MAX9720 datasheet(2/21 Pages) MAXIM

2 / 21 page

50mW, DirectDrive, Stereo Headphone

Amplifier with SmartSense and Shutdown

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD = VMODE1 = VMODE2 = 3.0V, PGND = SGND = 0V, RL =

∞, C1 = C2 = 2.2µF. 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.

PGND to SGND .....................................................-0.3V to +0.3V

PVSS to SVSS .........................................................-0.3V to +0.3V

VDD to PGND or SGND ............................................-0.3V to +4V

PVSS and SVSS to PGND or SGND ..........................-4V to +0.3V

IN_, OUT_, and HPS to SGND .......(SVSS - 0.3V) to (VDD + 0.3V)

C1P to PGND ...............................(PGND - 0.3V) to (VDD + 0.3V)

C1N to PGND .............................(PVSS - 0.3V) to (PGND + 0.3V)

ALERT to PGND .......................................................-0.3V to +4V

MODE_ to PGND ........................................-0.3V to (VDD + 0.3V)

TIME to SGND ............................................-0.3V to (VDD + 0.3V)

Output Short Circuit to GND or VDD ...............................Continuous

Continuous Power Dissipation (TA = +70°C)

16-Bump UCSP (derate 8.2mW/°C above +70°C) .......659mW

16-Pin TSSOP (derate 9.4mW/°C above +70°C) .......754.7mW

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

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

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

Bump Temperature (soldering)

Reflow ...........................................................................+235°C

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

GENERAL

Supply Voltage Range

VDD

Inferred from PSRR test

1.8

3.6

Stereo mode

8.4

Supply Current

IDD

Mono mode (MODE1 = VDD, MODE2 = GND)

Shutdown Supply Current

ISHDN

MODE1 = MODE2 = GND

µA

Turn-On/Turn-Off Time

250

µs

CHARGE PUMP

Oscillator Frequency

fOSC

272

320

368

kHz

HEADPHONE AMPLIFIERS

MAX9720A

-1.02

-1

-0.98

Voltage Gain

MAX9720B

-1.443

-1.415

-1.386

V/V

Gain Match

∆AV

Between OUTL and OUTR

±1%

MAX9720A

-5

-0.8

+3.6

Total Output Offset Voltage

(Note 3)

VOS

MAX9720B

-6.5

-1

+4.5

Input Resistance

RIN

Ω

1.8V

≤ VDD ≤ 3.6V

(Note 3)

fRIPPLE = 217Hz

fRIPPLE = 1kHz

Power-Supply Rejection Ratio

PSRR

VDD = 3.0V,

200mVP-P ripple

(Note 3)

fRIPPLE = 20kHz

RL = 32

Ω

Output Power

POUT

THD+N = 1%, fIN =

1kHz, TA = +25°C

RL = 16

Ω

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