MAX98307_1109 Datasheet, PDF(1/21 Page) Maxim Integrated Products – 3.3W Mono Class DG Multilevel Audio Amplifier

19-5848; Rev 2; 9/11

EVALUATION KIT AVAILABLE

MAX98307/MAX98308

3.3W Mono Class DG Multilevel Audio Amplifier

General Description

The MAX98307/MAX98308 fully differential mono Class

DG multilevel power amplifiers with integrated inverting

charge pumps offer highly efficient, high-power audio

solutions for portable applications.

Class DG multilevel modulation extends the dynamic

range of the output signal by employing a charge-pump-

generated negative rail as needed to extend the supply

range. This scheme results in high efficiency over a wide

output power range.

The ICs combine Maximâs active emissions limiting edge

rate and overshoot control circuitry with multilevel out-

put modulation to greatly reduce EMI. These features

eliminate the need for output filtering as compared to

traditional Class D devices, reducing component count

and cost.

The MAX98307âs 16-pin TQFN package features an

adjustable gain set by external resistors. The MAX98308âs

space-saving 12-bump WLP package features an inter-

nally fixed gain of 8.5dB, 11.5dB, 14.5dB, 17.5dB, and

20.5dB set by a single gain input. Both devices operate

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

Applications

Cellular Phones

Smartphones

Notebook Computers

VoIP Phones

Portable Audio

Tablet PCs

Benefits and Features

S High Efficiency Combined with High Output Power

ï² Class DG Multilevel Modulation Ensures

Maximum Efficiency Over Wide Output Power

Range

S Improves Battery Life

ï² Low 1.85mA Quiescent Current

S High Output Power at 1% THD+N

ï² 1.54W at VPVDD = 3.6V, 8I + 68ÂµH Load

ï² 2.85W at VPVDD = 5V, 8I + 68ÂµH Load

S High Output Power at 10% THD+N

ï² 1.77W at VPVDD = 3.6V, 8I + 68ÂµH Load

ï² 3.3W at VPVDD = 5V, 8I + 68ÂµH Load

S 84% Efficiency (VPVDD = 3.6V, at 500mW Output)

S Active Emissions Limiting and Class DG Multilevel

Output Modulation Eliminates EMI Output Filtering

Requirement

S Integrated Charge Pump and High Efficiency

Results in Small Solution Size

S Excellent RF Immunity

S Click-and-Pop Suppression

S Thermal and Overcurrent Protection

S Low-Current Shutdown Mode

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/MAX98307.related.

Simplified Block Diagrams

SHDN VCC PVDD PVSS SVSS

FB+

C1P

CHARGE PUMP

C1N

MAX98307

IN+

OUT+

CLASS DG

IN-

AMPLIFIER

OUT-

FB-

GND PGND

SHDN

MAX98308

IN+

IN-

GAIN

PVDD PVSS

C1P