Single/Dual/Quad, Low-Cost, Single-Supply,

Rail-to-Rail Op Amps with Shutdown

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7

FUNCTION

—

—

Noninverting Amplifier Input A

—

—

Noninverting Amplifier Input B

—

—

Noninverting Amplifier Input C

—

—

Noninverting Amplifier Input D

—

—

Inverting Amplifier Input B

—

—

Inverting Amplifier Input A

3

3

Inverting Amplifier Input

2

2

Negative Supply. Connect to ground for single-

supply operation

—

—

Amplifier Output B

—

—

Amplifier Output A

4

4

Amplifier Output

—

—

Inverting Amplifier Input D

—

—

Inverting Amplifier Input C

Pin Description

—

5

normal operation. Do not leave floating.

5

6

Positive Supply

—

—

Amplifier Output D

—

—

Amplifier Output C

3

5

—

—

6

2

—

4

7

1

—

—

—

—

8

—

—

PIN

3

5

10

12

6

2

—

11

7

1

—

13

9

—

4

14

8

NAME

INA+

INB+

INC+

IND+

INB-

INA-

IN-

OUTB

OUTA

OUT

IND-

INC-

SHDN

OUTD

OUTC

1

Noninverting Amplifier Input

1

—

—

IN+

MAX4401

MAX4400

MAX4402

MAX4403

Detailed Description

Rail-to-Rail Output Stage

The MAX4400–MAX4403 can drive a 2k

Ω load and still

typically swing within 55mV of the supply rails. Figure 1

shows the output voltage swing of the MAX4400 config-

Driving Capacitive Loads

Driving a capacitive load can cause instability in many

op amps, especially those with low quiescent current.

The MAX4400–MAX4403 are unity-gain stable for a

range of capacitive loads to above 400pF. Figure 2

shows the response of the MAX4400 with an excessive

capacitive load. Adding a series resistor between the

output and the load capacitor (Figure 3) improves the

1V/div

100µs/div

Figure 1. Rail-to-Rail Output Operation