Datasheet

______________________________________________________________________________________
MAX4240–MAX4244
Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps
Table 1. MAX4240/MAX4241 Characteristics with Typical Battery Systems
BATTERY TYPE RECHARGEABLE
V
FRESH
(V)
V
END-OF-LIFE
(V)
CAPACITY,
AA SIZE
(mA-h)
MAX4240/MAX4241
OPERATING TIME
IN NORMAL MODE
(Hours)
MAX4241
OPERATING TIME
IN SHUTDOWN
MODE (Hours)
Alkaline (2 Cells) No 3.0 1.8 2000 200,000 2 x 10
6
Nickel-
Cadmium (2 Cells)
Yes 2.4 1.8 750 75,000 0.75 x 10
6
Lithium-Ion (1 Cell) Yes 3.5 2.7 1000 100,000 10
6
Nickel-Metal-
Hydride (2 Cells)
Yes 2.4 1.8 1000 100,000 10
6
V
IN
= 2V
R
L
= 100kΩ TIED TO V
EE
MAX4240-44 fig06
1200
V
CC
= 5.5V, V
OH
= 200mV
V
CC
= 1.8V,
V
OH
= 200mV
V
CC
= 5.5V, V
OH
= 100mV
V
CC
= 1.8V,
V
OH
= 100mV
V
CC
=
V
CC
=
1.8V,
5.5V, V
V
OH
=
OH
= 5
50mV
0mV
MAX4240-44 fig07a
SHDN
OUTPUT SOURCE CURRENT (µA)
1000
800
600
400
200
0
5V/div
1V/div
OUT
200µs/div
-60 -40 -20
0 20 40 60 80
100
TEMPERATURE (°C)
Figure 6. Shutdown Enable/Disable Output Voltage
Figure 7a. Output Source Current vs. Temperature
GND). When using dual supplies, pull SHDN to V
EE
to
enter shutdown mode.
3000
Load-Driving Capability
The MAX4240–MAX4244 are fully guaranteed over tem-
perature and supply voltage to drive a maximum resis-
tive load of 10kΩ to V
CC
/ 2, although heavier loads can
be driven in many applications. The rail-to-rail output
stage of the amplifier can be modeled as a current
source when driving the load toward V
CC
, and as a cur-
rent sink when driving the load toward V
EE
. The magni-
OUTPUT SINK CURRENT (µA)
2500
2000
1500
1000
tude of this current source/sink varies with supply
500
voltage, ambient temperature, and lot-to-lot variations
of the units.
0
, V
OL
V
CC
V
CC
= 5.5V, V
OL
= 200mV
V
CC
= 1.8V = 200mV
V
CC
= 5.5V,
V
OL
= 100mV
V
CC
= 1.8V, V
OL
= 100mV
= 5.5V, V
OL
= 50mV
V
CC
= 1.8V, V
OL
= 50mV
MAX4240-44 fig07b
Figures 7a and 7b show the typical current source and
sink capability of the MAX4240–MAX4244 family as a
-60 -40 -20
TEMPERATURE (°C)
0 4020 60 80
100
function of supply voltage and ambient temperature.
The contours on the graph depict the output current
Figure 7b. Output Sink Current vs. Temperature
12