User Manual

_______________________________________________________________________________________ 9
MAX98500
Boosted 2.2W Class D Amplifier
with Automatic Level Control
Pin Description
Pin Configuration
MAX98500
V
CCOUT
LX BSTPGNDPVDD
2 3 41
A
GAIN RKNEE V
BAT
SPKP
B
SPKPGND
TOP VIEW
(BUMP SIDE DOWN)
WLP
AGNDSPKN
C
INP INNSPKPGND
D
+
SDBST
SDSPK
BUMP NAME FUNCTION
A1 PVDD
Speaker Amplifier Power Supply. Bypass to SPKPGND with a 0.1mF capacitor.
A2 V
CCOUT
Boost Converter Output. Connect a 22mF (0805) capacitor between V
CCOUT
and
BSTPGND.
A3 LX Boost Switch Input
A4 BSTPGND Boost Power Ground
B1 SPKP Positive Speaker Output
B2 GAIN
Gain Select Input. Connect GAIN to ground to set the speaker gain to 6dB. Leave GAIN
unconnected to set the speaker gain to 15.5dB. Connect GAIN to V
BAT
to set the speaker
gain to 20dB.
B3 RKNEE ALC Knee Voltage Set Input. Set the ALC knee voltage with a resistor to AGND.
B4 V
BAT
Battery Voltage Input. Connect a 10mF (0805) capacitor between V
BAT
and BSTPGND.
Include at least 22mF of system bulk capacitance.
C1 SPKN Negative Speaker Output
C2, D1 SPKPGND Speaker Ground
C3
SDSPK Speaker Output Shutdown. Drive SDSPK low to shutdown the speaker output.
C4 AGND Analog Ground
D2 INP Positive Audio Input
D3 INN Negative Audio Input
D4 SDBST
Boost Converter Shutdown. Drive SDBST low to shutdown the boost converter and the
speaker output.