19-1630; Rev 4; 1/11
KIT
ATION
EVALU
E
BL
AVAILA
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
General Description
The MAX4373/MAX4374/MAX4375 low-cost, micropow-
er, high-side current-sense supervisors contain a high-
side current-sense amplifier, bandgap reference, and
comparator with latching output. They feature a voltage
output that eliminates the need for gain-setting resistors,
making them ideal for today’s notebook computers, cell
phones, and other systems where battery/DC current
monitoring is critical. High-side current monitoring is
especially useful in battery-powered systems since it
does not interfere with the ground path of the battery
charger. The 0 to +28V input common-mode range is
independent of the supply voltage, which ensures that
the current-sense feedback remains viable even when
connected to a battery pack in deep discharge.
The comparator output of the MAX4373/MAX4374/
MAX4375 is latched to provide a turn-off flag that
doesn’t oscillate. In addition, the MAX4374/MAX4375
contain a second comparator for use in window-detec-
tion functions. The MAX4373/MAX4374/MAX4375 are
available in three different gain versions (T = +20V/V,
F = +50V/V, H = +100V/V) and use an external sense
resistor to set the sensitivity of the input voltage to the
load current. These features offer a high level of inte-
gration, resulting in a simple and compact current-
sense solution.
The MAX4373/MAX4374/MAX4375 operate from a sin-
gle +2.7V to +28V supply and consume 50µA. They are
specified for the extended operating temperature range
(-40°C to +85°C) and are available in 8-pin and 10-pin
µMAX® packages.
♦
50µA Supply Current
♦
Single +2.7V to +28V Operating Supply
♦
1mV (max) Input Offset Voltage
♦
2% (max) Full-Scale Accuracy
♦
Internal Bandgap Reference (±1.6% Accuracy)
♦
Latching Comparator Output
♦
Three Gain Versions Available (+20V/V, +50V/V,
+100V/V)
♦
High Accuracy +2V to +28V Common-Mode
Range, Functional Down to 0V, Independent of
Supply Voltage
Features
♦
Current-Sense Amplifier plus Internal Comparator
and Bandgap Reference with Improved Accuracy
MAX4373/MAX4374/MAX4375
Ordering Information
PART
MAX4373TEUA+
MAX4373TESA+
MAX4373FEUA+
MAX4373FESA+
MAX4373HEUA+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
GAIN
(V/V)
+20
+20
+50
+50
+100
MAX4373HESA+ -40°C to +85°C 8 SO
+100
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
Applications
Notebook Computers
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
Cell Phones
Power-Management Systems
General-System/Board-Level Current Monitoring
Precision Current Sources
Typical Operating Circuit
+ V
SENSE
-
V
IN
= 0 TO 28V
R
SENSE
RS+
V
CC
= 2.7V TO 28V
C1
0.1µF
V
CC
RS-
LOAD/
BATTERY
I
LOAD
MAX4373
OUT
V
PULL-UP
(UP TO 5V)
R3
COUT
CIN
R1
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
RESET
GND
R2
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
MAX4373/MAX4374/MAX4375
ABSOLUTE MAXIMUM RATINGS
V
CC
, RS+, RS- to GND ...........................................-0.3V to +30V
OUT to GND ................................................-0.3V to the lesser of
(V
CC
+ 0.3V) or +15V
CIN1, CIN2, RESET to GND ........................-0.3V to the lesser of
(V
CC
+ 0.3V) or +12V
Differential Input Voltage (V
RS
+ - V
RS
-) ..............................±0.3V
COUT1, COUT2 to GND........................................-0.3V to +6.0V
Current into Any Pin..........................................................±10mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
14-Pin SO (derate 8.3mW/°C above +70°C)................667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +28V, V
RS+
= 0 to +28V, V
SENSE
= 0V, V
RESET
= 0V, R
LOAD
= 1MΩ, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
(Note 2)
Common-Mode Input Range
(Note 3)
Common-Mode Rejection
Supply Current
Leakage Current
SYMBOL
V
CC
V
CMR
CMR
I
CC
V
RS+
> 2V
V
RS+
> 2V, V
SENSE
= 5mV
V
RS+
> 2V
V
RS+
≤
2V
V
RS+
> 2V
V
RS+
≤
2V
Gain = +20V/V, +50V/V, V
RS+
= 12V
Gain = +100V/V, V
RS+
= 12V
V
CC
= V
RS+
= 12V
(Note 11)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
±5.0
±5.0
2.5
8.5
65
0.25
mV
V
±0.35
±0.30
0
-25
0
-50
150
100
170
120
0.1
1
2
±2
±3
±2
±3
%
CONDITIONS
MIN
2.7
0
85
50
±0.015
100
±0.5
2.5
2.0
4
4
mV
mV
µA
TYP
MAX
28
28
UNITS
V
V
dB
µA
µA
I
RS+,
I
RS-
V
CC
= 0V, V
RS+
= 28V
I
RS+
Input Bias Current
I
RS-
Full-Scale Sense Voltage
(Note 4)
Input Offset Voltage
V
SENSE
V
OS
Total OUT Voltage Error
(Note 5)
V
OUT
V
SENSE
=
100mV
(Note 6)
V
CC
= 12V,
V
RS+
= 12V
V
CC
= 28V,
V
RS+
= 28V
V
CC
= 12V, V
RS+
= 0.1V
V
SENSE
= 6.25mV, V
CC
= 12V,
V
RS+
= 12V (Note 7)
OUT Voltage Low
OUT Voltage High
V
OUT
V
CC -
V
OH
V
CC
= 2.7V,
V
RS+
= 12V
I
OUT
= 10µA
I
OUT
= 100µA
V
CC
= 2.7V, I
OUT
= -500µA, V
RS+
= 12V
2
_______________________________________________________________________________________
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +28V, V
RS+
= 0 to +28V, V
SENSE
= 0V, V
RESET
= 0V, R
LOAD
= 1MΩ, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
V
SENSE
= 100mV,
Gain = +20V/V
-3dB Bandwidth
BW
V
SENSE
= 100mV,
Gain = +50V/V
V
SENSE
= 100mV,
Gain = +100V/V
V
SENSE
= 6.25mV
MAX437_T
Gain
A
V
MAX437_F
MAX437_H
V
SENSE
=
20mV to 150mV;
V
CC
= 12V; V
RS+
=
12V; Gain = 20, 50
Gain Accuracy
∆A
V
V
SENSE
=
20mV to 100mV,
V
CC
= 12V, V
RS+
=
12V, Gain = 100
Gain = +20V/V,
V
CC
= 12V,
V
RS+
= 12V,
C
LOAD
= 10pF
R
OUT
PSR
V
SENSE
= 100mV
V
OUT
= 2V, V
RS+
> 2V
V
SENSE
= 100mV, C
LOAD
= 10pF,
V
CC
= 12V, V
RS+
= 12V
V
CC
= 12V, V
RS+
= 12V, C
LOAD
= 10pF
72
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
V
SENSE
= 6.25mV to
100mV
V
SENSE
= 100mV to
6.25mV
20
µs
20
1000
1.5
87
0.5
0.1
pF
Ω
dB
ms
ms
±0.3
MIN
TYP
200
120
110
50
+20
+50
+100
±0.3
±1.7
±2.7
%
±1.7
±2.7
V/V
MAX
UNITS
MAX4373/MAX4374/MAX4375
V
RS+
= 12V,
V
CC
= 12V,
C
LOAD
= 10pF
kHz
OUT Settling Time to 1% of
Final Value
Capacitive Load Stability
OUT Output Resistance
Power-Supply Rejection
Power-Up Time to 1% of Final
Value
Saturation Recovery Time
(Note 8)
COMPARATOR
(Note 9)
Comparator Threshold
Comparator Hysteresis
Input Bias Current
Propagation Delay
Output Low Voltage
V
OL
I
B
V
TH
No sustained oscillations
T
A
= +25°C
T
A
= T
MIN
to T
MAX
590
586
600
-9
±2.2
610
614
±15
mV
mV
nA
µs
C
L
= 10pF, R
L
= 10kΩ pull-up to 5V,
5mV of overdrive
I
SINK
= 1mA
4
0.6
V
_______________________________________________________________________________________
3
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
MAX4373/MAX4374/MAX4375
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +28V, V
RS+
= 0 to +28V, V
SENSE
= 0V, V
RESET
= 0V, R
LOAD
= 1MΩ, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Output High Leakage Current
RESET
Input High Voltage
RESET
Input Low Voltage
Logic Input Current
Minimum
RESET
Pulse Width
RESET
Propagation Delay
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
V
IH
V
IL
I
IL
, I
IH
t
RPW
t
RPD
V
IL
= 0, V
IH
= 5.5V, V
CC
= 28V
-0.5
1.5
3
SYMBOL
CONDITIONS
V
CC
= 28V, V
PULL-UP
= 5V (Note 10)
2.0
0.8
0.5
MIN
TYP
MAX
1
UNITS
µA
V
V
µA
µs
µs
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Guaranteed by PSR test.
Guaranteed by OUT Voltage Error test.
Guaranteed by Gain Accuracy test. Output voltage is internally clamped not to exceed 12V.
Total OUT Voltage Error and Full-Scale Accuracy are the sum of gain and offset voltage errors.
Measured at I
OUT
= -500µA (R
LOAD
= 4kΩ for gain of +20V/V, R
LOAD
= 10kΩ for gain of +50V/V, R
LOAD
= 20kΩ for gain of
+100V/V).
+6.25mV = 1/16 of +100mV full-scale voltage.
The device will not experience phase reversal when overdriven.
All comparator tests are done with V
RS+
= +12V.
V
PULL-UP
is defined as an externally applied voltage through a resistor to pull up the comparator output.
V
OS
is extrapolated from the gain accuracy test.
Typical Operating Characteristics
(V
RS+
= +12V, V
CC
= +12V, R
LOAD
= 1MΩ, V
RESET
= 0V, V
SENSE
= 100mV, V
PULL-UP
= +5V, R
PULL-UP
= 10kΩ, T
A
= +25°C, unless
otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4373 toc01
SUPPLY CURRENT
vs. COMMON-MODE VOLTAGE
MAX4373 toc02
TOTAL OUTPUT ERROR
vs. SUPPLY VOLTAGE
1.5
1.0
OUTPUT ERROR (%)
0.5
0
A
V
= +20V/V
-0.5
-1.0
-1.5
V
SENSE
= 100mV
-2.0
A
V
= +50V/V
A
V
= +100V/V
MAX4373 toc03
60
MAX4374/MAX4375
50
SUPPLY CURRENT (µA)
40
30
20
10
V
SENSE
= 5mV
0
0
5
10
15
20
25
MAX4373
52
51
SUPPLY CURRENT (µA)
50
49
48
47
MAX4373
46
45
V
SENSE
= 5mV
44
MAX4374/MAX4375
2.0
30
0
5
10
15
20
25
30
2 4 6 8 10 12 14 16 18 20 22 24 26 28
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
COMMON-MODE VOLTAGE (V)
4
_______________________________________________________________________________________
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
Typical Operating Characteristics (continued)
(V
RS+
= +12V, V
CC
= +12V, R
LOAD
= 1MΩ, V
RESET
= 0V, V
SENSE
= 100mV, V
PULL-UP
= +5V, R
PULL-UP
= 10kΩ, T
A
= +25°C, unless
otherwise noted.)
TOTAL OUTPUT ERROR
vs. SUPPLY VOLTAGE
MAX4373 toc04
MAX4373/MAX4374/MAX4375
TOTAL OUTPUT ERROR
vs. SENSE VOLTAGE
MAX4373 toc05
TOTAL OUTPUT ERROR
vs. SENSE VOLTAGE
1.5
OUTPUT ERROR (%)
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
A
V
= +50V/V
A
V
= +100V/V
A
V
= +20V/V
MAX4373 toc06
5
4
3
OUTPUT ERROR (%)
2
1
0
-1
-2
-3
-4
-5
V
SENSE
= 6.25mV
A
V
= +20V/V
A
V
= +100V/V
A
V
= +50V/V
1.5
V
CC
= +5.5V
1.0
OUTPUT ERROR (%)
0.5
A
V
= +100V/V
0
-0.5
-1.0
-1.5
-2.0
-2.5
A
V
= +50V/V
A
V
= +20V/V
2.0
2 4 6 8 10 12 14 16 18 20 22 24 26 28
SUPPLY VOLTAGE (V)
0
25
50
75
V
SENSE
(mV)
100
125
150
0
25
50
75
V
SENSE
(mV)
100
125
150
TOTAL OUTPUT ERROR
vs. SENSE VOLTAGE
MAX4373 toc07
TOTAL OUTPUT ERROR
vs. COMMON-MODE VOLTAGE
10
OUTPUT ERROR (%)
8
6
4
2
0
-2
A
V
= +20V/V
2 4 6 8 10 12 14 16 18 20 22 24 26 28
COMMON-MODE VOLTAGE (V)
A
V
= +50V/V
A
V
= +100V/V
MAX4373 toc08
3.0
2.5
OUTPUT ERROR (%)
A
V
= +100V/V
2.0
1.5
1.0
0.5
0
0
25
50
75
V
SENSE
(mV)
100
A
V
= +20V/V
12
V
CC
= +28V
A
V
= +50V/V
125
150
SMALL-SIGNAL PULSE RESPONSE
(A
V
= +20V/V)
MAX4373 toc09
SMALL-SIGNAL PULSE RESPONSE
(A
V
= +50V/V)
MAX4373 toc10
SMALL-SIGNAL PULSE RESPONSE
(A
V
= +100V/V)
MAX4373 toc11
INPUT
INPUT
INPUT
30mV
30mV
30mV
10mV
10mV
10mV
OUTPUT
OUTPUT
OUTPUT
600mV
1.5V
3V
200mV
500mV
1V
20µs/div
20µs/div
20µs/div
_______________________________________________________________________________________
5
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