2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Block Diagrams
4.5V TO 5.5V
0.1µF
V
DD
25
(1)
6, 16
(10, 20)
PV
DD
4.5V TO 5.5V
0.1µF
MAX9750
4
(8)
C
1µF
IN
1
(5)
OUTL+
OUTL-
GAIN/
VOLUME
CONTROL
INL
BTL
AMPLIFIER
5
(9)
LEFT-CHANNEL
AUDIO INPUT
18
(22)
C
1µF
IN
27
(3)
OUTR+
GAIN/
VOLUME
CONTROL
INR
BTL
AMPLIFIER
RIGHT-CHANNEL
AUDIO INPUT
17
(21) OUTR-
21
(25)
BIAS
VOL
15
(19)
28
(4)
C
1µF
BIAS
HPV
HPS
DD
3V TO 5.5V
0.1µF
GAIN/
VOLUME
CONTROL
20
(24)
24
(28)
GAIN1
GAIN2
BEEP
V
V
DD
23
(27)
HEADPHONE
DETECTION
14
(18)
DD
HPOUTL
2
(6)
0.47µF
47kΩ
BEEP
DETECTION
22
(26)
13
(17)
SHUTDOWN
CONTROL
SHDN
V
DD
HPOUTR
7
CPV
(11)
DD
3V TO 5.5V
8
(12)
10
(14)
1µF
C1P
C1
1µF
CHARGE
PUMP
C1N
9
(13)
CPGND
26
(2)
3, 19
(7, 23)
11 12
(15) (16)
CPV
V
SS
GND
PGND
SS
C2
1µF
( ) TSSOP PIN.
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
