MAXIM MAX98303 Technical data

19-5494; Rev 0; 9/10

EVALUATION KIT

AVAILABLE

Stereo 3.1W Class D Amplifier

General Description

The MAX98303 stereo 3.1W Class D amplifier provides
Class AB audio performance with Class D efficiency.
This device offers five selectable gain settings (6dB,
9dB, 12dB, 15dB, and 18dB) set by a single gain-select
input (GAIN).

Active emissions limiting, edge-rate, and overshoot con­trol circuitry greatly reduces EMI. A filterless spread­spectrum modulation scheme eliminates the need for
output filtering found in traditional Class D devices. These
features reduce application component count.

The IC's 2.0mA at 3.7V, 2.7mA at 5V, quiescent current
extends battery life in portable applications.

The IC is available in a 16-bump WLP (1.68mm x 1.68mm
x 0.64mm) package specified over the extended -40NC
to +85NC temperature range.

Applications

Notebook and Netbook
Computers

Tablets

Cellular Phones

MP3 Players

Portable Audio Players

VoIP Phones

Features

S Low Quiescent Current: 2.0mA at 3.7V, 2.7mA

at 5V

S Spread Spectrum and Active Emissions Limiting

S Five Pin-Selectable Gains

S Click-and-Pop Suppression

S Thermal and Overcurrent Protection

S Low-Current Shutdown Mode

S Space-Saving, 1.68mm x 1.68mm x 0.64mm,

16-Bump WLP (0.4mm Pitch)

Ordering Information

PART

MAX98303EWE+

+Denotes a lead(Pb)-free/RoHS-compliant package.

TEMP

RANGE

-40NC to
+85NC

PIN-

PACKAGE

16 WLP AAA

MARK

TOP

MAX98303

Typical Application Circuit

+2.6V TO +5.5V

10µF

OUTL-

OUTR+

OUTR-

1µF

INL+ OUTL+

1µF

INL-

PVDD

GAIN GAIN

1µF

INR+

1µF

INR-

PVDD

SHDN

PVDD

CONTROL

MAX98303

PGND

0.1µF

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

Stereo 3.1W Class D Amplifier

ABSOLUTE MAXIMUM RATINGS

PVDD to PGND ........................................................-0.3V to +6V

OUT_+, OUT_- to PGND .......................-0.3V to (V

All Other Pins to PGND ........................................... -0.3V to +6V

Continuous Current for PVDD, PGND,

OUTL_, OUTR_ ........................................................ Q1600mA

Continuous Input Current (all other pins) ........................ Q20mA

Duration of Short Circuit Between

OUTL_, OUTR_ to PVDD or PGND ........................Continuous

OUTL+ to OUTL-, OUTR+ to OUTR- .................... Continuous

MAX98303

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

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

+ 0.3V)

ELECTRICAL CHARACTERISTICS

(V

= V

PVDD

AC measurement bandwidth, TA = T

Supply Voltage Range V
Undervoltage Lockout UVLO 2.3 V

Quiescent Supply Current I

Shutdown Supply Current
Turn-On Time t
Bias Voltage V

Voltage Gain A

Channel-to-Channel Gain
Tracking

Input Resistance R

Output Offset Voltage V

= 3.7V, V

SHDN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz

PGND

MIN

to T

PVDD

DD

I

SHDN

ON

BIAS

OS

, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 2, 3)

MAX

Inferred from PSRR test 2.6 5.5 V

V

= 5.0V 2.7

PVDD

V

= 0V, TA = +25NC

SHDN

Connect GAIN to PGND 17.5 18 18.5

Connect GAIN to PGND through 100kI
±5% resistor

Connect GAIN to PVDD 11.5 12 12.5

V

Connect GAIN to PVDD through 100kI
±5% resistor

GAIN unconnected 5.5 6 6.5

AV = 18dB 15 20 29
AV = 15dB 15 20 29
AV = 12dB 15 20 29

IN

AV = 9dB 20 28 40
AV = 6dB 30 40 58
TA = +25NC (Note 4)

Continuous Power Dissipation for Multilayer Board (TA = +70NC)

16-Bump WLP (derate 17.2mW/NC above +70NC) ........1.38W

B

(Note 1) ..................................................................58NC/W

JA

B

(Note 1) .................................................................15NC/W

JC

Junction Temperature .....................................................+150NC

Operating Temperature Range .......................... -40NC to +85NC

Storage Temperature Range ............................ -65NC to +150NC

Soldering Temperature (reflow) ......................................+260NC

2.0 3.1

≤ 0.1 10

3.4 10 ms

1.3 V

14.5 15 15.5

8.5 9 9.5

±0.1

±0.3 ±3

mA

FA

dB

%

kI

mV

2 ______________________________________________________________________________________

Stereo 3.1W Class D Amplifier

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

PVDD

AC measurement bandwidth, TA = T

Click and Pop K

Common-Mode Rejection Ratio CMRR

Crosstalk

Power-Supply Rejection Ratio
(Note 4)

Output Power P

Total Harmonic Distortion Plus
Noise

Oscillator Frequency f
Spread-Spectrum Bandwidth
Efficiency
Output Noise V
Signal-to-Noise Ratio SNR P

SHDN

= 3.7V, V

= 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz

PGND

MIN

to T

, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 2, 3)

MAX

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Peak voltage, A-weighted,

CP

32 samples per second,
RL = 8I + 68FH
(Notes 4, 5)

fIN = 1kHz,
input referred

P

= 300mW,

OUT

RL = 8I + 68FH

V

= 2.6V to 5.5V, TA = +25NC

PVDD

PSRR

V

RIPPLE

= 200mV

P-P

RL = 8I + 68FH

THD+N = 10%, f = 1kHz,
RL = 4I + 33µH

THD+N = 1%, f = 1kHz,
RL = 4I + 33µH

OUT

THD+N = 10%, f = 1kHz,
RL = 8I + 68µH

THD+N = 1%, f = 1kHz,
RL = 8I + 68µH

THD+N fIN = 1kHz

OSC

E THD+N = 10%, f = 1kHz, RL = 8I + 68FH

AV = 6dB, A weighted (Note 4) 37

N

= 3.1W, V

OUT

PVDD

Into shutdown -74

dBV

Out of shutdown -59

AV = 18dB 67
AV = 15dB 72
AV = 12dB 67
AV = 9dB 65
AV = 6dB 62
f = 1kHz 100
f = 10kHz 95

51 78

f = 217Hz 66

,

f = 1kHz 66
f = 10kHz 63
V

= 5.0V 3.1

PVDD

V

= 4.2V 2.2

PVDD

V

= 3.7V 1.7

PVDD

V

= 5.0V 2.5

PVDD

V

= 4.2V 1.7

PVDD

V

= 3.7V 1.3

PVDD

V

= 5.0V 1.8

PVDD

V

= 4.2V 1.2

PVDD

V

= 3.7V 1.0

PVDD

V

= 5.0V 1.4

PVDD

V

= 4.2V 1.0

PVDD

V

= 3.7V 0.7

PVDD

RL = 4I + 33FH,
P

= 1W

OUT

RL = 8I + 68FH,
P

= 0.5W

OUT

0.047

0.04

300 kHz

±15

kHz

93 %

FV

= 5.0V, AV = 6dB 99.6 dB

MAX98303

dB

dB

dB

W

%

RMS

_______________________________________________________________________________________ 3

Stereo 3.1W Class D Amplifier

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

PVDD

AC measurement bandwidth, TA = T

Output Current Limit I
Thermal Shutdown Level 145
Thermal Shutdown Hysteresis 15

DIGITAL INPUT (SHDN)

MAX98303

Input Voltage High V
Input Voltage Low V
Input Leakage Current

Note 2: This device is 100% production tested at TA = +25NC. All temperature limits are guaranteed by design.
Note 3: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL = 4I,

L = 33FH. For RL = 8I, L = 68FH.

Note 4: Amplifier inputs AC-coupled to ground.
Note 5: Mode transitions controlled by SHDN.

SHDN

= 3.7V, V

= 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz

PGND

MIN

to T

, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 2, 3)

MAX

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LIM

INH

INL

V

= 2.5V to 5.5V 1.4 V

PVDD

V

= 2.5V to 5.5V 0.4 V

PVDD

2 A

TA = +25NC

±1

NC
NC

FA

Typical Operating Characteristics

(V

= V

PVDD

bandwidth, TA = +25NC, unless otherwise noted.)

10

1

THD+N (%)

0.1

0.01
10 100k

SHDN

= 5.0V, V

= 0V, AV = 12dB, RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement

PGND

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

V

= 5V

PVDD

= 4I + 33µH

Z

LOAD

P

= 2W

OUT

P

= 1.5W

OUT

10k1k100

FREQUENCY (Hz)

MAX98303 toc01

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

10

V

= 4.2V

PVDD

= 4I + 33µH

Z

LOAD

P

= 0.2W

1

THD+N (%)

0.1

0.01
10 100k

OUT

P

= 1W

OUT

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

10

V

= 3.7V

PVDD

= 4I + 33µH

Z

MAX98303 toc02

THD+N (%)

10k1k100

LOAD

1

P

= 0.8W

0.1

0.01

OUT

P

= 0.2W

OUT

10 100k

FREQUENCY (Hz)

10k1k100

MAX98303 toc03

4 ______________________________________________________________________________________