T8602B
3
6
4.7K
Speaker
20K
Vcc
Mute
503
503
5.1K
Figure 4.
5.1K
8 5
+
5µF
7
S1T8602B LOW VOLTAGE AUDIO AMPLIFIER
Vcc Mute
101
Audio
Input
0.1µF
503
100K
100K
503
5.1K
4 7
2
S1T8602B
1
8 5
5.1K
Figure 5.
KA8602B
+
5µF
100
3
Speaker
6
8
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