Rainbow Electronics MAX98314 User Manual

EVALUATION KIT AVAILABLE

19-6124; Rev 0; 11/11

MAX98314

Mono 3.2W Class D Amplifier

with Integrated Input Coupling Capacitors

General Description

The MAX98314 mono 3.2W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (0dB, 3dB, 6dB, 9dB, and 12dB) set by a single gain-select input (GAIN).

Active emissions limiting (AEL) edge rate and overshoot control circuitry and a filterless spread-spectrum modulation (SSM) scheme greatly reduce EMI and eliminate the need for output filtering found in traditional Class D devices.

The IC’s low 0.95mA at 3.7V, 1.2mA at 5.0V quiescent current extends battery life in portable applications.

Highly linear, integrated input coupling capacitors (CIN) reduce solution size and provide excellent THD+N, PSRR, and CMRR performance at low frequencies vs. standard Class D amplifiers using external input capacitors.

The IC is available in a small 9-bump, 0.3mm pitch WLP (1.0mm x 1.0mm x 0.80mm) package and is specified over the -40NC to +85NC extended temperature range.

Applications

Mobile Phones

Portable Audio

Notebook Computers

MP3 Players

Netbook Computers

VoIP Phones

Features

S Integrated Input Coupling Capacitors with

Excellent Linearity

 fC = 100Hz (6dB)  fC = 200Hz (12dB)

S Low Quiescent Current

 0.95mA at 3.7V  1.2mA at 5.0V

S Delivers High Output Power at 10% THD+N

 3.2W into 4I, V  960mW into 8I, V

S Ultra-Low Noise: 19µV

S Eliminates Output Filtering Requirement

 Spread Spectrum and Active Emissions Limiting

S Click-and-Pop Suppression

S Thermal and Overcurrent Protection

S Low Current Shutdown Mode

S Small, Space-Saving Package

PVDD

= 5V

= 3.7V

Simplified Block Diagram

C

IN

C

IN

MAX98314

CLASS D

MODULATOR

AND H-BRIDGE

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX98314.related

�� Maxim Integrated Products 1

GAIN CONTROL

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.

MAX98314

Mono 3.2W Class D Amplifier

with Integrated Input Coupling Capacitors

Functional Diagram/Typical Application Circuit

2.5V TO 5.5V

SHDN

GAIN

IN+

0.1µF

PVDD

A3

C1

UVLO/POWER

MANAGEMENT

MAX98314

B3

C3

C2

IN-

10µF*

CLICK-AND-POP

SUPPRESSION

CLASS D

MODULATOR

B1

PGND

LOW-EMI

DRIVER

LOW-EMI

DRIVER

PVDD

A1A2OUT-

PGND

PVDD

OUT+

PGND

*SYSTEM BULK CAPACITANCE.

�� Maxim Integrated Products 2

MAX98314

Mono 3.2W Class D Amplifier

with Integrated Input Coupling Capacitors

ABSOLUTE MAXIMUM RATINGS

PVDD, IN+, IN-, SHDN, GAIN to PGND ................... 0.3V to +6V

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

Continuous Current In/Out of PVDD, PGND, OUT_ .........750mA

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

Duration of Short Circuit Between

OUT_ to PVDD, PGND ..........................................Continuous

Between OUT+ and OUT- Pins .............................Continuous

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)

PACKAGE THERMAL CHARACTERISTICS (Note 1)

WLP

Junction-to-Ambient Thermal Resistance (BJA) ........102NC/W

Junction-to-Case Thermal Resistance (BJC) ...............47NC/W

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.

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

WLP (derate 10.64mW/NC above +70NC) .....................851mW

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

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

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

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

ELECTRICAL CHARACTERISTICS

(V

= V

PVDD

ment bandwidth 20Hz to 22kHz, TA = T

AMPLIFIER CHARACTERISTICS

Supply Voltage Range V Undervoltage Lockout UVLO PVDD falling 1.8 2.2 V

Quiescent Current I

Shutdown Supply Current

Turn-On Time t

Bias Voltage V

Voltage Gain A

Input Capacitance C

Highpass Corner Frequency f

= V

SHDN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GAIN

= 5V, V

= 0V, AV = 6dB (GAIN = PVDD), RL = J, RL connected between OUT+ to OUT-, AC measure-

PGND

MIN

PVDD

I

SHDN

ON

BIAS

IN

C

to T

V

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

MAX

Guaranteed by PSRR test 2.5 5.5 V

V

= 5V 1.2 1.8

PVDD

V

= 3.7V 0.95

PVDD

V

= 0V, TA = +25NC

SHDN

3.7 10 ms

V

GAIN connected to PGND 11.75 12 12.25 GAIN connected to PGND

through 100kI Q5% resistor

f = 1kHz

All gains 0.011

-3dB down

GAIN connected to PVDD 5.75 6 6.25

GAIN connected to PVDD through 100kI Q5% resistor

GAIN unconnected -0.25 0 +0.25

AV = 12dB 199

AV = 9dB 139

AV = 6dB 63 100 189

AV = 3dB 70

AV = 0dB 50

8.75 9 9.25

2.75 3 3.25

< 0.1 10

/2 V

PVDD

mA

FA

dB

FF

Hz

�� Maxim Integrated Products 3

MAX98314

Mono 3.2W Class D Amplifier

with Integrated Input Coupling Capacitors

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

PVDD

ment bandwidth 20Hz to 22kHz, TA = T

Common-Mode Rejection Ratio CMRR fIN = 1kHz, input referred 67 dB

Output Offset Voltage V

= V

SHDN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GAIN

= 5V, V

= 0V, AV = 6dB (GAIN = PVDD), RL = J, RL connected between OUT+ to OUT-, AC measure-

PGND

MIN

OS

to T

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

MAX

TA = +25NC (Note 4) Q1 Q3

mV

RL = 8I + 68FH, peak voltage, TA = +25NC,

Click-and-Pop Level K

Power-Supply Rejection Ratio (Note 4)

Output Power P

Total Harmonic Distortion Plus Noise

Output Noise V

Efficiency

Oscillator Frequency f

Spread-Spectrum Bandwidth 20 kHz

Current Limit 2.8 A

Thermal Shutdown Level 155

CP

PSRR

OUT

THD+N fIN = 1kHz

N

E RL = 8I, P

OSC

A-weighted, 32 samples per second, TA = +25NC (Notes 4, 5)

V

= 2.5V to 5.5V, TA = +25NC

PVDD

V

THD+N = 10% f = 1kHz RL = 4I + 33FH

THD+N = 1% f = 1kHz RL = 4I + 33FH

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

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

A-weighted (Note 4)

RIPPLE

= 200mV

= 1.8W, f = 1kHz

OUT

P-P

Into shutdown -59

Out of shutdown -82

70 90 f = 217Hz 74 f = 1kHz 72 f = 20kHz 49 V

= 5.0V 3.2

PVDD

V

= 4.2V 2.2

PVDD

V

= 3.7V 1.7

PVDD

V

= 5.0V 2.6

PVDD

V

= 4.2V 1.8

PVDD

V

= 3.7V 1.4

PVDD

V

= 5.0V 1.8

PVDD

V

= 4.2V 1.2

PVDD

V

= 3.7V 0.96

PVDD

V

= 5.0V 1.4

PVDD

V

= 4.2V 1

PVDD

V

= 3.7V 0.8

PVDD

RL = 4I, P

= 1W

OUT

RL = 8I P

= 0.725W

OUT

AV = 12dB 31

AV = 9dB 26

AV = 6dB 23

AV = 3dB 21

AV = 0dB 19

0.03 0.1

0.03

93 %

300 kHz

FV

dBV

dB

W

%

RMS

NC

�� Maxim Integrated Products 4

MAX98314

Mono 3.2W Class D Amplifier

with Integrated Input Coupling Capacitors

ELECTRICAL CHARACTERISTICS (continued)

(V

= V

PVDD

ment bandwidth 20Hz to 22kHz, TA = T

Thermal Hysteresis 15

DIGITAL INPUT (SHDN)

Input Voltage High V

Input Voltage Low V

Input Leakage Current

Note 2: All devices are 100% production tested at TA = +25NC. Specifications over 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,

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

(V

= V

PVDD

to 22kHz, TA = +25NC, unless otherwise noted.)

10

1

SHDN

= V

GAIN

= 5V, V

= 0V, AV = 6dB (GAIN = PVDD), RL = J, RL connected between OUT+ to OUT-, AC measure-

PGND

MIN

to T

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

MAX

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

INH

INL

= 2.5V to 5.5V 1.4 V

PVDD

V

= 2.5V to 5.5V 0.4 V

PVDD

TA = +25NC Q1 FA

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

Typical Operating Characteristics

= 5.0V, V

SHDN

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

V

= 5V

PVDD

Z

= 4I + 33µH

LOAD

P

= 2W

OUT

= 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz

PGND

MAX98314 toc01

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

10

V

= 4.2V

PVDD

Z

= 4I + 33µH

LOAD

1

P

= 1W

OUT

MAX98314 toc02

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

10

V

= 3.7V

PVDD

Z

= 4I + 33µH

LOAD

P

= 0.8W

1

OUT

NC

MAX98314 toc03

0.1

THD+N (%)

0.01

0.001

P

= 1.5W

OUT

10 100k

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

10

V

= 5V

PVDD

Z

= 8I + 68µH

LOAD

P

= 1.2W

1

0.1

THD+N (%)

0.01

0.001 10 100k

OUT

P

= 0.2W

OUT

FREQUENCY (Hz)

�� Maxim Integrated Products 5

0.1

THD+N (%)

0.01

P

= 0.5W

OUT

10k1k100

0.001 10 100k

FREQUENCY (Hz)

10k1k100

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

10

V

= 4.2V

PVDD

Z

= 8I + 68µH

MAX98314 toc04

THD+N (%)

10k1k100

LOAD

1

0.1

0.01

0.001 10 100k

P

= 0.6W

OUT

P

= 0.3W

OUT

FREQUENCY (Hz)

10k1k100

MAX98314 toc05

0.1

THD+N (%)

0.01

P

= 0.2W

OUT

0.001 10 100k

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

10

V

= 3.7V

PVDD

Z

= 8I + 68µH

LOAD

1

0.1

THD+N (%)

0.01

0.001

P

= 0.2W

OUT

10 100k

FREQUENCY (Hz)

10k1k100

= 0.4W

MAX98314 toc06

P

OUT

10k1k100