General Description
The MAX4230–MAX4234 single/dual/quad, high-output
drive CMOS op amps feature 200mA of peak output cur-
rent, 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 Bu󰀨ers
Transformer/Line Drivers
Motor Drivers
Benets 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 Amplier
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, Refer to Ordering Information
for the List of /V Parts
Selector Guide appears at end of data sheet.
Pin/Bump Configurations appear at end of data sheet.
Ordering Information continued at end of data sheet.
Visit www.maximintegrated.com/products/patents for product
patent marking information.
UCSP is a trademark of Maxim Integrated Products, Inc.
19-2164; Rev 21; 2/18
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PART TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
MAX4230AXK+T -40°C to +125°C 5 SC70 ACS
MAX4230AXK/V+T -40°C to +125°C 5 SC70 +AUU
MAX4230AUK+T -40°C to +125°C 5 SOT23 ABZZ
MAX4231AXT+T -40°C to +125°C 6 SC70 ABA
MAX4231AUT+T -40°C to +125°C 6 SOT23 ABNF
MAX4231ART+T -40°C to +125°C 6 UCSP AAM
MAX4231AYT+T -40°C to +125°C 6 Thin µDFN
(Ultra-Thin LGA) +AH
MAX4231
DAC
SHDN
C
RF
RISO
CLOAD
ILOAD = 30mA
ANTENNA
R
PA
2.7V TO 5.5V
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Typical Operating Circuit
Ordering Information
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
(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)
μMAX is a registered trademark of Maxim Integrated Products, Inc.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage
Range VDD Inferred from PSRR test 2.7 5.5 V
Input O󰀨set Voltage VOS 0.85 ±6 mV
Input Bias Current (Note 4) IBVCM = VSS to VDD 1 pA
Input O󰀨set Current IOS VCM = VSS to VDD 50 pA
Input Resistance RIN 1000 MΩ
Common-Mode Input
Voltage Range VCM Inferred from CMRR test 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
Output Voltage in Shutdown VOUT(SHDN)VSHDN = 0V, RL = 200Ω (Note 3) 68 mV
Large-Signal Voltage Gain AVOL
VSS + 0.20V <
VOUT < VDD -
0.20V
RL = 100kΩ 100
dBRL = 2kΩ 85 98
RL = 200Ω 74 80
Output Voltage Swing VOUT
RL = 32Ω VDD - VOH 400 500
mV
VOL - VSS 360 500
RL = 200Ω VDD - VOH 80 120
VOL - VSS 70 120
RL = 2kΩ VDD - VOH 8 14
VOL - VSS 7 14
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
www.maximintegrated.com Maxim Integrated
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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.
DC Electrical Characteristics
Note 1: Package power dissipation should also be observed.
(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)
(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 MIN TYP MAX UNITS
Operating Supply Voltage
Range VDD Inferred from PSRR test 2.7 5.5 V
Input O󰀨set Voltage VOS ±8 mV
O󰀨set-Voltage Tempco ∆VOS/∆T ±3 µV/°C
Input Bias Current
(Note 4) IB
TA = -40°C to +85°C 17 pA
TA = -40°C to +125°C 550
Common-Mode Input Voltage
Range VCM Inferred from CMRR test VSS VDD V
Common-Mode Rejection
Ratio CMRR VSS < VCM < VDD 46 dB
Power-Supply Rejection Ratio PSRR VDD = 2.7V to 5.5V 70 dB
Output Voltage in Shutdown VOUT(SHDN)VSHDN = 0V, RL = 200Ω (Note 3) 150 mV
Large-Signal Voltage Gain AVOL VSS + 0.20V
< VDD - 0.20V
RL = 2kΩ 76 dB
RL = 200Ω 67
Output Voltage Swing VOUT
RL = 32Ω
TA = +85°C
VDD - VOH 650
mV
VOL - VSS 650
RL = 200Ω VDD - VOH 150
VOL - VSS 150
RL = 2kΩ VDD - VOH 20
VOL - VSS 20
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Source/Sink
Current IOUT
VDD = 2.7V, VIN = ±100mV 70 mA
VDD = 5V, VIN = ±100mV 200
Output Voltage
IL = 10mA VDD =
2.7V
VDD - VOH 128 200
mV
VOL - VSS 112 175
IL = 30mA VDD = 5V VDD - VOH 240 320
VOL - VSS 224 300
Quiescent Supply Current
(per Amplier) IDD
VDD = 5.5V, VCM = VDD/2 1.2 2.3 mA
VDD = 2.7V, VCM = VDD/2 1.1 2.0
Shutdown Supply Current
(per Amplier) (Note 3) IDD(SHDN)VSHDN = 0V,
RL = ∞
VDD = 5.5V 0.5 1 µA
VDD = 2.7V 0.1 1
SHDN Logic Threshold
(Note 3)
VIL Shutdown mode 0.8 V
VIH Normal mode VDD x 0.57
SHDN Input Bias Current VSS < VSHDN < VDD (Note 3) 50 pA
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
www.maximintegrated.com Maxim Integrated
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DC Electrical Characteristics (continued)
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)
(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)
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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Voltage
IL = 10mA VDD =
2.7V
VDD - VOH 250
mV
VOL - VSS 230
IL = 30mA
TA = -40°C
to +85°
VDD = 5V
VDD - VOH 400
VOL - VSS 370
Quiescent Supply Current
(per Amplier) IDD
VDD = 5.5V, VCM = VDD/2 2.8 mA
VDD = 2.7V, VCM = VDD/2 2.5
Shutdown Supply Current
(per Amplier) (Note 3) IDD(SHDN)VSHDN < 0V, RL = ∞ VDD = 5.5V 2.0 µA
VDD = 2.7V 2.0
SHDN Logic Threshold
(Note 3)
VIL Shutdown mode 0.8 V
VIH Normal mode VDD x 0.61
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
Total Harmonic Distortion
Plus Noise THD+N f = 10kHz, VOUT = 2VP-P,
AVCL = 1V/V 0.0005 %
Input Capacitance CIN 8pF
Voltage-Noise Density en
f = 1kHz 15 nV/√Hz
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 tSHDN (Note 3) 1 µs
Enable Time from
Shutdown tENABLE (Note 3) 6 µs
Power-Up Time tON 5 µs
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
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4
DC Electrical Characteristics
AC 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.)
GAIN AND PHASE vs. FREQUENCY
FREQUENCY (Hz)
0.01k 10k 100k 1M 10M0.1k 1k 100M
GAIN (dB)
70
-30
-20
-10
0
10
20
30
60
50
40
-180
PHASE (°)
120
-150
-120
-90
-60
-30
0
90
60
30
MAX4230 toc01
AV = 1000V/V
GAIN AND PHASE vs. FREQUENCY
(CL = 250pF)
FREQUENCY (Hz)
0.01k 10k 100k 1M 10M0.1k 1k 100M
GAIN (dB)
70
-30
-20
-10
0
10
20
30
60
50
40
-180
PHASE (°)
120
-150
-120
-90
-60
-30
0
90
60
30
MAX4230 toc02
AV = 1000V/V
CL = 250pF
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
FREQUENCY (Hz)
0.01k 10k 100k 1M0.1k 1k 10M
MAX4230 toc03
PSRR (dB)
0
-100
-90
-80
-70
-60
-50
-40
-10
-20
-30
AV = 1V/V
1000
100
10
1
0.1
0.01
1k 100k 1M10k 10M
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4230 toc04
FREQUENCY (Hz)
OUTPUT IMPEDANCE (
)
AV = 1V/V
0
0.4
0.2
0.8
0.6
1.2
1.0
1.4
1.8
1.6
2.0
-40 0 20 40-20 60 80 100 120
SUPPLY CURRENT vs. TEMPERATURE
MAX4230 toc05
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
50
60
70
80
90
100
110
-40 0-20 20 40 60 80 100 120
MAX4230 toc06
TEMPERATURE (C)
SUPPLY CURRENT (nA)
SUPPLY CURRENT vs. TEMPERATURE
(SHDN = LOW)
SHDN = VSS
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Maxim Integrated
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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.)
0
0.6
0.4
0.2
1.0
0.8
1.8
1.6
1.4
1.2
2.0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
MAX4230 toc07
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
-40 0-20 20 40 60 80 100 120
MAX4230 toc08
TEMPERATURE (°C)
-2
-1
0
1
2
VOS (mV)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
VDD = 5.0V
VDD = 2.7V
0
20
40
60
80
100
-40 0-20 20 40 60 80 100 120
OUTPUT SWING HIGH
vs. TEMPERATURE
MAX4230/34 toc09
TEMPERATURE (°C)
VDD - VOUT (mV)
VDD = 2.7V
RL = 200
VDD = 5.0V
RL = 200
0
40
20
80
60
120
100
140
-40 0 20-20 40 60 80 100 120
OUTPUT SWING LOW
vs. TEMPERATURE
MAX4230/3 toc10
TEMPERATURE (°C)
VOUT - VSS (mV)
VDD = 5.0V
RL = 200
VDD = 2.7V
RL = 200
-2.0
-1.0
-1.5
-0.5
0.5
0
1.0
0 0.5 1.0 1.5 2.0 2.5
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX4230/3 toc11
COMMON-MODE VOLTAGE (V)
INPUT OFFSET VOLTAGE (mV)
0.2
0.6
0.4
1.0
0.8
1.2
0 0.5 1.0 1.5 2.0 2.5
SUPPLY CURRENT PER AMPLIFIER
vs. COMMON-MODE VOLTAGE
MAX4230/3 toc12
COMMON-MODE VOLTAGE (V)
SUPPLY CURRENT (mA)
VDD = 2.7V
0.2
0.8
0.6
0.4
1.0
1.2
1.4
0 2.01.50.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0
SUPPLY CURRENT PER AMPLIFIER
vs. COMMON-MODE VOLTAGE
MAX4230/34 toc13
COMMON-MODE VOLTAGE (V)
SUPPLY CURRENT (mA)
VDD = 5.0V
0.45
10 100 1k 10k 100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.05
MAX4230/34 toc14
FREQUENCY (Hz)
THD+N (%)
0.15
0.25
0.35
0.30
0.20
0.10
0
0.40
RL = 32
VOUT = 2VP-P
500kHz LOWPASS FILTER
RL = 10k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. PEAK-TO-PEAK OUTPUT VOLTAGE
MAX4230/34 toc15
PEAK-TO-PEAK OUTPUT VOLTAGE (V)
THD+N (%)
10
0.0001
4.0 4.2 4.6 5.0
0.001
0.1
1
4.4 4.8
RL = 250
RL = 25
RL = 100k
f = 10kHz
VDD = 5V
RL = 2k
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Maxim Integrated
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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.)
400ns/div
SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
IN
50mV/div
MAX4230/34 toc16
OUT
400ns/div
SMALL-SIGNAL TRANSIENT
RESPONSE (INVERTING)
IN
50mV/div
MAX4230/34 toc17
OUT
400ns/div
LARGE-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
IN
1V/div
MAX4230/34 toc18
OUT
400ns/div
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
IN
1V/div
MAX4230/34 toc19
OUT
0
20
10
30
60
70
50
40
80
1.0 1.4 1.6 1.8 2.01.2 2.2 2.4 2.6 2.8 3.0
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SOURCING, VDD = 2.7V)
MAX4230/34 toc20
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
VDIFF = 100mV
-80
-60
-70
-40
-50
-30
-20
-10
0
0 0.4 0.60.2 0.8 1.0 1.2 1.4 1.6
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SINKING, VDD = 2.7V)
MAX4230/34 toc21
OUTPUT VOLTAGE (V)
VDIFF = 100mV
0
50
150
100
200
250
2.0 3.02.5 3.5 4.0 4.5 5.0
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SOURCING, VDD = 5.0V)
MAX4230/34 toc22
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
VDIFF = 100mV
-250
-200
-100
-150
-50
0
0 1.00.5 1.5 2.0 2.5 3.0
OUTPUT CURRENT vs. OUTPUT VOLTAGE
(SINKING, VDD = 5.0V)
MAX4230/34 toc23
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
VDIFF = 100mV
200
100
10
100 10k 100k
FREQUENCY (Hz)
1k
INPUT VOLTAGE NOISE
vs. FREQUENCY
INPUT VOLTAGE NOISE (nV/
Hz)
MAX4230/34 toc24
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
Maxim Integrated
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Typical Operating Characteristics (continued)
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 power-
dissipation rating. As a general rule, as long as the
peak current is less than or equal to 40mA, the maximum
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:
IC(DISS) RMS RMS
P V I COS≅θ
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.
PIN
BUMP
NAME
FUNCTION
M
AX
4230
SOT23/
SC70
M
AX
4231
SOT23/
SC70/T
h
in
µDFN
M
AX
4232
SOT23/
µM
A
X
M
A
X4233
µM
A
X
M
AX
4234
TSSOP/SO
M
A
X4231
UCSP
M
AX
4233
UCSP
1 1 B1
IN+
Noninverting
Input
2 2 4 4 11 A1 B4
V
SS
Negative Supply Input.
Connect
to
ground for
single-
supply operation.
3 3 B2 IN-
Inverting
Input
4 4 A2
OUT
Amplier
Output
5 6 8 10 4 A3 B1
V
DD
Positive Supply
Input
5
5,
6 B3
C4,
A4
SHDN,
SHDN1
,
SHDN2
Shutdown Control. Tie to high
for
normal
operation.
3 3 3 C3
IN1+
Noninverting Input to Amplier
1
2 2 2 C2 IN1-
Inverting Input to Amplier
1
1 1 1 C1
OUT1
Amplier 1
Output
5 7 5 A3
IN2+
Noninverting Input to Amplier
2
6 8 6 A2 IN2-
Inverting Input to Amplier
2
7 97 A1
OUT2
Amplier 2
Output
10,
12
IN3+,
N4+
Noninverting Input to Ampliers
3
9,
13
IN3-,
IN4-
Inverting Input to Ampliers 3
and
8,
14
OUT3,
OUT4
Ampliers 3 and 4
Outputs
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
www.maximintegrated.com Maxim Integrated
8
Pin Description
For example, the circuit in Figure 1 has a package power
dissipation of 196mW:
PEAK
DD DC
RMS
PEAK
RMS DC
RMS
V
RMS (V V ) 2
1.0V
3.6V 1.8V 2.507V
2
I1.8V 1.0V / 32
II 32
22
78.4mA
−+
= −+ =
≅+ = +
=
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 compo-
nent of the output voltage.
IPEAK = the highest positive excursion of the AC compo-
nent of the output current.
Therefore:
IC(DISS) RMS RMS
P = V I COS
= 196mW
θ
Adding a coupling capacitor improves the package power
dissipation because there is no DC current to the load, as
shown in Figure 2:
PEAK
RMS
RMS
PEAK
RMS DC
RMS
V
V2
1.0V 0.707V
2
I1.0V / 32
I I 0A
22
22.1mA
= =
≅+ =+
=
Therefore:
IC(DISS) RMS RMS
P = V I COS
= 15.6mW
θ
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 incom-
ing signal. The -3dB point of the highpass filter is given by
3dB
IN IN
1
f2R C
=
π
Figure 1. MAX4230/MAX4231 Used in Single-Supply Operation
Circuit Example
Figure 2. Circuit Example: Adding a Coupling Capacitor Greatly
Reduces Power Dissipation of its Package
3.6V
VIN = 2VP-P
R
C
32
R
MAX4230
MAX4231
RIGHT
AUDIO INPUT
LEFT
AUDIO INPUT
CIN
CIN RIN
RIN
RF
COUT
VBIAS
HEADPHONE JACK
TO 32 STEREO
HEADSET
RF
MAX4230
COUT
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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, prevent-
ing DC current flowing to the load. The output capacitor
and the load impedance form a highpass filer with the
-3dB point determined by:
3dB IN OUT
1
f2R C
=
π
For a 32Ω load, a 100μF aluminum electrolytic capacitor
gives a low-frequency pole at 50Hz.
Bridge Amplier
The circuit shown in Figure 3 uses a dual MAX4230 to
implement a 3V, 200mW amplifier suitable for use in size-
constrained applications. This configuration eliminates
the need for the large coupling capacitor required by the
single op-amp speaker driver when single-supply opera-
tion 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 common-
mode input voltages typically less than (VDD -1.2V).
Rail-to-Rail Output Stage
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 maxi-
mum load (32Ω to ground).
Observe the Absolute Maximum Ratings for power dis-
sipation 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 com-
bination 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 oscilla-
tions. The pole frequency is 10MHz when R′ = 2kΩ. To
maximize stability, R′ << 2kΩ is recommended.
Figure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW
at 3V
Figure 4. Rail-to-Rail Input/Output Range
1
6
7
5
28
3V
3V
34
1/2
MAX4232
1/2
MAX4232
0.5VP-P
R5
51k
R1
16k
R2
82k
R4
10k
32W
fS = 100Hz
R3
10k
R6
51k
C2
0.1µF
C1
0.1mF
IN
1V/div
OUT
1V/div
5µs/div
VCC = 3.0V
RL = 100k
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Rail-to-Rail I/O Op Amps with Shutdown in SC70
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To improve step response when 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).
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 capaci-
tive 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.
Figure 6. Capacitive-Load Stability
Figure 7. Small-Signal Transient Response with Excessive
Capacitive Load
Figure 8. Small-Signal Transient Response with Excessive
Capacitive Load with Isolation Resistor
Figure 5. Inverting and Noninverting Amplifiers with Feedback
Compensation
0
500
1500
1000
2000
2500
1 10010 1k 10k 100k
RESISTIVE LOAD ()
CAPACITIVE LOAD (pF)
VDD = 5.0V
RL TO VDD/2
STABLE
UNSTABLE
1µ/div
20mV/div
20mV/div
VDD = 3.0V, CL = 1500pF
RL = 100k, RISO = 0
1µ/div
20mV/div
20mV/div
VDD = 3.0V, CL = 1500pF
RL = 100k, RISO = 39
MAX4230
VIN
VOUT
R’ = R || Rf
RfCf = RCIN
Rf
Cf
R
INVERTING
MAX4230
VIN
VOUT
R’ = R || Rf
RfCf = RCIN
Rf
R
Cf
NONINVERTING
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
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The resistor improves the circuit’s phase margin by isolat-
ing the load capacitor from the op amp’s output.
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 indepen-
dently. 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.
When exiting shutdown, there is a 6μs delay before the
amplifier’s output becomes active (Figure 10).
Figure 9. Capacitive-Load-Driving Circuit Figure 11. Shutdown Enable/Disable Supply Current
Figure 10. Shutdown Output Voltage Enable/Disable Figure 12. Power-Up/Down Supply Current
PART
AMPS PER
PACKAGE
SHUTDOWN
MODE
MAX4230
Single
MAX4231
Single Yes
MAX4232
Dual
MAX4233
Dual Yes
MAX4234
Quad
RISO
CL
100µs/div
SHDN
2V/div
IDD
1mA/div
OUT
2V/div
4µs/div
1V/div
1V/div
40µs/div
VDD
2V/div
IDD
1mA/div
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
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12
Selector Guide
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.
+Denotes a lead-free(Pb)/RoHS-compliant package.
T = Tape and reel.
/V denotes an automotive-qualified part.
*EP = Exposed pad.
PART TEMP
RANGE
PIN-
PACKAGE
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
MAX4234ASD -40°C to +125°C 14 SO
TOP VIEW
IN2-
IN2+
VSS
1
2
8
7
VDD
OUT2
IN1-
IN1+
OUT1
SOT23/MAX
3
4
6
5
MAX4232
1
2
3
4
5
10
9
8
7
6
VDD
OUT2
IN2-
IN2+VSS
IN1+
IN1-
OUT1
MAX4233
MAX
SHDN2SHDN1
VSS
OUTIN-
1 6 VDD
5
IN+
SC70/SOT23
2
3 4
SHDN
MAX4231
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUT4
IN4-
IN4+
VSS
VDD
IN1+
IN1-
OUT1
MAX4234
IN3+
IN3-
OUT3
OUT2
IN2-
IN2+
TSSOP/SO
VSS
OUT
IN-
15VDD
IN+
MAX4230
SOT23/SC70
2
34
OUT1
VDD
OUT2
IN1-
IN2-
IN1+
IN2+
VSS
UCSP
MAX4233
SHDN1
SHDN2
1 2 3 4
A
B
C
IN+
VSS
IN-
OUT VDD
UCSP
MAX4231
1 2 3
A
B
1 2 3
456
VDD OUT
IN+ IN-VSS
MAX4231
Thin µDFN
(Ultra-Thin LGA)
SHDN
+
++
+
+
+
SHDN
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
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Pin/Bump Congurations
Ordering Information (continued)
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
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
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14
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.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
7 7/08 Added 6-pin μDFN package for the MAX4231 1, 2, 8, 13
8 10/08 Corrected top mark for MAX4321, 6 SOT23 package; changed MAX4320 and 4321
to lead-free packages 1
910/08 Added shutdown pin limits 3, 4
10 12/08 Added automotive part number 13
11 9/09 Corrected top mark designation and pin conguration, and added UCSP package 1, 2, 8, 13
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 specication in the AC Electrical Characteristics 6
18 10/14 Corrected µDFN references and added ultra-thin LGA reference to Ordering
Information, Pin Congurations, and Package Information 1, 13, 14
19 1/15 Updated General Description, Applications, and Benets and Features sections 1
20 11/16 Updated TOC22 in Typical Operating Characteristics section 7
21 2/18 Updated Benets and Features section and Ordering Information table 1, 13
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 specications 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.
MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
© 2018 Maxim Integrated Products, Inc.
15
Revision History
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.