MAX9928/MAX9929
EVALUATION KIT AVAILABLE
-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 monitor-
ing battery charge and discharge currents in notebooks,
cell phones, and other portable equipment. These devices
feature a wide -0.1V to +28V input common-mode voltage
range, low 20μA supply current with VOS less than 0.4mV,
and a gain accuracy better than 1.0%. The input common-
mode range is independent of the supply voltage, ensur-
ing that the current-sense information remains accurate
even when the measurement 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 volt-
age 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 measuring
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
compatible with the MAX4372_EBT.
Features
●● Wide -0.1V to +28V Common-Mode Range,
Independent of Supply Voltage
●● 2.5V to 5.5V Operating Supply Voltage
●● 20μA Quiescent Supply Current
●● 0.4mV (max) Input Offset Voltage
●● Gain Accuracy Better than 1% (max)
●● SIGN Output Indicates Current Polarity
●● Transconductance and Gain Versions Available
• 5μA/mV (MAX9928F)
• 50V/V (MAX9929F)
●● Pin Compatible with the MAX4372 in UCSP
●● 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
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.
Ordering Information
PART
OUTPUT TYPE
GAIN
PIN-PACKAGE
MAX9928FAUA+
Current
Gm = 5μA/mV
8 μMAX
MAX9928FABT+T
Current
Gm = 5μA/mV
3x2 UCSP
MAX9929FAUA+
Voltage
AV = 50V/V
8 μMAX
MAX9929FABT+T
Voltage
AV = 50V/V
3x2 UCSP
Note: All devices are specified over the -40°C to +125°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TOP MARK
—
+AAF
—
+ADI
19-4251; Rev 4; 9/14
