MAX4374 Maxim, MAX4374 Datasheet

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MAX4374

Manufacturer Part Number
MAX4374
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
Datasheet

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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.
19-1630; Rev 4; 1/11
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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.
Pin Configurations appear at end of data sheet.
Notebook Computers
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
Cell Phones
Power-Management Systems
General-System/Board-Level Current Monitoring
Precision Current Sources
Low-Cost, Micropower, High-Side Current-Sense
________________________________________________________________ Maxim Integrated Products
Amplifier + Comparator + Reference ICs
General Description
Applications
♦ Current-Sense Amplifier plus Internal Comparator
♦ 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,
♦ High Accuracy +2V to +28V Common-Mode
+ Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
MAX4373TEUA+
MAX4373TESA+
MAX4373FEUA+
MAX4373FESA+
MAX4373HEUA+
MAX4373HESA+
and Bandgap Reference with Improved Accuracy
+100V/V)
Range, Functional Down to 0V, Independent of
Supply Voltage
V
CC
PART
= 2.7V TO 28V
(UP TO 5V)
V
V
IN
PULL-UP
= 0 TO 28V
0.1µF
C1
R3
Typical Operating Circuit
-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
-40°C to +85°C
TEMP RANGE
V
COUT
RESET
Ordering Information
CC
RS+
+ V
MAX4373
R
SENSE
SENSE
GND
-
RS-
PIN-
PACKAGE
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
OUT
CIN
I
LOAD
Features
BATTERY
R1
R2
LOAD/
GAIN
(V/V)
+100
+100
+20
+20
+50
+50
1

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MAX4374 Summary of contents

Page 1

... 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 µ ...

Page 2

... Current into Any Pin..........................................................±10mA 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 ...

Page 3

Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs ELECTRICAL CHARACTERISTICS (continued +2.7V to +28V +28V RS+ Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL -3dB Bandwidth ...

Page 4

... CC = +25°C. All temperature limits are guaranteed by design 4kΩ for gain of +20V/V, R LOAD LOAD = +12V. RS+ Typical Operating Characteristics = 0V 100mV, V RESET SENSE PULL-UP SUPPLY CURRENT vs. COMMON-MODE VOLTAGE 52 51 MAX4374/MAX4375 MAX4373 5mV SENSE COMMON-MODE VOLTAGE (V) = 1MΩ ...

Page 5

Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs (V = +12V +12V 1MΩ, V RS+ CC LOAD otherwise noted.) TOTAL OUTPUT ERROR vs. SUPPLY VOLTAGE +50V +100V/V ...

Page 6

Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs (V = +12V +12V 1MΩ, V RS+ CC LOAD otherwise noted.) LARGE-SIGNAL PULSE RESPONSE (A = +20V/V) V MAX4373 toc12 150mV 50mV 3V 1V 20µs/div COMMON-MODE ...

Page 7

Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs (V = +12V +12V 1MΩ, V RS+ CC LOAD otherwise noted.) POWER-UP DELAY A = +20V OUTPUT 100µs/div COMPARATOR TRIP POINT vs. SUPPLY ...

Page 8

... TEMPERATURE (°C) 8 _______________________________________________________________________________________ Typical Operating Characteristics (continued 100mV, V RESET SENSE PULL- SUPPLY CURRENT vs. TEMPERATURE 70 750mV 60 MAX4374 MAX4375 50 250mV 40 MAX4373 5mV SENSE 0 -60 -40 - TEMPERATURE (° 100 = +5V 10kΩ +25° ...

Page 9

... Comparator Input 1. Positive input of an internal comparator. The nega- CIN1 tive terminal is connected to a 0.6V internal reference. Comparator Input 2. Terminal of a second internal comparator. The pos- CIN2 itive terminal for the MAX4374 and the negative terminal for the MAX4375. The other terminal is connected to a 0.6V internal reference. GND Ground RESET Reset Input ...

Page 10

... MAX4374’s additional comparator and the positive ter- minal of the MAX4375’s additional comparator are con- nected to the internal 600mV reference as shown in Figure 1. The positive terminal of the MAX4374’s addi- tional comparator and the negative terminal of the MAX4375’s additional comparator are accessible at CIN2 ...

Page 11

... The following formula can be used to determine the appropriate RC value. where T is the maximum time for V 0.8V is the maximum RESET logic low voltage. For example, a 470kΩ resistor and 0.22µF capacitor will keep RESET low during a power-up time 36ms. . The simplest ...

Page 12

... MAX4374TEUB+ -40°C to +85°C MAX4374TESD+ -40°C to +85°C MAX4374FEUB+ -40°C to +85°C MAX4374FESD+ -40°C to +85°C MAX4374HEUB+ -40°C to +85°C MAX4374HESD+ -40°C to +85°C MAX4375TEUB+ -40°C to +85°C MAX4375TESD+ -40°C to +85°C MAX4375FEUB+ -40°C to +85°C MAX4375FESD+ -40°C to +85°C MAX4375HEUB+ -40° ...

Page 13

... Clarified V RS+ 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © ...

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