Datasheet

11
OPA244, 2244, 4244
®
APPLICATIONS INFORMATION
The OPA244 is unity-gain stable and suitable for a wide
range of general purpose applications. Power supply pins
should be bypassed with 0.01µF ceramic capacitors.
OPERATING VOLTAGE
The OPA244 can operate from single supply (+2.2V to
+36V) or dual supplies (±1.1 to ±18V) with excellent
performance. Unlike most op amps which are specified at
only one supply voltage, the OPA244 is specified for real
world applications; a single set of specifications applies
throughout the +2.6V to +36V (±1.3 to ±18V) supply range.
This allows a designer to have the same assured perfor-
mance at any supply voltage within this range. In addition,
many key parameters are guaranteed over the specified
temperature range, –40°C to +85°C. Most behavior remains
unchanged throughout the full operating voltage range. Pa-
rameters which vary significantly with operating voltage or
temperature are shown in typical performance curves.
Useful information on solder pad design for printed circuit
boards can be found in Burr-Brown's Application Bulletin
AB-132B, “Solder Pad Recommendations for Surface-
Mount Devices,” easily found at Burr-Brown's web site
(http://www.burr-brown.com).
FIGURE 1. Low and High-Side Battery Current Sensing.
R
L
10Ω
A1
OPA244
+
R
1
38.3kΩ
R
3
38.3kΩ
R
5
383kΩ
R
6
10kΩ
R
7
9.09kΩ
R
4
20kΩ
R
2
19.1kΩ
A2
OPA244
R
8
100kΩ
R
H
10Ω
I
H
V+
V–
V+
V–
2.2V to 36V
(±1.1V to ±18V)
V+ for A1, A2
–In
+In
–In
+In
V
O
= 10 • I
H
• R
H
To Load
To Load
V
O
= 10 • I
L
• R
L
Common-mode range of A2
extends to V– for low-side sensing.
Optional for I
B
Cancellation
(R
7
= R
6
II R
8
)
R
2
and R
4
divide down the
common-mode input to A1.
Low-Side
Current Sense
High-Side
Current Sense
Out
Out
NOTE: Low and high-side sensing circuits can be used independently.
V– for A1, A2
I
L