MAX4234ASD+T - Maxim Integrated

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 Buffers

● 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

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 20; 11/16

+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

RISO

CLOAD

ILOAD = 30mA

ANTENNA

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 Offset Voltage VOS 0.85 ±6 mV

Input Bias Current (Note 4) IBVCM = VSS to VDD 1 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 VSHDN = 0V (Note 3) 10 Ω

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

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

│

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 Offset Voltage VOS ±8 mV

Offset-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

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

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

│

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

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

www.maximintegrated.com Maxim Integrated

│

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)

-30

-20

-10

-180

PHASE (°)

120

-150

-120

-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)

-30

-20

-10

-180

PHASE (°)

120

-150

-120

-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)

-100

-90

-80

-70

-60

-50

-40

-10

-20

-30

AV = 1V/V

1000

100

0.1

0.01

1k 100k 1M10k 10M

OUTPUT IMPEDANCE vs. FREQUENCY

MAX4230 toc04

FREQUENCY (Hz)

OUTPUT IMPEDANCE (Ω)

AV = 1V/V

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)

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

│

www.maximintegrated.com

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.)

0.6

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

VOS (mV)

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

VDD = 5.0V

VDD = 2.7V

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

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 = 200Ω

VDD = 2.7V

RL = 200Ω

-2.0

-1.0

-1.5

-0.5

0.5

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

0.40

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 (%)

0.0001

4.0 4.2 4.6 5.0

0.001

0.1

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

│

www.maximintegrated.com

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)

50mV/div

MAX4230/34 toc16

OUT

400ns/div

SMALL-SIGNAL TRANSIENT

RESPONSE (INVERTING)

50mV/div

MAX4230/34 toc17

OUT

400ns/div

LARGE-SIGNAL TRANSIENT

RESPONSE (NONINVERTING)

1V/div

MAX4230/34 toc18

OUT

400ns/div

LARGE-SIGNAL TRANSIENT

RESPONSE (INVERTING)

1V/div

MAX4230/34 toc19

OUT

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 0.4 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

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 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

100 10k 100k

FREQUENCY (Hz)

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

│

www.maximintegrated.com

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.

BUMP

NAME

FUNCTION

4230

SOT23/

SC70

4231

SOT23/

SC70/T

µDFN

4232

SOT23/

µM

X4233

µM

4234

TSSOP/SO

X4231

UCSP

4233

UCSP

1 1 — — — B1 —

IN+

Noninverting

Input

2 2 4 4 11 A1 B4

Negative Supply Input.

Connect

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

Positive Supply

Input

— 5 —

6 — B3

C4,

SHDN,

SHDN1

SHDN2

Shutdown Control. Tie to high

for

normal

operation.

— — 3 3 3 — C3

IN1+

Noninverting Input to Amplier

— — 2 2 2 — C2 IN1-

Inverting Input to Amplier

— — 1 1 1 — C1

OUT1

Amplier 1

Output

— — 5 7 5 — A3

IN2+

Noninverting Input to Amplier

— — 6 8 6 — A2 IN2-

Inverting Input to Amplier

— — 7 97 — A1

OUT2

Amplier 2

Output

— — — —

10,

12 — —

IN3+,

N4+

Noninverting Input to Ampliers

— — — —

13 — —

IN3-,

IN4-

Inverting Input to Ampliers 3

and

— — — —

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

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Pin Description

For example, the circuit in Figure 1 has a package power

dissipation of 196mW:

PEAK

DD DC

RMS

PEAK

RMS DC

RMS

RMS (V V ) 2

1.0V

3.6V 1.8V 2.507V

I1.8V 1.0V / 32

II 32

78.4mA

≅−+

= −+ =

Ω

≅+ = +

Ω

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

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

PEAK

RMS DC

RMS

1.0V 0.707V

I1.0V / 32

I I 0A

22.1mA

≅

= =

Ω

≅+ =+

Therefore:

IC(DISS) RMS RMS

P = V I COS

= 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 incom-

ing signal. The -3dB point of the highpass filter is given by

3dB

IN IN

f2R C

−=

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

32Ω

MAX4230

MAX4231

RIGHT

AUDIO INPUT

LEFT

AUDIO INPUT

CIN

CIN RIN

RIN

COUT

VBIAS

HEADPHONE JACK

TO 32Ω STEREO

HEADSET

MAX4230

COUT

MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,

Rail-to-Rail I/O Op Amps with Shutdown in SC70

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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

f2R C

−=

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

1/2

MAX4232

1/2

MAX4232

0.5VP-P

51kΩ

16kΩ

82kΩ

10kΩ

32W

fS = 100Hz

10kΩ

51kΩ

0.1µF

0.1mF

1V/div

OUT

1V/div

5µs/div

VCC = 3.0V

RL = 100kΩ

MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,

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

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

1µ/div

20mV/div

VDD = 3.0V, CL = 1500pF

RL = 100kΩ, RISO = 0Ω

1µ/div

20mV/div

VDD = 3.0V, CL = 1500pF

RL = 100kΩ, RISO = 39Ω

MAX4230

VIN

VOUT

R’ = R || Rf

RfCf = RCIN

INVERTING

MAX4230

VIN

VOUT

R’ = R || Rf

RfCf = RCIN

NONINVERTING

MAX4230–MAX4234 High-Output-Drive, 10MHz, 10V/μs,

Rail-to-Rail I/O Op Amps with Shutdown in SC70

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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

100µs/div

SHDN

2V/div

IDD

1mA/div

OUT

2V/div

4µs/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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│

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 capaci-

tance 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

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+ -40°C to +125°C 14 TSSOP +YWD

MAX4234ASD -40°C to +125°C 14 SO —

TOP VIEW

IN2-

IN2+

VSS

VDD

OUT2

IN1-

IN1+

OUT1

SOT23/MAX

MAX4232

VDD

OUT2

IN2-

IN2+VSS

IN1+

IN1-

OUT1

MAX4233

MAX

SHDN2SHDN1

VSS

OUTIN-

1 6 VDD

IN+

SC70/SOT23

3 4

SHDN

MAX4231

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

OUT1

VDD

OUT2

IN1-

IN2-

IN1+

IN2+

VSS

UCSP

MAX4233

SHDN1

SHDN2

1 2 3 4

IN+

VSS

IN-

OUT VDD

UCSP

MAX4231

1 2 3

456

VDD OUT

IN+ IN-VSS

MAX4231

Thin µDFN

(Ultra-Thin LGA)

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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│

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

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

│

Revision History

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MAX4233AUB+ MAX4233AUB+T MAX4234ASD+ MAX4234ASD+T MAX4234AUD+ MAX4234AUD+T

MAX4230AUK-T MAX4230AXK-T MAX4231AUT-T MAX4231AXT-T MAX4231ART+T