Single/Dual/Quad, Low-Cost, SOT23,

Micropower, Rail-to-Rail I/O Op Amps

10

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Shutdown Mode

The MAX4041 (single) and MAX4043 (dual) feature a

low-power shutdown mode. When the shutdown pin

(SHDN) is pulled low, the supply current drops to 1µA

per amplifier, the amplifier is disabled, and the outputs

enter a high-impedance state. Pulling SHDN high or

leaving it floating enables the amplifier. Take care to

ensure that parasitic leakage current at the SHDN pin

does not inadvertently place the part into shutdown

mode when SHDN is left floating. Figure 4 shows the

output voltage response to a shutdown pulse. The logic

enter shutdown mode.

Load-Driving Capability

The MAX4040–MAX4044 are fully guaranteed over tem-

perature and supply voltage to drive a maximum resis-

tive load of 25k

be driven in many applications. The rail-to-rail output

stage of the amplifier can be modeled as a current

tude of this current source/sink varies with supply

voltage, ambient temperature, and lot-to-lot variations

of the units.

Figures 5a and 5b show the typical current source and

sink capability of the MAX4040–MAX4044 family as a

function of supply voltage and ambient temperature.

The contours on the graph depict the output current

value, based on driving the output voltage to within

50mV, 100mV, and 200mV of either power-supply rail.

1200

0

-60

-40

-20

100

200

400

1000

TEMPERATURE (°C)

0

40

20

600

800

80

60

Figure 5a. Output Source Current vs. Temperature

3000

0

-60

-40

-20

100

500

1000

2500

TEMPERATURE (°C)

0

40

20

1500

2000

80

60

Figure 5b. Output Sink Current vs. Temperature

1V/div

OUT

IN

1V/div

MAX4040-44 fig03

200

µs/div

Figure 3. Rail-to-Rail Input/Output Voltage Range

MAX4040-44 fig04

200

µs/div

5V/div

1V/div

SHDN

OUT

Figure 4. Shutdown Enable/Disable Output Voltage