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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9928 Datasheet

(MAX9928 / MAX9929) Current-Sense Amplifiers

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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


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9928 Datasheet

(MAX9928 / MAX9929) Current-Sense Amplifiers

No Preview Available !

MAX9928/MAX9929
-0.1V to +28V Input Range, Micropower,
Uni-/Bidirectional, Current-Sense Amplifiers
Absolute Maximum Ratings
VCC, SIGN to GND..................................................-0.3V to +6V
RS+, RS- to GND...................................................-0.3V to +30V
OUT to GND.............................................. -0.3V to (VCC + 0.3V)
Differential Input Voltage (VRS+ - VRS-)...............................±30V
OUT, SIGN Short Circuit to VCC or GND...................Continuous
Current into Any Pin..........................................................±20mA
Continuous Power Dissipation (TA = +70°C)
6-Bump 1mm x 1.5mm UCSP
(derate 3.9mW/°C above +70°C)...........................308.3mW
8-Pin μMAX (derate 4.8mW/°C above +70°C).............388mW
Operating Temperature Range.......................... -40°C to +125°C
Storage Temperature Range............................. -65°C to +150°C
Junction Temperature.......................................................+150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(VRS+ = -0.1V to +28V, VCC = 3.3V, VSENSE = (VRS+ - VRS-) = 0V, ROUT = 10kΩ for MAX9928F, TA = -40°C to +125°C, unless oth-
erwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
AMPLIFIER DC ELECTRICAL CHARACTERISTICS
Input Offset Voltage (Note 2)
VOS
VRS+ = 3.6V
VRS+ = -0.1V
TA = +25°C
TA = -40°C to +125°C
TA = +25°C
TA = -40°C to +125°C
±0.1
±0.6
±0.4
±0.8
±1.0
±3.0
mV
Common-Mode Input Range
VCMR (Note 3)
-0.1 +28 V
Common-Mode Rejection Ratio
CMRR
2V ≤ VRS+ ≤ 28V
TA = +25°C
TA = -40°C to +125°C
93
87
104
-0.1V ≤ VRS+
TA = +25°C
60 72
+2V
TA = -40°C to +125°C
54
dB
Full-Scale Sense Voltage (Note 2) VSENSE MAX992_F
±50 mV
Gain (Note 2)
AV MAX9929F
50 V/V
Gain Accuracy (Notes 2, 6)
MAX9929F,
VRS+ = 3.6V
MAX9929F,
VRS+ = -0.1V
TA = +25°C
TA = -40°C to +125°C
TA = +25°C
TA = -40°C to +125°C
±0.3
±0.3
±1.0
±2.5
±1.0
±2.8
%
Transconductance (Note 2)
GM MAX9928F
5 µA/mV
Transconductance Accuracy
(Note 2)
MAX9928F,
VRS+ = 3.6V
MAX9928F,
VRS+ = -0.1V
TA = +25°C
TA = -40°C to +125°C
TA = +25°C
TA = -40°C to +125°C
±0.3
±0.3
±1.0
±2.5
±1.0
±2.8
%
Input Bias Current (Note 4)
IRS+, IRS-
2V ≤ VRS+ ≤ 28V
-0.1V ≤ VRS+ ≤ +2V
0 1.6 6
-80 +6
µA
Input Offset Bias Current (Note 4)
IOS
2V ≤ VRS+ ≤ 28V
-0.1V ≤ VRS+ ≤ +2V
±0.05
±0.2
±1
±2
µA
Input Leakage Current
IRS+, IRS- VCC = 0V, VRS+ = VRS- = 28V (Note 5)
0.05 1.0
µA
www.maximintegrated.com
Maxim Integrated │2


Part Number MAX9928
Description (MAX9928 / MAX9929) Current-Sense Amplifiers
Maker Maxim Integrated Products
Total Page 13 Pages
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