Rainbow Electronics MAX13331 User Manual

General Description

The MAX13330/MAX13331 stereo headphone amplifiers
are designed for automotive applications requiring out­put short-circuit and ESD protection to battery/ground
with diagnostics. These devices use Maxim’s unique,
patented†DirectDrive®architecture to produce a
ground-referenced output from a single supply, elimi­nating the need for large DC-blocking capacitors, sav­ing board space and component 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 regulator. These devices include
±15kV Human Body Model ESD protection and short­circuit 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 (V

BAT

up to +45V)

Output Protection, Load Dump Protection

♦ Short-Circuit Diagnostic Output

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

(MAX13330)

♦ 135mW per Channel into 32Ω at 1% THD+N

♦ Low 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

MAX13330/MAX13331

Automotive DirectDrive Headphone Amplifiers

with Output Protection and Diagnostics

________________________________________________________________

Maxim Integrated Products

1

Pin Configuration

Simplified Block Diagram

19-4341; Rev 0; 10/08

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.

DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.

†

U.S. Patent #7,061,327

Ordering Information

+

Denotes a lead-free/RoHS-compliant package.
T = Tape-and-reel.
/V denotes an automotive qualified part.

Typical Application Circuits appear at end of data sheet.

PART

TEMP

RANGE

PIN-

PACKAGE

M A X1 3 3 3 0 GE E /V + T

16 QSOP

M A X1 3 3 3 1 GE E /V + T

E xter nal l y

Set

16 QSOP

GAIN

-1.5V/V - 40°C to + 105°C

- 40°C to + 105°C

LEFT-CHANNEL

RIGHT-CHANNEL

AUDIO IN

SHDN

AUDIO IN

INL

MAX13330

CLICK-AND-POP

SUPPRESSION

OUTPUT PROTECTION & DIAGNOSTICS

DIAGNOSTICS
OUTPUT

SGND

INR

SGND

V

SHDN

CPVDD

C1P

1

2

3

4

DD

6

7

8

+

MAX13330
MAX13331

QSOP

16

15

14

13

125

11

10

9

OUTL

PGND

V

SS

OUTR

DIAG

CPVSS

C1N

PGND

MAX13330/MAX13331

Automotive DirectDrive Headphone Amplifiers
with Output Protection and Diagnostics

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= V

CPVDD

= +5V, V

SGND

= V

PGND

= 0, SHDN = VDD, C1 = C2 = 1µF, RL= ∞, resistive load referenced to ground, for

MAX13330 gain = -1.5V/V (internally set), for MAX13331 gain = -1.5V/V (R

IN

= 30kΩ, RFB= 45kΩ), TA= TJ= -40°C to +105°C, unless

otherwise noted. Typical values are at T

A

= +25°C, unless otherwise noted.) (Note 2)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to http://www.maxim-ic.com/thermal-tutorial

.

V

DD

, CPVDD to SGND..............................................-0.3V to +6V

V

SS

, CPVSS to SGND ...............................................+0.3V to -6V

V

DD

, CPVDD ............................................................-0.3V to 0.3V

V

SS

, CPVSS..............................................................-0.3V to 0.3V

SHDN, DIAG to SGND................................-0.3V to (V

DD

+ 0.3V)

OUT_ to PGND.......................................(V

CPVSS

- 0.3V) to +45V

IN_ to SGND (MAX13330)................(V

SS

- 0.3V) to (VDD+ 0.3V)

IN_ to SGND (MAX13331)..........................-0.3V to (V

DD

+ 0.3V)

C1P to PGND.........................................-0.3V to (V

CPVDD

+0.3V)

C1N to PGND.............................................(V

SS

- 0.3V) to + 0.3V

Output Short-Circuit Duration.....................................Continuous

Continuous Power Dissipation (T

A

= +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)) ......666.7mW

Junction-to-Case Thermal Resistance (θ

JC

) (Note 1)

θ

JC

............................................................................... 37°C/W

Junction-to-Ambient Thermal Resistance (θ

JA

) (Note 1)

θ

JA

............................................................................. 120°C/W

Operating Temperature Range .........................-40°C to +105°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

CONDITIONS

UNITS

GENERAL

Amplifier Supply Voltage Range V

DD

4.0 5.5 V

Charge-Pump Supply Voltage
Range

4.0 5.5 V

Charge-Pump Output Voltage

V

Quiescent Supply Current I

DD

RL = ∞ 10 mA

Shutdown Supply Current I

SHDN

10 µA

SHDN Input-Logic High V

IH

2V

SHDN Input-Logic Low V

IL

0.8 V

SHDN Input Leakage Current -1 +1 µA
SHDN to Full Operation Time t

SON

µs

DIAGNOSTICS

No fault

0.02 x

OUTR short to
SGND

0.22 x

0.25 x

0.28 x

OUTL short to
SGND

0.47 x

0.50 x

0.53 x

OUTR short to
V

BAT

0.72 x

0.75 x

0.78 x

Diagnostic Output Voltage V

DIAG

R

DIAG

= ∞,

T

A

= +25°C

OUTL short to
V

BAT

0.97 x

V

Short-to-SGND Threshold

mA

Short-to-V

BAT

Threshold

mA

SYMBOL

MIN TYP MAX

V

CPVDD

V

CPVSS

-V

DD

100

V

DD

V

DD

V

DD

V

DD

V

DD

V

DD

130

130

V

DD

V

DD

V

DD

V

DD

V

DD

MAX13330/MAX13331

Automotive DirectDrive Headphone Amplifiers

with Output Protection and Diagnostics

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= V

CPVDD

= +5V, V

SGND

= V

PGND

= 0, SHDN = VDD, C1 = C2 = 1µF, RL= ∞, resistive load referenced to ground, for

MAX13330 gain = -1.5V/V (internally set), for MAX13331 gain = -1.5V/V (R

IN

= 30kΩ, RFB= 45kΩ), TA= TJ= -40°C to +105°C, unless

otherwise noted. Typical values are at T

A

= +25°C, unless otherwise noted.) (Note 2)

PARAMETER

CONDITIONS

UNITS

AMPLIFIERS

Voltage Gain A

V

MAX13330

V/V

Gain Matching MAX13330

%

Input Offset Voltage ±1 ±6 mV

Input Bias Current V

IN_

= 0 50 nA

Input Impedance R

IN

MAX13330 20 30 kΩ

DC, V

DD

= 4.0V to 5.5V, input referred -86 dB

Power-Supply Rejection Ratio PSRR

f =1kHz, V

RIPPLE

= 100mV

P-P

-80 dB

RL = 8Ω 75

RL = 16Ω

Output Power Per Channel P

OUT_

THD+N = 1%;
V

DD

= V

CPVDD

= 5V;

f

IN

= 1kHz

R

L

= 32Ω

mW

Output Voltage V

OUT_

RL = 1kΩ 2

V

RMS

Output Impedance in Shutdown 14 kΩ

RL = 16Ω, P

OUT

= 100mW, f = 1kHz

%

Total Harmonic Distortion Plus
Noise

RL = 32Ω, P

OUT

= 125mW, f = 1kHz

%

Signal-to-Noise Ratio SNR

dB

Noise V

n

f = 22Hz to 22kHz bandwidth; inputs
AC-coupled to grounded

6

µV

RMS

Slew Rate SR 0.3 V/µs

Maximum Capacitive Load C

L

No sustained oscillation

pF

Into shutdown -80

Click-and-Pop Level K

CP

Peak voltage, TA =
+25°C, A-weighted,
32 samples per
second; Inputs AC­coupled to ground

Out of shutdown -60

V

Charge-Pump Oscillator
Frequency

f

OSC

1.9 2.2 2.5 MHz

Crosstalk RL = 32Ω, VIN = 200mV

P-P

, f = 10kHz -75 dB

Thermal-Shutdown Temperature

°C

Thermal-Shutdown Hysteresis 10 °C

ESD Protection Human Body Model (OUTR and OUTL)

kV

Note 2: All devices are 100% tested at TA= +25°C; specifications over temperature limits are guaranteed by design and QA

sampling.

SYMBOL

THD+N

RL = 32Ω , P

= 135m W , f = 22H z to 22kH z 100

OU T

MIN TYP MAX

-1.48 -1.5 -1.52

±0.2

120

135

0.03

0.01

+155

±15

3000

MAX13330/MAX13331

Automotive DirectDrive Headphone Amplifiers
with Output Protection and Diagnostics

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VDD= V

CPVDD

= 5V, V

SGND

= V

PGND

= 0, C1 = C2 = 1µF, RL= ∞, gain = -1.5V/V, THD+N measurement bandwidth = 22Hz to 22kHz,

T

A

= +25°C, unless otherwise noted.)

1

0.1

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

VDD = 4V

= 8Ω

R

L

P

= 25mW

OUT

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

1

VDD = 4V

= 16Ω

R

L

0.1
P

OUT

= 25mW

MAX13330/31 toc01

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

1

VDD = 5V

= 8Ω

R

L

P

0.1

OUT

= 25mW

MAX13330/31 toc02

MAX13330/31 toc03

THD+N (%)

0.01

0.001

0.01 100

THD+N (%)

0.001

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

1

VDD = 5V

= 16Ω

R

L

0.1

0.01

0.01 100

P

= 45mW

OUT

0.1 1 10
FREQUENCY (kHz)

P

= 50mW

OUT

P

= 100mW

OUT

0.1 1 10
FREQUENCY (kHz)

THD+N (%)

0.001

MAX13330/31 toc04

THD+N (%)

0.001

0.01

0.01 100

1

VDD = 4V
R

0.1

0.01

0.01 100

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. OUTPUT POWER

10

VDD = 4V

= 8Ω

R

L

1

fIN = 1kHz

THD+N (%)

0.1

0.01
0 75

fIN = 10kHz

fIN = 100Hz

5025

OUTPUT POWER (mW)

MAX13330/31 toc07

THD+N (%)

10

VDD = 5V
R

1

fIN = 1kHz

0.1

0.01
0 125

P

= 60mW

OUT

0.1 1 10
FREQUENCY (kHz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

= 32Ω

L

P

= 25mW

OUT

P

= 70mW

OUT

0.1 1 10
FREQUENCY (kHz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. OUTPUT POWER

= 8Ω

L

fIN = 10kHz

fIN = 100Hz

50 10025 75

OUTPUT POWER (mW)

THD+N (%)

0.001

MAX13330/31 toc05

THD+N (%)

0.001

MAX13330/31 toc08

THD+N (%)

0.001

0.01

0.01 100

0.1 1 10

P

= 75mW

OUT

FREQUENCY (kHz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

1

VDD = 5V

= 32Ω

R

L

0.1
P

= 50mW

OUT

0.01

P

= 125mW

OUT

0.01 100

0.1 1 10
FREQUENCY (kHz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. OUTPUT POWER

10

VDD = 4V

= 16Ω

R

L

1

fIN = 1kHz

0.1

0.01

0 125

fIN = 10kHz

fIN = 100Hz

50 10025 75

OUTPUT POWER (mW)

MAX13330/31 toc06

MAX13330/31 toc09

MAX13330/MAX13331

Automotive DirectDrive Headphone Amplifiers

with Output Protection and Diagnostics

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VDD= V

CPVDD

= 5V, V

SGND

= V

PGND

= 0, C1 = C2 = 1µF, RL= ∞, gain = -1.5V/V, THD+N measurement bandwidth = 22Hz to 22kHz,

T

A

= +25°C, unless otherwise noted.)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. OUTPUT POWER

10

VDD = 5V

= 16Ω

R

L

1

fIN = 10kHz

fIN = 1kHz

0.1

THD+N (%)

0.01

fIN = 100Hz

0.001
0 10075 175

OUTPUT POWER (mW)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

1

VDD = 5V

= 1kΩ

R

L

V

= 2V

OUT_

0.1

V

0.01

THD+N (%)

0.001

0.0001

= 1V

OUT_

RMS

0.01 100

0.1 1 10
FREQUENCY (kHz)

RMS

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. OUTPUT POWER

10

VDD = 4V

= 32Ω

R

L

MAX13330/31 toc10

12550 15025

1

fIN = 10kHz

fIN = 1kHz

0.1

THD+N (%)

0.01

0.001

fIN = 100Hz

0 125

50 10025 75

OUTPUT POWER (mW)

MAX13330/31 toc11

THD+N (%)

0.001

OUTPUT POWER vs. SUPPLY VOLTAGE

180

fIN = 1kHz

160

1% THD+N

140

MAX13330/31 toc13

120

100

80

60

OUTPUT POWER (mW)

40

20

RL = 32Ω

RL = 16Ω

RL = 8Ω

0

4.00 5.50
SUPPLY VOLTAGE (V)

5.254.754.50 5.004.25

MAX13330/31 toc14

OUTPUT POWER (mW)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. OUTPUT POWER

10

VDD = 5V

= 32Ω

R

L

1

fIN = 10kHz

0.1

0.01

fIN = 1kHz

fIN = 100Hz

0 10075 175

OUTPUT POWER (mW)

OUTPUT POWER vs. LOAD RESISTANCE

200

fIN = 1kHz

180

160

140

1% THD+N

= 5V

V

DD

120

100

80

60

40

20

0

0 1000

1% THD+N

= 4V

V

DD

10 100

LOAD RESISTANCE (Ω)

12550 15025

10% THD+N

= 5V

V

DD

10% THD+N

= 4V

V

DD

MAX13330/31 toc12

MAX13330/31 toc15

POWER DISSIPATION vs.

OUTPUT POWER PER CHANNEL

800

700

600

RL = 8Ω

500

400

300

POWER DISSIPATION (mW)

200

100

0

0 120

OUTPUT POWER PER CHANNEL (mW)

RL = 16Ω

RL = 32Ω

VDD = 4V

= 1kHz

f

IN

1006040 8020

1200

1000

MAX13330/31 toc16

800

600

400

POWER DISSIPATION (mW)

200

0

POWER DISSIPATION vs.

OUTPUT POWER PER CHANNEL

VDD = 5V

= 1kHz

f

IN

RL = 8Ω

0 180

OUTPUT POWER PER CHANNEL (mW)

RL = 16Ω

RL = 32Ω

80 14060 120 16020 10040

MAX13330/31 toc17