MAX9928F_12 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – -0.1V to +28V Input Range, Micropower Uni-/Bidirectional, Current-Sense Amplifiers

19-4251; Rev 3; 4/12
EVAALVUAAILTAIOBNLEKIT
-0.1V to +28V Input Range, Micropower,
Uni-/Bidirectional, Current-Sense Amplifiers
General Description
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_OS less than 0.4mV, and a gain accuracy better than
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.
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.
Features
o Wide -0.1V to +28V Common-Mode Range,
Independent of Supply Voltage
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
5µA/mV (MAX9928F)
50V/V (MAX9929F)
o Pin Compatible with the MAX4372 in UCSP
o Available in Ultra-Small, 3x2 UCSP
(1mm x 1.5mm) and 8-Pin µMAX Packages
Applications
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
Ordering Information
PART
OUTPUT TYPE
GAIN
PIN-PACKAGE
MAX9928FAUA+
Current
G_m = 5µA/mV
8 µMAX
MAX9928FABT+T
Current
G_m = 5µA/mV
3x2 UCSP
MAX9929FAUA+
Voltage
A_V = 50V/V
8 µMAX
MAX9929FABT+T
Voltage
A_V = 50V/V
3x2 UCSP
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.
TOP MARK
—
+AAF
—
+ADI
________________________________________________________________ Maxim Integrated Products 1
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.