MAX9708

20W/40W, Filterless, Spread-Spectrum,

Mono/Stereo, Class D Amplifier

2

Maxim Integrated

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(PVDD = VDD = +18V, PGND = GND = 0V, CSS = 0.47µF, CREG = 0.01µF, C1 = 0.1µF, C2 = 1µF, RLOAD = ∞, MONO = low (stereo

mode), SHDN = MUTE = high, G1 = low, G2 = high (AV = 22dB), FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (RL) are

connected between OUT_+ and OUT_-, unless otherwise stated. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA

= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

PVDD, VDD to PGND, GND .......................................-0.3 to +30V

PVDD to VDD ..........................................................-0.3V to +0.3V

OUTR+, OUTR-, OUTL+,

OUTL- to PGND, GND...........................-0.3V to (PVDD + 0.3V)

C1N to GND .............................................-0.3V to (PVDD + 0.3V)

C1P to GND..............................(PVDD - 0.3V) to (CPVDD + 0.3V)

CPVDD to GND ..........................................(PVDD - 0.3V) to +40V

All Other Pins to GND.............................................-0.3V to +12V

Continuous Input Current (except PVDD, VDD, OUTR+,

OUTR-, OUTL+, and OUTL-) ...........................................20mA

Continuous Power Dissipation (TA = +70°C)

56-Pin TQFN (derate 47.6mW/°C above +70°C) ............3.81W

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature ......................................................+150°C

Thermal Resistance (

θJC)

56-Pin TQFN… .............................................................0.6°C/W

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage Range

VDD

Inferred from PSRR test

10

18

V

Shutdown Current

ISHDN

SHDN = low

0.1

1

µA

Shutdown to Full Operation

tSON

100

ms

Mute to Full Operation

tMUTE

100

ms

G1 = 0, G2 = 1

50

85

125

G1 = 1, G2 = 1

40

63

90

G1 = 1, G2 = 0

25

43

60

Input Impedance

RIN

G1= 0, G2 = 0

12

21

30

k

Ω

Output Pulldown Resistance

SHDN = GND

600

k

Ω

Output Offset Voltage

VOS

AC-coupled input, measured between

OUT_+ and OUT_-

±30

mV

PVDD = 10V to 18V

68

90

fRIPPLE = 1kHz

90

Power-Supply Rejection Ratio

PSRR

200mVP-P ripple

(Note 2)

fRIPPLE = 20kHz

50

dB

DC, input referred

50

70

Common-Mode Rejection Ratio

CMRR

f = 20Hz to 20kHz, input referred

70

dB

Switch On-Resistance

RDS

One power switch

0.3

0.75

Ω

FS1

FS2

0

0

180

200

220

1

1 (SSM)

200

1

0

160

Switching Frequency

fSW

0

1

250

kHz

Oscillator Spread Bandwidth

FS1 = FS2 = high (SSM)

±2

%

SYNCIN Lock Range

Equal to fSW x 4

600

1200

kHz