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MAX9928FAUA+T

P1-P3P4-P6P7-P9P10-P12P13-P14
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.
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
MAX9928/MAX9929
-0.1V to +28V Input Range, Micropower,
Uni-/Bidirectional, Current-Sense Amplifiers
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4251; Rev 3; 4/12
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.
EVALUATION KIT
AVAILABLE
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.
PART OUTPUT TYPE GAIN PIN-PACKAGE TOP MARK
MAX9928FAUA+ Current G
m
= 5µA/mV 8 µMAX —
MAX9928FABT+T Current G
m
= 5µA/mV 3x2 UCSP +AAF
MAX9929FAUA+ Voltage A
V
= 50V/V 8 µMAX —
MAX9929FABT+T Voltage A
V
= 50V/V 3x2 UCSP +ADI
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
UCSP is a trademark and µMAX is a registered trademark of
Maxim Integrated Products, Inc.
MAX9928/MAX9929
-0.1V to +28V Input Range, Micropower,
Uni-/Bidirectional, Current-Sense Amplifiers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
RS+
= -0.1V to +28V, V
CC
= 3.3V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, R
OUT
= 10kΩ for MAX9928F, T
A
= -40°C to +125°C, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
V
CC
, SIGN to GND ...................................................-0.3V to +6V
RS+, RS- to GND....................................................-0.3V to +30V
OUT to GND ...............................................-0.3V to (V
CC
+ 0.3V)
Differential Input Voltage (V
RS+
- V
RS-
) .............................. ±30V
OUT, SIGN Short Circuit to V
CC
or GND ...................Continuous
Current into Any Pin..........................................................±20mA
Continuous Power Dissipation (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
AMPLIFIER DC ELECTRICAL CHARACTERISTICS
T
A
= +25°C ±0.1 ±0.4
V
RS+
= 3.6V
T
A
= -40°C to +125°C ±0.8
T
A
= +25°C ±0.6 ±1.0
Input Offset Voltage (Note 2) V
OS
V
RS+
= -0.1V
T
A
= -40°C to +125°C ±3.0
mV
Common-Mode Input Range V
CMR
(Note 3) -0.1 +28 V
T
A
= +25°C 93 104
2V ≤ V
RS+
≤ 28V
T
A
= -40°C to +125°C87
T
A
= +25°C6072
Common-Mode Rejection Ratio CMRR
-0.1V ≤ V
RS+
≤
+2V
T
A
= -40°C to +125°C54
dB
Full-Scale Sense Voltage (Note 2) V
SENSE
MAX992_F ±50 mV
Gain (Note 2) A
V
MAX9929F 50 V/V
T
A
= +25°C ±0.3 ±1.0
MAX9929F,
V
RS+
= 3.6V
T
A
= -40°C to +125°C ±2.5
T
A
= +25°C ±0.3 ±1.0
Gain Accuracy (Notes 2, 6)
MAX9929F,
V
RS+
= -0.1V
T
A
= -40°C to +125°C ±2.8
%
Transconductance (Note 2) G
M
MAX9928F 5 µA/mV
T
A
= +25°C ±0.3 ±1.0
MAX9928F,
V
RS+
= 3.6V
T
A
= -40°C to +125°C ±2.5
T
A
= +25°C ±0.3 ±1.0
Transconductance Accuracy
(Note 2)
MAX9928F,
V
RS+
= -0.1V
T
A
= -40°C to +125°C ±2.8
%
2V ≤ V
RS+
≤ 28V 0 1.6 6
Input Bias Current (Note 4) I
RS+
, I
RS-
-0.1V ≤ V
RS+
≤ +2V -80 +6
µA
2V ≤ V
RS+
≤ 28V ±0.05 ±1
Input Offset Bias Current (Note 4) I
OS
-0.1V ≤ V
RS+
≤ +2V ±0.2 ±2
µA
Input Leakage Current I
RS+
, I
RS-
V
CC
= 0V, V
RS+
= V
RS-
= 28V (Note 5) 0.05 1.0 µA
MAX9928/MAX9929
-0.1V to +28V Input Range, Micropower,
Uni-/Bidirectional, Current-Sense Amplifiers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
RS+
= -0.1V to +28V, V
CC
= 3.3V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, R
OUT
= 10kΩ for MAX9928F, T
A
= -40°C to +125°C, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX9928F 5 MΩ
Output Resistance R
OUT
MAX9929F 6.4 10 13.6 kΩ
MAX9928F, R
OUT
= 10kΩ
(V
CC
-
0.1)
(V
CC
-
0.45)
Output High Voltage (Note 6)
V
OH
MAX9929F
(V
CC
-
0.1)
(V
CC
-
0.45)
V
T
A
= +25°C 0.25 2.0
Minimum Output Voltage (Note 7) V
OL
MAX9929F
T
A
= -40°C to +125°C15
mV
T
A
= +25°C 0.025 0.2
Minimum Output Current (Note 7) I
OL
MAX9928F
T
A
= -40°C to +125°C 1.5
µA
SIGN COMPARATOR DC ELECTRICAL CHARACTERISTICS
T
A
= +25°C -1.6 -1.2 -0.5
V
RS+
= 3.6V
T
A
= -40°C to +125°C -2.15 -0.15
T
A
= +25°C -2.5 -1.2 +0.25
Discharge to Charge Trip Point
(Note 8)
V
TDC
V
RS+
= -0.1V
T
A
= -40°C to +125°C -4.6 +2.3
mV
V
RS+
= 3.6V T
A
= +25°C-1.8
Charge to Discharge Trip Point
(Note 8)
V
TCD
V
RS+
= -0.1V T
A
= +25°C-1.8
mV
Hysteresis Width V
HYS
V
RS+
= 3.6V,
-0.1V
T
A
= +25°C0.6mV
Common-Mode Input Range
(Note 9)
V
CMR
-0.1 +28 V
2V ≤ V
RS+
≤ 28V 102
Common-Mode Rejection Ratio
(Note 9)
CMRR
-0.1V ≤ V
RS+
≤ +2V 74
dB
Output Low Voltage V
OL
I
SINK
= 100µA 0.03 0.1 V
Output High Voltage V
OH
(V
CC
-
0.01)
(V
CC
-
0.04)
V
Internal Pullup Resistor R
PULL-UP
1MΩ
POWER SUPPLY
T
A
= +25°C 2.5 5.5
Supply Voltage Range (Note 10) V
CC
T
A
= -40°C to +125°C 2.8 5.5
V
V
RS+
= 3.6V 72 90
Amplifier Power-Supply Rejection
Ratio (Note 10)
PSRR
A
V
RS+
= -0.1V 66 86
dB
V
RS+
= 3.6V 90
Comparator Power-Supply
Rejection Ratio
PSRR
C
V
RS+
= -0.1V 86
dB
2V ≤ V
RS+
≤ 28V 20 30
Quiescent Supply Current I
CC
-0.1V ≤ V
RS+
< +2V 115 200
µA
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX9928FAUA+T

Mfr. #:
Buy MAX9928FAUA+T
Manufacturer:
Maxim Integrated
Description:
Current Sense Amplifiers .1-28V uPower Current Sense Amp
Lifecycle:
New from this manufacturer.
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