MAX4073F Maxim, MAX4073F Datasheet

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MAX4073F

Manufacturer Part Number
MAX4073F
Description
The MAX4073 low-cost, high-side current-sense amplifier 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
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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MAX4073F Summary of contents

Page 1

... 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. Low-Cost, SC70, Voltage-Output, o Low-Cost, Compact, Current-Sense Solution o Three Gain Versions Available +20V/V (MAX4073T) +50V/V (MAX4073F) +100V/V (MAX4073H) o ±1.0% Full-Scale Accuracy o 500µA Supply Current o Wide 1.8MHz Bandwidth o +3V to +28V Operating Supply ...

Page 2

... A MIN MAX V = 6.25mV (Note 5 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 ± ...

Page 3

... 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 unless otherwise noted ...

Page 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 1.00 0.90 MAX4073T 0.80 0.70 0. (V) RS+ TOTAL OUTPUT ERROR vs. SUPPLY VOLTAGE 2 6.25mV SENSE 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2 SUPPLY VOLTAGE (V) SUPPLY CURRENT vs. ...

Page 5

... POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 100 MAX4073H 90 MAX4073F 80 MAX4073T 0 FREQUENCY (kHz) MAX4073F SMALL-SIGNAL TRANSIENT RESPONSE V SENSE 2.5mV/div OUT 125mV/div 1µs/div _______________________________________________________________________________________ Low-Cost, SC70, Voltage-Output, Typical Operating Characteristics (continued) = 5pF +25°C, unless otherwise noted GAIN ACCURACY vs. TEMPERATURE 2.0 ...

Page 6

... 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 MAX4073 toc20 V = +3V CC 250mV 50mV 1µs/div ...

Page 7

... RGD / RG1. Therefore, V OUT (I ), where GAIN = 20V/V for MAX4073T, GAIN = LOAD 50V/V for MAX4073F, and GAIN = 100V/V for MAX4073H. 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 ...

Page 8

... The resis- tance-temperature coefficient of copper is fairly high (approximately 0.4%/°C), so systems that experience a wide temperature variance must compensate for this effect. In addition, do not exceed the maximum power dissipation of the copper trace. For example, the MAX4073T (with a maximum load cur- rent of 10A and 5mΩ ...

Page 9

High-Side Current-Sense Amplifier Table 1. Recommended Component Values FULL-SCALE LOAD CURRENT I (A) LOAD 0 TOP VIEW OUT GND V CC Chip Information TRANSISTOR COUNT: 187 PROCESS: Bipolar _______________________________________________________________________________________ Low-Cost, SC70, Voltage-Output, CURRENT-SENSE RESISTOR GAIN R (mΩ) ...

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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