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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9938 Datasheet

Precision Current-Sense Amplifier

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EVALUATION KIT AVAILABLE
MAX9938
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
General Description
The MAX9938 high-side current-sense amplifier offers
precision accuracy specifications of VOS less than 500μV
(max) and gain error less than 0.5% (max). Quiescent
supply current is an ultra-low 1μA. The MAX9938 fits
in a tiny, 1mm x 1mm UCSP™ package size or a 5-pin
SOT23 package, making the part ideal for applications in
notebook computers, cell phones, PDAs, and all battery-
operated portable devices where accuracy, low quiescent
current, and small size are critical.
The MAX9938 features an input common-mode voltage
range from 1.6V to 28V. These current-sense ampli-
fiers have a voltage output and are offered in four gain
versions: 25V/V (MAX9938T), 50V/V (MAX9938F),
100V/V (MAX9938H), and 200V/V (MAX9938W).
The four gain selections offer flexibility in the choice of
the external current-sense resistor. The very low 500μV
(max) input offset voltage allows small 25mV to 50mV
full-scale VSENSE voltage for very low voltage drop at
full-current measurement.
The MAX9938 is offered in tiny 4-bump, UCSP (1mm x
1mm x 0.6mm footprint), 5-pin SOT23, and 6-pin μDFN
(2mm x 2mm x 0.8mm) packages specified for operation
over the -40°C to +85°C extended temperature range.
Applications
● Cell Phones
● PDAs
● Power Management Systems
● Portable/Battery-Powered Systems
● Notebook Computers
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
RS+
5
Features
Ultra-Low Supply Current of 1μA (max)
Low 500μV (max) Input Offset Voltage
● Low < 0.5% (max) Gain Error
Input Common Mode: +1.6V to +28V
● Voltage Output
● Four Gain Versions Available
• +25V/V (MAX9938T)
• 50V/V (MAX9938F)
• 100V/V (MAX9938H)
• 200V/V (MAX9938W)
● Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP, 5-Pin
SOT23, or 2mm x 2mm x 0.8mm, 6-Pin μDFN
Packages
Ordering Information
PART
PIN-
PACKAGE
GAIN
(V/V)
TOP
MARK
MAX9938TEBS+G45 4 UCSP
25 +AGD
MAX9938FEBS+G45 4 UCSP
50 +AGE
MAX9938HEBS+G45 4 UCSP
100 +AGF
MAX9938WEBS+G45 4 UCSP
200 +AGI
MAX9938TEUK+
5 SOT23
25 +AFFB
MAX9938FEUK+
5 SOT23
50 +AFFC
MAX9938HEUK+
5 SOT23
100 +AFFD
MAX9938WEUK+
5 SOT23
200 +AFGZ
MAX9938FELT+
6 µDFN
50 +ACM
+Denotes a lead(Pb)-free/RoHS-compliant package.
G45 indicates protective die coating.
Note: All devices are specified over the -40°C to +85°C
extended temperature range.
UCSP is a trademark of Maxim Integrated Products, Inc.
RS-
TOP VIEW
(PADS ON BOTTOM)
4
RS+
GND
A1 A2
MAX9938T
MAX9938F
MAX9938H
MAX9938W
B1 B2
RS-
OUT
UCSP
DRAWINGS NOT TO SCALE
MAX9938T
MAX9938F
MAX9938H
MAX9938W
1 23
GND GND OUT
SOT23
OUT 1
6 RS-
N.C. 2 MAX9938FELT 5 N.C.
GND 3
4 RS+
µDFN
19-4110; Rev 7; 4/17


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9938 Datasheet

Precision Current-Sense Amplifier

No Preview Available !

MAX9938
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Absolute Maximum Ratings
RS+, RS- to GND...................................................-0.3V to +30V
OUT to GND.............................................................-0.3V to +6V
RS+ to RS-...........................................................................±30V
Short-Circuit Duration: OUT to GND..........................Continuous
Continuous Input Current (Any Pin)..................................±20mA
Continuous Power Dissipation (TA = +70°C)
4-Bump UCSP (derate 3.0mW/°C above +70°C).........238mW
5-Pin SOT23 (derate 3.9mW/°C above +70°C)...........312mW
6-Pin μDFN (derate 4.5mW/°C above +70°C).............358mW
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (excluding UCSP, 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+ = VRS- = 3.6V, VSENSE = (VRS+ - VRS-) = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Supply Current (Note 2)
Common-Mode Input Range
Common-Mode Rejection Ratio
Input Offset Voltage (Note 3)
Gain
Gain Error (Note 4)
Output Resistance
OUT Low Voltage
OUT High Voltage
Small-Signal Bandwidth
(Note 5)
Output Settling Time
SYMBOL
CONDITIONS
ICC
VCM
CMRR
VOS
VRS+ = 5V, TA = +25°C
VRS+ = 5V, -40°C < TA < +85°C
VRS+ = 28V, TA = +25°C
VRS+ = 28V, -40°C < TA < +85°C
Guaranteed by CMRR , -40°C < TA < +85°C
1.6V < VRS+ < 28V, -40°C < TA < +85°C
TA = +25°C
-40°C < TA < +85°C
MAX9938T
MAX9938F
G
MAX9938H
MAX9938W
GE
ROUT
MAX9938T/MAX9938F/
MAX9938H
MAX9938W
(Note 5)
TA = +25°C
-40°C < TA < +85°C
TA = +25°C
-40°C < TA < +85°C
MAX9938T/F/H
MAX9938W
Gain = 25
Gain = 50
VOL Gain = 100
Gain = 200
VOH
BW
tS
VOH = VRS- - VOUT (Note 6)
VSENSE = 50mV, gain = 25
VSENSE = 50mV, gain = 50
VSENSE = 50mV, gain = 100
VSENSE = 50mV, gain = 200
1% final value, VSENSE = 50mV
MIN
1.6
94
7.0
14.0
TYP
0.5
1.1
130
±100
25
50
100
200
±0.1
±0.1
10
20
1.5
3
6
12
0.1
125
60
30
15
100
MAX
0.85
1.1
1.8
2.5
28
±500
±600
UNITS
µA
V
dB
µV
V/V
±0.5
±0.6
±0.7
±0.8
13.2
26.4
15
30
60
120
0.2
%
kΩ
mV
V
V
kHz
µs
www.maximintegrated.com
Maxim Integrated │2


Part Number MAX9938
Description Precision Current-Sense Amplifier
Maker Maxim Integrated Products
Total Page 14 Pages
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