MAXIM MAX4411 Technical data
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-referenced 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
16Ω 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. Comprehensive 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 -40°C to +85°C temperature range. The
MAX4411 is available in a tiny (2mm ✕ 2mm ✕ 0.6mm),
16-bump chip-scale package (UCSP™) and a 20-pin thin
QFN package (4mm ✕ 4mm ✕ 0.8mm).
Applications
Features
♦ No Bulky DC-Blocking Capacitors Required
♦ Fixed -1.5V/V Gain Eliminates External Feedback
Network
MAX4411: -1.5V/V
MAX4411B: -2V/V
♦ Ground-Referenced Outputs Eliminate DC-Bias
Voltages on Headphone Ground Pin
♦ No Degradation of Low-Frequency Response Due
to Output Capacitors
♦ 80mW per Channel into 16Ω
♦ Low 0.003% THD+N
♦ High PSRR (86dB at 217Hz)
♦ Integrated Click-and-Pop Suppression
♦ 1.8V to 3.6V Single-Supply Operation
♦ Low Quiescent Current (5mA)
♦ Independent Left/Right, Low-Power
Shutdown Controls
♦ Short-Circuit and Thermal-Overload Protection
♦ ±8kV ESD-Protected Amplifier Outputs
♦ 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 2; 9/06
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.
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN/BUMPPACKAGE
GAIN
(V/V)
MAX4411EBE-T
-1.5
MAX4411EBE+T
-1.5
MAX4411ETP
-1.5
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.
Ordering Information continued at end of data sheet.
+Denotes lead-free package.
-40°C to +85°C 16 UCSP-16
-40°C to +85°C 16 UCSP-16
-40°C to +85°C 20 Thin QFN
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(PVDD= SVDD= 3V, PGND = SGND = 0V, SHDNL = SHDNR = SVDD, C1 = C2 = 2.2µF, CIN= 1µF, RL= ∞, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (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 SVSS.........................................................-0.3V to +0.3V
PV
DD
and SVDDto PGND or SGND .........................-0.3V to +4V
PV
SS
and SVSSto PGND or SGND ..........................-4V to +0.3V
IN_ to SGND ................................(SV
SS
- 0.3V) to (SVDD+ 0.3V)
SHDN_ to SGND........................(SGND - 0.3V) to (SV
DD
+ 0.3V)
OUT_ to SGND .............................(SV
SS
- 0.3V) to (SVDD+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
= +70°C)
16-Bump UCSP (derate 7.4mW/°C above +70°C)........589mW
20-Pin Thin QFN (derate 16.9mW/°C above +70°C) ..1349mW
Junction Temperature......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering)
Reflow ..........................................................................+230°C
Lead Temperature (soldering, 10s) .................................+300°C
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 µA
V
IH
0.7 x
SHDN_ Thresholds
V
IL
0.3 x
V
SHDN_ Input Leakage Current -1 +1 µA
SHDN_ to Full Operation t
SON
µs
CHARGE PUMP
Oscillator Frequency f
OSC
368 kHz
AMPLIFIERS
MAX4411
Voltage Gain A
V
MAX4411B
-2
V/V
Gain Match ΔA
V
1%
MAX4411 0.7 2.8
Total Output Offset Voltage V
OS
Input AC-coupled
MAX4411B
3.0
mV
Input Resistance R
IN
10 14 19 kΩ
1.8V ≤ VDD ≤ 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
SV
DD
175
272 320
-1.55 -1.5 -1.45
-2.1
0.75
SV
DD
-1.9
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(PVDD= SVDD= 3V, PGND = SGND = 0V, SHDNL = SHDNR = SVDD, C1 = C2 = 2.2µF, CIN= 1µF, RL= ∞, TA= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: All specifications are 100% tested at T
A
= +25°C; 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 ≤ VDD ≤ 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
RL = 32Ω 65
Output Power P
OUT
THD+N ≤ 1%
T
A
= +25°C
R
L
= 16Ω 55 80
mW
RL = 32Ω, P
OUT
=
50mW
Total Harmonic Distortion Plus
Noise
fIN = 1kHz
R
L
= 16Ω, P
OUT
=
60mW
%
MAX4411 94
Signal-to-Noise Ratio SNR
R
L
= 32Ω, P
OUT
=
20mW, f
IN
= 1kHz,
BW = 22Hz to 22kHz
MAX4411B 95
dB
Slew Rate SR 0.8 V/µs
Maximum Capacitive Load C
L
No sustained oscillations
pF
Crosstalk RL = 16Ω, P
OUT
= 1.6mW, fIN = 10kHz 90 dB
Thermal Shutdown Threshold
°C
Thermal Shutdown Hysteresis 15 °C
ESD Protection Human Body Model (OUTR, OUTL) ±8kV
Typical Operating Characteristics
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc01
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
VDD = 3V
R
L
= 16
Ω
P
OUT
= 10mW
P
OUT
= 25mW
P
OUT
= 50mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc02
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
P
OUT
= 5mW
P
OUT
= 10mW
P
OUT
= 25mW
VDD = 3V
R
L
= 32
Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
P
OUT
= 5mW
P
OUT
= 10mW
P
OUT
= 20mW
VDD = 1.8V
R
L
= 16
Ω
THD+N
0.003
0.004
150
140
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
4 _______________________________________________________________________________________
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc04
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01
0.1
1
0.001
10 100k
P
OUT
= 5mW
P
OUT
= 10mW
P
OUT
= 20mW
VDD = 1.8V
R
L
= 32
Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc05
OUTPUT POWER (mW)
THD+N (%)
15010050
0.01
0.1
1
10
100
0.001
0 200
VDD = 3V
R
L
= 16
Ω
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 (%)
15010050
0.01
0.1
1
10
100
0.001
0200
OUTPUTS IN
PHASE
OUTPUTS 180
°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
R
L
= 16
Ω
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc07
OUTPUT POWER (mW)
THD+N (%)
15010050
0.01
0.1
1
10
100
0.001
0200
OUTPUTS IN
PHASE
OUTPUTS 180
°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
R
L
= 16
Ω
f
IN
= 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc08
OUTPUT POWER (mW)
THD+N (%)
100755025
0.01
0.1
1
10
100
0.001
0 125
OUTPUTS IN
PHASE
OUTPUTS 180
°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
R
L
= 32Ω
f
IN
= 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc09
OUTPUT POWER (mW)
THD+N (%)
100755025
0.01
0.1
1
10
100
0.001
0125
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
R
L
= 32Ω
f
IN
= 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc10
OUTPUT POWER (mW)
THD+N (%)
100755025
0.01
0.1
1
10
100
0.001
0 125
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
R
L
= 32Ω
f
IN
= 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc11
OUTPUT POWER (mW)
THD+N (%)
5040302010
0.01
0.1
1
10
100
0.001
060
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
R
L
= 16Ω
f
IN
= 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc12
OUTPUT POWER (mW)
THD+N (%)
5040302010
0.01
0.1
1
10
100
0.001
060
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
R
L
= 16Ω
f
IN
= 1kHz
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, 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 (%)
40302010
0.01
0.1
1
10
100
0.001
050
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
R
L
= 32Ω
f
IN
= 10kHz
CROSSTALK vs. FREQUENCY
MAX4411 toc21
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-120
-100
-80
-60
-40
-20
0
-140
10 100k
VDD = 3V
P
OUT
= 1.6mW
R
L
= 16Ω
LEFT TO RIGHT
RIGHT TO LEFT
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc13
OUTPUT POWER (mW)
THD+N (%)
5040302010
0.01
0.1
1
10
100
0.001
060
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
R
L
= 16Ω
f
IN
= 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc14
OUTPUT POWER (mW)
THD+N (%)
40302010
0.01
0.1
1
10
100
0.001
050
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
R
L
= 32Ω
f
IN
= 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc15
OUTPUT POWER (mW)
THD+N (%)
40302010
0.01
0.1
1
10
100
0.001
050
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
R
L
= 32Ω
f
IN
= 1kHz
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)
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
VDD = 1.8V
R
L
= 16Ω
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
VDD = 3V
R
L
= 32Ω
10 100 1k 10k 100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc20
FREQUENCY (Hz)
VDD = 1.8V
R
L
= 32Ω
0
-100
-80
PSRR (dB)
-60
-40
-20
-30
-50
-70
-90
-10
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
VDD = 3V
R
L
= 16Ω
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, T
A
= +25°C, unless otherwise noted.)
POWER DISSIPATION
vs. OUTPUT POWER
MAX4411 toc30
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
16012040 80
50
100
150
200
250
300
350
400
0
0200
INPUTS 180°
OUT OF PHASE
fIN = 1kHz
R
L
= 16Ω
V
DD
= 3V
P
OUT
= P
OUTL + POUTR
INPUTS
IN PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4411 toc22
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
20
40
60
80
100
120
140
160
180
200
0
1.8 3.6
fIN = 1kHz
R
L
= 16Ω
THD+N = 1%
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4411 toc23
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
50
100
150
200
250
300
0
1.8 3.6
fIN = 1kHz
R
L
= 16Ω
THD+N = 10%
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4411 toc24
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
20
40
60
80
100
120
140
0
1.8 3.6
fIN = 1kHz
R
L
= 32Ω
THD+N = 1%
INPUTS 180°
OUT OF PHASE
INPUTS
IN PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4411 toc25
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
3.33.02.72.42.1
40
20
60
80
100
120
140
160
180
0
1.8 3.6
fIN = 1kHz
R
L
= 32Ω
THD+N = 10%
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
OUTPUT POWER vs. LOAD RESISTANCE
MAX4411 toc26
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100
40
20
60
80
100
120
140
160
0
10 100k
VDD = 3V
f
IN
= 1kHz
THD+N = 1%
INPUTS 180°
OUT OF PHASE
INPUTS
IN PHASE
OUTPUT POWER vs. LOAD RESISTANCE
MAX4411 toc27
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100
50
100
150
200
250
0
10 100k
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
VDD = 3V
f
IN
= 1kHz
THD+N = 10%
OUTPUT POWER vs. LOAD RESISTANCE
MAX4411 toc28
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100
5
10
15
20
25
30
35
40
45
0
10 100k
INPUTS 180°
OUT OF PHASE
INPUTS IN
PHASE
VDD = 1.8V
f
IN
= 1kHz
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
MAX4411 toc29
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100
10
20
30
40
50
60
70
0
10 100k
INPUTS 180°
OUT OF PHASE
INPUTS IN
PHASE
VDD = 1.8V
f
IN
= 1kHz
THD+N = 10%
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