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ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Audio amplifier 1-channel (mono) Class D TQFN 24 (4x4)
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MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
8 _______________________________________________________________________________________
EFFICIENCY vs. OUTPUT POWER
MAX9768 toc13
OUTPUT POWER (W)
EFFICIENCY (%)
104682
20
10
30
50
40
60
100
80
70
90
0
0
PWM MODE
PV
DD
= 12V
f
IN
= 1kHz
R
L
= 8Ω
FILTERLESS MODULATION
EFFICIENCY vs. OUTPUT POWER
MAX9768 toc14
OUTPUT POWER (W)
EFFICIENCY (%)
2.01.0 1.50.5
20
10
30
50
40
60
100
80
70
90
0
0
PWM MODE
FILTERLESS MODULATION
PV
DD
= 5V
f
IN
= 1kHz
R
L
= 8Ω
EFFICIENCY vs. SUPPLY VOLTAGE
MAX9768 toc15
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
14.58.5 10.5 12.56.5
83
86
89
95
92
80
4.5
THD+N = 10%
THD+N = 1%
f
IN
= 1kHz
R
L
= 8Ω
FILTERLESS MODULATION
EFFICIENCY vs. SUPPLY VOLTAGE
MAX9768 toc16
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
14.58.5 10.5 12.56.5
83
86
89
95
92
80
4.5
f
IN
= 1kHz
R
L
= 8Ω
PWM MODULATION
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9768 toc17
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
14810126
2
4
6
8
14
12
10
0
4
R
L
= 8Ω
f
IN
= 1kHz
PWM MODE
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9768 toc18
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
14810126
2
4
6
8
12
10
0
4
R
L
= 4Ω
f
IN
= 1kHz
PWM MODE
THD+N = 1%
THD+N = 10%
OUTPUT POWER vs. LOAD RESISTANCE
MAX9768 toc19
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
3010 15 25205
2
4
6
8
12
10
0
0
PV
DD
= 12V
f = 1kHz
PWM MODE
THD+N = 1%
THD+N = 10%
OUTPUT POWER vs. LOAD RESISTANCE
MAX9768 toc20
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
3010 15 25205
0.5
1.0
1.5
2.5
2.0
3.5
3.0
0
0
PV
DD
= 5V
f = 1kHz
PWM MODE
THD+N = 1%
THD+N = 10%
Typical Operating Characteristics (continued)
(V
PV
DD
= 12V, V
DD
= 3.3V, V
GND
= V
PGND
= 0, V
MUTE
= 0; 0dB volume setting; all speaker load resistors connected between OUT+
and OUT-, R
L
= 8Ω, unless otherwise noted. C
BIAS
= 2.2µF, C1 = C2 = 0.1µF, C
IN
= 0.47µF, R
IN
= 20kΩ, R
FB
= 30kΩ, spread-spec-
trum modulation mode.)