General Description
The MAX4335–MAX4338 op amps deliver 40mW per
channel into 32Ωfrom ultra-small SC70/SOT23 pack-
ages 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
32ΩHeadphone 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
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
________________________________________________________________ Maxim Integrated Products 1
19-2136; Rev 1; 9/01
Ordering Information
Pin Configurations appear at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
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-
PACKAGE
TOP
MARK
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 —
Typical Operating Circuit
VCC
R2
C2
C1
VIN
32Ω
R4
R1
C3
R3
MAX4335
MAX4336
10 100 10k1k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
FREQUENCY (Hz)
THD + NOISE (%)
0.005
0.004
0.002
0.003
RL = 10kΩ,
VCC = 5V
VOUT = 2VP-P
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
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
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 CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage Range VCC Inferred from PSRR Test 2.7 5.5 V
VCC = 5.5V 1.3 1.8
Quiescent Supply Current (Per
Amplifier) ICC VCC = 2.7 1.2 mA
Input Offset Voltage VOS VCM = GND to VCC ±0.6 ±3 mV
Input Bias Current IBVCM = GND to VCC ±100 ±400 nA
Input Offset Current IOS VCM = GND to VCC ±7 ±30 nA
|VIN- - VIN+| < 1.2V 500
Differential Input Resistance RIN(Diff) |VIN- - VIN+| > 1.2V 8.4 kΩ
Input Common-Mode Voltage
Range VCM Inferred from CMRR Test GND 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 95
VCC = 5V: RL = 100Ω
VOUT = 0.5V to 4.5V 70 84
Large-Signal Voltage Gain AVOL
VCC = 2.7V: RL = 32Ω
VOUT = 0.5V to 2.2V 62 72
dB
VCC - VOH 100
VCC = 2.7V;
RL = 10kΩVOL 100
VCC - VOH 220 400
VCC = 2.7V;
RL = 32ΩVOL 280 400
VCC - VOH 100
VCC = 5V;
RL = 10kΩVOL 100
VCC - VOH 190 350
Output Voltage Swing VOUT
VCC = 5V;
RL = 100ΩVOL 240 350
mV
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
_______________________________________________________________________________________ 3
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.)
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL= ∞to VCC/2, VSHDN = VCC, TA= -40°C to +85°C, unless otherwise noted.)
(Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VCC - VOH 270 500
VCC = 2.7V;
ISOURCE,
ISINK = 50mA VOL 360 500
VCC - VOH 270 500
Output Drive IOUT
VCC = 5V;
ISOURCE,
ISINK = 50mA VOL 360 500
mV
Short-Circuit Current ISC 110 mA
VIH Normal mode 0.7 x VCC
SHDN Logic Levels VIL Shutdown mode 0.3 x VCC
V
SHDN Leakage Current IIL VCC = 5V, GND < VSHDN < VCC 0.5 µA
Output Leakage Current in
Shutdown IOUT
(
SHDN
)
VCC = 5V, VSHDN = 0, VOUT = 0,
VCC 0.01 0.5 µA
Shutdown Supply Current
(Per Amplifier) ICC
(
SHDN
)
SHDN = GND; VCC = 5V <0.04 0.5 µA
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage Range VCC Inferred from PSRR test 2.7 5.5 V
Quiescent Supply Current (Per
Amplifier) ICC VCC = 5.5V 2.25 mA
Input Offset Voltage VOS VCM = GND to VCC ±6 mV
Input Bias Current IBVCM = GND to VCC ±600 nA
Input Offset Current IOS VCM = GND to VCC ±60 nA
Input Common-Mode Voltage
Range VCM Inferred from CMRR test GND VCC V
Common-Mode Rejection Ratio CMRR VCM = GND to VCC 50 dB
Power-Supply Rejection Ratio PSRR VCC = 2.7V to 5.5V 64 dB
VCC = 5V: RL = 100Ω,
VOUT = 0.6V to 4.4V 66
Large-Signal Voltage Gain AVOL VCC = 2.7V: RL = 32Ω,
VOUT = 0.6V to 2.1V 56
dB
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
4 _______________________________________________________________________________________
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = ∞to VCC/2, VSHDN = VCC, TA= -40°C to +85°C, unless otherwise noted.)
(Note 1)
AC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V, GND = 0, VCM = VCC/2, VOUT = VCC/2, VSHDN = VCC, AVCL = 1V/V, CL= 15pF, RL = ∞to VCC/2,TA= +25°C, unless
otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Gain-Bandwidth Product GBWP 5 MHz
Full-Power Bandwidth FBWP VOUT = 2VP-P, VCC = 5V 280 kHz
Slew Rate SR 1.8 V/µs
Phase Margin PM 70 degrees
Gain Margin GM 18 dB
f = 1kHz 0.005
VCC = 5V, RL = 100Ω,
VOUT = 2VP-P f = 10kHz 0.02
VCC = 5V, RL = 10kΩ, VOUT = 2VP-P,
f = 10kHz 0.003
f = 1kHz 0.01
Total Harmonic Distortion THD
VCC = 2.7V;
RL = 32Ω,
VOUT = 2VP-P f = 10kHz 0.03
%
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VCC - VOH 500
VCC = 2.7V;
RL = 32ΩVOL 500
VCC - VOH 400
Output Voltage Swing VOUT VCC = 5V;
RL = 100ΩVOL 400
mV
VCC - VOH 650
VCC = 2.7V;
ISOURCE,
ISINK = 50mA VOL 650
VCC - VOH 650
Output Drive IOUT
VCC = 5V;
ISOURCE,
ISINK = 50mA VOL 650
mV
VIH Normal mode 0.7 x VCC
SHDN Logic Level VIL Shutdown mode 0.3 x VCC
V
SHDN Leakage Current IIL VCC = 5V, GND < VSHDN < VCC 1µA
Output Leakage Current in
Shutdown IOUT
(
SHDN
)
VCC = 5V, VSHDN = 0, VOUT = 0;
VCC 1µA
Shutdown Supply Current
(Per Amplifier) ICC
(
SHDN
)
VSHDN = 0; VCC = 5V 1 µA
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
_______________________________________________________________________________________ 5
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.7V, GND = 0, VCM = VCC/2, VOUT = VCC/2, VS HDN = VCC, AVCL = 1V/V, CL= 15pF, RL = ∞to VCC/2, TA= +25°C, unless
otherwise noted.)
Note 1: All devices are 100% production tested at TA= +25°C. All limits over temperature are guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Settling Time to 0.01% tS2V step 2 µs
Crosstalk CT VOUT = 2VP-P; f = 1kHz 100 dB
Input Capacitance CIN 5pF
f = 10kHz 26
Input Voltage-Noise Density enf = 1kHz nV/√Hz
f = 10kHz 0.6
Input Current-Noise Density Inf = 1kHz pA/√Hz
Capacitive-Load Stability No sustained oscillation 200 pF
Shutdown Time tSHDN 1µs
Enable Time from Shutdown tENABLE 1µs
Power-Up Time tON 5µs
__________________________________________Typical Operating Characteristics
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = ∞to VCC/2, VS HDN = VCC, TA= +25°C, unless otherwise noted.)
1.4
1.3
1.2
1.1
1.0
-40 10-15 35 60 85
MAX4335-8 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
VCC = 5.5V
VCC = 2.7V
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
-40 -15 10 35 60 85
MAX4335-8 toc02
TEMPERATURE (°C)
MINIMUM OPERATING VOLTAGE (V)
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE
0
300
200
100
400
500
600
700
800
900
1000
MAX4335-8 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (pA)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
-40 -15 10 35 60 85
VCC = 5.5V
VCC = 2.7V
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
6 _______________________________________________________________________________________
-200
-100
-150
0
-50
50
100
0231 456
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX4335 toc05
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (nA)
VCC = 2.7V VCC = 5.5V
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
MAX4335
-
8 toc04
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE (mV)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
-40 -15 10 35 60 85
SC70
µMAX
-250
-150
-200
0
-50
-100
150
100
50
200
MAX4335-8 toc06
TEMPERATURE (°C)
-40 -15 10 35 60 85
INPUT BIAS CURRENT (nA)
INPUT BIAS CURRENT
vs. TEMPERATURE
VCM = VCC
VCC = 5.5V
VCM = 0
VCC = 2.7V
VCM = VCC
VCC = 2.7V
VCM = 0
VCC = 5.5V
80
81
83
82
84
85
MAX4335-8 toc07
TEMPERATURE (°C)
-40 -15 10 35 60 85
CMRR (dB)
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
0
50
150
100
200
250
0 1.6
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SINKING)
MAX4335 toc10
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
0.80.4 1.2
VCC = 5.5V
VCC = 2.7V
0
100
50
200
150
300
250
350
MAX4335-8 toc09
OUTPUT HIGH VOLTAGE (mV)
OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
TEMPERATURE (°C)
-40 -15 10 35 60 85
VCC = 5.5V
RL = 100ΩVCC = 2.7V
RL = 100Ω
VCC = 2.7V
RL = 100Ω
VCC = 5.5V
RL = 100Ω
80
120
160
200
240
280
320
360
400
440
480
MAX4335-8 toc08
OUTPUT LOW VOLTAGE (mV)
TEMPERATURE (°C)
-40 -15 10 35 60 85
OUTPUT LOW VOLTAGE
vs. TEMPERATURE
VCC = 5.5V
RL = 100Ω
VCC = 2.7V
RL = 100Ω
VCC = 2.7V
RL = 100Ω
VCC = 5.5V
RL = 100Ω
0
50
150
100
200
250
MAX4335 toc11
OUTPUT VOLTAGE
(
V
)
OUTPUT CURRENT (mA)
0 1.6
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SOURCING)
0.4 0.60.2 0.8 1.0 1.2 1.4
VCC = 5.5V
VCC = 2.7V
55
75
65
95
85
115
105
0 0.20.1 0.3 0.4 0.5
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
(SINKING, VCC = 5.5V)
MAX4335 toc12
OUTPUT VOLTAGE (V)
LARGE-SIGNAL GAIN (dB)
RL REFERENCED TO VCC
RL = 100kΩ
RL = 1kΩ
RL = 100Ω
Typical Operating Characteristics (continued)
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = ∞to VCC/2, VS HDN = VCC, TA= +25°C, unless otherwise noted.)
MAX4335-8 toc19
FREQUENCY (Hz)
PSRR (dB)
100 1k 10k 100k 1M 10M
-110
-90
-70
-30
-50
-10
10
-100
-80
-60
-20
-40
0
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
100
0.01
1k 10k 1M 10M
OUTPUT IMPEDANCE
vs. FREQUENCY
0.1
1
10
MAX4335-8 toc20
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
100k
AV = 1
0.040
0.035
0.030
0.025
0.020
0.015
0.010
0.005
0
10 1k 10k100 100k
TOTAL HARMONIC DISTORTION AND
NOISE vs. FREQUENCY
MAX4335/8 toc21
FREQUENCY (Hz)
THD + NOISE (%)
VCC = 5V
VOUT = 2VP-P
500kHz LOWPASS FILTER
RL = 10kΩ to VCC/2
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
_______________________________________________________________________________________ 7
50
70
60
90
80
110
100
120
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
(SOURCING, VCC = 5.5V)
MAX4335 toc13
OUTPUT VOLTAGE (V)
LARGE-SIGNAL GAIN (dB)
0.1 0.2 0.3 0.4 0.5
RL REFERENCED TO VCC/2
RL = 100kΩ
RL = 1kΩ
RL = 100Ω
35
55
65
75
85
95
105
115
0.1 0.2 0.3 0.4 0.5
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
(SINKING, VCC = 2.7V)
MAX4335 toc14
OUTPUT VOLTAGE (V)
LARGE-SIGNAL GAIN (dB)
45
RL REFERENCED TO VCC
RL = 100kΩ
RL = 1kΩ
RL = 100Ω
40
50
70
60
90
100
80
110
0.05 0.25 0.350.15 0.45 0.55 0.65 0.75
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
(SOURCING, VCC = 2.7V)
MAX4335 toc15
OUTPUT VOLTAGE (V)
LARGE-SIGNAL GAIN (dB)
RL = 100kΩ
RL = 1kΩ
RL = 100Ω
RL = 32Ω
RL REFERENCED TO VCC/2
50
70
60
90
80
100
110
-40 10-15 35 60 85
LARGE-SIGNAL GAIN vs. TEMPERATURE
MAX4335 toc16
TEMPERATURE (
°
C)
LARGE-SIGNAL GAIN (dB)
VCC = 2.7V
RL = 100kΩ
VCC = 5V
RL = 100Ω
VCC = 2.7V
RL = 32Ω
70
-30
100 1k 10k 100k 1M 10M
-10
FREQUENCY
(
Hz
)
GAIN (dB)
PHASE (DEGREES)
10
30
50
-20
0
20
40
60
MAX4335-8 toc17
GAIN AND PHASE vs. FREQUENCY
AVCL = 1000V/V
216
-144
72
108
180
144
36
0
-108
-36
-72
70
-30
100 1k 10k 100k 1M 10M
-10
FRE
QU
EN
C
Y
(
Hz
)
GAIN (dB)
PHASE (DEGREES)
10
30
50
-20
0
20
40
60
MAX4335-8 toc18
GAIN AND PHASE vs. FREQUENCY
(CL = 200pF)
AVCL = 1000V/V
216
-144
72
108
180
144
36
0
-108
-36
-72
Typical Operating Characteristics (continued)
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = ∞to VCC/2, VS HDN = VCC, TA= +25°C, unless otherwise noted.)
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
8 _______________________________________________________________________________________
-60
-110
10 1k100 100k 10M
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY
-80
-90
-100
-70
MAX4335/8 toc23
FREQUENCY (Hz)
CHANNEL-TO-CHANNEL ISOLATION
10k 1M
SMALL-SIGNAL TRANSIENT RESPONSE
(NONINVERTING)
MAX4335 toc24
IN
20mV/div
OUT
20mV/div
200ns/div
LARGE-SIGNAL TRANSIENT RESPONSE
(NONINVERTING)
MAX4335 toc26
IN
2V/div
OUT
2V/div
2µs/div
VCC = 5V
SMALL-SIGNAL TRANSIENT RESPONSE
(INVERTING)
MAX4335 toc25
IN
20mV/div
OUT
20mV/div
200ns/div
LARGE-SIGNAL TRANSIENT RESPONSE
(INVERTING)
MAX4335 toc27
IN
2V/div
OUT
2V/div
2µs/div
VCC = 5V
10
0.001
3.0 4.03.5 5.0 5.5
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. PEAK-TO-PEAK OUTPUT VOLTAGE
0.01
0.1
1
MAX4335 toc22
PEAK-TO-PEAK OUTPUT VOLTAGE (V)
THD + NOISE (%)
4.5
FREQUENCY = 10kHz
RL = 100Ω
RL = 1kΩ
RL = 100kΩ
____________________________Typical Operating Characteristics (continued)
(VCC = 2.7V, GND = 0, VCM = 0, VOUT = VCC/2, RL = ∞to VCC/2, VS HDN = VCC, TA= +25°C, unless otherwise noted.)
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
_______________________________________________________________________________________ 9
Pin Description
PIN
MAX4337
MAX4335 MAX4336
SOT23 µMAX
MAX4338
NAME FUNCTION
1 1 3, 5 3, 5 3, 7 IN1+, IN2+Noninverting Input
2 2 4 4 4 GND Ground
3 3 2, 6 2, 6 2, 8 IN2-, IN2-Inverting Input
4 4 1, 7 1, 7 1, 9 OUT1, OUT2 Output(s)
5——— — N.C. No Connection. Not internally connected.
—5—— 5, 6 SHDN1, SHDN2 Drive SHDN low for shutdown. Drive SHDN
high or connect to VCC for normal operation.
6 6 8 8 10 VCC Positive Supply
Typical Application Circuit
MUTE
R INPUT
VREF
L INPUT
MAX4338
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
10 ______________________________________________________________________________________
Applications Information
Package Power Dissipation
Warning: Due to the high-output-current drive, this op
amp can exceed the absolute maximum power-dissi-
pation rating. As a general rule, as long as the peak cur-
rent is less than or equal to 50mA, the maximum package
power dissipation will not be exceeded for any of the
package types offered. There are some exceptions to this
rule, however. The absolute maximum power-dissipation
rating of each package should always be verified using
the following equations. The following equation gives an
approximation of the package power dissipation:
where: VRMS = the RMS voltage from VCC to VOUT
when sourcing current
= the RMS voltage from VOUT to VEE
when sinking current
IRMS = the RMS current flowing out of or into
the op amp and the load
θ= the phase difference between the
voltage and the current. For resistive
loads, COS θ= 1.
For example, the circuit in Figure 1 has a package
power dissipation of 220mW.
Therefore, PIC(DISS) = VRMS IRMS COS θ= 220mW
Adding a coupling capacitor improves the package
power dissipation because there is no DC current to
the load, as shown in Figure 2.
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.
V V V
I +
I
2
RMS CC DC
RMS PEAK
≅−
()
−
=− −=
≅=+
=
. . .
/
V
VV
VV
IA
V
mA
PEAK
RMS
DC
RMS
2
55 275 1
2
2 043
0132
2
22
Ω
V V V
I +
I
2
RMS CC DC
RMS PEAK
≅−
()
−
=− −=
≅=+
=
. . .
. /
V
VV
VV
IVV
mA
PEAK
RMS
DC
RMS
2
55 275 1
2
2 043
275
32
132
2
108
Ω
Ω
P V I COS
IC DISS RMS RMS
()
≅θ
5.5V
VIN = 2VP-P
R
C
32Ω
R
MAX4335
MAX4336
Figure 1. A Circuit Example where the MAX4335/MAX4336 is
Dissipating High Power
5.5V
VIN = 2VP-P
R
32Ω
R
CIN
CC
CC > 1
2π RL fL WHERE fL IS THE LOW-FREQUENCY CUTOFF
MAX4335
MAX4336
Figure 2. A Circuit Example where Adding a Coupling
Capacitor Greatly Reduces the Power Dissipation of Its
Package
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
______________________________________________________________________________________ 11
Single-Supply Speaker Driver
The MAX4335/MAX4336 can be used as a single-sup-
ply 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 resis-
tors R3 and R4, take into consideration the input bias
current as well as how much supply current can be tol-
erated. 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 capaci-
tor C2 sets a low-frequency pole and is fairly large in
value. For a 32Ωload, 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)
Rail-to-Rail Input Stage
Devices in the MAX4335–MAX4338 family of high-
output-current amplifiers have rail-to-rail input and output
stages designed for low-voltage, single-supply opera-
tion. 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 volt-
ages 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 capaci-
tance, 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 1kΩseries 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:
IBIAS = (VDIFF - 1.2V) / 8.4kΩ
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 con-
nected as a voltage follower. The maximum output volt-
age swing is load dependent; however, it is guaranteed
to be within 400mV of the positive rail (VCC = 2.7V)
even with maximum load (32Ωto 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.
R3
R3 = R1 R2
R1 R2
MAX4335–MAX4338
Figure 3. Reducing Offset Error Due to Bias Current
(Noninverting)
R3
R3 = R1 R2
R1 R2
MAX4335–MAX4338
Figure 4. Reducing Offset Error Due to Bias Current (Inverting)
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
12 ______________________________________________________________________________________
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 capaci-
tive-load-driving circuit in the unity-gain configuration.
The resistor improves the circuit’s phase margin by iso-
lating 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 high-impedance 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.
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 short-cir-
cuit protection feature. Figure 7 shows the output volt-
age 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 detect-
ed, 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).
4.2kΩ
4.2kΩ
Figure 5. Input Protection Circuit
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
______________________________________________________________________________________ 13
IN
(1V/div)
OUT
(1V/div)
Figure 6. Rail-to-Rail Input/Output Range
VOUT
VCC
VCC - 1V
1V
0
IN SOURCE MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT
ACTIVATED FOR (VCC - VOUT) < 1V. OUTPUT CURRENT CAN SAFELY
EXCEED 110mA.
IN SINK MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT
ACTIVATED FOR VOUT < 1V. OUTPUT CURRENT CAN SAFELY
EXCEED 110mA.
SHORT-CIRCUIT PROTECTION CIRCUITRY
LIMITS OUTPUT CURRENT TO 110mA
Figure 7. Short-Circuit Protection
1300
0
10 100k
100
200
300
400
1100
1200
MAX4335-fig07
RESISTIVE LOAD (Ω)
CAPACITIVE LOAD (pF)
100 1k 10k
1000
900
800
700
600
500
STABLE REGION
VCC = 5.0V
RL to VCC/2
UNSTABLE REGION
Figure 8. Capacitive-Load Stability
IN
(20mV/div)
OUT
(20mV/div)
MAX4335-fig08
1µs/div
VCC = 3.0V, CL = 330pF
RL = 100kΩ, RISO = 0
Figure 9. Small-Signal Transient Response with Excessive
Capacitive Load
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
14 ______________________________________________________________________________________
SHDN
1V/div
OUT
1V/div
MAX4335-fig11
5µs/div
Figure 12. Shutdown Output Voltage Enable/Disable
VCC
1V/div
OUT
2V/div
MAX4335-fig12
5µs/div
Figure 13. Power-Up/Down Output Voltage
IN
(20mV/div)
OUT
(20mV/div)
1µs/div
VCC = 3.0V, CL = 330pF
RL = 100kΩ, RISO = 39Ω
Figure 10. Small-Signal Transient Response with Excessive
Capacitive Load with Isolation Resistor
RISO
CL
MAX4336
Figure 11. Capacitive-Load-Driving Circuit
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
______________________________________________________________________________________ 15
___________________Chip Information
MAX4335 TRANSISTOR COUNT: 1200
MAX4336 TRANSISTOR COUNT: 1200
MAX4337 TRANSISTOR COUNT: 2400
MAX4338 TRANSISTOR COUNT: 2400
PROCESS: BiCMOS
Pin Configurations
TOP VIEW
IN2-
IN2+
GND
1
2
8
7
VCC
OUT2
IN1-
IN1+
OUT1
SOT23/µMAX
3
4
6
5
MAX4337
1
2
3
4
5
10
9
8
7
6
VCC
OUT2
IN2-
IN2+
GND
IN1+
IN1-
OUT1
MAX4338
µMAX
SHDN2SHDN1
GND
( ) MAX4335 ONLY
OUTIN-
16V
CC
5 SHDN (N.C.)
IN+
MAX4335
MAX4336
SC70
2
34
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
16 ______________________________________________________________________________________
SOT23, 8L.EPS 8LUMAXD.EPS
PACKAGE OUTLINE, 8L uMAX/uSOP
1
1
21-0036 J
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
MAX
0.043
0.006
0.014
0.120
0.120
0.198
0.026
0.007
0.037
0.0207 BSC
0.0256 BSC
A2 A1
c
eb
A
L
FRONT VIEW SIDE VIEW
E H
0.6±0.1
0.6±0.1
ÿ 0.50±0.1
1
TOP VIEW
D
8
A2 0.030
BOTTOM VIEW
16∞
S
b
L
H
E
D
e
c
0∞
0.010
0.116
0.116
0.188
0.016
0.005
8
4X S
INCHES
-
A1
A
MIN
0.002
0.950.75
0.5250 BSC
0.25 0.36
2.95 3.05
2.95 3.05
4.78
0.41
0.65 BSC
5.03
0.66
6∞0∞
0.13 0.18
MAX
MIN
MILLIMETERS
- 1.10
0.05 0.15
α
α
DIM
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17
© 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
10LUMAX.EPS
PACKAGE OUTLINE, 10L uMAX/uSOP
1
1
21-0061 I
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
1
0.498 REF
0.0196 REF
S
6∞
SIDE VIEW
α
BOTTOM VIEW
0∞0∞6∞
0.037 REF
0.0078
MAX
0.006
0.043
0.118
0.120
0.199
0.0275
0.118
0.0106
0.120
0.0197 BSC
INCHES
1
10
L1
0.0035
0.007
e
c
b
0.187
0.0157
0.114
H
L
E2
DIM
0.116
0.114
0.116
0.002
D2
E1
A1
D1
MIN
-A
0.940 REF
0.500 BSC
0.090
0.177
4.75
2.89
0.40
0.200
0.270
5.05
0.70
3.00
MILLIMETERS
0.05
2.89
2.95
2.95
-
MIN
3.00
3.05
0.15
3.05
MAX
1.10
10
0.6±0.1
0.6±0.1
ÿ 0.50±0.1
H
4X S
e
D2
D1
b
A2 A
E2
E1 L
L1
c
α
GAGE PLANE
A2 0.030 0.037 0.75 0.95
A1
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
