19-2136; Rev 1; 9/01
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
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
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
—
PART
TOP
MARK
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
VIN
THD + NOISE (%)
C2
MAX4335
MAX4336
R4
32Ω
0.004
0.003
R2
R1
C3
0.002
10
100
1k
10k
100k
FREQUENCY (Hz)
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4335–MAX4338
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.
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
CONDITIONS
MIN
Inferred from PSRR Test
2.7
TYP
MAX
UNITS
5.5
V
Operating Supply Voltage Range
VCC
Quiescent Supply Current (Per
Amplifier)
ICC
Input Offset Voltage
VOS
VCM = GND to VCC
±0.6
±3
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
Input Bias Current
Input Offset Current
Differential Input Resistance
Input Common-Mode Voltage
Range
RIN(Diff)
VCM
VCC = 5.5V
1.3
VCC = 2.7
1.2
Inferred from CMRR Test
GND
Common-Mode Rejection Ratio
CMRR
VCM = GND to VCC
60
Power-Supply Rejection Ratio
PSRR
VCC = 2.7V to 5.5V
70
Output Resistance
ROUT
AVCL = 1V/V
VCC = 5V: RL = 10kΩ
VOUT = 0.4V to 4.6V
Large-Signal Voltage Gain
AVOL
Output Voltage Swing
VOUT
2
90
dB
0.05
Ω
95
VCC = 2.7V: RL = 32Ω
VOUT = 0.5V to 2.2V
62
72
VCC = 5V;
RL = 100Ω
V
dB
84
VCC = 5V;
RL = 10kΩ
mV
80
70
VCC = 2.7V;
RL = 32Ω
mA
kΩ
VCC
VCC = 5V: RL = 100Ω
VOUT = 0.5V to 4.5V
VCC = 2.7V;
RL = 10kΩ
1.8
dB
VCC - VOH
100
VOL
100
VCC - VOH
220
400
VOL
280
400
VCC - VOH
100
VOL
100
VCC - VOH
190
350
VOL
240
350
_______________________________________________________________________________________
mV
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
MAX4335–MAX4338
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
VCC = 2.7V;
ISOURCE,
ISINK = 50mA
VCC - VOH
270
500
VOL
360
500
VCC = 5V;
ISOURCE,
ISINK = 50mA
VCC - VOH
270
500
VOL
360
500
IOUT
Short-Circuit Current
mV
ISC
110
VIH
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 Logic Levels
SHDN Leakage Current
UNITS
mA
0.7 x VCC
0.3 x VCC
V
0.5
µA
0.01
0.5
µA
1V
= 2.043VRMS
2
2.75V
1V / 32Ω
=
+
32Ω
2
2
= 108mARMS
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.
(
)
VPEAK
VRMS ≅ VCC − VDC −
2
= 5.5V − 2.75V −
1V
= 2.043VRMS
2
I
IRMS ≅ IDC + PEAK
2
= 22mARMS
10
MAX4335
MAX4336
32Ω
2
= 5.5V − 2.75V −
IRMS ≅ IDC +
R
VPEAK
VRMS ≅ VCC − VDC −
IPEAK
CC
= 0A +
1
2π RL fL WHERE fL IS THE LOW-FREQUENCY CUTOFF
Figure 2. A Circuit Example where Adding a Coupling
Capacitor Greatly Reduces the Power Dissipation of Its
Package
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.
1V / 32Ω
2
______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
Rail-to-Rail Input Stage
Devices in the MAX4335–MAX4338 family of highoutput-current 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:
IBIAS = (VDIFF - 1.2V) / 8.4kΩ
MAX4335–MAX4338
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)
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.
______________________________________________________________________________________
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-load-driving 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 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.
12
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-circuit 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).
______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
MAX4335–MAX4338
VOUT
VCC
IN SOURCE MODE, SHORT-CIRCUIT PROTECTION CIRCUITRY IS NOT
ACTIVATED FOR (VCC - VOUT) < 1V. OUTPUT CURRENT CAN SAFELY
EXCEED 110mA.
IN
(1V/div)
VCC - 1V
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
CAPACITIVE LOAD (pF)
MAX4335-fig07
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
VCC = 5.0V
RL to VCC/2
IN
(20mV/div)
UNSTABLE REGION
OUT
(20mV/div)
STABLE REGION
10
100
VCC = 3.0V, CL = 330pF
RL = 100kΩ, RISO = 0
MAX4335-fig08
Figure 7. Short-Circuit Protection
Figure 6. Rail-to-Rail Input/Output Range
1k
10k
100k
1µs/div
RESISTIVE LOAD (Ω)
Figure 8. Capacitive-Load Stability
Figure 9. Small-Signal Transient Response with Excessive
Capacitive Load
______________________________________________________________________________________
13
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
Figure 10. Small-Signal Transient Response with Excessive
Capacitive Load with Isolation Resistor
MAX4335-fig11
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
VCC
1V/div
SHDN
1V/div
OUT
1V/div
OUT
2V/div
5µs/div
Figure 12. Shutdown Output Voltage Enable/Disable
14
5µs/div
Figure 13. Power-Up/Down Output Voltage
______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
TOP VIEW
IN+ 1
GND 2
IN
-
6
MAX4335
MAX4336
3
VCC
OUT1 1
IN1- 2
5
4
SHDN (N.C.)
OUT
SC70
8
VCC
7
OUT2
MAX4337
IN1+ 3
6
IN2-
GND 4
5
IN2+
SOT23/µMAX
10 VCC
OUT1 1
IN1-
2
IN1+
3
GND
SHDN1
9
OUT2
8
IN2-
4
7
IN2+
5
6
SHDN2
MAX4338
µMAX
( ) MAX4335 ONLY
___________________Chip Information
MAX4335 TRANSISTOR COUNT: 1200
MAX4336 TRANSISTOR COUNT: 1200
MAX4337 TRANSISTOR COUNT: 2400
MAX4338 TRANSISTOR COUNT: 2400
PROCESS: BiCMOS
______________________________________________________________________________________
15
MAX4335–MAX4338
Pin Configurations
Package Information
4X S
8
E
ÿ 0.50±0.1
8
INCHES
DIM
A
A1
A2
b
H
c
D
e
E
H
0.6±0.1
1
L
1
α
0.6±0.1
S
BOTTOM VIEW
D
MIN
0.002
0.030
MAX
0.043
0.006
0.037
0.014
0.010
0.007
0.005
0.120
0.116
0.0256 BSC
0.120
0.116
0.198
0.188
0.026
0.016
6∞
0∞
0.0207 BSC
8LUMAXD.EPS
(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.)
MILLIMETERS
MAX
MIN
0.05
0.75
1.10
0.15
0.95
0.25
0.36
0.13
0.18
2.95
3.05
0.65 BSC
2.95
3.05
4.78
5.03
0.41
0.66
0∞
6∞
0.5250 BSC
TOP VIEW
A1
A2
e
FRONT VIEW
A
α
c
b
L
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
21-0036
REV.
J
1
1
SOT23, 8L.EPS
MAX4335–MAX4338
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
16
______________________________________________________________________________________
SC70/SOT23-8, 50mA IOUT, Rail-to-Rail I/O
Op Amps with Shutdown/Mute
10LUMAX.EPS
e
4X S
10
INCHES
10
H
ÿ 0.50±0.1
0.6±0.1
1
1
0.6±0.1
BOTTOM VIEW
TOP VIEW
D2
MILLIMETERS
MAX
DIM MIN
0.043
A
0.002
0.006
A1
A2
0.030
0.037
0.116
0.120
D1
D2
0.114
0.118
E1
0.116
0.120
0.118
E2
0.114
0.199
H
0.187
L
0.0157 0.0275
L1
0.037 REF
b
0.007
0.0106
e
0.0197 BSC
c
0.0035 0.0078
0.0196 REF
S
α
0∞
6∞
MAX
MIN
1.10
0.05
0.15
0.75
0.95
2.95
3.05
3.00
2.89
3.05
2.95
2.89
3.00
4.75
5.05
0.40
0.70
0.940 REF
0.177
0.270
0.500 BSC
0.090
0.200
0.498 REF
0∞
6∞
E2
GAGE PLANE
A2
c
A
b
D1
A1
α
FRONT VIEW
E1
L
L1
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
21-0061
REV.
I
1
1
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.
MAX4335–MAX4338
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.)
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