General Description

The MAX13330/MAX13331 stereo headphone ampli-

fiers are designed for automotive applications requiring

output short-circuit and ESD protection to battery/ground

with diagnostics. These devices use Maxim’s unique

DirectDrive® architecture to produce a ground-referenced

output from a single supply, eliminating the need for large

DC-blocking capacitors, saving board space and com-

ponent height. The gain of the amplifier is set internally

(-1.5V/V) on the MAX13330 or adjusted externally with

resistors on the MAX13331.

The MAX13330/MAX13331 deliver 120mW per channel

into a 16Ω load or 135mW into a 32Ω load and have a low

0.01% THD+N. Low output impedance and the efficient

integrated charge pump allows the device to drive loads

as low as 8Ω, enabling the use of small loudspeakers. An

80dB at 217Hz PSRR allows these devices to operate

from noisy digital supplies without an additional linear reg-

ulator. These devices include ±15kV Human Body Model

ESD protection and short-circuit protection up to +45V at

the headphone outputs. Comprehensive click-and-pop

circuitry suppresses audible clicks and pops on startup

and shutdown. A low-power shutdown mode reduces the

supply current to 3μA (typ).

The MAX13330/MAX13331 are specified from -40°C to

+105°C AEC-Q100 Level 2 automotive temperature range

and are available in a 16-pin QSOP package.

Applications

● Automotive Entertainment Systems

● Automotive Rear Seat Entertainment Systems

Features

● 4V to 5.5V Single-Supply Operation

● 2MHz Charge Pump Prevents AM Radio Interference

● Ground-Referenced Outputs Eliminate Bulky DC-

Blocking Capacitors

● Short-to-Ground and Battery (VBAT up to +45V)

Output Protection, Load Dump Protection

● Short-Circuit Diagnostic Output

● Adjustable Gain (MAX13331) or Fixed -1.5V/V Gain

(MAX13330)

● 125mW per Channel into 32Ω at 0.01% THD+N

● Integrated Click-and-Pop Suppression

● High PSRR Eliminates LDO

● No Degradation of Low-Frequency Response Due

to Output Capacitors

● ±15kV Human Body Model ESD Protection for

Output Pins

19-4341; Rev 5; 3/21

DirectDrive is a registered trademark of Maxim Integrated

Products, Inc.

Typical Application Circuits appear at end of data sheet.

/V denotes an automotive qualified part.

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

T = Tape and reel.

PART

GAIN

TEMP

RANGE

PIN-

PACKAGE

MAX13330GEE/V+T -1.5V/V -40°C to +105°C 16 QSOP

MAX13331GEE/V+T

Externally

Set

-40°C to +105°C 16 QSOP

CLICK-AND-POP

SUPPRESSION

RIGHT-CHANNEL

AUDIO IN

LEFT-CHANNEL

AUDIO IN

MAX13330

DIAGNOSTICS

OUTPUT

SHDN

MAX13330

MAX13331

OUTR

VSS

PGND

OUTL

13

14

15

16

4

3

2

1

SGND

DIAG

12

5

VDD

INR

SGND

INL

QSOP

+

PGND

C1N

CPVSS

9

10

11

8

7

6

C1P

CPVDD

SHDN

MAX13330/MAX13331

Automotive DirectDrive Headphone Amplifiers

with Output Protection and Diagnostics

Simplified Block Diagram

Pin Configuration

Ordering Information

EVALUATION KIT AVAILABLE

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