MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
General Description
The MAX4230–MAX4234 single/dual/quad, high-output
drive CMOS op amps feature 200mA of peak output current, rail-to-rail input, and output capability from a single
2.7V to 5.5V supply. These amplifiers exhibit a high slew
rate of 10V/μs and a gain-bandwidth product (GBWP) of
10MHz. The MAX4230–MAX4234 can drive typical headset
levels (32Ω), as well as bias an RF power amplifier (PA)
in wireless handset applications.
The MAX4230 comes in a tiny 5-pin SC70 package
and the MAX4231, single with shutdown, is offered in
a 6-pin SC70 package and in 1.5mm x 1.0mm UCSP
and thin μDFN packages. The dual op-amp MAX4233 is
offered in the space-saving 10-bump chip-scale package
(UCSP™), providing the smallest footprint area for a dual
op amp with shutdown.
These op amps are designed to be part of the PA control
circuitry, biasing RF PAs in wireless headsets. The MAX4231/
MAX4233 offer a SHDN feature that drives the output low.
This ensures that the RF PA is fully disabled when needed,
preventing unconverted signals to the RF antenna.
Applications
●
●
●
●
●
●
●
●
RF PA Biasing Controls in Handset Applications
Portable/Battery-Powered Audio Applications
Portable Headphone Speaker Drivers (32Ω)
Audio Hands-Free Car Phones (Kits)
Tablet/Notebook Computers
Digital-to-Analog Converter Buffers
Transformer/Line Drivers
Motor Drivers
Benefits and Features
● Optimized for Headsets and High-Current Outputs
• 200mA Output Drive Capability
• 100dB Voltage Gain (RL = 100kΩ)
• 85dB Power-Supply Rejection Ratio
• No Phase Reversal for Overdriven Inputs
• Unity-Gain Stable for Capacitive Loads to 780pF
● Suitable for High-Bandwidth Applications
• 10MHz Gain-Bandwidth Product
• High Slew Rate: 10V/μs
● Extends the Battery Life of Portable Applications
• 1.1mA Supply Current per Amplifier
● Low-Power Shutdown Mode Reduces Supply Current
to < 1μA
● Small Package Options
• Tiny, 2.1mm x 2.0mm Space-Saving SC70 Package
● AEC-Q100 Qualified, See the Ordering Information
for the List of /V Parts
Ordering Information
MAX4230AXK+T
TEMP
RANGE
-40°C to +125°C
PINPACKAGE
5 SC70
TOP
MARK
ACS
MAX4230AUK+T
-40°C to +125°C
5 SOT23
ABZZ
MAX4231AXT+T
-40°C to +125°C
6 SC70
MAX4231AUT+T
-40°C to +125°C
6 SOT23
ABNF
MAX4231ART+T
-40°C to +125°C
6 UCSP
AAM
-40°C to +125°C
6 Thin µDFN
(Ultra-Thin LGA)
+AH
PART
MAX4231AYT+T
ABA
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information continued at end of data sheet.
Typical Operating Circuit
ANTENNA
2.7V TO 5.5V
Selector Guide appears at end of data sheet.
Pin/Bump Configurations appear at end of data sheet.
ILOAD = 30mA
RISO
SHDN
C
R
19-2164; Rev 23; 5/21
PA
CLOAD
Visit www.maximintegrated.com/en/aboutus/legal/patents.
html for product patent marking information.
UCSP is a trademark of Maxim Integrated Products, Inc.
MAX4231
DAC
RF
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Absolute Maximum Ratings
Supply Voltage (VDD to VSS) ................................................6V
All Other Pins ...................................(VSS - 0.3V) to (VDD + 0.3V)
Output Short-Circuit Duration to VDD or VSS (Note 1) ...............10s
Continuous Power Dissipation (Multilayer, TA = +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............247mW
5-Pin SOT23 (derate 3.9mW/°C above +70°C)............313mW
6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW
6-Pin SOT23 (derate 13.4mW/°C above +70°C)........1072mW
6-Pin Thin µDFN (derate 2.1mW/°C above +70°C)...170.2mW
6-Bump UCSP (derate 3.9mW/°C above +70°C) .....308.3mW
8-Pin SOT23 (derate 5.1mW/°C above +70°C).........408.2mW
8-Pin µMAX® (derate 4.8mW/°C above +70°C) .......387.8mW
10-Pin µMAX (derate 8.8mW/°C above +70°C) .......707.3mW
10-Bump UCSP (derate 5.6mW/°C above +70°C) .....448.7mW
14-Pin SO (derate 11.9mW/°C above +70°C) ..........952.4mW
14-Pin TSSOP (derate 10mW/°C above +70°C) ......796.8mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature
(excluding 6 and 10 UCSP, soldering, 10s) ................+300°C
Soldering Temperature (reflow) .......................................+260°C
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Note 1: Package power dissipation should also be observed.
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
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), VSHDN = VDD, TA = +25°C, unless otherwise
noted.) (Note 2)
PARAMETER
SYMBOL
Operating Supply Voltage
Range
VDD
Input Offset Voltage
VOS
Input Bias Current (Note 4)
CONDITIONS
Inferred from PSRR test
VCM = VSS to VDD
VCM = VSS to VDD
Input Offset Current
IOS
RIN
Common-Mode Input
Voltage Range
VCM
TYP
2.7
0.85
IB
Input Resistance
MIN
Inferred from CMRR test
MAX
UNITS
5.5
V
±6
mV
1
pA
1
pA
1000
MΩ
VSS
VDD
V
Common-Mode Rejection
Ratio
CMRR
VSS < VCM < VDD
52
70
dB
Power-Supply Rejection
Ratio
PSRR
VDD = 2.7V to 5.5V
73
85
dB
Shutdown Output
Impedance
ROUT
VSHDN = 0V (Note 3)
10
Ω
VSHDN = 0V, RL = 200Ω (Note 3)
68
mV
Output Voltage in Shutdown
Large-Signal Voltage Gain
VOUT(SHDN)
AVOL
VSS + 0.20V <
VOUT < VDD 0.20V
RL = 32Ω
Output Voltage Swing
VOUT
RL = 200Ω
RL = 2kΩ
www.maximintegrated.com
RL = 100kΩ
100
RL = 2kΩ
85
RL = 200Ω
74
dB
98
80
VDD - VOH
400
500
VOL - VSS
360
500
VDD - VOH
80
120
VOL - VSS
70
120
VDD - VOH
8
14
VOL - VSS
7
14
mV
Maxim Integrated │ 2
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
DC Electrical Characteristics (continued)
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), VSHDN = VDD, TA = +25°C, unless otherwise
noted.) (Note 2)
PARAMETER
Output Source/Sink
Current
SYMBOL
IOUT
CONDITIONS
IDD
Shutdown Supply Current
(per Amplifier) (Note 3)
IDD(SHDN)
SHDN Logic Threshold
(Note 3)
VDD = 5V, VIN = ±100mV
200
MAX
128
200
VOL - VSS
112
175
VDD - VOH
240
320
VOL - VSS
224
300
VDD = 5.5V, VCM = VDD/2
1.2
2.3
VDD = 2.7V, VCM = VDD/2
1.1
2.0
VDD = 5.5V
0.5
1
VDD = 2.7V
0.1
1
VDD =
2.7V
IL = 30mA
VDD = 5V
VSHDN = 0V,
RL = ∞
Shutdown mode
VIH
Normal mode
0.8
VDD x 0.57
VSS < VSHDN < VDD (Note 3)
UNITS
mA
VDD - VOH
IL = 10mA
VIL
SHDN Input Bias Current
TYP
70
Output Voltage
Quiescent Supply Current
(per Amplifier)
MIN
VDD = 2.7V, VIN = ±100mV
50
mV
mA
µA
V
pA
DC Electrical Characteristics
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), VSHDN = VDD, TA = -40 to +125°C, unless other
wise noted.) (Note 2)
PARAMETER
SYMBOL
Operating Supply Voltage
Range
VDD
Input Offset Voltage
VOS
Offset-Voltage Tempco
Input Bias Current
(Note 4)
Common-Mode Input Voltage
Range
Common-Mode Rejection
Ratio
Power-Supply Rejection Ratio
Inferred from PSRR test
IB
VCM
5.5
V
±8
mV
µV/°C
17
TA = -40°C to +125°C
550
Inferred from CMRR test
VSS
PSRR
VDD = 2.7V to 5.5V
70
VOUT
UNITS
TA = -40°C to +85°C
46
AVOL
MAX
±3
VSS < VCM < VDD
Large-Signal Voltage Gain
TYP
2.7
CMRR
VOUT(SHDN)
VSHDN = 0V, RL = 200Ω (Note 3)
VDD
V
dB
150
RL = 2kΩ
76
RL = 200Ω
67
RL = 32Ω
TA = +85°C
VDD - VOH
650
VOL - VSS
650
VDD - VOH
150
VOL - VSS
150
VDD - VOH
20
VOL - VSS
20
RL = 200Ω
pA
dB
VSS + 0.20V
< VDD - 0.20V
RL = 2kΩ
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MIN
∆VOS/∆T
Output Voltage in Shutdown
Output Voltage Swing
CONDITIONS
mV
dB
mV
Maxim Integrated │ 3
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
DC Electrical Characteristics
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), VSHDN = VDD, TA = -40 to +125°C, unless other
wise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
VDD =
2.7V
IL = 10mA
Output Voltage
IL = 30mA
TA = -40°C
to +85°
Quiescent Supply Current
(per Amplifier)
IDD
Shutdown Supply Current
(per Amplifier) (Note 3)
IDD(SHDN)
SHDN Logic Threshold
(Note 3)
VDD = 5V
MIN
TYP
MAX
VDD - VOH
250
VOL - VSS
230
VDD - VOH
400
VOL - VSS
370
VDD = 5.5V, VCM = VDD/2
2.8
VDD = 2.7V, VCM = VDD/2
2.5
VSHDN < 0V, RL = ∞
VIL
Shutdown mode
VIH
Normal mode
VDD = 5.5V
2.0
VDD = 2.7V
2.0
0.8
VDD x 0.61
UNITS
mV
mA
µA
V
AC Electrical Characteristics
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL = ∞ connected to (VDD/2), VSHDN = VDD, TA = +125°C, unless otherwise
noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Gain-Bandwidth Product
GBWP
VCM = VDD/2
10
MHz
Full-Power Bandwidth
FPBW
VOUT = 2VP-P, VDD = 5V
0.8
MHz
Slew Rate
SR
10
V/μs
Phase Margin
PM
70
Degrees
Gain Margin
GM
15
dB
0.0005
%
8
pF
Total Harmonic Distortion
Plus Noise
THD+N
Input Capacitance
CIN
Voltage-Noise Density
en
f = 10kHz, VOUT = 2VP-P,
AVCL = 1V/V
f = 1kHz
15
f = 10kHz
12
Channel-to-Channel
Isolation
f = 1kHz, RL = 100kΩ
125
dB
Capacitive-Load Stability
AVCL = 1V/V, no sustained oscillations
780
pF
Shutdown Time
Enable Time from
Shutdown
Power-Up Time
nV/√Hz
tSHDN
(Note 3)
1
µs
tENABLE
(Note 3)
6
µs
5
µs
tON
Note 2: All units 100% tested at +25°C. All temperature limits are guaranteed by design.
Note 3: SHDN logic parameters are for the MAX4231/MAX4233 only.
Note 4: Guaranteed by design.
www.maximintegrated.com
Maxim Integrated │ 4
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Typical Operating Characteristics
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = VDD/2, RL = ∞, connected to VDD/2, VSHDN = VDD, TA = +25°C, unless otherwise noted.)
GAIN AND PHASE vs. FREQUENCY
(CL = 250pF)
120
60
90
50
60
40
30
30
0
20
-30
10
-60
0
-90
-10
-120
AV = 1000V/V
-30
0.01k 0.1k
1k
-150
10k
100k
1M
60
40
30
30
0
20
-30
10
-60
0
-90
-10
-120
AV = 1000V/V
CL = 250pF
-30
0.01k 0.1k
FREQUENCY (Hz)
1k
1M
-180
10M 100M
-30
-40
-50
-60
-70
100
OUTPUT IMPEDANCE (Ω)
MAX4230 toc03
-20
10
1
0.1
-80
AV = 1V/V
AV = 1V/V
-90
-100
0.01k
0.1k
1k
10k
100k
1M
0.01
10M
1k
10k
1.2
1.0
0.8
0.6
0.4
MAX4230 toc06
100
SUPPLY CURRENT (nA)
1.4
90
80
70
60
0.2
-40 -20
0
20
40
60
80
TEMPERATURE (°C)
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10M
110
MAX4230 toc05
1.6
1M
SUPPLY CURRENT vs. TEMPERATURE
(SHDN = LOW)
SUPPLY CURRENT vs. TEMPERATURE
1.8
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
SUPPLY CURRENT (mA)
100k
OUTPUT IMPEDANCE vs. FREQUENCY
0
0
10k
1000
-10
2.0
-150
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
PSRR (dB)
90
50
-20
-180
10M 100M
120
60
MAX4230 toc04
-20
MAX4230 toc02
70
GAIN (dB)
GAIN (dB)
70
PHASE (°)
MAX4230 toc01
PHASE (°)
GAIN AND PHASE vs. FREQUENCY
100 120
50
SHDN = VSS
-40 -20
0
20
40
60
80 100 120
TEMPERATURE (C)
Maxim Integrated │ 5
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Typical Operating Characteristics (continued)
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = VDD/2, RL = ∞, connected to VDD/2, VSHDN = VDD, TA = +25°C, unless otherwise noted.)
1.8
1.6
MAX4230 toc08
2
MAX4230 toc07
2.0
VDD = 2.7V
1.0
0.8
0.6
80
VDD - VOUT (mV)
1.2
VDD = 5.0V
0
-1
0.4
VDD = 5.0V
RL = 200Ω
100
1
1.4
VOS (mV)
SUPPLY CURRENT (mA)
OUTPUT SWING HIGH
vs. TEMPERATURE
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX4230/34 toc09
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
VDD = 2.7V
RL = 200Ω
60
40
20
0.2
2.5
3.0
3.5
4.0
4.5
5.0
80
0
100 120
0
20
40
60
-40 -20
0
20
40
60
100 120
80
0
-0.5
-1.0
MAX4230/3 toc12
1.2
SUPPLY CURRENT (mA)
0.5
1.0
0.8
0.6
0.4
-1.5
-2.0
80 100 120
MAX4230/3 toc11
MAX4230/3 toc10
VDD = 2.7V
RL = 200Ω
1.0
VDD = 2.7V
0
0.5
1.5
1.0
2.0
0.2
2.5
0
0.5
1.5
1.0
2.0
2.5
COMMON-MODE VOLTAGE (V)
COMMON-MODE VOLTAGE (V)
SUPPLY CURRENT PER AMPLIFIER
vs. COMMON-MODE VOLTAGE
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. PEAK-TO-PEAK OUTPUT VOLTAGE
0.45
MAX4230/34 toc13
1.4
1.2
VOUT = 2VP-P
500kHz LOWPASS FILTER
0.40
10
0.35
1
0.30
THD+N (%)
1.0
0.8
0.25
0.20
f = 10kHz
VDD = 5V
RL = 25
RL = 2k
RL = 100k
RL = 250
MAX4230/34 toc15
TEMPERATURE (°C)
THD+N (%)
VOUT - VSS (mV)
60
SUPPLY CURRENT PER AMPLIFIER
vs. COMMON-MODE VOLTAGE
20
SUPPLY CURRENT (mA)
40
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
40
0.1
0.15
0.6
VDD = 5.0V
0.4
0.2
20
OUTPUT SWING LOW
vs. TEMPERATURE
60
-40 -20
0
TEMPERATURE (°C)
80
0
-20
TEMPERATURE (°C)
VDD = 5.0V
RL = 200Ω
100
-40
SUPPLY VOLTAGE (V)
140
120
-2
5.5
MAX4230/34 toc14
2.0
INPUT OFFSET VOLTAGE (mV)
0
RL = 32
0.10
0.05
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
COMMON-MODE VOLTAGE (V)
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0
0.001
RL = 10k
10
100
1k
FREQUENCY (Hz)
10k
100k
0.0001
4.0
4.2
4.4
4.6
4.8
5.0
PEAK-TO-PEAK OUTPUT VOLTAGE (V)
Maxim Integrated │ 6
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Typical Operating Characteristics (continued)
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = VDD/2, RL = ∞, connected to VDD/2, VSHDN = VDD, TA = +25°C, unless otherwise noted.)
SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
LARGE-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
SMALL-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4230/34 toc17
MAX4230/34 toc16
MAX4230/34 toc18
IN
IN
IN
50mV/div
50mV/div
1V/div
OUT
OUT
OUT
400ns/div
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SOURCING, VDD = 2.7V)
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SINKING, VDD = 2.7V)
OUTPUT CURRENT (mA)
70
1V/div
OUT
60
50
40
30
20
200
150
100
2.0
2.5
3.0
3.5
4.0
OUTPUT VOLTAGE (V)
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4.5
5.0
-30
-40
-50
-60
-80
0
0.2
0.4
0.6
0.8
1.0
1.2
OUTPUT VOLTAGE (V)
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SINKING, VDD = 5.0V)
INPUT VOLTAGE NOISE
vs. FREQUENCY
VDIFF = 100mV
-50
-100
-150
-250
-20
OUTPUT VOLTAGE (V)
-200
50
0
0
OUTPUT CURRENT (mA)
VDIFF = 100mV
MAX4230/34 toc22
OUTPUT CURRENT (mA)
250
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SOURCING, VDD = 5.0V)
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
MAX4230/34 toc23
0
VDIFF = 100mV
-10
-70
10
400ns/div
0
0
0.5
1.0
1.5
2.0
OUTPUT VOLTAGE (V)
2.5
3.0
200
100
10
100
1.4
1.6
MAX4230/34 toc24
IN
VDIFF = 100mV
OUTPUT CURRENT (mA)
80
INPUT VOLTAGE NOISE (nV/√Hz)
MAX4230/34 toc19
MAX4230/34 toc21
400ns/div
MAX4230/34 toc20
400ns/div
1k
10k
100k
FREQUENCY (Hz)
Maxim Integrated │ 7
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Pin Description
PIN
BUMP
MAX4231
MAX4230
MAX4232
SOT23/
MAX4233 MAX4234 MAX4231
SOT23/
SOT23/
SC70/Thin
TSSOP/SO
µMAX
UCSP
SC70
µMAX
µDFN
MAX4233
UCSP
NAME
FUNCTION
1
1
—
—
—
B1
—
IN+
Noninverting Input
2
2
4
4
11
A1
B4
VSS
Negative Supply Input.
Connect to ground for singlesupply operation.
3
3
—
—
—
B2
—
IN-
Inverting Input
4
4
—
—
—
A2
—
OUT
Amplifier Output
5
6
8
10
4
A3
B1
VDD
Positive Supply Input
—
5
—
5, 6
—
B3
C4, A4
SHDN,
SHDN1,
SHDN2
—
—
3
3
3
—
C3
IN1+
Noninverting Input to Amplifier 1
—
—
2
2
2
—
C2
IN1-
Inverting Input to Amplifier 1
Shutdown Control. Tie to high
for normal operation.
—
—
1
1
1
—
C1
OUT1
Amplifier 1 Output
—
—
5
7
5
—
A3
IN2+
Noninverting Input to Amplifier 2
—
—
6
8
6
—
A2
IN2-
Inverting Input to Amplifier 2
—
—
7
9
7
—
A1
OUT2
—
—
—
—
10, 12
—
—
—
—
—
—
9, 13
—
—
—
—
—
—
8, 14
—
—
Detailed Description
Rail-to-Rail Input Stage
The MAX4230–MAX4234 CMOS operational amplifiers
have parallel-connected n- and p-channel differential
input stages that combine to accept a common-mode
range extending to both supply rails. The n-channel
stage is active for common-mode input voltages typically
greater than (VSS + 1.2V), and the p-channel stage is
active for common-mode input voltages typically less than
(VDD - 1.2V).
Applications Information
Package Power Dissipation
Warning: Due to the high output current drive, this
op amp can exceed the absolute maximum powerdissipation rating. As a general rule, as long as the
peak current is less than or equal to 40mA, the maximum
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IN3+,
N4+
IN3-,
IN4OUT3,
OUT4
Amplifier 2 Output
Noninverting Input to Amplifiers 3
Inverting Input to Amplifiers 3
and
Amplifiers 3 and 4 Outputs
package power dissipation is not 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 equation below gives an
approximation of the package power dissipation:
PIC(DISS) ≅ VRMS IRMS COSθ
where:
VRMS = RMS voltage from VDD to VOUT when sourcing
current and RMS voltage from VOUT to VSS when sinking
current.
IRMS = RMS current flowing out of or into the op amp and
the load.
θ = phase difference between the voltage and the current.
For resistive loads, COS θ = 1.
Maxim Integrated │ 8
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
RF
3.6V
LEFT
AUDIO INPUT
CIN
RIN
COUT
HEADPHONE JACK
TO 32Ω STEREO
HEADSET
R
C
MAX4230
MAX4231
VIN = 2VP-P
VBIAS
MAX4230
R
COUT
32Ω
RIGHT
AUDIO INPUT
Figure 1. MAX4230/MAX4231 Used in Single-Supply Operation
Circuit Example
For example, the circuit in Figure 1 has a package power
dissipation of 196mW:
RMS ≅ (VDD − VDC ) +
= 3.6V − 1.8V +
VPEAK
1.0V
2
= 2.507VRMS
2
I
1.8V 1.0V / 32Ω
+
IRMS ≅ IDC + PEAK =
32Ω
2
2
= 78.4mA RMS
where:
VDC = the DC component of the output voltage.
IDC = the DC component of the output current.
VPEAK = the highest positive excursion of the AC component of the output voltage.
IPEAK = the highest positive excursion of the AC component of the output current.
Therefore:
PIC(DISS) = VRMS IRMS COS θ
= 196mW
Adding a coupling capacitor improves the package power
dissipation because there is no DC current to the load, as
shown in Figure 2:
CIN
RIN
RF
Figure 2. Circuit Example: Adding a Coupling Capacitor Greatly
Reduces Power Dissipation of its Package
VRMS ≅
VPEAK
2
1.0V
= = 0.707VRMS
2
I
1.0V / 32Ω
IRMS ≅ IDC + PEAK =0A +
2
2
= 22.1mA RMS
Therefore:
PIC(DISS) = VRMS IRMS COS θ
= 15.6mW
If the configuration in Figure 1 were used with all four of
the MAX4234 amplifiers, the absolute maximum power
dissipation rating of this package would be exceeded (see
the Absolute Maximum Ratings section).
60mW Single-Supply Stereo
Headphone Driver
Two MAX4230/MAX4231s can be used as a single-supply,
stereo headphone driver. The circuit shown in Figure 2 can
deliver 60mW per channel with 1% distortion from a single
5V supply.
The input capacitor (CIN), in conjunction with RIN, forms a
highpass filter that removes the DC bias from the incoming signal. The -3dB point of the highpass filter is given by
f −3dB =
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1
2πR INC IN
Maxim Integrated │ 9
MAX4230–MAX4234
C1
0.1mF
R1
16kΩ
R2
82kΩ
0.5VP-P
3V
3V
2
R5
51kΩ
C2
0.1µF
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
32W
fS = 100Hz
1/2
MAX4232
8
3
VCC = 3.0V
RL = 100kΩ
1
4
R4
10kΩ
R3
10kΩ
6
R6
51kΩ
5
IN
1V/div
OUT
1V/div
7
1/2
MAX4232
5µs/div
Figure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW
at 3V
Figure 4. Rail-to-Rail Input/Output Range
Choose gain-setting resistors RIN and RF according to
the amount of desired gain, keeping in mind the maximum
output amplitude. The output coupling capacitor, COUT,
blocks the DC component of the amplifier output, preventing DC current flowing to the load. The output capacitor
and the load impedance form a highpass filer with the
-3dB point determined by:
Rail-to-Rail Output Stage
f −3dB =
1
2πR INC OUT
For a 32Ω load, a 100μF aluminum electrolytic capacitor
gives a low-frequency pole at 50Hz.
Bridge Amplifier
The circuit shown in Figure 3 uses a dual MAX4230 to
implement a 3V, 200mW amplifier suitable for use in sizeconstrained applications. This configuration eliminates
the need for the large coupling capacitor required by the
single op-amp speaker driver when single-supply operation is necessary. Voltage gain is set to 10V/V; however,
it can be changed by adjusting the 82kΩ resistor value.
Rail-to-Rail Input Stage
The MAX4230–MAX4234 CMOS op amps have parallel
connected n- and p-channel differential input stages that
combine to accept a common-mode range extending
to both supply rails. The n-channel stage is active for
common-mode input voltages typically greater than (VSS
+ 1.2V), and the p-channel stage is active for commonmode input voltages typically less than (VDD - 1.2V).
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The minimum output is within millivolts of ground for
single-supply operation, where the load is referenced to
ground (VSS). Figure 4 shows the input voltage range
and the output voltage swing of a MAX4230 connected
as a voltage follower. The maximum output voltage swing
is load dependent; however, it is guaranteed to be within
500mV of the positive rail (VDD = 2.7V) even with maximum load (32Ω to ground).
Observe the Absolute Maximum Ratings for power dissipation and output short-circuit duration (10s, max)
because the output current can exceed 200mA (see the
Typical Operating Characteristics.)
Input Capacitance
One consequence of the parallel-connected differential
input stages for rail-to-rail operation is a relatively large
input capacitance CIN (5pF typ). This introduces a pole
at frequency (2πR′CIN)-1, where R′ is the parallel combination of the gain-setting resistors for the inverting or
noninverting amplifier configuration (Figure 5). If the pole
frequency is less than or comparable to the unity-gain
bandwidth (10MHz), the phase margin is reduced, and
the amplifier exhibits degraded AC performance through
either ringing in the step response or sustained oscillations. The pole frequency is 10MHz when R′ = 2kΩ. To
maximize stability, R′ 2kΩ, connect small
capacitor Cf between the inverting input and output.
Choose Cf as follows:
Cf = 8(R/Rf) [pf]
where Rf is the feedback resistor and R is the gain-setting
resistor (Figure 5).
20mV/div
Driving Capacitive Loads
The MAX4230–MAX4234 have a high tolerance for
capacitive loads. They are stable with capacitive loads up
to 780pF. Figure 6 is a graph of the stable operating region
for various capacitive loads vs. resistive loads. Figures 7
and 8 show the transient response with excessive capacitive loads (1500pF), with and without the addition of an
isolation resistor in series with the output. Figure 9 shows
a typical noninverting capacitive-load-driving circuit in the
unity-gain configuration.
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20mV/div
VDD = 3.0V, CL = 1500pF
RL = 100kΩ, RISO = 39Ω
1µ/div
Figure 8. Small-Signal Transient Response with Excessive
Capacitive Load with Isolation Resistor
Maxim Integrated │ 11
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
SHDN
2V/div
IDD
1mA/div
RISO
CL
OUT
2V/div
100µs/div
Figure 9. Capacitive-Load-Driving Circuit
1V/div
Figure 11. Shutdown Enable/Disable Supply Current
VDD
2V/div
IDD
1mA/div
1V/div
4µs/div
40µs/div
Figure 10. Shutdown Output Voltage Enable/Disable
Figure 12. Power-Up/Down Supply Current
The resistor improves the circuit’s phase margin by isolating the load capacitor from the op amp’s output.
Selector Guide
Power-Up and Shutdown Modes
The MAX4231/MAX4233 have a shutdown option. When
the shutdown pin (SHDN) is pulled low, supply current
drops to 0.5μA per amplifier (VDD = 2.7V), the amplifiers
are disabled, and their outputs are driven to VSS. Since
the outputs are actively driven to VSS in shutdown, any
pullup resistor on the output causes a current drain from
the supply. Pulling SHDN high enables the amplifier. In
the dual MAX4233, the two amplifiers shut down independently. Figure 10 shows the MAX4231’s output voltage
to a shutdown pulse. The MAX4231–MAX4234 typically
settle within 5μs after power-up. Figures 11 and 12 show
IDD to a shutdown plus and voltage power-up cycle.
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PART
AMPS PER
PACKAGE
SHUTDOWN
MODE
MAX4230
Single
—
MAX4231
Single
Yes
MAX4232
Dual
—
MAX4233
Dual
Yes
MAX4234
Quad
—
When exiting shutdown, there is a 6μs delay before the
amplifier’s output becomes active (Figure 10).
Maxim Integrated │ 12
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Pin/Bump Configurations
TOP VIEW
IN+ 1
VSS 2
+
5
VDD
IN+ 1
+
6
VDD
VSS 2
5
SHDN
IN- 3
4
OUT
MAX4231
IN- 3
4
OUT
SC70/SOT23
1
IN1- 2
IN1+ 3
10 VDD
MAX4233
VSS 4
A
9 OUT2
VSS
6
5
4
OUT1 1
2
OUT
1
2
3
8 VDD
3
1
IN+
VSS
IN-
A
VDD
2
OUT2
3
IN2-
MAX4232
IN2+
MAX4231
VDD
MAX4233
4
SHDN2
OUT1 1
+
14 OUT4
13 IN4-
IN1- 2
VSS
VDD 4
12 IN4+
MAX4234
IN+
IN-
SHDN
C
UCSP
Power Supplies and Layout
The MAX4230–MAX4234 can operate from a single
2.7V to 5.5V supply, or from dual ±1.35V to ±2.5V
supplies. or single-supply operation, bypass the power
supply with a 0.1μF ceramic capacitor. For dual-supply
operation, bypass each supply to ground. 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’ pins, minimizing trace and lead lengths.
OUT1
IN1-
IN1+
SHDN1
9 IN3-
IN2- 6
8 OUT3
OUT2 7
UCSP
11 VSS
10 IN3+
IN2+ 5
B
6 IN2-
SOT23/MAX
IN1+ 3
B
7 OUT2
5 IN2+
VSS 4
6 SHDN2
MAX
+
IN1+ 3
Thin µDFN
(Ultra-Thin LGA)
8 IN27 IN2+
SHDN1 5
OUT
MAX4231
+
SOT23/SC70
OUT1 1
SHDN
IN1- 2
MAX4230
+
VDD
TSSOP/SO
Ordering Information (continued)
PART
TEMP
RANGE
PINPACKAGE
TOP
MARK
MAX4232AKA+T
-40°C to +125°C 8 SOT23
AAKW
MAX4232AKA/V+T
-40°C to +125°C 8 SOT23
AEQW
MAX4232AUA+T
-40°C to +125°C 8 μMAX
—
MAX4233AUB+T
-40°C to +125°C 10 μMAX
—
MAX4233ABC+T
-40°C to +125°C 10 UCSP
ABF
MAX4234AUD
-40°C to +125°C 14 TSSOP
—
MAX4234AUD/V+T
-40°C to +125°C 14 TSSOP
+YWD
MAX4234ASD
-40°C to +125°C 14 SO
—
+Denotes a lead-free(Pb)/RoHS-compliant package.
T = Tape and reel.
/V denotes an automotive-qualified part.
*EP = Exposed pad.
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Maxim Integrated │ 13
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
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
DOCUMENT NO.
LAND PATTERN NO.
5 SC70
X5+1
21-0076
90-0188
6 SC70
X6SN+1
21-0077
90-0189
5 SOT23
U5+1
21-0057
90-0174
6 SOT23
U6SN+1
21-0058
90-0175
8 μMAX
U8+1
21-0036
90-0092
8 SOT23
K8+5
21-0078
90-0176
10 μMAX
U10+2
21-0061
90-0330
10 UCSP
B12+4
21-0104
—
6 UCSP
R61A1+1
21-0228
—
6 Thin μDFN
(Ultra-Thin LGA)
Y61A1+1
21-0190
90-0233
14 TSSOP
U14+1
21-0066
90-0113
14 SO
S14+1
21-0041
90-0112
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Maxim Integrated │ 14
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
7
7/08
Added 6-pin μDFN package for the MAX4231
8
10/08
Corrected top mark for MAX4321, 6 SOT23 package; changed MAX4320 and 4321
to lead-free packages
9
10/08
Added shutdown pin limits
10
12/08
Added automotive part number
11
9/09
Corrected top mark designation and pin configuration, and added UCSP package
12
1/10
Updated Absolute Maximum Ratings section
2
13
1/11
Added 10 μMAX to Package Information section
14
14
10/11
Updated Electrical Characteristics table with specs for bias current at various
temperatures
1–4
15
3/12
Updated thermal data in the Absolute Maximum Ratings
2
16
6/12
Added automotive part number for MAX4230
1
17
12/13
Updated tENABLE specification in the AC Electrical Characteristics
6
18
10/14
Corrected µDFN references and added ultra-thin LGA reference to Ordering
Information, Pin Configurations, and Package Information
19
1/15
Updated General Description, Applications, and Benefits and Features sections
1
20
11/16
Updated TOC22 in Typical Operating Characteristics section
7
21
2/18
Updated Benefits and Features section and Ordering Information table
22
7/20
Updated DC Electrical Characteristics table
2
23
5/21
Updated Ordering Information table
13
DESCRIPTION
1, 2, 8, 13
1
3, 4
13
1, 2, 8, 13
1, 13, 14
1, 13
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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.
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