MAX4072AUA(2003) 查看數據表（PDF） - Maxim Integrated
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MAX4072AUA
(Rev.:2003)
(Rev.:2003)
Maxim Integrated
MAX4072AUA Datasheet PDF : 16 Pages
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Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
Table 1. Recommended Component Values
FULL-SCALE
CURRENT
(A)
0.075
0.05
0.75
0.5
3.75
2.5
7.5
5.0
15.0
10.0
CURRENT-SENSE
RESISTOR (mΩ)
1000
100
20
10
5
GAIN
(V/V)
50
100
50
100
50
100
50
100
50
100
VSENSE
(mV)
75
50
75
50
75
50
75
50
75
50
FULL-SCALE OUTPUT
VOLTAGE WITH RESPECT
TO REF (V)
3.75
5.0
3.75
5.0
3.75
5.0
3.75
5.0
3.75
5.0
core, as in metal-film or wire-wound resistors, they are
a straight band of metal and are available in values
under 1Ω.
Peak Current: The maximum current through RSENSE
must be limited to:
IPEAK = 0.3V / (RSENSE + RTRACE)
where RTRACE is the total stray resistance from RS+
and RS- to RSENSE. To prevent forwarding the back-to-
back diodes between the differential input, the absolute
maximum of the differential input voltage is 0.3V.
Dynamic Range Considerations
Although the MAX4069–MAX4072 have fully symmetri-
cal, bidirectional, VSENSE input capability, the output-
voltage range is usually higher from REF to VCC and
lower from REF to GND (unless the supply voltage is at
the lowest end of the operating range). Therefore, the
user must consider the dynamic range of current moni-
tored in both directions and choose the supply voltage
and the reference voltage (REFOUT or REFIN) to make
sure the output swing above and below REF is ade-
quate to handle the swings without clipping or running
out of headroom.
Shutdown Mode
When SHDN is low, the MAX4069–MAX4072 are shut
down and consume only 10µA. In shutdown mode,
OUT is high impedance and turns off. Connect SHDN
to VCC for normal operation.
Power-Supply Bypassing
and Grounding
The MAX4069–MAX4072 do not require special
bypassing and respond quickly to transient changes in
line current. You can place a large capacitor at the RS-
terminal (or “load” side) to decouple the load and,
thereby, reduce the current transients. These capaci-
tors are not required for operation or stability and their
use does not degrade performance.
The MAX4069–MAX4072 have been designed as a high-
side current monitor to ease the task of grounding any
battery charger, thermistor, etc., that may be a part of
the battery pack. Grounding these devices requires no
special precautions; follow the same cautionary steps
that apply to the system as a whole. High-current sys-
tems can experience large voltage drops across a
ground plane, and this drop may add to or subtract from
VOUT. Using differential measurement between VOUT
and REF prevents this problem. For highest current-mea-
surement accuracy, use a single-point star ground.
On thin QFN packages, there is an exposed paddle that
does not carry any current, but should also be connect-
ed to the ground plane for rated power dissipation.
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