MAX4372H Maxim, MAX4372H Datasheet

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MAX4372H

Manufacturer Part Number
MAX4372H
Description
The MAX4372 low-cost, precision, high-side current-sense amplifier is available in a tiny, space-saving SOT23-5-pin package
Manufacturer
Maxim
Datasheet

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The MAX4372 low-cost, precision, high-side current-
sense amplifier is available in a tiny, space-saving
SOT23-5-pin package. Offered in three gain versions
(T = 20V/V, F = 50V/V, and H = 100V/V), this device
operates from a single 2.7V to 28V supply and con-
sumes only 30µA. It features a voltage output that elimi-
nates the need for gain-setting resistors and is 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 bat-
tery-powered systems since it does not interfere with
the ground path of the battery charger. The input com-
mon-mode range of 0 to 28V is independent of the sup-
ply voltage and ensures that the current-sense
feedback remains viable even when connected to a
2-cell battery pack in deep discharge.
The user can set the full-scale current reading by
choosing the device (T, F, or H) with the desired volt-
age gain and selecting the appropriate external sense
resistor. This capability offers a high level of integration
and flexibility, resulting in a simple and compact cur-
rent-sense solution. For higher bandwidth applications,
refer to the MAX4173T/F/H data sheet.
19-1548; Rev 5; 5/11
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 continued at end of datasheet.
GND
OUT
V
Low-Cost, UCSP/SOT23, Micropower, High-Side
CC
Power-Management Systems
General-System/Board-Level Current Monitoring
Notebook Computers
Portable/Battery-Powered Systems
Smart-Battery Packs/Chargers
Cell Phones
Precision-Current Sources
O T
P
V
1
2
3
E I
MAX4372T/F/H
W
+
Current-Sense Amplifier with Voltage Output
SOT23-5
________________________________________________________________ Maxim Integrated Products
4
5
RS-
RS+
General Description
Pin Configurations
A
B
V
RS+
(BUMPS ON BOTTOM)
1
CC
MAX4372T/F/H
Applications
O T
UCSP
P
GND
2
V
E I
W
OUT
RS-
3
o Low-Cost, Compact Current-Sense Solution
o 30µA Supply Current
o 2.7V to 28V Operating Supply
o 0.18% Full-Scale Accuracy
o 0.3mV Input Offset Voltage
o Low 1.5Ω Output Impedance
o Three Gain Versions Available
o High Accuracy +2V to +28V Common-Mode
o Available in a Space-Saving 5-Pin SOT23 Package
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Note: Gain values are as follows: 20V/V for the T version, 50V/V
for the F version, and 100V/V for the H version.
Ordering Information continued at end of datasheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
MAX4372TEUK-T
MAX4372TEUK+T
MAX4372TESA
MAX4372TESA
MAX4372TEBT-T
MAX4372TEBT+T -40°C to +85°C 3 x 2 UCSP
Range, Functional Down to 0V, Independent of
Supply Voltage
and 3 x 2 UCSP™ (1mm x 1.5mm) Package
+2.7V TO +28V
20V/V (MAX4372T)
50V/V (MAX4372F)
100V/V (MAX4372H)
CONVERTER
PART
PART
A/D
0.1µF
V
CC
+T
Typical Operating Circuit
GND
OUT
V
-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 3 x 2 UCSP
TEMP RANGE PIN-PACKAGE
TEMP RANGE PIN-PACKAGE
CC
MAX4372T/F/H
Ordering Information
Ordering Information
RS+
RS-
R
SENSE
5 SOT23-5
5 SOT23-5
8 SO
8 SO
0 TO 28V
V
IN
V
SENSE
I
LOAD
Features
BATTERY
LOAD/
MARK
MARK
ADIU
ADIU
TOP
TOP
ACX
ACX
1

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MAX4372H Summary of contents

Page 1

... Input Offset Voltage o Low 1.5Ω Output Impedance o Three Gain Versions Available 20V/V (MAX4372T) 50V/V (MAX4372F) 100V/V (MAX4372H) o High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage o Available in a Space-Saving 5-Pin SOT23 Package and UCSP™ (1mm x 1.5mm) Package ...

Page 2

... UCSP (derate 3.4mW/°C above +70°C) ...........273.2mW 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

... SENSE gain = 20V 20mV 12V, SENSE RS gain = 50V 12V 10pF LOAD V = 20mV, SENSE gain = 100V 6.25mV SENSE MAX4372T MAX4372F MAX4372H T = +25° 20mV A SENSE to 100mV,V =12V T = -40°C to +85°C RS 6.25mV to SENSE Gain = 20V/V, 100mV V = 12V 12V, RS+ ...

Page 4

Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output (V = 12V 12V 100mV RS+ SENSE SUPPLY CURRENT vs. SUPPLY VOLTAGE 35.0 32 +100V +50V/V 30 ...

Page 5

... SENSE 50mV 3V V OUT 1V MAX4372T toc15 100mV 10V - MAX4372H SMALL-SIGNAL TRANSIENT RESPONSE MAX4372T toc12 30mV V SENSE 10mV 1.5V V OUT 0.5V 20μs/div MAX4372F LARGE-SIGNAL TRANSIENT RESPONSE MAX4372T toc14 150mV 50mV 7.5V 2.5V 20μs/div SMALL-SIGNAL GAIN vs. FREQUENCY G = 50V 20V/V ...

Page 6

... G1 OUT Figure 1. Functional Diagram ( R1) Given the gain and maximum load current, select R such that V measure lower currents more accurately, use a high G1 value for R voltage, which overcomes offset voltage errors of the internal current amplifier. In applications monitoring very high current, ensure ...

Page 7

... In addition, self-heating will introduce a nonlinearity error. Do not exceed the maximum power dissipation of the copper trace. For example, the MAX4372T (with a maximum load cur- rent of 10A and 5mΩ ...

Page 8

... SOT23-5 MAX4372HESA+T -40°C to +85° MAX4372HEBT+T -40°C to +85° UCSP +Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. Chip Information PROCESS: BiCMOS For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only ...

Page 9

... Current-Sense Amplifier with Voltage Output For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status ...

Page 10

... Current-Sense Amplifier with Voltage Output For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status ...

Page 11

... 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 ____________________ 11 © ...

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