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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.

Boosted 2.2W Class D Amplifier

with Automatic Level Control

19-6145; Rev 0; 12/11

Simplified Block Diagram

General Description

The MAX98502 is a high-efficiency, Class D audio ampli-

fier that features an integrated boost converter to deliver

a constant output power over a wide range of battery

supply voltages.

The boost converter operates at 2MHz, requiring only a

small (2.2FH) external inductor and capacitor.

The automatic level control has a battery tracking func-

tion that reduces the output swing as the supply voltage

drops, preventing collapse of battery voltage.

The amplifier has differential inputs and an internal fully

differential design. The MAX98502 also features three

gain settings (6dB, 15.5dB, and 20dB) that are select-

able with a logic input.

The MAX98502 is available in a small, 0.5mm pitch

16-bump WLP package (2.1mm x 2.1mm). It is specified

over the extended -40NC to +85NC temperature range.

Applications

Cell Phones

Smartphones

GPS Devices

Mobile Internet Devices

Active Speaker Accessories

Features

S

Boosted Class D Output

S

Integrated Automatic Level Control

S

Output Power

2.2W into 8I, 10% THD+N

1.7W into 8I, 1% THD+N

4.1W into 4I, 10% THD+N

3.4W into 4I, 1% THD+N

S

Wide 2.5V to 5.5V Supply Voltage Range

S

Undervoltage Lockout Protection

S

High Total Efficiency of 87%

S

High Step-Up Switching Frequency (2MHz)

S

Active Emission Limiting for Low EMI

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

Ordering Information

Typical Application Circuit appears at end of data sheet.

PART

TEMP RANGE

PIN-PACKAGE

MAX98502EWE+

-40NC to +85NC

16 WLP

CONTROL

DIFFERENTIAL

INPUT

BOOST CONVERTER

GAIN

OUTPUT

STAGE

BATTERY

SPKP

SPKN

PVDD

LX

AGND

SPKPGND

BSTPGND

C4

A4

D1, C2

D3

RKNEE B3

GAIN B2

SDSPK C3

SDBST D4

B4

A3

A2

A1

B1

C1

INP D2

INN

MAX98502