MAX4411EBE+T-MAX4411EBE-T-MAX4411ETP-MAX4411ETP+-MAX4411ETP+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX4411EBE-T ,80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with ShutdownFeaturesThe MAX4411 fixed-gain, stereo headphone amplifier is ♦ No Bulky DC-Blocking Capacitors Req ..
MAX4411ETP ,80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with ShutdownMAX441119-2618; Rev 2; 9/0680mW, Fixed-Gain, DirectDrive, StereoHeadphone Amplifier with Shutdown
MAX4411ETP ,80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdownapplications. ♦ Short-Circuit and Thermal-Overload ProtectionThe MAX4411 operates from a single 1.8 ..
MAX4411ETP+ ,80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with ShutdownELECTRICAL CHARACTERISTICS(PV = SV = 3V, PGND = SGND = 0V, SHDNL = SHDNR = SV , C1 = C2 = 2.2µF, C ..
MAX4411ETP+T ,80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with ShutdownFeaturesThe MAX4411 fixed-gain, stereo headphone amplifier is ♦ No Bulky DC-Blocking Capacitors Req ..
MAX4411ETP+T ,80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with ShutdownApplicationsMAX4411EBE-T -40°C to +85°C 16 UCSP-16 -1.5Notebook PCs MP3 PlayersMAX4411EBE+T -40°C t ..
MAX823TEUK-T ,5-Pin Microprocessor Supervisory Circuits with Watchdog Timer and Manual ResetApplications MAX823_EXK-T-40°C to +85°CMAX823_EUK-T 5 SOT23-5-40°C to +125°CComputers and Controlle ..
MAX823TEXK+T ,5-Pin Microprocessor Supervisory Circuits with Watchdog Timer and Manual ResetApplications MAX823_EXK-T-40°C to +85°CMAX823_EUK-T 5 SOT23-5-40°C to +125°CComputers and Controlle ..
MAX824L ,5-Pin Microprocessor Supervisory Circuits with Watchdog Timer and Manual ResetApplications MAX823_EXK-T-40°C to +85°CMAX823_EUK-T 5 SOT23-5-40°C to +125°CComputers and Controlle ..
MAX824LEUK+T ,5-Pin Microprocessor Supervisory Circuits with Watchdog Timer and Manual ResetMAX823/MAX824/MAX82519-0487; Rev 5; 12/055-Pin Microprocessor Supervisory Circuits WithWatchdog Tim ..
MAX824LEXK+T ,5-Pin Microprocessor Supervisory Circuits with Watchdog Timer and Manual ResetApplications MAX823_EXK-T-40°C to +85°CMAX823_EUK-T 5 SOT23-5-40°C to +125°CComputers and Controlle ..
MAX824MEUK ,Microprocessor supervisory circuit. Reset threshold 4.38V. Active-low reset. Active-high reset. Watchdog input.General Description ________

MAX4411EBE+T-MAX4411EBE-T-MAX4411ETP-MAX4411ETP+-MAX4411ETP+T
80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown
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 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
16Ωload 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 -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
FeaturesNo Bulky DC-Blocking Capacitors RequiredFixed -1.5V/V Gain Eliminates External Feedback
Network
MAX4411: -1.5V/V
MAX4411B: -2V/VGround-Referenced Outputs Eliminate DC-Bias
Voltages on Headphone Ground PinNo Degradation of Low-Frequency Response Due
to Output Capacitors80mW per Channel into 16ΩLow 0.003% THD+NHigh PSRR (86dB at 217Hz)Integrated Click-and-Pop Suppression1.8V to 3.6V Single-Supply OperationLow Quiescent Current (5mA)Independent Left/Right, Low-Power
Shutdown ControlsShort-Circuit and Thermal-Overload Protection±8kV ESD-Protected Amplifier OutputsAvailable 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
LEFT
AUDIO
INPUT
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
FIXED GAIN ELIMINATES
EXTERNAL RESISTOR
NETWORK
RIGHT
AUDIO
INPUT
SHDNL
SHDNRMAX4411
Functional Diagram
Ordering Information
19-2618; Rev 2; 9/06
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN/BUMP-
PACKAGE
GAIN
(V/V)
MAX4411EBE-T-40°C to +85°C16 UCSP-16-1.5
MAX4411EBE+T-40°C to +85°C16 UCSP-16-1.5
MAX4411ETP-40°C to +85°C20 Thin QFN-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.
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(PVDD= SVDD= 3V, PGND = SGND = 0V, SHDNL= SHDNR= SVDD, C1 = C2 = 2.2µF, CIN= 1µF, RL= ∞, TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +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
PVDDto SVDD.................................................................-0.3V to +0.3V
PVSSto SVSS.........................................................-0.3V to +0.3V
PVDDand SVDDto PGND or SGND.........................-0.3V to +4V
PVSSand SVSSto PGND or SGND..........................-4V to +0.3V
IN_ to SGND................................(SVSS- 0.3V) to (SVDD+ 0.3V)
SHDN_to SGND........................(SGND - 0.3V) to (SVDD+ 0.3V)
OUT_ to SGND.............................(SVSS- 0.3V) to (SVDD+0.3V)
C1P to PGND.............................(PGND - 0.3V) to (PVDD+ 0.3V)
C1N to PGND.............................(PVSS- 0.3V) to (PGND + 0.3V)
Output Short Circuit to GND or VDD...........................Continuous
Continuous Power Dissipation (TA= +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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply Voltage RangeVDDGuaranteed by PSRR test1.83.6V
One channel enabled3.2Quiescent Supply CurrentIDDTwo channels enabled58.4mA
Shutdown Supply CurrentI SHDNSHDNL = SHDNR = GND610µA
VIH0.7 x
SVDD
SHDN_ Thresholds
VIL0.3 x
SVDD
SHDN_ Input Leakage Current-1+1µA
SHDN_ to Full OperationtSON175µs
CHARGE PUMP
Oscillator FrequencyfOSC272320368kHz
AMPLIFIERS
MAX4411-1.55-1.5-1.45Voltage GainAVMAX4411B-2.1-2-1.9V/V
Gain MatchΔAV1%
MAX44110.72.8Total Output Offset VoltageVOSInput AC-coupledMAX4411B0.753.0mV
Input ResistanceRIN101419kΩ
1.8V ≤ VDD ≤ 3.6V,
MAX4411DC (Note 2)7286
fRIPPLE = 217Hz86
fRIPPLE = 1kHz75
Power-Supply Rejection RatioPSRRVDD = 3.0V, 200mVP-P
ripple, MAX4411
(Note 3)fRIPPLE = 20kHz53
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(PVDD= SVDD= 3V, PGND = SGND = 0V, SHDNL= SHDNR= SVDD, C1 = C2 = 2.2µF, CIN= 1µF, RL= ∞, TA= TMINto TMAX,
unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 1:All specifications are 100% tested at TA= +25°C; temperature limits are guaranteed by design.
Note 2:Inputs are connected directly to GND.
Note 3:Inputs are AC-coupled to ground.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
1.8V ≤ VDD ≤ 3.6V,
MAX4411BDC (Note 2)6986
fRIPPLE = 217Hz86
fRIPPLE = 1kHz73
Power-Supply Rejection RatioPSRRVDD = 3.0V, 200mVP-P
ripple, MAX4411B
(Note 3)fRIPPLE = 20kHz51
RL = 32Ω65Output PowerPOUTTHD+N ≤ 1%
TA = +25°CRL = 16Ω5580mW
RL = 32Ω, POUT =
50mW0.003
Total Harmonic Distortion Plus
NoiseTHD+NfIN = 1kHz
RL = 16Ω, POUT =
60mW0.004
MAX441194
Signal-to-Noise RatioSNR
RL = 32Ω, POUT =
20mW, fIN = 1kHz,
BW = 22Hz to 22kHzMAX4411B95
Slew RateSR0.8V/µs
Maximum Capacitive LoadCLNo sustained oscillations150pF
CrosstalkRL = 16Ω, POUT = 1.6mW, fIN = 10kHz90dB
Thermal Shutdown Threshold140°C
Thermal Shutdown Hysteresis15°C
ESD ProtectionHuman Body Model (OUTR, OUTL)±8kV
Typical Operating Characteristics
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc01
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
VDD = 3V
RL = 16Ω
POUT = 10mW
POUT = 25mW
POUT = 50mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc02
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
POUT = 5mW
POUT = 10mW
POUT = 25mW
VDD = 3V
RL = 32Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc03
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
POUT = 5mW
POUT = 10mW
POUT = 20mW
VDD = 1.8V
RL = 16Ω
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4411 toc04
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.001100k
POUT = 5mW
POUT = 10mW
POUT = 20mW
VDD = 1.8V
RL = 32Ω
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc05
OUTPUT POWER (mW)
THD+N (%)
VDD = 3V
RL = 16Ω
fIN = 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 (%)
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
RL = 16Ω
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc07
OUTPUT POWER (mW)
THD+N (%)
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
RL = 16Ω
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc08
OUTPUT POWER (mW)
THD+N (%)
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
RL = 32Ω
fIN = 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc09
OUTPUT POWER (mW)
THD+N (%)
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
RL = 32Ω
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc10
OUTPUT POWER (mW)
THD+N (%)
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 3V
RL = 32Ω
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc11
OUTPUT POWER (mW)
THD+N (%)40302010
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
RL = 16Ω
fIN = 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc12
OUTPUT POWER (mW)
THD+N (%)40302010
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
RL = 16Ω
fIN = 1kHz
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc16
OUTPUT POWER (mW)
THD+N (%)302010
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
RL = 32Ω
fIN = 10kHz
CROSSTALK vs. FREQUENCY
MAX4411 toc21
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-140100k
VDD = 3V
POUT = 1.6mW
RL = 16Ω
LEFT TO RIGHT
RIGHT TO LEFT
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc13
OUTPUT POWER (mW)
THD+N (%)40302010
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
RL = 16Ω
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc14
OUTPUT POWER (mW)
THD+N (%)302010
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
RL = 32Ω
fIN = 20Hz
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX4411 toc15
OUTPUT POWER (mW)
THD+N (%)302010
OUTPUTS IN
PHASE
OUTPUTS 180°
OUT OF PHASE
ONE CHANNEL
DRIVEN
VDD = 1.8V
RL = 32Ω
fIN = 1kHz
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
-1001001k10k100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc18
FREQUENCY (Hz)
PSRR (dB)-60
-10VDD = 1.8V
RL = 16Ω
-1001001k10k100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc19
FREQUENCY (Hz)
PSRR (dB)-60
-10VDD = 3V
RL = 32Ω1001k10k100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc20
FREQUENCY (Hz)
VDD = 1.8V
RL = 32Ω
PSRR (dB)-60
-1001001k10k100k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4411 toc17
FREQUENCY (Hz)
PSRR (dB)-60
-10VDD = 3V
RL = 16Ω
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
POWER DISSIPATION
vs. OUTPUT POWER
MAX4411 toc30
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
INPUTS 180°
OUT OF PHASE
fIN = 1kHz
RL = 16Ω
VDD = 3V
POUT = POUTL + POUTR
INPUTS
IN PHASE
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4411 toc22
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
fIN = 1kHz
RL = 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)
fIN = 1kHz
RL = 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)
fIN = 1kHz
RL = 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)
fIN = 1kHz
RL = 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
160100k
VDD = 3V
fIN = 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
250100k
INPUTS
IN PHASE
INPUTS 180°
OUT OF PHASE
VDD = 3V
fIN = 1kHz
THD+N = 10%
OUTPUT POWER vs. LOAD RESISTANCE
MAX4411 toc28
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100100k
INPUTS 180°
OUT OF PHASE
INPUTS IN
PHASE
VDD = 1.8V
fIN = 1kHz
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
MAX4411 toc29
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
10k1k100100k
INPUTS 180°
OUT OF PHASE
INPUTS IN
PHASE
VDD = 1.8V
fIN = 1kHz
THD+N = 10%
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
GAIN FLATNESS vs. FREQUENCY
MAX4411 toc34
FREQUENCY (Hz)
GAIN (dB)
100k10k1k100
-301M
VDD = 3V
RL = 16Ω
AV = -1.5V/VAV = -2V/V
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4411 toc38
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
POWER DISSIPATION
vs. OUTPUT POWER
MAX4411 toc31
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
INPUTS 180°
OUT OF PHASE
fIN = 1kHz
RL = 32Ω
VDD = 3V
POUT = POUTL + POUTR
INPUTS
IN PHASE
POWER DISSIPATION
vs. OUTPUT POWER
MAX4411 toc32
OUTPUT POWER (mW)
POWER DISSIPATION (mW)40301020
INPUTS 180°
OUT OF PHASE
fIN = 1kHz
RL = 16Ω
VDD = 1.8V
POUT = POUTL + POUTR
INPUTS
IN PHASE
POWER DISSIPATION
vs. OUTPUT POWER
MAX4411 toc33
OUTPUT POWER (mW)
POWER DISSIPATION (mW)40301020
INPUTS 180°
OUT OF PHASE
fIN = 1kHz
RL = 32Ω
VDD = 1.8V
POUT = POUTL + POUTR
INPUTS
IN PHASE
CHARGE-PUMP OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE
MAX4411 toc35
SUPPLY VOLTAGE (V)
OUTPUT RESISTANCE (
VIN_ = GND
IPVSS = 10mA
NO LOAD
OUTPUT POWER vs. CHARGE-PUMP
CAPACITANCE AND LOAD RESISTANCE
MAX4411 toc36
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)302050
fIN = 1kHz
THD+N = 1%
INPUTS IN PHASE
C1 = C2 = 1μF
C1 = C2 = 0.47μF
C1 = C2 = 0.68μF
C1 = C2 = 2.2μF
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4411 toc39
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SHDNL = SHDNR = GND
FREQUENCY (kHz)10.1100
OUTPUT SPECTRUM vs. FREQUENCY
MAX4411 toc37
OUTPUT SPECTRUM (dB)
VOUT = 1VP-P
fIN = 1kHz
RL = 32Ω
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
Pin Description
PINBUMP
QFNUCSPNAMEFUNCTIONA4C1PFlying Capacitor Positive TerminalB4PGNDPower Ground. Connect to ground (0V).C4C1NFlying Capacitor Negative Terminal
4, 6, 8, 12,
16, 20—N.C.No Connection. Not internally connected.
5D4PVSSCharge-Pump Output
7D3SVSSAmplifier Negative Power Supply. Connect to PVSS.D2OUTLLeft-Channel OutputD1SVDDAmplifier Positive Power Supply. Connect to positive supply (1.8V to 3.6V).C2OUTRRight-Channel OutputC1INLLeft-Channel Audio InputB1SHDNRActive-Low Right-Channel Shutdown. Connect to VDD for normal operation.A1INRRight-Channel Audio InputA2SGNDSignal Ground. Connect to ground (0V).B2SHDNLActive-Low Left-Channel Shutdown. Connect to VDD for normal operation.A3PVDDCharge-Pump Power Supply. Powers charge-pump inverter, charge-pump logic, and
oscillator. Connect to positive supply (1.8V to 3.6V).EPExposed Paddle. Leave unconnected. Do not connect to any voltage including
GND or VDD.
POWER-UP/DOWN WAVEFORM
MAX4411 toc41
OUT_
OUT_FFT
VDD
20dB/div
10mV/div
200ms/div
FFT: 25Hz/div
-100dB
RL = 32Ω
VIN_ = GND
Typical Operating Characteristics (continued)
(C1 = C2 = 2.2µF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
EXITING SHUTDOWN
MAX4411 toc40
OUTR
SHDNR
2V/div
500mV/div
200μs/divfIN = 1kHz
RL = 32Ω
SHDNL = GND
MAX4411
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
Detailed Description
The MAX4411 fixed-gain, stereo headphone driver fea-
tures Maxim’s DirectDrive architecture, eliminating the
large output-coupling capacitors required by conven-
tional single-supply headphone drivers. The device con-
sists of two 80mW Class AB headphone drivers, internal
feedback network, undervoltage lockout (UVLO)/shut-
down control, charge pump, and comprehensive click-
and-pop suppression circuitry (see Typical Application
Circuit). The charge pump inverts the positive supply
(PVDD), creating a negative supply (PVSS). The head-
phone drivers operate from these bipolar supplies with
their outputs biased about GND (Figure 1). The drivers
have almost twice the supply range compared to other
3V single-supply drivers, increasing the available output
power. The benefit of this GND bias is that the driver out-
puts do not have a DC component typically VDD/2. The
large DC-blocking capacitors required with convention-
al headphone drivers are unnecessary, thus conserving
board space, system cost, and improving frequency
response.
Each channel has independent left/right, active-low
shutdown controls, optimizing power savings in mixed-
mode, mono/stereo operation. The device features an
undervoltage lockout that prevents operation from an
insufficient power supply and click-and-pop suppres-
sion that eliminates audible transients on startup and
shutdown. Additionally, the MAX4411 features thermal-
overload and short-circuit protection and can withstand
±8kV ESD strikes on the output pins.
Fixed Gain
The MAX4411 utilizes an internally fixed gain configura-
tion of either -1.5V/V (MAX4411) or -2V/V (MAX4411B).
All gain-setting resistors are integrated into the device,
reducing external component count. The internally set
gain, in combination with DirectDrive, results in a head-
phone amplifier that requires only five tiny 1µF capaci-
tors to complete the amplifier circuit: two for the charge
pump, two for audio input coupling, and one for power-
supply bypassing (see Typical Application Circuit).
DirectDrive
Conventional single-supply headphone drivers have their
outputs biased about a nominal DC voltage (typically half
the supply) for maximum dynamic range. Large coupling
capacitors are needed to block this DC bias from the
headphone. Without these capacitors, a significant
amount of DC current flows to the headphone, resulting
in unnecessary power dissipation and possible damage
to both headphone and headphone driver.
Maxim’s DirectDrive architecture uses a charge pump
to create an internal negative supply voltage.
This allows the MAX4411 outputs to be biased about
GND, almost doubling dynamic range while operating
from a single supply. With no DC component, there is
no need for the large DC-blocking capacitors. Instead
of two large (220µF, typ) tantalum capacitors, the
MAX4411 charge pump requires two small ceramic
capacitors, conserving board space, reducing cost,
and improving the frequency response of the head-
phone driver. See the Output Power vs. Charge-Pump
Capacitance and Load Resistance graph in the Typical
Operating Characteristicsfor details of the possible
capacitor sizes. There is a low DC voltage on the driver
outputs due to amplifier offset. However, the offset of
the MAX4411 is typically 0.7mV, which, when com-
bined with a 32Ωload, results in less than 23µA of DC
current flow to the headphones.
Previous attempts to eliminate the output-coupling capac-
itors involved biasing the headphone return (sleeve) to
the DC-bias voltage of the headphone amplifiers. This
+VDD
-VDD
GNDVOUT
CONVENTIONAL DRIVER-BIASING SCHEME
DirectDrive BIASING SCHEME
VDD/2
VDD
GND
VOUT
Figure 1. Conventional Driver Output Waveform vs. MAX4411
Output Waveform

Partno	Mfg	Dc	Qty	Available	Descript
MAX4411EBE+T	MAXIM	N/a	25000	avai	80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown
MAX4411EBE-T \|MAX4411EBET	MAXIM	N/a	54000	avai	80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown
MAX4411ETP	MAX	N/a	70	avai	80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown
MAX4411ETP	MAXIM	N/a	6651	avai	80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown
MAX4411ETP+ \|MAX4411ETP	MAXIM	N/a	1920	avai	80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown
MAX4411ETP+T	MAXIM	N/a	3560	avai	80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown
MAX4411ETP+T \|MAX4411ETPT	MAX	N/a	2438	avai	80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown