General Description
The MAX4411 fixed-gain, stereo headphone amplifier is
designed for portable equipment where board space is
at a premium. The MAX4411 uses a unique, patented
DirectDrive architecture to produce a ground-refer-
enced output from a single supply, eliminating the need
for large DC-blocking capacitors, saving cost, board
space, and component height. Additionally, the gain of
the amplifier is set internally (-1.5V/V, MAX4411 and
-2V/V, MAX4411B), further reducing component count.
The MAX4411 delivers up to 80mW per channel into a
16
load and has low 0.003% THD+N. An 86dB at
217Hz power-supply rejection ratio (PSRR) allows this
device to operate from noisy digital supplies without an
additional linear regulator. The MAX4411 includes
8kV
ESD protection on the headphone outputs. Com-
prehensive click-and-pop circuitry suppresses audible
clicks and pops on startup and shutdown. Independent
left/right, low-power shutdown controls make it possible
to optimize power savings in mixed-mode, mono/stereo
applications.
The MAX4411 operates from a single 1.8V to 3.6V supply,
consumes only 5mA of supply current, has short-circuit
and thermal-overload protection, and is specified over the
extended -40C to +85C temperature range. The
MAX4411 is available in a tiny (2mm
2mm
0.6mm),
16-bump chip-scale package (UCSPTM) and a 20-pin thin
QFN package (4mm
4mm
0.8mm).
Applications
Features
o No Bulky DC-Blocking Capacitors Required
o Fixed -1.5V/V Gain Eliminates External Feedback
Network
MAX4411: -1.5V/V
MAX4411B: -2V/V
o Ground-Referenced Outputs Eliminate DC-Bias
Voltages on Headphone Ground Pin
o No Degradation of Low-Frequency Response Due
to Output Capacitors
o 80mW per Channel into 16
o Low 0.003% THD+N
o High PSRR (86dB at 217Hz)
o Integrated Click-and-Pop Suppression
o 1.8V to 3.6V Single-Supply Operation
o Low Quiescent Current (5mA)
o Independent Left/Right, Low-Power
Shutdown Controls
o Short-Circuit and Thermal-Overload Protection
o 8kV ESD-Protected Amplifier Outputs
o Available in Space-Saving Packages
16-Bump UCSP (2mm
2mm
0.6mm)
20-Pin Thin QFN (4mm
4mm
0.8mm)
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
________________________________________________________________ Maxim Integrated Products
1
LEFT
AUDIO
INPUT
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
FIXED GAIN ELIMINATES
EXTERNAL RESISTOR
NETWORK
RIGHT
AUDIO
INPUT
SHDNL
SHDNR
MAX4411
Functional Diagram
Ordering Information
19-2618; Rev 1; 4/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
PART
TEMP RANGE
PIN/BUMP-
PACKAGE
GAIN
(V/V)
MAX4411EBE-T
-40C to +85C
16 UCSP-16
-1.5
MAX4411ETP
-40C to +85C
20 Thin QFN
-1.5
MAX4411BEBE-T
-40C to +85C
16 UCSP-16
-2
MAX4411BETP
-40C to +85C
20 Thin QFN
-2
Notebook PCs
Cellular Phones
PDAs
MP3 Players
Smart Phones
Portable Audio Equipment
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations and Typical Application Circuit appear at end of data sheet.
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(PV
DD
= SV
DD
= 3V, PGND = SGND = 0V, SHDNL = SHDNR = SV
DD
, C1 = C2 = 2.2F, C
IN
= 1F, R
L
=
, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
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.
PGND to SGND .....................................................-0.3V to +0.3V
PV
DD
to SV
DD .................................................................
-0.3V to +0.3V
PV
SS
to SV
SS
.........................................................-0.3V to +0.3V
PV
DD
and SV
DD
to PGND or SGND .........................-0.3V to +4V
PV
SS
and SV
SS
to PGND or SGND ..........................-4V to +0.3V
IN_ to SGND ................................(SV
SS
- 0.3V) to (SV
DD
+ 0.3V)
SHDN_ to SGND........................(SGND - 0.3V) to (SV
DD
+ 0.3V)
OUT_ to SGND .............................(SV
SS
- 0.3V) to (SV
DD
+0.3V)
C1P to PGND.............................(PGND - 0.3V) to (PV
DD
+ 0.3V)
C1N to PGND .............................(PV
SS
- 0.3V) to (PGND + 0.3V)
Output Short Circuit to GND or V
DD
...........................Continuous
Continuous Power Dissipation (T
A
= +70C)
16-Bump UCSP (derate 7.4mW/C above +70C)........589mW
20-Pin Thin QFN (derate 16.9mW/C above +70C) ..1349mW
Junction Temperature ......................................................+150C
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Bump Temperature (soldering)
Reflow ..........................................................................+230C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
DD
Guaranteed by PSRR test
1.8
3.6
V
One channel enabled
3.2
Quiescent Supply Current
I
DD
Two channels enabled
5
8.4
mA
Shutdown Supply Current
I
SHDN
SHDNL = SHDNR = GND
6
10
A
V
IH
0.7 x
SV
DD
SHDN_ Thresholds
V
IL
0.3 x
SV
DD
V
SHDN_ Input Leakage Current
-1
+1
A
SHDN_ to Full Operation
t
SON
175
s
CHARGE PUMP
Oscillator Frequency
f
OSC
272
320
368
kHz
AMPLIFIERS
MAX4411
-1.55
-1.5
-1.45
Voltage Gain
A
V
MAX4411B
-2.1
-2
-1.9
V/V
Gain Match
A
V
1
%
MAX4411
0.7
2.8
Total Output Offset Voltage
V
OS
Input AC-coupled
MAX4411B
0.75
3.0
mV
Input Resistance
R
IN
10
14
19
k
1.8V
V
DD
3.6V,
MAX4411
DC (Note 2)
72
86
f
RIPPLE
= 217Hz
86
f
RIPPLE
= 1kHz
75
Power-Supply Rejection Ratio
PSRR
V
DD
= 3.0V, 200mV
P-P
ripple, MAX4411
(Note 3)
f
RIPPLE
= 20kHz
53
dB
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(PV
DD
= SV
DD
= 3V, PGND = SGND = 0V, SHDNL = SHDNR = SV
DD
, C1 = C2 = 2.2F, C
IN
= 1F, R
L
=
, T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
Note 1: All specifications are 100% tested at T
A
= +25C; temperature limits are guaranteed by design.
Note 2: Inputs are connected directly to GND.
Note 3: Inputs are AC-coupled to ground.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
1.8V
V
DD
3.6V,
MAX4411B
DC (Note 2)
69
86
f
RIPPLE
= 217Hz
86
f
RIPPLE
= 1kHz
73
Power-Supply Rejection Ratio
PSRR
V
DD
= 3.0V, 200mV
P-P
ripple, MAX4411B
(Note 3)
f
RIPPLE
= 20kHz
51
dB
R
L
= 32
65
Output Power
P
OUT
THD+N
1%
T
A
= +25C
R
L
= 16
55
80
mW
R
L
= 32
, P
OUT
=
50mW
0.003
Total Harmonic Distortion Plus
Noise
THD+N
f
IN
= 1kHz
R
L
= 16
, P
OUT
=
60mW
0.004
%
MAX4411
94
Signal-to-Noise Ratio
SNR
R
L
= 32
, P
OUT
=
20mW, f
IN
= 1kHz,
BW = 22Hz to 22kHz
MAX4411B
95
dB
Slew Rate
SR
0.8
V/s
Maximum Capacitive Load
C
L
No sustained oscillations
150
pF
Crosstalk
R
L
= 16
, P
OUT
= 1.6mW, f
IN
= 10kHz
90
dB
Thermal Shutdown Threshold
140
C
Thermal Shutdown Hysteresis
15
C
ESD Protection
Human Body Model (OUTR, OUTL)
8
kV
Typical Operating Characteristics
(
C1 = C2 = 2.2F, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25C, unless otherwise noted.
)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc01
FREQUENCY (Hz)
THD+N (%)
10k
1k
100
0.01
0.1
1
0.001
10
100k
V
DD
= 3V
R
L
= 16
P
OUT
= 10mW
P
OUT
= 25mW
P
OUT
= 50mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc02
FREQUENCY (Hz)
THD+N (%)
10k
1k
100
0.01
0.1
1
0.001
10
100k
P
OUT
= 5mW
P
OUT
= 10mW
P
OUT
= 25mW
V
DD
= 3V
R
L
= 32
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc03
FREQUENCY (Hz)
THD+N (%)
10k
1k
100
0.01
0.1
1
0.001
10
100k
P
OUT
= 5mW
P
OUT
= 10mW
P
OUT
= 20mW
V
DD
= 1.8V
R
L
= 16
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
4
_______________________________________________________________________________________
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc04
FREQUENCY (Hz)
THD+N (%)
10k
1k
100
0.01
0.1
1
0.001
10
100k
P
OUT
= 5mW
P
OUT
= 10mW
P
OUT
= 20mW
V
DD
= 1.8V
R
L
= 32
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc05
OUTPUT POWER (mW)
THD+N (%)
150
100
50
0.01
0.1
1
10
100
0.001
0
200
V
DD
= 3V
R
L
= 16
f
IN
= 20Hz
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc06
OUTPUT POWER (mW)
THD+N (%)
150
100
50
0.01
0.1
1
10
100
0.001
0
200
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 3V
R
L
= 16
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc07
OUTPUT POWER (mW)
THD+N (%)
150
100
50
0.01
0.1
1
10
100
0.001
0
200
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 3V
R
L
= 16
f
IN
= 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc08
OUTPUT POWER (mW)
THD+N (%)
100
75
50
25
0.01
0.1
1
10
100
0.001
0
125
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 3V
R
L
= 32
f
IN
= 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc09
OUTPUT POWER (mW)
THD+N (%)
100
75
50
25
0.01
0.1
1
10
100
0.001
0
125
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 3V
R
L
= 32
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc10
OUTPUT POWER (mW)
THD+N (%)
100
75
50
25
0.01
0.1
1
10
100
0.001
0
125
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 3V
R
L
= 32
f
IN
= 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc11
OUTPUT POWER (mW)
THD+N (%)
50
40
30
20
10
0.01
0.1
1
10
100
0.001
0
60
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 1.8V
R
L
= 16
f
IN
= 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc12
OUTPUT POWER (mW)
THD+N (%)
50
40
30
20
10
0.01
0.1
1
10
100
0.001
0
60
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 1.8V
R
L
= 16
f
IN
= 1kHz
Typical Operating Characteristics (continued)
(
C1 = C2 = 2.2F, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25C, unless otherwise noted.
)
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
_______________________________________________________________________________________
5
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc16
OUTPUT POWER (mW)
THD+N (%)
40
30
20
10
0.01
0.1
1
10
100
0.001
0
50
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 1.8V
R
L
= 32
f
IN
= 10kHz
CROSSTALK vs. FREQUENCY
MAX4411 toc21
FREQUENCY (Hz)
CROSSTALK (dB)
10k
1k
100
-120
-100
-80
-60
-40
-20
0
-140
10
100k
V
DD
= 3V
P
OUT
= 1.6mW
R
L
= 16
LEFT TO RIGHT
RIGHT TO LEFT
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc13
OUTPUT POWER (mW)
THD+N (%)
50
40
30
20
10
0.01
0.1
1
10
100
0.001
0
60
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 1.8V
R
L
= 16
f
IN
= 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc14
OUTPUT POWER (mW)
THD+N (%)
40
30
20
10
0.01
0.1
1
10
100
0.001
0
50
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 1.8V
R
L
= 32
f
IN
= 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc15
OUTPUT POWER (mW)
THD+N (%)
40
30
20
10
0.01
0.1
1
10
100
0.001
0
50
OUTPUTS IN
PHASE
OUTPUTS 180
OUT OF PHASE
ONE CHANNEL
DRIVEN
V
DD
= 1.8V
R
L
= 32
f
IN
= 1kHz
Typical Operating Characteristics (continued)
(
C1 = C2 = 2.2F, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25C, unless otherwise noted.
)
0
-100
10
100
1k
10k
100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-80
MAX4411 toc17
FREQUENCY (Hz)
PSRR (dB)
-60
-40
-20
-30
-50
-70
-90
-10
V
DD
= 3V
R
L
= 16
0
-100
10
100
1k
10k
100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-80
MAX4411 toc18
FREQUENCY (Hz)
PSRR (dB)
-60
-40
-20
-30
-50
-70
-90
-10
V
DD
= 1.8V
R
L
= 16
0
-100
10
100
1k
10k
100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-80
MAX4411 toc19
FREQUENCY (Hz)
PSRR (dB)
-60
-40
-20
-30
-50
-70
-90
-10
V
DD
= 3V
R
L
= 32
10
100
1k
10k
100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc20
FREQUENCY (Hz)
V
DD
= 1.8V
R
L
= 32
0
-100
-80
PSRR (dB) -60
-40
-20
-30
-50
-70
-90
-10
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