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Page 2
AudioMAX™
I N T E G R A T E D
P R O D U C T S
LX1721 / 1722
Class-D Stereo Power Amplifier Controller
P
RODUCTION
FUNCTIONAL PIN DESCRIPTION
P
IN
N
AME
LFAOUT
CPWM
RPWM
LMUTE
LEAOUT
LEAIN
VREF
CLOCK
GND
V25
LIN+
LIN-
LAMPOUT
RIN+
RIN-
RAMPOUT
D
ESCRIPTION
Left Feedback Amplifier Output
PWM Capacitor Connection
PWM Resistor Connection
Left Mute Input (Active High)
Left Error Amplifier Output
Left Inverting Input of Error Amplifier
5V Reference
Input / Output Clock for Synch Operation
Low Current Ground
2.5V Reference
Left Positive Audio Input
Left Negative Audio Input
Left Input Amplifier Output
Right Positive Audio Input
Right Negative Audio Input
Right Input Amplifier Output
Sleep Input (active low)
UVLO Indicator (Open Collector Output)
Right Mute Input (Active High)
Right Inverting Input of Error Amplifier
Right Error Amplifier Output
Right Feedback Amplifier Output
P
IN
N
AME
LFBK-
LFBK+
LISN
VDD
CN
PVDD
PGND
LN+
LP+
LP-
LN-
RN-
RP-
RP+
RN+
PGND
CP
PVDD
NC
RISN
RFBK+
RFBK-
D
ESCRIPTION
Left Feedback Amplifier Inverting Input
Left Feedback Amplifier Non-Inverting
Input
Left Current Limit Sense Input
Analog Supply Voltage
Supply Decoupling for NFET Drivers
Output Driver Supply Voltage
Output Driver High Current Ground
Left Drive for NFET on Positive Half of
Bridge
Left Drive for PFET on Positive Half of
Bridge
Left Drive for PFET on Negative Half of
Bridge
Left Drive for NFET on Negative Half of
Bridge
Right Drive for NFET on Negative Half of
Bridge
Right Drive for PFET on Negative Half of
Bridge
Right Drive for PFET on Positive Half of
Bridge
Right Drive for NFET on Positive Half of
Bridge
Output Driver High Current Ground
Supply Decoupling for PFET Drivers
Output Driver Supply Voltage
No Connect
Right Current Limit Sense Input
Left Feedback Amplifier Non-Inverting
Input
Right Feedback Amplifier Inverting Input
WWW .
Microsemi
.C
OM
SLEEP
STATUS
RMUTE
REAIN
REAOUT
RFAOUT
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (PVDD, VDD) ............................................................................................................................. -0.3V to 30V
SLEEP
,
STATUS, R/LFBK+, R/LFBK- .................................................................................................-0.3V to VDD +0.3V
R/LISN .........................................................................................................................................PVDD –2 to PVDD to +0.3V
RPWM, CPWM, R/LMUTE ................................................................................................................... -0.3V to VREF +0.3V
R/LIN+, R/LIN-, R/LAMPOUT.............................................................................................................. -0.3V to VREF +0.3V
R/LEAIN, R/LEAOUT, R/LFAOUT ..................................................................................................... -0.3V to VREF + 0.3V
CLOCK ........................................................................................................................................................-0.3V to CN +0.3V
Operating Junction Temperature Plastic........................................................................................................................... 125°C
Storage Temperature Range ...............................................................................................................................-65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ...................................................................................................................... 300°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into negative out of the
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