MAX4373 데이터 시트보기 (PDF) - Maxim Integrated
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MAX4373
Maxim Integrated
MAX4373 Datasheet PDF : 12 Pages
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Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
MAX4373
µMAX/SO
1
2
3
PIN
MAX4374/MAX4375
µMAX
SO
1
1
2
2
3
4
NAME
VCC
OUT
CIN1
—
4
5
CIN2
4
5
7
GND
5
6
8
RESET
6
8
11
COUT1
—
7
10
COUT2
7
9
13
RS-
8
10
14
RS+
—
—
3, 6, 9, 12
N.C.
Pin Description
FUNCTION
FUNCTION
Supply Voltage Input
Voltage Output. VOUT is proportional to VSENSE (VRS+ - VRS-).
Comparator Input 1. Positive input of an internal comparator. The nega-
tive terminal is connected to a 0.6V internal reference.
Comparator Input 2. Terminal of a second internal comparator. The pos-
itive terminal for the MAX4374 and the negative terminal for the
MAX4375. The other terminal is connected to a 0.6V internal reference.
Ground
Reset Input. Resets the output latch of the comparator at CIN1.
Comparator Output. Latching output of the comparator controlled by
CIN1. Connect RESET to GND to disable the latch.
Comparator Output. Output of the second unlatched internal
comparator.
Load-Side Connection for the External Sense Resistor
Power Connection to the External Sense Resistor
No Connection. Not internally connected.
VIN = 0 TO 28V
VPULL-UP = 5V
R3
VPULL-UP = 5V
R6
+ VSENSE -
RSENSE
RS+
RS-
VCC
CURRENT-
SENSE
OUT
AMPLIFIER
COUT1
RESET
COUT2
+
CIN1
-
+(-)
CIN2
-(+)
0.6V
BANDGAP
REFERENCE
MAX4374/MAX4375
GND
Figure 1. Functional Diagram
LOAD
R1 R4
R2
R5
Detailed Description
The MAX4373 high-side current-sense supervisor fea-
tures a high-side current-sense amplifier, bandgap ref-
erence, and comparator with latching output to monitor
a supply for an overcurrent condition (Figure 1). The
latching output allows the comparator to shut down a
power supply without oscillations. The MAX4374/
MAX4375 offer an additional comparator to allow win-
dow detection of the current.
Current-Sense Amplifier
The internal current-sense amplifier features a 0V to
+28V input common-mode range that is independent of
the supply voltage. With this feature, the device can
monitor the output current of a battery in deep dis-
charge and also high-side current-sensing voltages
exceeding VCC.
The current-sense amplifier is also suitable for low-side
current sensing. However, the total output voltage error
will increase when VRS+ falls below 2V, as shown in
_______________________________________________________________________________________ 9
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