MAXIM MAX4230, MAX4234 Technical data

General Description

The MAX4230–MAX4234 single/dual/quad, high-output­drive CMOS op amps feature 200mA of peak output
current, rail-to-rail input, and output capability from a
single 2.7V to 5.5V supply. These amplifiers exhibit a
high slew rate of 10V/µs and a gain-bandwidth product
(GBWP) of 10MHz. The MAX4230–MAX4234 can drive
typical headset levels (32Ω), as well as bias an RF
power amplifier (PA) in wireless handset applications.

The MAX4230 comes in a tiny 5-pin SC70 package and
the MAX4231, single with shutdown, is offered in a
6-pin SC70 package and in 1.5mm x 1.0mm UCSP and
thin µDFN packages. The dual op-amp MAX4233 is
offered in the space-saving 10-bump chip-scale pack­age (UCSP™), providing the smallest footprint area for
a dual op amp with shutdown.

These op amps are designed to be part of the PA con­trol circuitry, biasing RF PAs in wireless headsets. The
MAX4231/MAX4233 offer a SHDN feature that drives
the output low. This ensures that the RF PA is fully dis­abled when needed, preventing unconverted signals to
the RF antenna.

The MAX4230 family offers low offsets, wide bandwidth,
and high-output drive in a tiny 2.1mm x 2.0mm space­saving 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

o 200mA Output Drive Capability

o Rail-to-Rail Input and Output

o 1.1mA Supply Current per Amplifier

o 2.7V to 5.5V Single-Supply Operation

o 10MHz Gain-Bandwidth Product

o High Slew Rate: 10V/µs

o 100dB Voltage Gain (R

L

= 100kΩ)

o 85dB Power-Supply Rejection Ratio

o No Phase Reversal for Overdriven Inputs

o Unity-Gain Stable for Capacitive Loads to 780pF

o Low-Power Shutdown Mode Reduces Supply

Current to < 1µA

o Available in 5-Pin SC70 Package (MAX4230)

and 6-Pin, UCSP and Thin µDFN Packages
(MAX4231)

o 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 15; 3/12

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

+

Denotes a lead-free(Pb)/RoHS-compliant package.

T = Tape and reel.

Typical Operating Circuit

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.

PART

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 ABNF

MAX4231ART+T -40°C to +125°C 6 UCSP AAM

MAX4231AYT+T -40°C to +125°C 6 Thin µDFN +AH

TEMP RANGE

PIN­PACKAGE

TOP

M ARK

ANTENNA

DAC

RR

2.7V TO 5.5V

MAX4231

SHDN

C

F

PA

I

= 30mA

R

ISO

OUT

C

LOAD

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 (VDDto VSS)....................................................6V

All Other Pins ...................................(V

SS

- 0.3V) to (VDD+ 0.3V)

Output Short-Circuit Duration to V

DD

or VSS(Note 1) ................10s

Continuous Power Dissipation (Multilayer, T

A

= +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

Note 1: Package power dissipation should also be observed.

)

DC ELECTRICAL CHARACTERISTICS

(VDD= 2.7V, VSS= 0V, VCM= VDD/2, V

OUT

= (VDD/2), RL= ∞ connected to (VDD/2), V

SHDN

= VDD, TA= +25°C, unless otherwise

noted.) (Note 2)

µMAX is a registered trademark of Maxim Integrated Products, Inc.

- V

- V

- V

VDD - V

V

VDD - V

V

0.85 ±6mV

1pA

50 pA

1000 MΩ

SS

V

DD

52 70 dB

OH

SS

OH

SS

OH

SS

OL

OL

- V

- V

OH

SS

OH

SS

400 500

360 500

80 120

70 120

814

714

128 200

112 175

240 320

224 300

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Operating Supply Voltage Range V

Input Offset Voltage V

Input Bias Current (Note 4) I

Input Offset Current I

Input Resistance R

Common-Mode Input Voltage
Range

Common-Mode Rejection Ratio CMRR VSS < VCM < V

Power-Supply Rejection Ratio PSRR VDD = 2.7V to 5.5V 73 85 dB

Shutdown Output Impedance R

Output Voltage in Shutdown V

Output Voltage Swing V

Output Source/Sink Current I

Output Voltage

DD

OS

OS

V

CM

OUT

OUT(SHDN

VOL

Inferred from PSRR test 2.7 5.5 V

VCM = VSS to V

B

VCM = VSS to V

IN

DD

DD

Inferred from CMRR test V

DD

V

= 0V (Note 3) 10 Ω

SHDN

V

= 0V, RL = 200Ω (Note 3) 68 120 mV

SHDN

VSS + 0.20V < V

OUT

< VDD - 0.20V

RL = 32Ω

OUT

RL = 200Ω

R

= 2kΩ

L

VDD = 2.7V, VIN = ±100mV 70

OUT

VDD = 5V, VIN = ±100mV 200

IL = 10mA VDD = 2.7V

I

= 30mA VDD = 5V

L

RL = 100kΩ 100

RL = 2kΩ 85 98Large-Signal Voltage Gain A

R

= 200Ω 74 80

L

VDD - V

V

OL

VDD - V

V

OL

VDD - V

V

OL

V

dB

mV

mA

mV

MAX4230–MAX4234

High-Output-Drive, 10MHz, 10V/µs,

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

_______________________________________________________________________________________ 3

(

)

)

DC ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V, VSS= 0V, VCM= VDD/2, V

OUT

= (VDD/2), RL= ∞ connected to (VDD/2), V

SHDN

= VDD, TA= +25°C, unless otherwise

noted.) (Note 2)

DC ELECTRICAL CHARACTERISTICS

(VDD= 2.7V, VSS= 0V, VCM= VDD/2, V

OUT

= (VDD/2), RL= ∞ connected to (VDD/2), V

SHDN

= VDD, TA= -40 to +125°C, unless other-

wise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Quiescent Supply Current (per
Amplifier)

Shutdown Supply Current (per
Amplifier) (Note 3)

I

SHDN Logic Threshold (Note 3)

SHDN Input Bias Current VSS < V

VDD = 5.5V, VCM = VDD / 2 1.2 2.3

VDD = 2.7V, VCM = VDD / 2 1.1 2.0

V

= 0V, RL = ∞

S HDN

Shutdown mode 0.8

IL

Normal mode VDD x 0.57

IH

< VDD (Note 3) 50 pA

S HDN

DD

I

DD

SHDN

V

V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Operating Supply Voltage Range V

Input Offset Voltage V

Offset-Voltage Tempco ∆V

Input Bias Current (Note 4) I

DD

OS

OS

B

Inferred from PSRR test 2.7 5.5 V

/∆T ±3 µV/°C

TA = -40°C to +85°C17

TA = -40°C to +125°C 550

VDD = 5.5V 0.5 1

= 2.7V 0.1 1

V

DD

mA

µA

V

±8mV

pA

Common-Mode Input Voltage Range V

CM

Common-Mode Rejection Ratio CMRR VSS < VCM < V

Inferred from CMRR test V

DD

SS

V

DD

46 dB

Power-Supply Rejection Ratio PSRR VDD = 2.7V to 5.5V 70 dB

Output Voltage in Shutdown V

OUT(SHDN

Large-Signal Voltage Gain A

Output Voltage Swing V

Output Voltage

VOL

OUT

V

< 0V, RL = 200Ω (Note 3) 150 mV

SHDN

VSS + 0.2V < VDD - 0.2V

RL = 32Ω, TA = +85°C

RL = 200Ω

RL = 2kΩ

IL = 10mA VDD = 2.7V

I

= 30mA,

L

T

= -40°C

A

V

= 5V

DD

to +85°C

RL = 2kΩ 76

= 200Ω 67

R

L

VDD - V

OH

- V

V

OL

SS

VDD - V

OH

- V

V

OL

SS

VDD - V

OH

- V

V

OL

SS

VDD - V

OH

- V

V

OL

SS

VDD - V

OH

- V

V

OL

SS

650

650

150

150

20

20

250

230

400

370

dB

mV

mV

V

MAX4230–MAX4234

High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70

4 _______________________________________________________________________________________

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.

)

DC ELECTRICAL CHARACTERISTICS (continued)

(VDD= 2.7V, VSS= 0V, VCM= VDD/2, V

OUT

= (VDD/2), RL= ∞ connected to (VDD/2), V

SHDN

= VDD, TA= -40 to +125°C, unless other-

wise noted.) (Note 2)

AC ELECTRICAL CHARACTERISTICS

(VDD= 2.7V, VSS= 0V, VCM= VDD/2, V

OUT

= (VDD/2), RL= ∞ connected to (VDD/2), V

SHDN

= VDD, TA= +25°C, unless otherwise noted.)

(Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Quiescent Supply Current
(per Amplifier)

Shutdown Supply Current
(per Amplifier) (Note 3)

SHDN Logic Threshold (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Gain-Bandwidth Product GBWP VCM = VDD/2 10 MHz

Full-Power Bandwidth FPBW V

Slew Rate SR 10 V/µs

Phase Margin PM 70 Degrees

Gain Margin GM 15 dB

Total Harmonic Distortion Plus
Noise

Input Capacitance C

Voltage-Noise Density e

Channel-to-Channel Isolation f = 1kHz, RL = 100kΩ 125 dB

Capacitive-Load Stability A

Shutdown Time t

Enable Time from Shutdown t

Power-Up Time t

I

DD

I

DD(SHDN

V

IL

V

IH

THD+N f = 10kHz, V

IN

n

SHDN

ENABLE

ON

VDD = 5.5V, VCM = VDD/2 2.8

VDD = 2.7V, VCM = VDD/2 2.5

V

< 0V, RL = ∞

SHDN

Shutdown mode 0.8

Normal mode VDD x 0.61

= 2V

OUT

f = 1kHz 15

f = 10kHz 12

= 1V/V, no sustained oscillations 780 pF

VCL

(Note 3) 1 µs

(Note 3) 1 µs

, VDD = 5V 0.8 MHz

P-P

= 2V

OUT

P-P

VDD = 5.5V 2.0

= 2.7V 2.0

V

DD

, A

= 1V/V 0.0005 %

VCL

8pF

5µs

mA

µA

V

nV/√Hz

MAX4230–MAX4234

High-Output-Drive, 10MHz, 10V/µs,

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

_______________________________________________________________________________________ 5

__________________________________________Typical Operating Characteristics

(VDD= 2.7V, VSS= 0V, VCM= VDD/2, V

OUT

= VDD/2, RL= ∞, connected to VDD/2, V

SHDN

= VDD, TA = +25°C, unless otherwise noted.)

GAIN AND PHASE vs. FREQUENCY

70

60

50

40

30

20

GAIN (dB)

10

0

-10

-20

-30

= 1000V/V

A

V

0.01k 10k 100k 1M 10M0.1k 1k 100M
FREQUENCY (Hz)

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

0

-10

-20

-30

-40

-50

-60

PSRR (dB)

-70

-80

-90

-100

0.01k 10k 100k 1M0.1k 1k 10M
FREQUENCY (Hz)

SUPPLY CURRENT vs. TEMPERATURE

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

SUPPLY CURRENT (mA)

0.4

0.2

0

-40 0 20 40-20 60 80 100 120

TEMPERATURE (°C)

A

V

MAX4230 toc01

= 1V/V

120

90

60

30

0

-30

-60

-90

-120

-150

-180

MAX4230 toc03

MAX4230 toc05

PHASE (DEGREES)

GAIN AND PHASE vs. FREQUENCY

= 250pF)

(C

70

60

50

40

30

20

GAIN (dB)

10

0

-10
= 1000V/V

A

V

= 250pF

C

L

-20

-30

0.01k 10k 100k 1M 10M0.1k 1k 100M

L

FREQUENCY (Hz)

MAX4230 toc02

OUTPUT IMPEDANCE vs. FREQUENCY

1000

100

10

1

OUTPUT IMPEDANCE (Ω)

0.1

= 1V/V

A

V

0.01
1k 100k 1M10k 10M

FREQUENCY (Hz)

SUPPLY CURRENT vs. TEMPERATURE

(SHDN = LOW)

110

100

90

80

70

SUPPLY CURRENT (nA)

60

50

-40 0-20 20 40 60 80 100 120

TEMPERATURE (°C)

SHDN = V

120

90

60

30

0

-30

-60
PHASE (DEGREES)

-90

-120

-150

-180

MAX4230 toc04

MAX4230 toc06

SS

MAX4230–MAX4234

High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70

6 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(VDD= 2.7V, VSS= 0V, VCM= VDD/2, V

OUT

= VDD/2, RL= ∞, connected to VDD/2, V

SHDN

= VDD, TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT PER AMPLIFIER

vs. SUPPLY VOLTAGE

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

SUPPLY CURRENT (mA)

0.4

0.2

0

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)

MAX4230 toc07

(mV)

OS

V

OUTPUT SWING LOW

vs. TEMPERATURE

140

120

100

(mV)

SS

- V

OUT

V

80

60

40

20

0

V

= 5.0V

DD

Ω

= 200

R

L

V

= 2.7V

DD

Ω

= 200

R

L

-40 0 20-20 40 60 80 100 120

TEMPERATURE (°C)

MAX4230/3 toc10

-0.5

-1.0

INPUT OFFSET VOLTAGE (mV)

-1.5

-2.0

SUPPLY CURRENT PER AMPLIFIER

vs. COMMON-MODE VOLTAGE

MAX4230/34 toc13

0.45

0.40

0.35

0.30

0.25

0.20

THD+N (%)

0.15

0.10

0.05

1.4

1.2

1.0

0.8

0.6

SUPPLY CURRENT (mA)

0.4

0.2

02.01.50.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0
COMMON-MODE VOLTAGE (V)

VDD = 5.0V

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

2

VDD = 2.7V

1

0

-1

-2

-40 0-20 20 40 60 80 100 120
TEMPERATURE (°C)

VDD = 5.0V

INPUT OFFSET VOLTAGE

vs. COMMON-MODE VOLTAGE

1.0

0.5

0

0 0.5 1.0

COMMON-MODE VOLTAGE (V)

1.5

2.0 2.5

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

V

= 2V

OUT

P-P

500kHz LOWPASS FILTER

RL = 32Ω

0

10 100 1k 10k 100k

FREQUENCY (Hz)

RL = 10kΩ

100

MAX4230 toc08

80

(mV)

60

OUT

- V

DD

V

40

20

0

1.2

1.0

MAX4230/3 toc11

0.8

0.6

SUPPLY CURRENT (mA)

0.4

0.2

TOTAL HARMONIC DISTORTION PLUS NOISE

10

MAX4230/34 toc14

1

0.1

THD+N (%)

0.001

0.0001

OUTPUT SWING HIGH

vs. TEMPERATURE

V

= 5.0V

DD

Ω

= 200

R

L

V

= 2.7V

DD

Ω

= 200

R

L

120

-40 0-20

20

40 60 80

TEMPERATURE (°C)

100

SUPPLY CURRENT PER AMPLIFIER

vs. COMMON-MODE VOLTAGE

V

= 2.7V

DD

0 0.5 1.0

COMMON-MODE VOLTAGE (V)

1.5

2.0 2.5

vs. PEAK-TO-PEAK OUTPUT VOLTAGE

f = 10kHz

= 5V

V

DD

RL = 25

4.0 4.2 4.6 5.0
PEAK-TO-PEAK OUTPUT VOLTAGE (V)

RL = 250

Ω

4.4

RL = 2k

Ω

RL = 100k

Ω

Ω

4.8

MAX4230/34 toc09

MAX4230/3 toc12

MAX4230/34 toc15

MAX4230–MAX4234

High-Output-Drive, 10MHz, 10V/µs,

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

_______________________________________________________________________________________ 7

____________________________Typical Operating Characteristics (continued)

(VDD= 2.7V, VSS= 0V, VCM= VDD/2, V

OUT

= VDD/2, RL= ∞, connected to VDD/2, V

SHDN

= VDD, TA = +25°C, unless otherwise noted.)

SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)

IN

50mV/div

OUT

400ns/div

MAX4230/34 toc16

LARGE-SIGNAL TRANSIENT

RESPONSE (INVERTING)

IN

1V/div

OUT

400ns/div

MAX4230/34 toc19

OUTPUT CURRENT vs. OUTPUT VOLTAGE

(SOURCING, V

250

= 5.0V)

DD

V

DIFF

= 100mV

SMALL-SIGNAL TRANSIENT

RESPONSE (INVERTING)

IN

50mV/div

OUT

400ns/div

OUTPUT CURRENT vs. OUTPUT VOLTAGE

(SOURCING, V

80

70

60

50

40

30

OUTPUT CURRENT (mA)

20

10

0

1.0 1.4 1.6 1.8 2.01.2 2.2 2.4 2.6 2.8 3.0
OUTPUT VOLTAGE (V)

OUTPUT CURRENT vs. OUTPUT VOLTAGE

(SINKING, V

0

DD

= 2.7V)

DD

= 5.0V)

V

DIFF

V

DIFF

MAX4230/34 toc17

= 100mV

= 100mV

LARGE-SIGNAL TRANSIENT

RESPONSE (NONINVERTING)

IN

1V/div

OUT

400ns/div

MAX4230/34 toc18

OUTPUT CURRENT vs. OUTPUT VOLTAGE

0

-10

MAX4230/34 toc20

-20

-30

-40

-50

OUTPUT CURRENT (mA)

-60

-70

-80

(SINKING, V

0 0.4 0.60.2 0.8 1.0 1.2 1.4 1.6

OUTPUT VOLTAGE (V)

= 2.7V)

DD

V

DIFF

= 100mV

INPUT VOLTAGE NOISE

vs. FREQUENCY

200
100

MAX4230/34 toc21

200

150

100

OUTPUT CURRENT (mA)

50

0

2.0 3.02.5 3.5 4.0 4.5 5.0
OUTPUT VOLTAGE (V)

MAX4230/34 toc22

-100

-150

OUTPUT CURRENT (mA)

-200

-250

-50

01.00.5 1.5 2.0 2.5 3.0
OUTPUT VOLTAGE (V)

MAX4230/34 toc23

INPUT VOLTAGE NOISE (nV/√Hz)

10

100 10k 100k

1k

FREQUENCY (Hz)

MAX4230/34 toc24

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 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 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 fol­lowing equations. The equation below gives an approxi­mation of the package power dissipation:

where:

V

RMS

= RMS voltage from VDDto V

OUT

when sourcing

current and RMS voltage from V

OUT

to V

SS

when sink-

ing current.

I

RMS

= 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.

High-Output-Drive, 10MHz, 10V/µs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70

8 _______________________________________________________________________________________

Pin Description

PIN

M AX42 30

SOT 23 /

SC7 0

— 5 B3 — 5, 6 C4, A4 —

— — — 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

— — — — — — 9, 13 IN 3- , IN 4- Inverting Input to Amplifiers 3 and 4

— — — — — — 8, 14

M AX42 31

SOT 23 /

SC7 0/Th in

µ DF N

1 1 B1 — — — — IN+ Noninverting Input

2 2 A1 4 4 B4 11 V

3 3 B2 — — — — IN- Inverting Input

4 4 A2 — — — — OUT Amplifier Output

5 6 A3 8 10 B1 4 V

M A X42 31

U CSP

M AX42 32

SOT 23 /

µ M A X

M A X4 2 3 3

µ M A X

M AX42 33

U CSP

M AX42 34

T SSOP/

SO

NAME FUNCTION

Negative Supply Input. Connect to

SS

ground for single-supply operation.

Positive Supply Input

DD

SHDN,

SHDN1,

SHDN2

IN3+,

OUT3,

OUT4

Shutdown Control. Tie to high for normal
operation.

Noninverting Input to Amplifiers 3 and 4

Amplifiers 3 and 4 Outputs

P V I COS

IC DISS RMS RMS

()

≅θ

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.

V

PEAK

= the highest positive excursion of the AC com-

ponent of the output voltage.

I

PEAK

= the highest positive excursion of the AC com-

ponent of the output current.

Therefore:

P

IC(DISS)

= V

RMSIRMS

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:

P

IC(DISS)

= V

RMSIRMS

COS θ

= 15.6mW

If the configuration in Figure 1 were used with all four of
the MAX4234 amplifiers, the absolute maximum power­dissipation rating of this package would be exceeded
(see the

Absolute Maximum Ratings

section).

60mW Single-Supply Stereo

Headphone Driver

Two MAX4230/MAX4231s can be used as a single-sup­ply, stereo headphone driver. The circuit shown in
Figure 2 can deliver 60mW per channel with 1% distor­tion from a single 5V supply.

The input capacitor (CIN), in conjunction with RIN, forms
a highpass filter that removes the DC bias from the
incoming signal. The -3dB point of the highpass filter is
given by:

MAX4230–MAX4234

High-Output-Drive, 10MHz, 10V/µs,

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

_______________________________________________________________________________________ 9

Figure 2. Circuit Example: Adding a Coupling Capacitor
Greatly Reduces Power Dissipation of its Package

Figure 1. MAX4230/MAX4231 Used in Single-Supply Operation
Circuit Example

3.6V

R

V

= 2V

IN

C

P-P

MAX4230

R

MAX4231

32Ω

V

V V

≅−

RMS DD DC

. .

I +

RMS

.

()

=−+=

VV

36 18

I

DC

mA

PEAK

2

RMS

≅=+

I

=

78 4

PEAK

+

2

.

V

10

.

2 507

2

VV

183210 32

.

Ω

V

RMS

./

2

Ω

R

F

C

IN

R

LEFT

AUDIO INPUT

C

IN

RIGHT

AUDIO INPUT

V

RMS

IN

V

BIAS

R

IN

V

PEAK

≅

2

.

V

10

==

.

0 707

2

I

I +

≅=+

RMS

.

IA

=

22 1

DC

mA

PEAK

2

RMS

MAX4230

R

F

V

RMS

0

C

OUT

C

OUT

./

10 32

HEADPHONE JACK

TO 32Ω STEREO

HEADSET

V

Ω

2

f

dB

−=3

2π

1

RC

IN IN