MAX4373 Maxim, MAX4373 Datasheet - Page 9

• Manufacturer Part Number: MAX4373
• Description: The MAX4373/MAX4374/MAX4375 low-cost, micropower, high-side current-sense supervisors contain a high-side current-sense amplifier, bandgap reference, and comparator with latching output
• Manufacturer: Maxim

Figure 1. Functional Diagram
µMAX/SO
MAX4373
(UP TO 5V)
V
PULL-UP
Low-Cost, Micropower, High-Side Current-Sense
V
IN
—
—
—
(UP TO 5V)
1
4
2
3
5
6
7
8
= 0 TO 28V
V
PULL-UP
R6
R3
MAX4374/MAX4375
µMAX
PIN
10
—
1
2
3
4
5
6
8
7
9
COUT2
COUT1
RESET
_______________________________________________________________________________________
V
CC
RS+
Amplifier + Comparator + Reference ICs
3, 6, 9, 12
CURRENT-
AMPLIFIER
(MAX4375)
REFERENCE
+ V
MAX4374
BANDGAP
SENSE
R
SO
SENSE
SENSE
0.6V
11
10
13
14
GND
1
2
4
5
7
8
+(-)
-(+)
+
-
-
RS-
CIN1
CIN2
OUT
COUT1
COUT2
RESET
NAME
CIN1
CIN2
GND
OUT
RS+
N.C.
V
RS-
CC
R1
R2
LOAD
R4
R5
Supply Voltage Input
Voltage Output. V
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.
Open-Drain Comparator Output. Latching output of the comparator con-
trolled by CIN1. Connect RESET to GND to disable the latch.
Open-Drain Comparator Output. Output of the second unlatched inter-
nal comparator.
Load-Side Connection for the External Sense Resistor
Power Connection to the External Sense Resistor
No Connection. Not internally connected.
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.
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 V
The current-sense amplifier is also suitable for low-side
current sensing. However, the total output voltage error
will increase when V
the Electrical Characteristics and Typical Operating
Characteristics .
OUT
is proportional to V
CC
.
FUNCTION
FUNCTION
RS+
Detailed Description
Current-Sense Amplifier
falls below 2V, as shown in
SENSE
Pin Description
(V
RS+
- V
RS-
).
9