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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9934 Datasheet

Current-Sense Amplifier

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EVALUATION KIT AVAILABLE
MAX9934
High-Precision, Low-Voltage, Current-Sense Amplifier
with Current Output and Chip Select for Multiplexing
General Description
The MAX9934 high-precision, low-voltage, high-side
current-sense amplifier is ideal for both bidirectional
(charge/discharge) and unidirectional current measure-
ments in battery-powered portable and laptop devices.
Input offset voltage (VOS) is a low 10µV (max) at +25°C
across the -0.1V to 5.5V input common-mode voltage
range, and is independent of VCC. Its precision input
specification allows the use of very small sense volt-
ages (typically ±10mV full-scale) for minimally invasive
current sensing.
The output of the MAX9934 is a current proportional to
input VSENSE and is available in either 25µA/mV or
5µA/mV gain options (GM) with gain accuracy better
than 0.25% (max) at +25°C. A chip select (CS) allows
multiplexing of several MAX9934 current outputs to a
single microcontroller ADC channel (see the Typical
Operating Circuit). CS is compatible with 1.8V and 3.3V
logic systems.
The MAX9934 is designed to operate from a 2.5V to
3.6V VCC supply, and draws just 120µA (typ) quiescent
current. When powered down (VCC = 0), RS+ and RS-
draw less than 0.1nA (typ) leakage current to reduce
battery load. The MAX9934 is robust and protected
from input faults of up to ±6V input differential voltage
between RS+ and RS-.
The MAX9934 is specified for operation over the -40°C
to +125°C temperature range and is available in an
8-pin µMAX® or a 6-bump UCSP™ (1mm x 1.5mm x
0.6mm), making it ideal for space-sensitive applications.
Applications
PDAs and Smartphones
MP3 Players
Sensor Instrumentation Amplifiers
Notebook PCs and Ultra-Mobile PCs
Portable Current Monitoring
µMAX is a registered trademark and UCSP is a trademark of
Maxim Integrated Products, Inc.
Features
o Input Offset Voltage: 10µV (max)
o Gain Error Less than 0.25%
o -0.1V to +5.5V Input Common-Mode Voltage
Range
o Chip Select Allows Multiplexing Several MAX9934
Current Monitors to One ADC
o Current Output Allows ROUT Selection
for Gain Flexibility
o Single Supply Operation: 2.5V to 3.6V
o Two Gain Options: GM of 25µA/mV (MAX9934T)
and 5µA/mV (MAX9934F)
o Bidirectional or Unidirectional Operation
o Small, 6-Bump UCSP (1mm x 1.5mm x 0.6mm)
and 8-Pin µMAX Packages
Ordering Information
PART
GAIN
PIN-
PACKAGE
TOP
MARK
MAX9934FART+T
5µA/mV 6 UCSP
AAG
MAX9934FAUA+T
5µA/mV 8 µMAX
MAX9934FAUA/V+T 5µA/mV 8 µMAX
AAG
MAX9934TART+T
25µA/mV 6 UCSP
AAF
MAX9934TAUA+T
25µA/mV 8 µMAX
MAX9934TAUA/V+T 25µA/mV 8 µMAX
AAF
Note: All devices are specified over the -40°C to +125°C
extended temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Typical Operating Circuit
ILOAD
-0.1V VCM 5.5V
RSENSE
RS-
VCC = 3.3V
0.1µF
VCC
MAX9934
OUT
VOUT TO ADC
RS+
GND
ROUT
10k
CS
FROM µC
CHIP SELECT
1000pF
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5011; Rev 3; 11/12


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9934 Datasheet

Current-Sense Amplifier

No Preview Available !

MAX9934
High-Precision, Low-Voltage, Current-Sense Amplifier
with Current Output and Chip Select for Multiplexing
ABSOLUTE MAXIMUM RATINGS
RS+, RS- to GND......................................................-0.3V to +6V
VCC to GND ..............................................................-0.3V to +4V
CS, OUT to GND (VCC = 0, or CS < VIL)..................-0.3V to +4V
OUT to GND (CS > VIH)................................-0.3V to VCC + 0.3V
Differential Input Voltage (RS+ - RS-) ....................................±6V
Output Short-Circuit Current Duration
OUT to GND or VCC ...............................................Continuous
Continuous Input Current into Any Terminal.....................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate multilayer 4.8mW/°C
above +70°C).............................................................388mW
Junction-to-Ambient Thermal Resistance (θJA)
(Note 1) ....................................................................206°C/W
Junction-to-Case Thermal Resistance (θJC)
(Note 1) ......................................................................42°C/W
6-Bump UCSP (derate multilayer 3.9mW/°C
above +70°C).............................................................308mW
Junction-to-Ambient Thermal Resistance (θJA)
(Note 1) ....................................................................260°C/W
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (µMAX only, soldering, 10s) ..............+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
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
(VCC = 3.3V, VRS+ = VRS- = 3.0V, VSENSE = 0V, VCM = (VRS+ + VRS-)/2, VCS = 3.3V, ROUT = 10kto GND for unidirectional opera-
tion, ROUT = 10kto VCC/2 for bidirectional operation. TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA =
+25°C.) (Note 2)
PARAMETER
DC CHARACTERISTICS
SYMBOL
Input Offset Voltage (Note 3)
MAX9934T
VOS
MAX9934F
Input Offset Voltage Drift (Note 3)
MAX9934T
VOS/dT
MAX9934F
CONDITIONS
TA = +25°C
-40°C TA +125°C
TA = +25°C
-40°C TA +125°C
MIN TYP MAX UNITS
±10
±14
µV
±10
±20
±60
nV/°C
±90
Common-Mode Input Voltage
Range (Average of VRS+ and
VRS-) (Note 3)
Common-Mode Rejection Ratio
(Note 3)
CMVR Guaranteed by CMRR2
CMRR1
CMRR2
0 VCM VCC -
0.2V (MAX9934F)
0 VCM VCC -
0.2V (MAX9934T)
-0.1 VCM 5.5V
(MAX9934F)
-0.1 VCM 5.5V
(MAX9934T)
TA = +25°C
-40°C TA +125°C
TA = +25°C
-40°C TA +125°C
TA = +25°C
-40°C TA +125°C
TA = +25°C
-40°C TA +125°C
-0.1
+5.5
V
128 134
112
128 135
109
119 125
104
98 113
98
dB
2 Maxim Integrated


Part Number MAX9934
Description Current-Sense Amplifier
Maker Maxim Integrated Products
Total Page 19 Pages
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