General Description

The MAX9879 combines a high-efficiency stereo Class D

audio power amplifier with a stereo capacitor-less

D amplifiers with active emissions limiting technology pro-

vide Class AB performance with Class D efficiency.

The Class D power amplifier delivers up to 715mW from

a 3.7V supply into an 8

Ω load with 88% efficiency to

extend battery life. The filterless modulation scheme

combined with active emission limiting circuitry and

spread-spectrum modulation greatly reduces EMI while

eliminating the need for output filtering used in tradition-

al Class D devices.

The headphone amplifier delivers up to 58mW from a

3.7V supply into a 16

Ω load. Maxim’s patented

DirectDrive architecture produces a ground-referenced

output from a single supply, eliminating the need for

large DC-blocking capacitors, saving cost, space and

component height.

The device utilizes a user-defined input architecture,

three preamplifier gain settings, an input mixer, volume

control, comprehensive click-and-pop suppression, and

ed Class D amplifier and utilizes an internal DPST switch

to allow an external amplifier to drive the speaker that is

connected at the outputs of the MAX9879.

The MAX9879 is available in a thermally efficient,

space-saving 30-bump UCSP™ package.

Applications

Features

♦ Better than 9dB Margin Under EN 55022 Class B

Limits with No Filter Components

♦ Low RF Susceptibility Design Rejects TDMA

Noise from GSM Radios

♦ Input Mixer with User Defined Input Mode

♦ Stereo 58mW Headphone Output (16Ω,

♦ Low 0.04% THD+N at 1kHz (Class D Power

Amplifier)

♦ Low 0.018% THD+N at 1kHz (Headphone

Amplifier)

♦ 1.6Ω Analog Switch for Speaker Amplifier Bypass

♦ High Speaker Amplifier PSRR (72dB at 217Hz)

♦ High Headphone Amplifier PSRR (84dB at 217Hz)

♦ Hardware and Software Shutdown Mode

♦ Ultra-Low Click and Pop

♦ Robust Design with Current and Thermal

Protection

♦ Available in Space-Saving Package

5x6 UCSP (2.5mm x 3mm)

Stereo Class D Audio Subsystem

with DirectDrive Headphone Amplifier

________________________________________________________________

Maxim Integrated Products

1

MIXER

PREAMPLIFIER

SINGLE SUPPLY

2.7V TO 5.5V

INTERFACE

VOLUME

CONTROL

VOLUME

CONTROL

BYPASS

MAX9879

Simplified Block Diagram

OUTL-

PVDDL

OUTL+

C1P

1

A

B

C

D

E

2

3

4

PGNDR

RXIN-

PGNDL

RXIN+

C1N

PGNDR

GND

GND

GND

GND

BIAS

INB1

INA1

HPL

SCL

56

TOP VIEW

(BUMP SIDE DOWN)

OUTR-

PVDDR

OUTR+

SDA

INB2

INA2

HPR

SHDN

Pin Configuration

19-4436; Rev 0; 2/09

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.

EVALUATION

KIT

AVAILABLE

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX9879ERV+

-40°C to +85°C

30 UCSP (5x6)

+

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

Cell Phones

Portable Multimedia Players

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

UCSP is a trademark of Maxim Integrated Products, Inc.