Low-Cost, Precision, High-Side
Current-Sense Amplifier
MAX4172
Power-Supply Bypassing and Grounding
In most applications, grounding the MAX4172 requires
no special precautions. However, in high-current sys-
tems, large voltage drops can develop across the
ground plane, which can add to or subtract from V
OUT
.
Use a single-point star ground for the highest current-
measurement accuracy.
The MAX4172 requires no special bypassing and
responds quickly to transient changes in line current. If
the noise at OUT caused by these transients is a prob-
lem, you can place a 1µF capacitor at the OUT pin to
ground. You can also place a large capacitor at the RS
terminal (or load side of the MAX4172) to decouple the
load, reducing the current transients. These capacitors
are not required for MAX4172 operation or stability. The
RS+ and RS- inputs can be filtered by placing a capac-
itor (e.g., 1µF) between them to average the sensed
current.
___________________Chip Information
TRANSISTOR COUNT: 177
SUBSTRATE CONNECTED TO GND
________________________________________________________Package Information
DIM
C
A
0.101mm
0.004 in
B
A1
L
α
e
A
A1
B
C
D
E
e
H
L
α
INCHES
MAX
MIN
0.044
0.036
0.008
0.004
0.014
0.010
0.007
0.005
0.120
0.116
0.120
0.116
0.0256
0.198
0.188
0.026
0.016
6°
0°
MILLIMETERS
MIN
MAX
0.91
1.11
0.10
0.20
0.25
0.36
0.13
0.18
2.95
3.05
2.95
3.05
0.65
4.78
5.03
0.41
0.66
0°
6°
21-0036D
E
H
8-PIN
µMAX
MICROMAX SMALL-OUTLINE
PACKAGE
D
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 1996 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
