MAX4073 Maxim, MAX4073 Datasheet

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MAX4073

Manufacturer Part Number
MAX4073
Description
Low-Cost / SC70 / Voltage-Output / High-Side Current-Sense Amplifier
Manufacturer
Maxim
Datasheet

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The MAX4073 low-cost, high-side current-sense ampli-
fier features a voltage output that eliminates the need
for gain-setting resistors making it ideal for cell phones,
notebook computers, PDAs, and other systems where
current monitoring is crucial. High-side current moni-
toring does not interfere with the ground path of the
battery charger making the MAX4073 particularly useful
in battery-powered systems. The input common-mode
range of +2V to +28V is independent of the supply volt-
age. The MAX4073’s wide 1.8MHz bandwidth makes it
suitable for use inside battery-charger control loops.
The combination of three gain versions and a selec-
table external-sense resistor sets the full-scale current
reading. The MAX4073 offers a high level of integra-
tion, resulting in a simple and compact current-sense
solution.
The MAX4073 operates from a +3V to +28V single sup-
ply and draws only 0.5mA of supply current. This
device is specified over the automotive operating tem-
perature range (-40
space-saving 5-pin SC70 package (half the size of the
SOT23).
For a similar device in a 6-pin SOT23 with a wider com-
mon-mode voltage range (0 to +28V), see the
MAX4173 data sheet.
19-2048; Rev 0; 4/01
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX4073TAXK-T
MAX4073FAXK-T
MAX4073HAXK-T
MAX4073HAUT-T
MAX4073TAUT-T
MAX4073FAUT-T
Cell Phones
Notebook Computers
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
PDAs
Power Management Systems
PA Bias Control
General System/Board-Level Current Monitoring
Precision Current Sources
PART
________________________________________________________________ Maxim Integrated Products
°
C to +125
General Description
°
C) and is available in a
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP. RANGE
High-Side Current-Sense Amplifier
Applications
Low-Cost, SC70, Voltage-Output,
PIN-PACKAGE
5 SC70-5
6 SOT23-6
5 SC70-5
6 SOT23-6
5 SC70-5
6 SOT23-6
o Low-Cost, Compact, Current-Sense Solution
o Three Gain Versions Available
o ±1.0% Full-Scale Accuracy
o 500µA Supply Current
o Wide 1.8MHz Bandwidth
o +3V to +28V Operating Supply
o Wide +2V to +28V Common-Mode Range
o Automotive Temperature Range (-40
o Available in Space-Saving 5-Pin SC70 Package
Pin Configurations appear at end of data sheet.
Independent of Supply Voltage
+20V/V (MAX4073T)
+50V/V (MAX4073F)
+100V/V (MAX4073H)
+2V TO +28V
CONVERTER
+3V TO +28V
A/D
0.1µF
Typical Operating Circuit
GAIN (V/V)
OUT
Ordering Information
RS+
V
CC
MAX4073T/F/H
100
100
20
20
50
50
R
V
GND
SENSE
SENSE
RS-
I
LOAD
BATTERY
TOP MARK
°
LOAD/
Features
C to +125
AAUG
AAUE
AAUF
ACM
ACO
ACN
°
C)
1

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MAX4073 Summary of contents

Page 1

... The MAX4073 offers a high level of integra- tion, resulting in a simple and compact current-sense solution. The MAX4073 operates from a +3V to +28V single sup- ply and draws only 0.5mA of supply current. This device is specified over the automotive operating tem- perature range (-40 ...

Page 2

... V = 12V, SENSE 12V RS 12V, V > 10mV OS CC RS+ SENSE MAX4073T SENSE - V ) MAX4073F 150mV MAX4073H unless otherwise noted. Typical values are MAX MIN TYP MAX 0.5 1.2 0. 120 150 ±1 ±1.0 ±5.0 ± ...

Page 3

... MIN MAX4073H V = 6.25mV to SENSE V = 12V CC 100mV V = 12V RS 100mV to SENSE C = 5pF LOAD 6.25mV OUT V = 60mV, MAX4073T SENSE 24mV, MAX4073F = 3V to 28V C C SENSE V = 12mV, MAX4073H SENSE C = 5pF 100mV LOAD SENSE V = 12V 12V 5pF LOAD = +25°C. All temperature limits are guaranteed by design. ...

Page 4

... MAX4073T -0.6 -0.8 -1 SUPPLY VOLTAGE (V) 4 _______________________________________________________________________________________ Typical Operating Characteristics = 5pF +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 1.5 1.4 MAX4073H 1.3 1.2 1.1 1.0 0.9 MAX4073F 0.8 0.7 MAX4073T 0 100mV SENSE 0 SUPPLY VOLTAGE (V) SUPPLY CURRENT vs. V VOLTAGE RS+ 1. 100mV SENSE 1.50 MAX4073H 1.40 1.30 1.20 1.10 MAX4073F 1 ...

Page 5

... SMALL-SIGNAL GAIN vs. FREQUENCY 45 MAX4073H 40 MAX4073F 35 30 MAX4073T 125 0 100 1000 FREQUENCY (kHz) MAX4073T SMALL-SIGNAL TRANSIENT RESPONSE MAX4073 toc14 100mV 95mV 2V 1.9V 1µs/div MAX4073H SMALL-SIGNAL TRANSIENT RESPONSE MAX4073 toc16 100mV 95mV 10V 9.5V 1µs/div 10,000 5 ...

Page 6

... V SENSE 45mV/div 6.25mV 2V OUT 2.35V/div 0.120V 100mV V SENSE 100mV/div 6.25mV 10V OUT 600mV/div 0.6V MAX4073T START-UP DELAY MAX4073 toc21 + 2V/div OUT 1V/div 1µs/div MAX4073F LARGE-SIGNAL TRANSIENT RESPONSE MAX4073 toc18 100mV 6.25mV 5V 0.3V 1µs/div MAX4073T OVERDRIVE RESPONSE ...

Page 7

... Set the full-scale output range by selecting R the appropriate gain version of the MAX4073. Applications Information Recommended Component Values The MAX4073 senses a wide variety of currents with different sense resistor values. Table 1 lists common resistor values for typical operation of the MAX4073. Choosing R To measure lower currents more accurately, use a large value for R ...

Page 8

... SENSE wide copper trace. Output Impedance The output of the MAX4073 is a current source driving a 12kΩ resistance. Resistive loading added to OUT reduces the output gain of the MAX4073. To minimize output errors for most applications, connect OUT to a high-impedance input stage ...

Page 9

... V CC Chip Information TRANSISTOR COUNT: 187 PROCESS: Bipolar _______________________________________________________________________________________ Low-Cost, SC70, Voltage-Output, CURRENT-SENSE RESISTOR GAIN R (mΩ) SENSE 1000 100 RS- GND 1 MAX4073T/F/H MAX4073T/F GND RS SOT23-6 SC70-5 FULL-SCALE OUTPUT VOLTAGE (FULL-SCALE V = 100mV) SENSE V (V) OUT 20 2 ...

Page 10

... Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...

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