MAX9929F Maxim, MAX9929F Datasheet

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MAX9929F

Manufacturer Part Number
MAX9929F
Description
The MAX9928F/MAX9929F low-cost, uni-/bidirectional, high-side, current-sense amplifiers are ideal for monitoring battery charge and discharge currents in notebooks, cell phones, and other portable equipment
Manufacturer
Maxim
Datasheet

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The MAX9928/MAX9929 low-cost, uni-/bidirectional,
high-side, current-sense amplifiers are ideal for moni-
toring battery charge and discharge currents in note-
books, cell phones, and other portable equipment.
These devices feature a wide -0.1V to +28V input com-
mon-mode voltage range, low 20µA supply current with
V
1.0%. The input common-mode range is independent
of the supply voltage, ensuring that the current-sense
information remains accurate even when the measure-
ment rail is shorted to ground.
The MAX9928F features a current output with a transcon-
ductance ratio of 5µA/mV. An external resistor converts
the output current to a voltage, allowing adjustable gain
so that the input sense voltage can be matched to the
maximum ADC input swing. The MAX9929F has a voltage
output and integrates a 10kΩ output resistor for a fixed
voltage gain of 50V/V.
A digital SIGN output indicates direction of current flow,
so the user can utilize the full ADC input range for mea-
suring both charging and discharging currents.
The MAX9928/MAX9929 are fully specified over the -40°C
to +125°C automotive temperature range, and available
in 6-bump UCSP™ (1mm x 1.5mm) and 8-pin µMAX
packages. The UCSP package is bump-to-bump com-
patible with the MAX4372_EBT.
Note: All devices are specified over the -40°C to +125°C operating temperature range.
+ Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
*
19-4251; Rev 2; 4/11
UCSP is a trademark and µMAX is a registered trademark of
Maxim Integrated Products, Inc.
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
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.
The MAX9928FABT and the MAX9929FABT use Package Code R61A1+1 with backside coating to minimize die chipping.
MAX9928FAUA+
MAX9928FABT+T
MAX9929FAUA+
MAX9929FABT+T
OS
less than 0.4mV, and a gain accuracy better than
PART
Uni-/Bidirectional, Current-Sense Amplifiers
*
*
________________________________________________________________ Maxim Integrated Products
-0.1V to +28V Input Range, Micropower,
General Description
OUTPUT TYPE
Current
Current
Voltage
Voltage
G
G
A
A
m
m
®
V
V
= 5µA/mV
= 5µA/mV
GAIN
= 50V/V
= 50V/V
o Wide -0.1V to +28V Common-Mode Range,
o 2.5V to 5.5V Operating Supply Voltage
o 20µA Quiescent Supply Current
o 0.4mV (max) Input Offset Voltage
o Gain Accuracy Better than 1% (max)
o SIGN Output Indicates Current Polarity
o Transconductance and Gain Versions Available
o Pin Compatible with the MAX4372 in UCSP
o Available in Ultra-Small, 3x2 UCSP
Independent of Supply Voltage
(1mm x 1.5mm) and 8-Pin µMAX Packages
5µA/mV (MAX9928F)
50V/V (MAX9929F)
Monitoring Charge/Discharge Currents in
Portable/Battery-Powered Systems
Notebook Computers
General-System/Board-Level Current Monitoring
Smart-Battery Packs/Chargers
Precision Current Sources
Smart Cell Phones
Super Capacitor Charge/Discharge
PIN-PACKAGE
8 µMAX
3x2 UCSP
8 µMAX
3x2 UCSP
Ordering Information
Applications
TOP MARK
Features
+AAF
+ADI
1

Related parts for MAX9929F

MAX9929F Summary of contents

Page 1

... Denotes a lead-free/RoHS-compliant package Tape and reel. * The MAX9928FABT and the MAX9929FABT use Package Code R61A1+1 with backside coating to minimize die chipping. ________________________________________________________________ Maxim Integrated Products 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. ...

Page 2

... T = +25°C A RS+ + -40°C to +125°C A MAX992_F SENSE A MAX9929F +25°C MAX9929F 3.6V RS -40°C to +125° +25°C MAX9929F -0. -40°C to +125°C RS MAX9928F +25°C MAX9928F 3. -40°C to +125°C RS +25°C MAX9928F ...

Page 3

... 0V 10kΩ for MAX9928F, T RS+ RS- OUT CONDITIONS MAX9928F OUT MAX9929F MAX9928F 10kΩ OUT V OH MAX9929F T = +25° MAX9929F -40°C to +125° +25° MAX9928F -40°C to +125° +25° 3.6V RS -40°C to +125°C ...

Page 4

Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers ELECTRICAL CHARACTERISTICS (continued -0.1V to +28V 3.3V, V RS+ CC SENSE wise noted. Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL AC ELECTRICAL ...

Page 5

Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers (V = 3.3V 12V +25°C, unless otherwise noted HISTOGRAM 50V ...

Page 6

... 0 100 V (mV) SENSE MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 -25 - 5.5 TEMPERATURE (° 3.6V CM 100 1000 MAX9929F V vs. V OUT SENSE 3 -40°C A 3.2 = 5.5V 3.0 2 +125°C A 2.6 2.4 2.2 2 120 140 V (mV) SENSE GAIN ACCURACY vs. TEMPERATURE 1.0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0 ...

Page 7

... Typical Operating Characteristics (continued) V SENSE V OUT 10k 100k 2 3 MAX9928 toc21 V SENSE 2mV/div V OUT 1V/div MAX9929F LARGE-SIGNAL TRANSIENT RESPONSE MAX9928 toc18 50mV/div 1V/div 100μs/div OVERDRIVE RECOVERY MAX9928 toc20 V SENSE 100mV/div V OUT 500mV/div 400μs/div POWER-UP DELAY MAX9928 toc22 ...

Page 8

... The MAX9928F/MAX9929F oper- CC ate from a 2.5V to 5.5V single supply and draw a low 20µA quiescent supply current. Current flows through the sense resistor, generating a sense voltage V (Figure 1) ...

Page 9

... S1 80kΩ For both positive and negative V current flowing out of the current mirror is equal to: For the MAX9928F, the transconductance of the device is trimmed so that I MAX9929F, the voltage gain of the device is trimmed so that V the comparator indicates the polarity of V 1.0 2.0 3.0 The output voltage equation for the MAX9928_ is given ...

Page 10

... Figure 2). Comparator hysteresis of 0.6mV pre- vents oscillation of SIGN output. If current direction is not needed, leave SIGN unconnected. Applications Information Choosing R The MAX9928F/MAX9929F operate over a wide variety of current ranges with different sense resistors. Adjust the R value to monitor higher or lower current lev- SENSE els ...

Page 11

... MAX9928F V 5.5V SIGN CC MAX9929F 0.1μF OUT GND *FOR THE MAX9928F ONLY ______________________________________________________________________________________ TOP VIEW (BUMPS ON THE BOTTOM) 8 OUT A 7 GND N.C. B WALL-CUBE CHARGER μC DIGITAL INPUT ADC R * OUT GND Pin Configurations GND OUT CC MAX9928F MAX9929F RS+ SIGN RS- UCSP (1mm x 1.5mm) 11 ...

Page 12

... Uni-/Bidirectional, Current-Sense Amplifiers For the latest package outline information and land patterns (footprints 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 per- tains to the package regardless of RoHS status ...

Page 13

... Uni-/Bidirectional, Current-Sense Amplifiers For the latest package outline information and land patterns (footprints 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 per- tains to the package regardless of RoHS status ...

Page 14

... Updated top marks 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...

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