19-4251; Rev 0; 8/08
-0.1V to +28V Input Range, Micropower,
Uni-/Bidirectional, Current-Sense Amplifiers
www.datasheet4u.com
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
VOS 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/MAX9928T feature a current output with
transconductance ratios of 5µA/mV and 2µA/mV, respec-
tively. 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/MAX9929T have a voltage output
and integrate a 10kΩ output resistor for fixed voltage
gains of 50V/V and 20V/V, respectively.
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
♦ 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
♦ Two IOUT Transconductance Versions Available
2µA/mV (MAX9928T)
5µA/mV (MAX9928F)
♦ Two VOUT Gain Versions Available
20V/V (MAX9929T)
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
Ordering Information
PART
OUTPUT TYPE
GAIN
PIN-PACKAGE
TOP MARK
PKG CODE
MAX9928FAUA+
MAX9928FABT+T †
MAX9928TAUA+
MAX9928TABT+T †
MAX9929FAUA+
MAX9929FABT+T †
Current
Current
Current
Current
Voltage
Voltage
Gm = 5µA/mV
Gm = 5µA/mV
Gm = 2µA/mV
Gm = 2µA/mV
AV = 50V/V
AV = 50V/V
8 µMAX
3x2 UCSP
8 µMAX
3x2 UCSP
8 µMAX
3x2 UCSP
—
+AAA
—
+AAC
—
+AAB
U8-1
R61A1+1
U8-1
R61A1+1
U8-1
R61A1+1
MAX9929TAUA+*
Voltage
AV = 20V/V
8 µMAX
MAX9929TABT+* †
Voltage
AV = 20V/V
3x2 UCSP
Note: All devices are specified over the -40°C to +125°C operating temperature range.
—
+AAD
U8-1
R61A1+1
+Denotes a lead-free/RoHS-compliant package.
*Future product—contact factory for availability.
†The MAX9928_ABT and the MAX9929_ABT use Package Code R61A1+1 with backside coating to minimize die chipping.
________________________________________________________________ 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.
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