19-4341; Rev 3; 7/11
Automotive DirectDrive Headphone Amplifiers
with Output Protection and Diagnostics
General Description
The MAX13330/MAX13331 stereo headphone amplifiers
are designed for automotive applications requiring out-
put short-circuit and ESD protection to battery/ground
with diagnostics. These devices use Maxim’s unique
DirectDrive
®
architecture to produce a ground-refer-
enced 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 exter-
nally 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 effi-
cient integrated charge pump allows the device to drive
loads as low as 8Ω, enabling the use of small loud-
speakers. 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 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.
♦
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)
♦
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
Features
MAX13330/MAX13331
Ordering Information
PART
MAX13330GEE/V+T
MAX13331GEE/V+T
GAIN
-1.5V/V
TEMP
RANGE
PIN-
PACKAGE
-40°C to +105°C 16 QSOP
Applications
Automotive Entertainment Systems
Automotive Rear Seat Entertainment Systems
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Externally
-40°C to +105°C 16 QSOP
Set
/V denotes an automotive qualified part.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Typical Application Circuits appear at end of data sheet.
Simplified Block Diagram
INL
MAX13330
LEFT-CHANNEL
AUDIO IN
Pin Configuration
1
2
3
4
5
6
7
8
MAX13330
MAX13331
+
16
15
14
13
12
11
10
9
OUTL
PGND
V
SS
OUTR
DIAG
CPVSS
C1N
PGND
SGND
OUTPUT PROTECTION & DIAGNOSTICS
INR
SGND
DIAGNOSTICS
OUTPUT
SHDN
CLICK-AND-POP
SUPPRESSION
V
DD
SHDN
CPVDD
C1P
RIGHT-CHANNEL
AUDIO IN
QSOP
________________________________________________________________
Maxim Integrated Products
1
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.
Automotive DirectDrive Headphone Amplifiers
with Output Protection and Diagnostics
MAX13330/MAX13331
ABSOLUTE MAXIMUM RATINGS
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 (V
DD
+ 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)
QSOP (derate 9.6mW/°C above +70°C))..................771.5mW
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
Soldering Temperature (reflow) .......................................+260°C
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
QSOP
Junction-to-Ambient Thermal Resistance (θ
JA
) ......103.7°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ................37°C/W
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
www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
DD
= V
CPVDD
= +5V, V
SGND
= V
PGND
= 0V,
SHDN
= V
DD
, C1 = C2 = 1µF, R
L
=
∞,
resistive load referenced to ground, for
MAX13330 gain = -1.5V/V (internally set), for MAX13331 gain = -1.5V/V (R
IN
= 30kΩ, R
FB
= 45kΩ), T
A
= T
J
= -40°C to +105°C, unless
otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
GENERAL
Amplifier Supply Voltage Range
Charge-Pump Supply Voltage
Range
Charge-Pump Output Voltage
Quiescent Supply Current
Shutdown Supply Current
SHDN
Input-Logic High
SHDN
Input-Logic Low
SHDN
Input Leakage Current
SHDN
to Full Operation Time
DIAGNOSTICS
No fault
OUTR short to
SGND
Diagnostic Output Voltage
V
DIAG
R
DIAG
= ,
T
A
= +25°C
OUTL short to
SGND
OUTR short to
V
BAT
OUTL short to
V
BAT
0.22 x
V
DD
0.47 x
V
DD
0.72 x
V
DD
0.97 x
V
DD
0.25 x
V
DD
0.50 x
V
DD
0.75 x
V
DD
0.02 x
V
DD
0.28 x
V
DD
0.53 x
V
DD
0.78 x
V
DD
V
t
SON
V
DD
V
CPVDD
V
CPVSS
I
DD
I
SHDN
V
IH
V
IL
-1
100
2
0.8
+1
R
L
=
4.0
4.0
-V
DD
10
10
5.5
5.5
V
V
V
mA
μA
V
V
μA
μs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Automotive DirectDrive Headphone Amplifiers
with Output Protection and Diagnostics
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= V
CPVDD
= +5V, V
SGND
= V
PGND
= 0V,
SHDN
= V
DD
, C1 = C2 = 1µF, R
L
=
∞,
resistive load referenced to ground, for
MAX13330 gain = -1.5V/V (internally set), for MAX13331 gain = -1.5V/V (R
IN
= 30kΩ, R
FB
= 45kΩ), T
A
= T
J
= -40°C to +105°C, unless
otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
Short-to-SGND Threshold
Short-to-V
BAT
Threshold
AMPLIFIERS
Voltage Gain
Gain Matching
Input Offset Voltage
Input Bias Current
Input Impedance
Power-Supply Rejection Ratio
R
IN
PSRR
V
IN_
= 0V
MAX13330
DC, V
DD
= 4.0V to 5.5V, input referred
f =1kHz, V
RIPPLE
= 100mV
P-P
THD+N = 1%;
V
DD
= V
CPVDD
= 5V;
f
IN
= 1kHz
R
L
= 1k
R
L
= 16 , P
OUT
= 100mW, f = 1kHz
R
L
= 32 , P
OUT
= 125mW, f = 1kHz
R
L
= 32 , P
OUT
= 135mW, f = 22Hz to 22kHz
f = 22Hz to 22kHz bandwidth; inputs
AC-coupled to grounded
No sustained oscillation
Peak voltage, T
A
=
+25°C, A-weighted,
32 samples per
second; Inputs AC-
coupled to ground
Into shutdown
-80
dB
Out of shutdown
1.9
R
L
= 32 , V
IN
= 200mV
P-P
, f = 10kHz
-60
2.2
-75
+155
10
Human Body Model (OUTR and OUTL)
±15
2.5
MHz
dB
°C
°C
kV
R
L
= 8
R
L
= 16
R
L
= 32
20
A
V
MAX13330
MAX13330
-1.48
-1.5
±0.2
±1
50
30
-86
-80
75
120
135
2
14
THD+N
SNR
V
n
SR
C
L
0.03
0.01
100
6
0.3
3000
V
RMS
k
%
%
dB
μV
RMS
V/μs
pF
mW
±6
-1.52
V/V
%
mV
nA
k
dB
SYMBOL
CONDITIONS
MIN
130
130
TYP
MAX
UNITS
mA
mA
MAX13330/MAX13331
Output Power Per Channel
Output Voltage
Output Impedance in Shutdown
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Noise
Slew Rate
Maximum Capacitive Load
P
OUT_
V
OUT_
Click-and-Pop Level
K
CP
Charge-Pump Oscillator
Frequency
Crosstalk
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
ESD Protection
f
OSC
Note 2:
All devices are 100% tested at T
A
= +25°C; specifications over temperature limits are guaranteed by design and QA
sampling.
_______________________________________________________________________________________
3
Automotive DirectDrive Headphone Amplifiers
with Output Protection and Diagnostics
MAX13330/MAX13331
Typical Operating Characteristics
(V
DD
= V
CPVDD
= 5V, V
SGND
= V
PGND
= 0V, C1 = C2 = 1µF, R
L
=
∞,
gain = -1.5V/V, THD+N measurement bandwidth = 22Hz to 22kHz,
T
A
= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX13330/31 toc01
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX13330/31 toc02
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
V
DD
= 4V
R
L
= 16Ω
MAX13330/31 toc03
1
V
DD
= 4V
R
L
= 8Ω
P
OUT
= 25mW
1
V
DD
= 5V
R
L
= 8Ω
1
0.1
THD+N (%)
0.1
THD+N (%)
P
OUT
= 25mW
THD+N (%)
0.1
P
OUT
= 25mW
0.01
P
OUT
= 45mW
0.01
P
OUT
= 60mW
0.01
P
OUT
= 75mW
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX13330/31 toc04
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX13330/31 toc05
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
V
DD
= 5V
R
L
= 32Ω
MAX13330/31 toc06
1
V
DD
= 5V
R
L
= 16Ω
1
V
DD
= 4V
R
L
= 32Ω
1
0.1
THD+N (%)
THD+N (%)
P
OUT
= 25mW
THD+N (%)
P
OUT
= 50mW
0.1
0.1
P
OUT
= 50mW
0.01
P
OUT
= 100mW
0.01
P
OUT
= 70mW
0.01
P
OUT
= 125mW
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX13330/31 toc07
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX13330/31 toc08
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
V
DD
= 4V
R
L
= 16Ω
1
f
IN
= 10kHz
THD+N (%)
f
IN
= 1kHz
0.1
MAX13330/31 toc09
10
V
DD
= 4V
R
L
= 8Ω
10
V
DD
= 5V
R
L
= 8Ω
10
1
THD+N (%)
f
IN
= 1kHz
f
IN
= 10kHz
THD+N (%)
1
f
IN
= 1kHz
0.1
0.01
f
IN
= 100Hz
f
IN
= 100Hz
0.01
0
25
50
75
0
25
50
75
100
125
OUTPUT POWER (mW)
OUTPUT POWER (mW)
0.001
0
25
f
IN
= 10kHz
0.1
f
IN
= 100Hz
50
75
100
125
0.01
OUTPUT POWER (mW)
4
_______________________________________________________________________________________
Automotive DirectDrive Headphone Amplifiers
with Output Protection and Diagnostics
Typical Operating Characteristics (continued)
(V
DD
= V
CPVDD
= 5V, V
SGND
= V
PGND
= 0V, C1 = C2 = 1µF, R
L
=
∞,
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
MAX13330/31 toc10
MAX13330/MAX13331
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX13330/31 toc11
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
V
DD
= 5V
R
L
= 32Ω
1
THD+N (%)
f
IN
= 10kHz
0.1
f
IN
= 1kHz
MAX13330/31 toc12
10
V
DD
= 5V
R
L
= 16Ω
1
THD+N (%)
f
IN
= 10kHz
0.1
f
IN
= 1kHz
10
V
DD
= 4V
R
L
= 32Ω
1
THD+N (%)
f
IN
= 10kHz
0.1
f
IN
= 1kHz
10
0.01
f
IN
= 100Hz
0.001
0
25
50
75
100
125
150
175
OUTPUT POWER (mW)
0.01
f
IN
= 100Hz
0
25
50
75
100
125
0.01
f
IN
= 100Hz
0
25
50
75
100
125
150
175
0.001
0.001
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX13330/31 toc13
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX13330/31 toc14
OUTPUT POWER vs. LOAD RESISTANCE
180
160
OUTPUT POWER (mW)
140
120
100
80
60
40
20
0
1% THD+N
V
DD
= 4V
0
10
100
1000
1% THD+N
V
DD
= 5V
10% THD+N
V
DD
= 4V
f
IN
= 1kHz
10% THD+N
V
DD
= 5V
MAX13330/31 toc15
1
V
DD
= 5V
R
L
= 1kΩ
0.1
THD+N (%)
V
OUT_
= 2V
RMS
180
160
140
OUTPUT POWER (mW)
120
100
80
60
40
20
R
L
= 8Ω
R
L
= 16Ω
R
L
= 32Ω
f
IN
= 1kHz
1% THD+N
200
0.01
V
OUT_
= 1V
RMS
0.001
0.0001
0.01
0.1
1
FREQUENCY (kHz)
10
100
0
4.00
4.25
4.50
4.75
5.00
5.25
5.50
SUPPLY VOLTAGE (V)
LOAD RESISTANCE (Ω)
POWER DISSIPATION vs.
OUTPUT POWER PER CHANNEL
MAX13330/31 toc16
POWER DISSIPATION vs.
OUTPUT POWER PER CHANNEL
V
DD
= 5V
f
IN
= 1kHz
R
L
= 8Ω
800
600
400
200
0
R
L
= 32Ω
R
L
= 16Ω
MAX13330/31 toc17
800
700
POWER DISSIPATION (mW)
600
500
400
300
200
100
0
0
20
40
60
80
100
R
L
= 32Ω
R
L
= 8Ω
R
L
= 16Ω
V
DD
= 4V
f
IN
= 1kHz
1200
1000
POWER DISSIPATION (mW)
120
0
20
40
60
80 100 120 140 160 180
OUTPUT POWER PER CHANNEL (mW)
OUTPUT POWER PER CHANNEL (mW)
_______________________________________________________________________________________
5
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