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MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
General Description
The MAX4335–MAX4338 op amps deliver 40mW per
channel into 32Ω from ultra-small SC70/SOT23 packages
making them ideal for mono/stereo headphone drivers
in portable applications. These amplifiers have a 5MHz
gain-bandwidth product and are guaranteed to deliver
50mA of output current while operating from a single
supply of 2.7V to 5.5V.
The MAX4336 and the MAX4338 have a shutdown/mute
mode that reduces the supply current to 0.04μA per amplifier and places the outputs in a high-impedance state.
The MAX4335–MAX4338 have 90dB power-supply
rejection ratio (PSRR), eliminating the need for costly
pre-regulation in most audio applications. Both the input
voltage range and the output voltage swing include both
supply rails, maximizing dynamic range.
The MAX4335/MAX4336 single amplifiers are available
in ultra-small 6-pin SC70 packages. The MAX4337/
MAX4338 dual amplifiers are available in an 8-pin SOT23
and a 10-pin μMAX package, respectively. All devices are
specified from -40°C to +85°C.
Applications
●
●
●
●
●
●
32Ω Headphone Drivers
Portable/Battery-Powered Instruments
Wireless PA Control
Hands-Free Car Phones
Transformer/Line Drivers
DAC/ADC Buffers
Features
● 50mA Output Drive Capability
● Low 0.003% THD (20kHz into 10kΩ)
● Rail-to-Rail® Inputs and Outputs
● 2.7V to 5.5V Single-Supply Operation
● 5MHz Gain-Bandwidth Product
● 95dB Large-Signal Voltage Gain
● 90dB Power-Supply Rejection Ratio
● No Phase Reversal for Overdrive Inputs
● Ultra-Low Power Shutdown/Mute Mode
• Reduces Supply Current to 0.04μA
• Places Output in High-Impedance State
● Thermal Overload Protection
Ordering Information
PART
TEMP RANGE
PINPACKAGE
MAX4335EXT+T
-40°C to +85°C
6 SC70-6
AAX
MAX4336EXT+T
-40°C to +85°C
6 SC70-6
AAW
MAX4337EKA+T
-40°C to +85°C
8 SOT23-8
AAIK
MAX4337EUA+
-40°C to +85°C
8 μMAX
—
MAX4338EUB+
-40°C to +85°C
10 μMAX
—
Pin Configurations appear at end of data sheet.
Typical Operating Circuit
VCC
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.005
RL = 10kΩ,
VCC = 5V
VOUT = 2VP-P
R3
C1
MAX4335
MAX4336
R4
R1
R2
C2
THD + NOISE (%)
VIN
0.004
0.003
32Ω
C3
0.002
10
100
1k
FREQUENCY (Hz)
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
19-2136; Rev 2; 1/21
10k
100k
TOP
MARK
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
Absolute Maximum Ratings
Supply Voltage (VCC to GND)..................................-0.3V to +6V
All Other Pins to GND...................(GND - 0.3V) to (VCC + 0.3V)
Output Short-Circuit Duration to VCC or GND...........Continuous
Continuous Power Dissipation (TA = +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C)...........727mW
8-Pin μMAX (derate 4.5mW/°C above +70°C).............362mW
10-Pin μMAX (derate 5.6mW/°C above +70°C)...........444mW
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°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.
DC Electrical Characteristics
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = ∞ to VCC/2, VSHDN = VCC, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
Operating Supply Voltage Range
VCC
Quiescent Supply Current
(Per Amplifier)
ICC
Input Offset Voltage
Input Bias Current
Input Offset Current
CONDITIONS
Inferred from PSRR Test
MIN
TYP
2.7
MAX
UNITS
5.5
V
VCC = 5.5V
1.3
VCC = 2.7
1.2
VOS
VCM = GND to VCC
±0.6
±3
mV
IB
VCM = GND to VCC
±100
±400
nA
IOS
VCM = GND to VCC
±7
±30
nA
|VIN- - VIN+| < 1.2V
500
|VIN- - VIN+| > 1.2V
8.4
Differential Input Resistance
RIN(Diff)
Input Common-Mode Voltage
Range
VCM
Inferred from CMRR Test
GND
1.8
mA
kΩ
VCC
V
Common-Mode Rejection Ratio
CMRR
VCM = GND to VCC
60
80
dB
Power-Supply Rejection Ratio
PSRR
VCC = 2.7V to 5.5V
70
90
dB
Output Resistance
ROUT
AVCL = 1V/V
0.05
Ω
VCC = 5V: RL = 10kΩ
VOUT = 0.4V to 4.6V
Large-Signal Voltage Gain
Output Voltage Swing
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AVOL
VOUT
95
VCC = 5V: RL = 100Ω
VOUT = 0.5V to 4.5V
70
84
VCC = 2.7V: RL = 32Ω
VOUT = 0.5V to 2.2V
62
72
dB
VCC = 2.7V;
RL = 10kΩ
VCC - VOH
100
VOL
100
VCC = 2.7V;
RL = 32kΩ
VCC - VOH
220
400
VOL
280
400
VCC = 5V;
RL = 10kΩ
VCC - VOH
100
VOL
100
VCC = 5V;
RL = 100Ω
VCC - VOH
190
350
VOL
240
350
mV
Maxim Integrated │ 2
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
DC Electrical Characteristics (continued)
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = ∞ to VCC/2, VSHDN = VCC, TA = +25°C, unless otherwise noted.)
PARAMETER
Output Drive
Short-Circuit Current
SYMBOL
IOUT
CONDITIONS
MAX
VCC - VOH
270
500
VOL
360
500
VCC = 5V;
ISOURCE,
ISINK = 50mA
VCC - VOH
270
500
VOL
360
500
ISC
110
Normal mode
VIL
Shutdown mode
IIL
VCC = 5V, GND < VSHDN < VCC
Output Leakage Current in
Shutdown
IOUT(SHDN)
VCC = 5V, VSHDN = 0, VOUT = 0,
VCC
Shutdown Supply Current
(Per Amplifier)
ICC(SHDN)
SHDN = GND; VCC = 5V
SHDN Leakage Current
TYP
VCC = 2.7V;
ISOURCE,
ISINK = 50mA
VIH
SHDN Logic Levels
MIN
UNITS
mV
mA
0.7 x VCC
0.3 x VCC
V
0.5
μA
0.01
0.5
μA
√2
Therefore, PIC(DISS) = VRMS IRMS COS θ = 220mW
IPEAK
CC
MAX4335
MAX4336
√2
= 108mARMS
IRMS ≅ IDC +
VIN = 2VP-P
VPEAK
= 5.5V – 2.75V –
IPEAK
R
CIN
=
√2
1V
√2
= 2.043VRMS
0A
+
1V/32Ω
Therefore, PIC(DISS) = VRMS IRMS COS θ
= 45mW
The absolute maximum power-dissipation rating of the
package may be exceeded if the configuration in Figure
1 is used with the MAX4335/MAX4336 amplifiers at a
high ambient temperature of 79°C (220.6mW/°C plus a
derating of 3.1mW/°C x 9°C = 247.9mW). Note that the
247.9mW just exceeds the absolute maximum power
dissipation of 245mW for the 6-pin SC70 package.
√2
= 22mARMS
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Maxim Integrated │ 10
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
Single-Supply Speaker Driver
The MAX4335/MAX4336 can be used as a single-supply
speaker driver, as shown in the Typical Operating Circuit.
Capacitor C1 is used for blocking DC (a 0.1μF ceramic
capacitor can be used). When choosing resistors R3 and
R4, take into consideration the input bias current as well
as how much supply current can be tolerated. Choose
resistors R1 and R2 according to the amount of gain and
current desired. Capacitor C3 ensures unity gain for DC.
A 10μF electrolytic capacitor is suitable for most applications. The coupling capacitor C2 sets a low-frequency
pole and is fairly large in value. For a 32Ω load, a 100μF
coupling capacitor gives a low-frequency pole at 50Hz.
The low-frequency pole can be set according to the
following equation:
ƒ = 1 / 2π (RLC2)
MAX4335–MAX4338
R3
R3 = R1 R2
R1
R2
Figure 3. Reducing Offset Error Due to Bias Current
(Noninverting)
Rail-to-Rail Input Stage
Devices in the MAX4335–MAX4338 family of high-outputcurrent amplifiers have rail-to-rail input and output stages
designed for low-voltage, single-supply operation. The
input stage consists of separate NPN and PNP differential
stages that combine to provide an input common-mode
range that extends 0.25V beyond the supply rails. The
PNP stage is active for input voltages close to the negative rail, and the NPN stage is active for input voltages
near the positive rail. The switchover transition region,
which occurs near VCC/2, has been extended to minimize
the slight degradation in common-mode rejection ratio
caused by mismatch of the input pairs.
Since the input stage switches between the NPN and
PNP pairs, the input bias current changes polarity as the
input voltage passes through the transition region. Match
the effective impedance seen by each input to reduce the
offset error caused by input bias currents flowing through
external source impedances (Figures 3 and 5).
High source impedances, together with input capacitance,
can create a parasitic pole that produces an underdamped signal response. Reducing the input impedance
or placing a small (2pF to 10pF) capacitor across the
feedback resistor improves response.
The MAX4335–MAX4338’s inputs are protected from
large differential input voltages by 1kΩ series resistors and
back-to-back double diodes across the inputs (Figure 5).
For differential voltages less than 1.2V, input resistance
is typically 500kΩ. For differential input voltages greater
than 1.2V, input resistance is approximately 8.4kΩ. The
input bias current is given by the following equation:
MAX4335–MAX4338
R3
R3 = R1 R2
R1
R2
Figure 4. Reducing Offset Error Due to Bias Current (Inverting)
Rail-to-Rail Output Stage
The minimum output is within millivolts of ground for
single-supply operation, where the load is referenced to
ground (GND). Figure 6 shows the input voltage range
and the output voltage swing of a MAX4335 connected
as a voltage follower. The maximum output voltage swing
is load dependent; however, it is guaranteed to be within
400mV of the positive rail (VCC = 2.7V) even with maximum load (32Ω to VCC/2).
Driving Capacitive Loads
The MAX4335–MAX4338 have a high tolerance for
capacitive loads. They are stable with capacitive loads
up to 200pF. Figure 7 is a graph of the stable operating
region for various capacitive loads vs. resistive loads.
IBIAS = (VDIFF - 1.2V) / 8.4kΩ
www.maximintegrated.com
Maxim Integrated │ 11
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
4.2kΩ
4.2kΩ
Figure 5. Input Protection Circuit
Figures 8 and 9 show the transient response with excessive capacitive loads (330pF), with and without the
addition of an isolation resistor in series with the output.
Figure 10 shows a typical noninverting capacitive-loaddriving circuit in the unity-gain configuration. The resistor
improves the circuit’s phase margin by isolating the load
capacitor from the op amp’s output.
Power-Up and Shutdown/Mute Modes
The MAX4336/MAX4338 have a shutdown option. When
the shutdown pin (SHDN) is pulled low, supply current
drops to 0.04μA per amplifier (VCC = 5V), the amplifiers
are disabled, and their outputs are placed in a highimpedance state. Pulling SHDN high enables the amplifier. In the dual MAX4338, the two amplifiers shut down
independently. Figure 11 shows the MAX4336’s output
voltage response to a shutdown pulse. The MAX4335–
MAX4338 typically settle within 5μs after power-up
(Figure 12).
Power Supplies and Layout
The MAX4335–MAX4338 can operate from a single 2.7V
to 5.5V supply. Bypass the power supply with a 0.1μF
ceramic capacitor in parallel with at least 1μF. Good
layout improves performance by decreasing the amount
of stray capacitance at the op amps’ inputs and outputs.
Decrease stray capacitance by placing external components close to the op amps’ input/output pins, minimizing
trace and lead lengths.
www.maximintegrated.com
Thermal Overload Protection
The MAX4335–MAX4338 includes thermal overload
protection circuitry. When the junction temperature of
the device exceeds +140°C, the supply current drops
to 120μA per amplifier (VCC = 5V) and the outputs are
placed in a high-impedance state. The device returns to
normal operation when the junction temperature falls to
below +120°C.
Short-Circuit Current Protection
The MAX4335–MAX4338 incorporate a smart shortcircuit protection feature. Figure 7 shows the output
voltage region where the protection circuitry is active. A
fault condition occurs when IOUT > 110mA and VOUT >
1V (sinking current) or when IOUT > 110mA and (VCC VOUT) > 1V (sourcing current). When a fault is detected,
the short-circuit protection circuitry is activated and the
output current is limited to 110mA, protecting the device
and the application circuitry. When the smart short circuit
is not active, the output current can safely exceed 110mA
(see the Output Current vs. Output Voltage Graph in the
Typical Operating Characteristics).
Maxim Integrated │ 12
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
VOUT
VCC
IN
(1V/div)
VCC - 1V
IN SOURCE MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT
ACTIVATED FOR (VCC - VOUT) < 1V. OUTPUT CURRENT CAN SAFELY
EXCEED 110mA.
SHORT-CIRCUIT PROTECTION CIRCUITRY
LIMITS OUTPUT CURRENT TO 110mA
OUT
(1V/div)
1V
IN SINK MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT
ACTIVATED FOR VOUT < 1V. OUTPUT CURRENT CAN SAFELY
EXCEED 110mA.
0
MAX4335-fig07
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
Figure 7. Short-Circuit Protection
VCC = 5.0V
RL to VCC/2
IN
(20mV/div)
UNSTABLE REGION
OUT
(20mV/div)
STABLE REGION
10
100
1k
10k
RESISTIVE LOAD (Ω)
Figure 8. Capacitive-Load Stability
www.maximintegrated.com
VCC = 3.0V, CL = 330pF
RL = 100kΩ, RISO = 0
MAX4335-fig08
CAPACITIVE LOAD (pF)
Figure 6. Rail-to-Rail Input/Output Range
100k
1µs/div
Figure 9. Small-Signal Transient Response with Excessive
Capacitive Load
Maxim Integrated │ 13
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
VCC = 3.0V, CL = 330pF
RL = 100kΩ, RISO = 39Ω
IN
(20mV/div)
RISO
MAX4336
CL
OUT
(20mV/div)
1µs/div
Figure 11. Capacitive-Load-Driving Circuit
MAX4335-fig12
MAX4335-fig11
Figure 10. Small-Signal Transient Response with Excessive
Capacitive Load with Isolation Resistor
VCC
1V/div
SHDN
1V/div
OUT
1V/div
OUT
2V/div
5µs/div
Figure 12. Shutdown Output Voltage Enable/Disable
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5µs/div
Figure 13. Power-Up/Down Output Voltage
Maxim Integrated │ 14
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
Pin Configurations
TOP VIEW
+
IN
1
GND 2
-
IN
6
MAX4335
MAX4336
3
OUT1 1
IN1- 2
5
4
SC70
VCC
SHDN (N.C.)
OUT
IN1+ 3
MAX4337
GND 4
8
VCC
7
OUT2
6
IN2-
5
IN2+
10 VCC
OUT1 1
2
9
OUT2
8
IN2-
GND 4
7
IN2+
SHDN1 5
6
SHDN2
IN1-
MAX4338
IN1+ 3
µMAX
SOT23/µMAX
( ) MAX4335 ONLY
Chip Information
MAX4335 TRANSISTOR COUNT: 1200
MAX4336 TRANSISTOR COUNT: 1200
MAX4337 TRANSISTOR COUNT: 2400
MAX4338 TRANSISTOR COUNT: 2400
PROCESS: BiCMOS
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Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character,
but the drawing pertains to the package regardless of RoHS
status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
6 SC-70
X6SN+1
21-0077
90-0189
8 SOT23
K8+5
21-0078
90-0179
8 μMAX
U8+1
21-0036
90-0092
10 μMAX
U10+2
21-0061
90-0330
Maxim Integrated │ 15
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
Revision History
REVISION
NUMBER
REVISION
DATE
2
1/21
DESCRIPTION
Updated Ordering Information and Package Information
PAGES
CHANGED
1, 15
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2021 Maxim Integrated Products, Inc. │ 16
