General Description

The MAX9730 features a mono Class G power amplifier

with an integrated inverting charge-pump power supply.

The charge pump can supply up to 500mA of peak out-

put current over a 2.7VDC to 5.5VDC supply voltage

range, guaranteeing up to 2.4W output power into an

8

Ω load. The 2.4W output power allows for transient

audio content to remain unclipped as the battery rail col-

lapses over time.

The MAX9730 maximizes battery life by offering high-

performance efficiency. Maxim’s proprietary output

stage provides efficiency levels greater than Class AB

devices without the EMI penalties commonly associat-

ed with Class D amplifiers. High efficiency allows the

MAX9730 to be packaged in a WLP package without

derating the output power handling capability.

The device utilizes fully differential inputs and outputs,

comprehensive click-and-pop suppression, shutdown

control, and soft-start circuitry. The MAX9730 is fully

specified over the -40°C to +85°C extended tempera-

ture range and is available in ultra-small, lead-free,

20-bump WLP (2mm x 2.5mm) and 28-pin TQFN (4mm

x 4mm) packages.

Features

o 2.7V to 5.5V Operation

o Integrated Charge-Pump Power Supply

o Clickless/Popless Operation

o Small Thermally Efficient Packages

2mm x 2.5mm 20-Bump WLP

4mm x 4mm 28-Pin TQFN

2.4W, Single-Supply, Class G Power Amplifier

________________________________________________________________

Maxim Integrated Products

1

PART

PIN-PACKAGE

TEMP RANGE

MAX9730EWP+TG45

20 WLP

-40°C to +85°C

MAX9730ETI+

28 TQFN-EP*

-40°C to +85°C

Ordering Information

MAX9730

+

IN+

FB+

2.7V TO 5.5V

IN-

FB-

OUT+

OUT-

-

CLASS G

OUTPUT

STAGE

CHARGE

PUMP

CPGND

GND

Simplified Block Diagram

19-0701; Rev 5; 3/10

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

MP3 Players

Personal Media Players

Handheld Gaming

Consoles

Cell Phones

Smartphones

Notebook Computers

Applications

Typical Application Circuit/Functional Diagram and Pin

Configurations appear at end of data sheet.

+

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

T = Tape and reel.

G45 indicates protective die coating.

*

EP = Exposed pad.