MAX9744 datasheet(2/28 Pages) MAXIM

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20W Stereo Class D Speaker Amplifier

with Volume Control

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VPVDD = 12V, VDD = 3.3V, VGND = VPGND = 0V, VMUTE = 0V; max volume setting; all speaker load resistors connected between

OUT_+ and OUT_-, RL = ∞, unless otherwise stated, CBOOT_ = 0.1µF, CBIAS = 2.2µF, CIN = 0.47µF, RIN = 20kΩ, RF_ = 20kΩ, spread-

spectrum mode, filterless modulation mode, see the

Functional Diagrams/Typical Application Circuits. TA = TMIN to TMAX, unless oth-

erwise 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 to PGND ....................................................................+16V

VDD to GND ...........................................................................+4V

FB_, SYNCOUT, SYNC, SDA/VOL, ADDR1,

ADDR2 to GND........................................-0.3V to (VDD + 0.3V)

BOOT_ to VDD ..........................................................-0.3V to +6V

BOOT_ to OUT_........................................................-0.3V to +6V

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

PGND to GND .......................................................-0.3V to +0.3V

Any Other Pin to GND ..............................................-0.3V to +4V

OUT_, Short-Circuit Duration......................................Continuous

Continuous Power Dissipation (TA = +70°C)

44-Pin Thin QFN (derate 27mW/°C above +70°C,

single-layer board) ...................................................2162mW

44-Pin Thin QFN (derate 37mW/°C above +70°C,

multilayer board) ......................................................2963mW

θJA, Single-Layer Board................................................37°C/W

θJA, Multilayer Board ................................................….27°C/W

Continuous Input Current (PVDD, PGND).............................6.4A

Continuous Output Current (OUT_) ......................................3.2A

Continuous Input Current (except OUT_).........................±20mA

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

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

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

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

GENERAL

Speaker Amplifier Supply Voltage

Range

PVDD

Inferred from PSRR test

4.5

Supply Voltage Range

VDD

Inferred from PSRR test

2.7

3.6

IDD

Quiescent Current

IPVDD

IVDDSHDN

TA = +25°C

0.1

Shutdown Current

IPVDDSHDN

TA = +25°C

0.1

µA

Turn-On Time

tON

200

Common-Mode Bias Voltage

VBIAS

1.5

Input Amplifier Output-Voltage

Swing High

VOH

Specified as VDD – VOH, RL = 2k

connected to 1.5V

Input Amplifier Output-Voltage

Swing Low

VOL

Specified as VOL – GND, RL = 2k

connected to 1.5V

Input Amplifier Output Short-

Circuit Current Limit

±60

Input Amplifier Gain-Bandwidth

Product

GBW

1.8

MHz

SPEAKER AMPLIFIERS

Output stage gain

29.5

Gain

AVMAX

Maximum

volume setting

Total gain (Note 2)

29.5

Output Offset

VOS

TA = 25°C

±2

±15

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