MAXIM MAX4240, MAX4244 Technical data

19-1343; Rev 3; 9/06

Single/Dual/Quad, +1.8V/10µA, SOT23,

Beyond-the-Rails Op Amps

General Description

The MAX4240–MAX4244 family of micropower op amps
operate from a single +1.8V to +5.5V supply or dual
±0.9V to ±2.75V supplies and have Beyond-the-Rails™
inputs and rail-to-rail output capabilities. These ampli­fiers provide a 90kHz gain-bandwidth product while
using only 10µA of supply current per amplifier. The
MAX4241/MAX4243 have a low-power shutdown mode
that reduces supply current to less than 1µA and forces
the output into a high-impedance state. Although the
minimum operating voltage is specified at +1.8V, these
devices typically operate down to +1.5V. The combina­tion of ultra-low-voltage operation, beyond-the-rails
inputs, rail-to-rail outputs, and ultra-low power con­sumption makes these devices ideal for any portable/
two-cell battery-powered system.

These amplifiers have an input common-mode range
that extends 200mV beyond each rail, and their out­puts typically swing to within 9mV of the rails with a
100kΩ load. Beyond-the-rails input and rail-to-rail out­put characteristics allow the full power-supply voltage
to be used for signal range. The combination of low
input offset voltage, low input bias current, and high
open-loop gain makes them suitable for low-power/low­voltage precision applications.

The MAX4240 is offered in a space-saving 5-pin
SOT23 package. All specifications are guaranteed
over the -40°C to +85°C extended temperature range.

Applications

Two-Cell Battery­Powered Systems

Portable/Battery-Powered
Electronic Equipment

Digital Scales

Strain Gauges
Sensor Amplifiers
Cellular Phones
Notebook Computers
PDAs

Features

♦ Ultra-Low-Voltage Operation:

Guaranteed Down to +1.8V
Typical Operation to +1.5V

♦ Ultra-Low Power Consumption:

10µA Supply Current per Amplifier
1µA Shutdown Mode (MAX4241/MAX4243)
Up to 200,000 Hours Operation from Two AA
Alkaline Cells

♦ Beyond-the-Rails Input Common-Mode Range

♦ Outputs Swing Rail-to-Rail

♦ No Phase Reversal for Overdriven Inputs

♦ 200µV Input Offset Voltage

♦ Unity-Gain Stable for Capacitive Loads up to 200pF

♦ 90kHz Gain-Bandwidth Product

♦ Available in Space-Saving 5-Pin SOT23 and

8-Pin µMAX

®

Packages

Ordering Information

PART TEMP RANGE

MAX4240EUK-T -40°C to +85°C 5 SOT23-5 ACCS

MAX4241EUA -40°C to +85°C 8 µMAX —

MAX4241ESA -40°C to +85°C 8 SO —

MAX4242EUA -40°C to +85°C 8 µMAX —

MAX4242ESA -40°C to +85°C 8 SO —

MAX4243EUB -40°C to +85°C 10 µMAX —

MAX4243ESD -40°C to +85°C 14 SO —

MAX4244ESD -40°C to +85°C 14 SO —

PIN­PACKAGE

TOP

MARK

MAX4240–MAX4244

Selector Guide

PART

MAX4240 1 — 5-pin SOT23

MAX4241 1 Yes 8-pin µMAX/SO

MAX4242 2 — 8-pin µMAX/SO

MAX4243 2 Yes

MAX4244 4 — 14-pin SO

Beyond-the-Rails is a trademark and µMAX is a registered
trademark of Maxim Integrated Products, Inc.

NO. OF

AMPS

SHUTDOWN PIN-PACKAGE

10-pin µMAX,
14-pin SO

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

OUT 1 5 V

V

EE

IN+ 3 4 IN-

Pin Configurations continued at end of data sheet.

Pin Configurations

CC

MAX4240

2

SOT23-5

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

_______________________________________________________________________________________

MAX4240–MAX4244

Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (V

CC

to VEE)....................................................6V

10-pin µMAX (derate 5.6mW/°C above +70°C) ............444mW

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

CC

+ 0.3V) to (V

EE

- 0.3V)

14-pin SO (derate 8.33mW/°C above +70°C)...............667mW

Output Short-Circuit Duration (to V

CC

or VEE)............Continuous

Operating Temperature Range ...........................-40°C to +85°C

Continuous Power Dissipation (T

A

= +70°C)

Junction Temperature......................................................+150°C

5-pin SOT23 (derate 7.1mW/°C above +70°C).............571mW

Storage Temperature Range .............................-65°C to +160°C

8-pin µMAX (derate 4.1mW/°C above +70°C) ..............330mW

Lead Temperature (soldering, 10s) .................................+300°C

8-pin SO (derate 5.88mW/°C above +70°C).................471mW

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.

ELECTRICAL CHARACTERISTICS

(V

CC

= +1.8V to +5.5V, V

EE

= 0, V

CM

= 0, V

OUT

= V

CC

/ 2, R

L

= 100kΩ tied to V

CC

/ 2, SHDN = VCC, TA = +25°C, unless

otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply-Voltage Range V

CC

Inferred from PSRR test 1.8 5.5 V

Supply Current

I

CC

SHDN = V

CC

V

CC

= 1.8V 10 12

µA

per Amplifier

V

CC

= 5.0V 14 18

Shutdown Supply

SHDN = V

EE

V

CC

= 1.8V 1.0 1.5

µA

Current (Note 2)

I

CC(SHDN)

V

CC

= 5.0V 2.0 3.0

MAX4241ESA ±0.20 ±0.75

mVInput Offset Voltage V

OS

(V

EE

- 0.2V) ≤ V

CM

≤

(V

CC

+ 0.2V)

MAX4242ESA/MAX4243ESD/
MAX4244ESD

±0.20 ±0.88

MAX4240EUK/MAX424_EUA/
MAX4243EUB

±0.25 ±1.40

Input Bias Current I

B

(Note 3) ±2 ±6 nA

Input Offset Current I

OS

(Note 3) ±0.5 ±1.5 nA

Differential Input

⎥

V

IN+

- V

IN-

⎥

< 1.0V

45 MΩ

Resistance

R

IN(DIFF)

⎥

V

IN+

- V

IN-

⎥

> 2.5V

4.4 kΩ

Input Common-Mode

V

CM

Inferred from the CMRR test V

EE

- 0.2 V

CC

+ 0.2 V

Voltage Range

MAX4241ESA 72 90

dB

V

CC

= 1.8V

MAX4242ESA/MAX4243ESD/
MAX4244ESD

69 90

Common-Mode
Rejection Ratio
(Note 4)

CMRR

MAX4240EUK/MAX424_EUA/
MAX4243EUB

63 88

V

CC

= 5.0V

MAX4241ESA 74 94

MAX4242ESA/MAX4243ESD/
MAX4244ESD

74 94

MAX4240EUK/MAX424_EUA/
MAX4243EUB

69 90

2

Single/Dual/Quad, +1.8V/10µA, SOT23,

Beyond-the-Rails Op Amps

ELECTRICAL CHARACTERISTICS (continued)

(V

CC

= +1.8V to +5.5V, V

EE

= 0, V

CM

= 0, V

OUT

= V

CC

/ 2, R

L

= 100kΩ tied to V

CC

/ 2, SHDN = VCC, TA = +25°C, unless

otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX4241ESA 77 85

dB

Power-Supply
Rejection Ratio

PSRR 1.8V ≤ V

CC

≤ 5.5V

MAX4242ESA/MAX4243ESD/
MAX4244ESD

77 85

MAX4240EUK/MAX424_EUA/
MAX4243EUB

75 82

V

CC

= 1.8V

R

L

= 100kΩ 76 85

dB

Large-Signal

A

VOL

(V

EE

+ 0.2V) ≤ V

OUT

≤

R

L

= 10kΩ 66 73

Voltage Gain

(V

CC

- 0.2V)
V

CC

= 5.0V

R

L

= 100kΩ 86 94

R

L

= 10kΩ 78 85

V

CC

= 1.8V

R

L

= 100kΩ 8 20

mV

Output Voltage

V

OH

Specified as

R

L

= 10kΩ 40 65

Swing High

⎥ V

CC

- V

OH

⎥

V

CC

= 5.0V

R

L

= 100kΩ 10 25

R

L

= 10kΩ 60 95

V

CC

= 1.8V

R

L

= 100kΩ 6 15

mV

Output Voltage

V

OL

Specified as

R

L

= 10kΩ 23 35

Swing Low

⎥ V

EE

- V

OL

⎥

V

CC

= 5.0V

R

L

= 100kΩ 10 20

R

L

= 10kΩ 40 60

Output Short-Circuit

Sourcing 0.7

mA

Current

I

OUT(SC)

Sinking 2.5

Output Leakage
Current in Shutdown

I

OUT(SHDN)

SHDN = V

EE

= 0, V

CC

= 5.5V

20 50 nA

(Notes 2, 5)

SHDN Logic Low
(Note 2)

V

IL

0.3 x V

CC

V

SHDN Logic High
(Note 2)

V

IH

0.7 x V

CC

V

SHDN Input Bias
Current (Note 2)

IIH, I

IL

SHDN = V

CC

= 5.5V or SHDN = V

EE

= 0

40 80 nA

Channel-to-Channel
Isolation (Note 6)

CH

ISO

Specified at DC 80 dB

Gain-Bandwidth
Product

GBW 90 kHz

Phase Margin

Φ

m

68 degrees

Gain Margin G

m

18 dB

Slew Rate SR 40 V/ms

MAX4240–MAX4244

_______________________________________________________________________________________ 3

_______________________________________________________________________________________

MAX4240–MAX424

Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps

ELECTRICAL CHARACTERISTICS (continued)

(V

CC

= +1.8V to +5.5V, V

EE

= 0, V

CM

= 0, V

OUT

= V

CC

/ 2, R

L

= 100kΩ tied to V

CC

/ 2, SHDN = VCC, TA = +25°C, unless

otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Density

e

n

f = 1kHz 70

nV/√Hz

Density

i

n

f = 1kHz 0.05

pA/√Hz

Capacitive-Load
Stability

A

VCL

= +1V/V, no sustained oscillations 200 pF

Shutdown Time t

SHDN

50 µs

Enable Time from
Shutdown

t

ENABLE

150 µs

Power-Up Time t

ON

200 µs

Input Capacitance C

IN

3 pF

Total Harmonic
Distortion

THD f

IN

= 1kHz, V

CC

= 5.0V, V

OUT

= 2Vp-p, AV = +1V/V 0.05 %

Settling Time to 0.01% t

S

AV = +1V/V, V

CC

= 5.0V, V

OUT

= 2V

STEP

50 µs

ELECTRICAL CHARACTERISTICS

(V

CC

= +1.8V to +5.5V, V

EE

= 0, V

CM

= 0, V

OUT

= V

CC

/ 2, R

L

= 100kΩ tied to V

CC

/ 2, SHDN = VCC, TA = T

MIN

to T

MAX

, unless oth-

erwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply-Voltage Range V

CC

Inferred from PSRR test 1.8 5.5 V

Supply Current

I

CC

SHDN = V

CC

V

CC

= 1.8V 14

µA

per Amplifier

V

CC

= 5.0V 19

Shutdown Supply

SHDN = V

EE

V

CC

= 1.8V 2.0

µA

Current (Note 2)

I

CC(SHDN)

V

CC

= 5.0V 3.5

MAX4241ESA ±1.2

mVInput Offset Voltage V

OS

(V

EE

- 0.2V) ≤ V

CM

≤

(V

CC

+ 0.2V)

MAX4242ESA/MAX4243ESD/
MAX4244ESD

±1.3

MAX4240EUK/MAX424_EUA/
MAX4243EUB

±2.0

Input Offset Voltage
Drift

TC

VOS

2 µV/°C

Input Bias Current I

B

(Note 3) ±15 nA

Input Offset Current I

OS

(Note 3) ±7 nA

Input Common-Mode
Voltage Range

V

CM

Inferred from the CMRR test -0.2 V

CC

+ 0.2 V

4

Input Voltage-Noise

Input Current-Noise

Single/Dual/Quad, +1.8V/10µA, SOT23,

Beyond-the-Rails Op Amps

ELECTRICAL CHARACTERISTICS

(V

CC

= +1.8V to +5.5V, V

EE

= 0, V

CM

= 0, V

OUT

= V

CC

/ 2, R

L

= 100kΩ tied to V

CC

/ 2, SHDN = VCC, TA = T

MIN

to T

MAX

, unless oth-

erwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX4241ESA 65

dB

V

CC

= 1.8V

MAX4242ESA/MAX4243ESD/
MAX4244ESD

65

Common-Mode
Rejection Ratio
(Note 4)

CMRR

MAX4240EUK/MAX424_EUA/
MAX4243EUB

61

V

CC

= 5.0V

MAX4241ESA 71

MAX4242ESA/MAX4243ESD/
MAX4244ESD

71

MAX4240EUK/MAX424_EUA/
MAX4243EUB

67

MAX4241ESA 73

dB

Power-Supply
Rejection Ratio

PSRR 1.8V ≤ V

CC

≤ 5.5V

MAX4242ESA/MAX4243ESD/
MAX4244ESD

73

MAX4240EUK/MAX424_EUA/
MAX4243EUB

71

V

CC

= 1.8V

R

L

= 100kΩ 72

dB

Large-Signal

A

VOL

(V

EE

+ 0.2V) ≤ V

OUT

≤

R

L

= 10kΩ 62

Voltage Gain

(V

CC

- 0.2V)
V

CC

= 5.0V

R

L

= 100kΩ 80

R

L

= 10kΩ 72

V

CC

= 1.8V

R

L

= 100kΩ 25

mV

Output Voltage

V

OH

Specified as

R

L

= 10kΩ 95

Swing High

⎥ V

CC

- V

OH

⎥

V

CC

= 5.0V

R

L

= 100kΩ 30

R

L

= 10kΩ 145

V

CC

= 1.8V

R

L

= 100kΩ 20

mV

Output Voltage

V

OL

Specified as

R

L

= 10kΩ 50

Swing Low

⎥ V

EE

- V

OL

⎥

V

CC

= 5.0V

R

L

= 100kΩ 25

R

L

= 10kΩ 75

Output Leakage
Current in Shutdown

I

OUT(SHDN)

SHDN = V

EE

= 0, V

CC

= 5.5V

100 nA

(Notes 2, 5)

SHDN Logic Low
(Note 2)

V

IL

0.3 x V

CC

V

MAX4240–MAX4244

_______________________________________________________________________________________ 5