User guide

MAX9750/MAX9751/MAX9755
2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
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Pin Description
PIN
MAX9750 MAX9751 MAX9755
THIN
QFN
TSSOP
THIN
QFN
TSSOP
THIN
QFN
TSSOP
NAME FUNCTION
15—— 26INL Left-Channel Audio Input
26————BEEP Audible Alert Beep Input
3, 19
7, 23 3, 19 7, 23 3, 19 7, 23
PGND Power Ground
484848
OUTL+
Left-Channel Positive Speaker Output
595959OUTL- Left-Channel Negative Speaker Output
6, 16
10, 20 6, 16 10, 20 6, 16 10, 20
PV
DD
Speaker Amplifier Power Supply
711711711
CPV
DD
Charge-Pump Power Supply
812812 8 12 C1P Charge-Pump Flying-Capacitor Positive Terminal
913913913
CPGND
Charge-Pump Ground
10 14 10 14 10 14 C1N Charge-Pump Flying-Capacitor Negative Terminal
11 15 11 15 11 15 CPV
SS
Charge-Pump Output. Connect to V
SS
.
12 16 12 16 12 16 V
SS
Headphone Amplifier Negative Power Supply
13 17 13 17 13 17
HPOUTR
Right-Channel Headphone Output
14 18 14 18 14 18
HPOUTL
Left-Channel Headphone Output
15 19 15 19 15 19
HPV
DD
Headphone Positive Power Supply
17 21 17 21 17 21 OUTR- Right-Channel Negative Speaker Output
18 22 18 22 18 22
OUTR+
Right-Channel Positive Speaker Output
20 24 20 24 20 24 HPS Headphone Sense Input
21 25 21 25 21 25 BIAS
Common-Mode Bias Voltage. Bypass with a 1µF
capacitor to GND.
22 26 22 26 22 26 SHDN
Shutdown. Drive SHDN low to disable the device.
Connect SHDN to V
DD
for normal operation.
23 27 ————GAIN2Gain Control Input 2
24 28 ————GAIN1Gain Control Input 1
25 1 25 1 25 1 V
DD
Power Supply
26 2 26 2
23, 26 2, 27
GND Ground
27 3 — — 28 4 INR Right-Channel Audio Input
28 4 ————VOLAnalog Volume Control Input
—— 15——INL1 Left-Channel Audio Input 1
—— 26——INL2 Left-Channel Audio Input 2
——23 27 — — IN1/2 Input Select
——24 28 24 28 GAIN Gain Select
——27 3 — — INR1 Right-Channel Audio Input 1
——28 4 — — INR2 Right-Channel Audio Input 2
————
1, 27
3, 5 N.C. No Connection. Not internally connected.