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 the
6-pin SC70 package and a 1.5mm x 1.0mm x 0.5mm
ultra-thin µDFN package. The dual op-amp MAX4233 is
offered in the space-saving 10-bump chip-scale pack-
age (UCSP™), providing the smallest footprint area for
a dual op amp with shutdown.
These op amps are designed to be part of the PA con-
trol 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 dis-
abled when needed, preventing unconverted signals to
the RF antenna.
The MAX4230 family offers low offsets, wide bandwidth,
and high-output drive in a tiny 2.1mm x 2.0mm space-
saving SC70 package. These parts are offered over the
automotive temperature range (-40°C to +125°C).
Applications
RF PA Biasing Controls in Handset Applications
Portable/Battery-Powered Audio Applications
Portable Headphone Speaker Drivers (32Ω)
Audio Hands-Free Car Phones (Kits)
Laptop/Notebook Computers/TFT Panels
Sound Ports/Cards
Set-Top Boxes
Digital-to-Analog Converter Buffers
Transformer/Line Drivers
Motor Drivers
Features
♦30mA Output Drive Capability
♦Rail-to-Rail Input and Output
♦1.1mA Supply Current per Amplifier
♦2.7V to 5.5V Single-Supply Operation
♦10MHz Gain-Bandwidth Product
♦High Slew Rate: 10V/µs
♦100dB Voltage Gain (RL= 100kΩ)
♦85dB Power-Supply Rejection Ratio
♦No Phase Reversal for Overdriven Inputs
♦Unity-Gain Stable for Capacitive Loads to 780pF
♦Low-Power Shutdown Mode Reduces Supply
Current to < 1µA
♦Available in 5-Pin SC70 Package (MAX4230)
and 6-Pin Thin µDFN Package (MAX4231)
♦Available in 10-Bump UCSP Package (MAX4233)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
________________________________________________________________ Maxim Integrated Products 1
19-2164; Rev 7; 7/08
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
M ARK
MAX4230AXK-T
-40°C to +125°C
5 SC70 ACS
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
AAUV
MAX4231AYT+TG65
-40°C to +125°C
6 µDFN +AI
+Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
Typical Operating Circuit
MAX4231
DAC
PA
2.7V TO 5.5V
RISO
ANTENNA
IOUT = 30mA
CLOAD
C
RR
F
SHDN
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
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 (VDD to VSS)....................................................6V
All Other Pins ....................................(VSS - 0.3V) + (VDD + 0.3V)
Output Short-Circuit Duration to VDD or VSS (Note 1) ................10s
Continuous Power Dissipation (TA= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C)..............247mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ...........696mW
6-Pin µDFN (derate 2.1mW/°C above +70°C) .........170.2mW
8-Pin SOT23 (derate 8.9mW/°C above +70°C) ...........714mW
8-Pin µMAX®(derate 4.5mW/°C above +70°C) ..........362mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ..........444mW
10-Bump UCSP (derate 6.1mW/°C above +70°C) .....484mW
10-Pin TDFN (derate 24.4mW°C above +70°C) ........1951mW
14-Pin SO (derate 8.3mW/°C above +70°C) ...............667mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Package power dissipation should also be observed.
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Operating Supply Voltage Range
VDD Inferred from PSRR test 2.7 5.5 V
Input Offset Voltage VOS
0.85
±6mV
Input Bias Current IBVCM = VSS to VDD 50 pA
Input Offset 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 V
SHDN = 0V (Note 3) 10 Ω
Output Voltage in Shutdown
VOUT
SHDN
V
SHDN = 0V, RL = 200Ω (Note 3) 68 120 mV
RL = 100kΩ
100
RL = 2kΩ85 98Large-Signal Voltage Gain AVOL
VSS + 0.20V < VOUT
< VDD - 0.20V
RL = 200Ω74 80
dB
VDD - VOH
400 500
RL = 32ΩVOL - VSS
360
500
VDD - VOH 80 120
RL = 200ΩVOL - VSS 70 120
VDD - VOH 814
Output Voltage Swing VOUT
RL = 2kΩVOL - VSS 714
mV
VDD = 2.7V, VIN = ±100mV 70
Output Source/Sink Current IOUT VDD = 5V, VIN = ±100mV
200
mA
VDD - VOH
128
200
IL = 10mA VDD = 2.7V
VOL - VSS
112
175
VDD - VOH
240
320
Output Voltage
IL = 30mA
VDD = 5V VOL - VSS
224
300
mV
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)
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
_______________________________________________________________________________________ 3
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VDD = 5.5V, VCM = VDD / 2 1.2 2.3
Quiescent Supply Current (per
Amplifier) IDD VDD = 2.7V, VCM = VDD / 2 1.1 2.0 mA
VDD = 5.5V 0.5 1
Shutdown Supply Current (per
Amplifier) (Note 3)
IDD
SHDN
V
S HDN = 0V, RL = ∞VDD = 2.7V 0.1 1 µA
Shutdown mode VSS + 0.3
SHDN Logic Threshold (Note 3)
Normal mode
VDD - 0.3
V
SHDN Input Bias Current VSS < V
S HDN < VDD (Note 3) 50 pA
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage Range VDD Inferred from PSRR test 2.7 5.5 V
Input Offset Voltage VOS ±8mV
Offset-Voltage Tempco ΔVOS /ΔT±3 µV/°C
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
)
V SHDN < 0V, RL = 200Ω (Note 3) 150 mV
RL = 2kΩ76
Large-Signal Voltage Gain AVOL VSS + 0.2V < VDD - 0.2V RL = 200Ω67 dB
VDD - VOH 650
RL = 32Ω, TA = +85°CVOL - VSS 650
VDD - VOH 150
RL = 200ΩVOL - VSS 150
VDD - VOH 20
Output Voltage Swing VOUT
RL = 2kΩVOL - VSS 20
mV
VDD - VOH 250
IL = 10mA VDD = 2.7V VOL - VSS 230
VDD - VOH 400
Output Voltage IL = 30mA,
TA = -40°C
to +85°C
VDD = 5V
VOL - VSS 370
mV
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)
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 oth-
erwise noted.) (Note 2)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
4 _______________________________________________________________________________________
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
f = 1kHz 15
Voltage-Noise Density enf = 10kHz 12
nV/√Hz
Channel-to-Channel Isolation f = 1kHz, RL = 100kΩ125 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) 1 µs
Power-Up Time tON 5µs
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.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VDD = 5.5V, VCM = VDD/2 2.8
Quiescent Supply Current
(per Amplifier) IDD VDD = 2.7V, VCM = VDD/2 2.5 mA
VDD = 5.5V 2.0
Shutdown Supply Current
(per Amplifier) (Note 3)
IDD
(
SHDN
)
V SHDN < 0V, RL = ∞VDD = 2.7V 2.0 µA
DC ELECTRICAL CHARACTERISTICS (continued)
(VDD = 2.7V, VSS = 0V, VCM = VDD/2, VOUT = (VDD/2), RL= ∞connected to (VDD/2), VSHDN = VDD, TA= -40 to +125°C, unless oth-
erwise noted.) (Note 2)
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.)
(Note 2)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
_______________________________________________________________________________________ 5
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 (DEGREES)
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 (DEGREES)
120
-150
-120
-90
-60
-30
0
90
60
30
MAX4230 toc02
AV = 1000V/V
CL = 250pF
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)
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 (Ω)
AV = 1V/V
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
__________________________________________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.)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
6 _______________________________________________________________________________________
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 = 200Ω
VDD = 5.0V
RL = 200Ω
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 = 2.7V
RL = 200Ω
VDD = 5.0V
RL = 200Ω
0.2
0.8
0.6
0.4
1.0
1.2
1.4
02.01.50.5 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
-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
0.45
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 = 32Ω
VOUT = 2VP-P
500kHz LOWPASS FILTER
RL = 10kΩ
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 = 2kΩ
RL = 250Ω
RL = 25Ω
RL = 100kΩ
f = 10kHz
VDD = 5V
____________________________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.)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
_______________________________________________________________________________________ 7
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
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
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)
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)
INPUT VOLTAGE NOISE (nV/√Hz)
1k
INPUT VOLTAGE NOISE
vs. FREQUENCY
MAX4230/34 toc24
____________________________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.)
MAX4230–MAX4234
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 typi-
cally greater than (VSS + 1.2V), and the p-channel
stage is active for common-mode input voltages typi-
cally 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-dissi-
pation rating. As a general rule, as long as the peak cur-
rent 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 fol-
lowing equations. The equation below gives an approxi-
mation of the package power dissipation:
where:
VRMS = RMS voltage from VDD to VOUT when sourcing
current and RMS voltage from VOUT to VSS when sink-
ing current.
IRMS = RMS current flowing out of or into the op amp
and the load.
θ= phase difference between the voltage and the cur-
rent. For resistive loads, COS θ= 1.
P V I COS
IC DISS RMS RMS
()
≅θ
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
8 _______________________________________________________________________________________
PIN
M AX42 30
SOT 23 /
SC7 0
M AX42 31
SOT 23 /
SC7 0/µD FN
M AX42 32
SOT 23 /
µ M A X
M A X4 2 3 3
µ M A X/
T D FN
M AX42 33
U CSP
M AX42 34 T
SSO P/
SO
NAME FUNCTION
1 1 — — — — IN+ Noninverting Input
2 2 4 4 B4 11 VSS Negative Supply Input. Connect to
ground for single-supply operation.
3 3 — — — — IN- Inverting Input
4 4 — — — — OUT Amplifier Output
56 810B14V
DD Positive Supply Input
— 5 — 5, 6 C4, A4 —
SHDN,
SHDN1,
SHDN2
Shutdown Control. Tie to high for normal
operation.
— — 3 3 C3 3 IN1+ Noninverting Input to Amplifier 1
— — 2 2 C2 2 IN1- Inverting Input to Amplifier 1
— — 1 1 C1 1 OUT1 Amplifier 1 Output
— — 5 7 A3 5 IN2+ Noninverting Input to Amplifier 2
— — 6 8 A2 6 IN2- Inverting Input to Amplifier 2
— — 7 9 A1 7 OUT2 Amplifier 2 Output
— — — — — 10, 12
IN3+, IN4+
Noninverting Input to Amplifiers 3 and 4
— — — — — 9, 13
IN3-, IN4-
Inverting Input to Amplifiers 3 and 4
— — — — — 8, 14 OUT3,
OUT4 Amplifiers 3 and 4 Outputs
Pin Description
For example, the circuit in Figure 1 has a package
power dissipation of 196mW:
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 com-
ponent of the output voltage.
IPEAK = the highest positive excursion of the AC com-
ponent 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:
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-sup-
ply, stereo headphone driver. The circuit shown in
Figure 2 can deliver 60mW per channel with 1% distor-
tion 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:
fRC
dB IN IN
−=
3
1
2π
V
I +
I
2
RMS
RMS PEAK
≅
==
≅=+
=
. .
./
.
V
VV
IA
V
mA
PEAK
RMS
DC
RMS
2
10
2
0 707
010 32
2
22 1
Ω
RMS DD DC
RMS PEAK
V V
I +
I
2
≅−
()
+
=−+=
≅=+
=
. . . .
. ./
.
V
VV
VV
IVV
mA
PEAK
RMS
DC
RMS
2
36 18 10
2
2 507
18
32
10 32
2
78 4
Ω
Ω
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
_______________________________________________________________________________________ 9
RIGHT
AUDIO INPUT
LEFT
AUDIO INPUT
CIN
CIN RIN
RIN
RF
COUT
VBIAS
COUT
HEADPHONE JACK
TO 32Ω STEREO
HEADSET
RF
MAX4230
Figure 2. Circuit Example: Adding a Coupling Capacitor
Greatly Reduces Power Dissipation of its Package
3.6V
VIN = 2VP-P
R
C
32Ω
R
MAX4230
MAX4231
Figure 1. MAX4230/MAX4231 Used in Single-Supply Operation
Circuit Example
MAX4230–MAX4234
Choose gain-setting resistors RIN and RFaccording to
the amount of desired gain, keeping in mind the maxi-
mum output amplitude. The output coupling capacitor,
COUT, blocks the DC component of the amplifier out-
put, preventing DC current flowing to the load. The out-
put capacitor and the load impedance form a highpass
filer with the -3dB point determined by:
For a 32Ωload, a 100µF aluminum electrolytic capaci-
tor 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
size-constrained applications. This configuration elimi-
nates the need for the large coupling capacitor
required by the single op-amp speaker driver when sin-
gle-supply operation is necessary. Voltage gain is set
to 10V/V; however, it can be changed by adjusting the
82kΩresistor 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 extend-
ing 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 sin-
gle-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 (32Ωto 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 combi-
nation 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′<< 2kΩis recommended.
fRC
dB L OUT
−=
3
1
2π
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
10 ______________________________________________________________________________________
Figure 4. Rail-to-Rail Input/Output RangeFigure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW
at 3V
1
6
7
5
28
3V
3V
34
MAX4232
1/2
MAX4232
1/2
0.5VP-P
R5
51kΩ
R1
16kΩ
R2
82kΩ
R4
10kΩ
32Ω
fs = 100Hz
R3
10kΩ
R6
51kΩ
C2
0.1μF
C1
0.1μF
IN
1V/div
OUT
1V/div
5μs/div
VCC = 3.0V
RL = 100kΩ
To improve step response when R′> 2kΩ, connect
small capacitor Cfbetween the inverting input and out-
put. Choose Cfas follows:
Cf= 8(R / Rf) [pf]
where Rfis the feedback resistor and R is the gain-set-
ting 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 capacitive loads (1500pF), with and without
the addition of an isolation resistor in series with the
output. Figure 9 shows a typical noninverting capaci-
tive-load-driving circuit in the unity-gain configuration.
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
______________________________________________________________________________________ 11
MAX4230
VIN
VOUT
R′ = R || Rf
RfCf = RCIN
Rf
Cf
R
INVERTING
MAX4230
VIN
VOUT
R′ = R || Rf
RfCf = RCIN
Rf
R
Cf
NONINVERTING
Figure 5. Inverting and Noninverting Amplifiers with Feedback
Compensation
0
500
1500
1000
2000
2500
1 10010 1k 10k 100k
RESISTIVE LOAD (Ω)
CAPACITIVE LOAD (pF)
VDD = 5.0V
RL TO VDD/2
STABLE
UNSTABLE
Figure 6. Capacitive-Load Stability
1μs/div
20mV/div
20mV/div
VDD = 3.0V, CL = 1500pF
RL = 100kΩ, RISO = 39Ω
Figure 8. Small-Signal Transient Response with Excessive
Capacitive Load with Isolation Resistor
1μs/div
20mV/div
20mV/div
VDD = 3.0V, CL = 1500pF
RL = 100kΩ, RISO = 0Ω
Figure 7. Small-Signal Transient Response with Excessive
Capacitive Load
MAX4230–MAX4234
The resistor improves the circuit’s phase margin by iso-
lating 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 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.
When exiting shutdown, there is a 6µs delay before the
amplifier’s output becomes active (Figure 10).
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
12 ______________________________________________________________________________________
RISO
CL
Figure 9. Capacitive-Load-Driving Circuit
100μs/div
SHDN
2V/div
IDD
1mA/div
OUT
2V/div
Figure 11. Shutdown Enable/Disable Supply Current
40μs/div
VDD
2V/div
IDD
1mA/div
Figure 12. Power-Up/Down Supply Current
4μs/div
1V/div
1V/div
Figure 10. Shutdown Output Voltage Enable/Disable
Selector Guide
AMPS PER
PACKAGE
SHUTDOWN
MODE
MAX4230 Single —
MAX4231 Single Yes
PART
MAX4232 Dual —
MAX4233 Dual Yes
MAX4234 Quad —
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
______________________________________________________________________________________ 13
Pin Configurations
TOP VIEW
IN2-
IN2+
VSS
1
2
8
7
VDD
OUT2
IN1-
IN1+
OUT1
SOT23/μMAX
3
4
6
5
MAX4232
1
2
3
4
5
10
9
8
7
6
VDD
OUT2
IN2-
IN2+VSS
IN1+
IN1-
OUT1
MAX4233
μMAX
SHDN2SHDN1
VSS
OUTIN-
16V
DD
5
IN+
SC70/SOT23
2
34
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
SHDN1
SHDN2
UCSP
MAX4233
VSS
VDD
OUT1
IN1-
IN1+
OUT2
IN2-
IN2+
SHDN2
TDFN
TDFN EXPOSED PAD CONNECTED TO VSS
MAX4233
SHDN1
123 45
67
8
9
10
12 3 4
A
B
C
123
654
VDD OUTSHDN
IN+ IN-VSS
MAX4231
μDFN
+
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 sup-
plies. For 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 com-
ponents close to the op amps’ pins, minimizing trace
and lead lengths.
Ordering Information (continued)
PART
TEMP RANGE
PIN-
PACKAGE
TOP
M ARK
MAX4232AKA+T
-40°C to +125°C
8 SOT23-8
AAKW
MAX4232AUA+T
-40°C to +125°C
8 µMAX-8 —
MAX4233AUB+T
-40°C to +125°C 10 µMAX-10
—
MAX4233ABC+T
-40°C to +125°C 10 UCSP-10
ABE
MAX4233ATB+T
-40°C to +125°C 10 TDFN-EP*
+AQH
MAX4234AUD
-40°C to +125°C
14 TSSOP —
MAX4234ASD
-40°C to +125°C
14 SO —
Chip Information
MAX4230 TRANSISTOR COUNT: 230
MAX4231 TRANSISTOR COUNT: 230
MAX4232 TRANSISTOR COUNT: 462
MAX4233 TRANSISTOR COUNT: 462
MAX4234 TRANSISTOR COUNT: 924
+Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
14 ______________________________________________________________________________________
SC70, 5L.EPS
PACKAGE OUTLINE, 5L SC70
21-0076
1
1
E
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.)
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
______________________________________________________________________________________ 15
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.)
SC70, 6L.EPS
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
16 ______________________________________________________________________________________
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.)
SOT-23 5L .EPS
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
______________________________________________________________________________________ 17
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.)
6LSOT.EPS
PACKAGE OUTLINE, SOT 6L BODY
21-0058
2
1
I
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
18 ______________________________________________________________________________________
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.)
PACKAGE OUTLINE, SOT 6L BODY
21-0058
2
2
I
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
______________________________________________________________________________________ 19
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.)
8LUMAXD.EPS
α
α
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
20 ______________________________________________________________________________________
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.)
SOT23, 8L.EPS
0
0
MARKING
PACKAGE OUTLINE, SOT-23, 8L BODY
21-0078 H
11
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
______________________________________________________________________________________ 21
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.)
12L, UCSP 4x3.EPS
F
11
21-0104
PACKAGE OUTLINE, 4x3 UCSP
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
22 ______________________________________________________________________________________
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.)
6, 8, &10L, DFN THIN.EPS
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
______________________________________________________________________________________ 23
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.)
COMMON DIMENSIONS
SYMBOL MIN. MAX.
A 0.70 0.80
D 2.90 3.10
E 2.90 3.10
A1 0.00 0.05
L 0.20 0.40
PKG. CODE N D2 E2 eJEDEC SPEC b[(N/2)-1] x e
PACKAGE VARIATIONS
0.25 MIN.k
A2 0.20 REF.
2.00 REF0.25±0.050.50 BSC2.30±0.1010T1033-1
2.40 REF0.20±0.05- - - - 0.40 BSC1.70±0.10 2.30±0.1014T1433-1
1.50±0.10 MO229 / WEED-3
0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10
T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF
T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF
2.30±0.10 MO229 / WEED-3 2.00 REF0.25±0.050.50 BSC1.50±0.1010T1033-2
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
24 ______________________________________________________________________________________
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.)
6L ULTRA THINLGA.EPS
MAX4230–MAX4234
High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
______________________________________________________________________________________ 25
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.)
TABLE 2
TABLE 1
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 DESCRIPTION PAGES
CHANGED
7 7/08 Added 6-pin µDFN package for the MAX4231 1, 2, 8, 13
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 ____________________ 26
© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.