MAX9938 Maxim, MAX9938 Datasheet

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MAX9938

Manufacturer Part Number
MAX9938
Description
The MAX9938 high-side current-sense amplifier offers precision accuracy specifications of VOS less than 500µV (max) and gain error less than 0
Manufacturer
Maxim
Datasheet

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The MAX9938 high-side current-sense amplifier offers
precision accuracy specifications of V
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 accura-
cy, 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 amplifiers
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 V
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.
19-4110; Rev 6; 1/11
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.
Cell Phones
PDAs
Power Management Systems
Portable/Battery-Powered Systems
Notebook Computers
SENSE
DRAWINGS NOT TO SCALE
GND
RS+
________________________________________________________________ Maxim Integrated Products
voltage for very low voltage drop at
(BUMPS ON BOTTOM)
MAX9938T/F/H/W
A1
B1
General Description
TOP VIEW
UCSP
A2
B2
Precision Current-Sense Amplifier
Applications
RS-
OUT
OS
less than
GND
RS+
5
1
MAX9938T/F/H/W
1µA, 4-Bump UCSP/SOT23,
SOT23
GND
2
o Ultra-Low Supply Current of 1µA (max)
o Low 500µV (max) Input Offset Voltage
o Low < 0.5% (max) Gain Error
o Input Common Mode: +1.6V to +28V
o Voltage Output
o Four Gain Versions Available
o Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP,
+ 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.
MAX9938TEBS+G45
MAX9938FEBS+G45
MAX9938HEBS+G45
MAX9938WEBS+G45
MAX9938TEUK+
MAX9938FEUK+
MAX9938HEUK+
MAX9938WEUK+
MAX9938FELT+
RS-
OUT
4
3
25V/V (MAX9938T)
50V/V (MAX9938F)
100V/V (MAX9938H)
200V/V (MAX9938W)
µDFN Packages
5-Pin SOT23, or 2mm x 2mm x 0.8mm, 6-Pin
PART
GND
N.C.
OUT
2
1
3
Ordering Information
(PADS ON BOTTOM)
PIN-
PACKAGE
4 UCSP
4 UCSP
4 UCSP
4 UCSP
5 SOT23
5 SOT23
5 SOT23
5 SOT23
6 μDFN
MAX9938FELT
TOP VIEW
μDFN
Pin Configurations
6
5
4
GAIN
(V/V)
100
200
100
200
25
50
25
50
50
N.C.
RS+
RS-
Features
+AFGZ
+AFFC
+AFFD
MARK
+AFFB
+AGD
+ACM
+AGE
+AGF
+AGI
TOP
1

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MAX9938 Summary of contents

Page 1

... V voltage for very low voltage drop at SENSE 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. Cell Phones ...

Page 2

... -40°C < T < +85°C A MAX9938T MAX9938F G MAX9938H MAX9938W T = +25° 9938T/M AX 9938F/ A MAX9938H - 40°C < +25°C A MAX9938W - 40°C < T MAX9938T/F/H R (Note 5) OUT MAX9938W Gain = 25 Gain = Gain = 100 Gain = 200 (Note RS- OUT ...

Page 3

Precision Current-Sense Amplifier ELECTRICAL CHARACTERISTICS (continued 3.6V RS+ RS- SENSE RS+ RS- Note 1: All devices are 100% production tested at T Note the total ...

Page 4

... 2 1.5 1.0 0 100 V (mV) SENSE CMRR vs. FREQUENCY -60 -80 -100 -120 -140 -160 1MHz 1Hz 10Hz 100Hz 1kHz 10kHz FREQUENCY (kHz) SMALL-SIGNAL PULSE RESPONSE (GAIN = 50) MAX9938 toc13b V SENSE V OUT 25μs/div 150 G = 100 100kHz 1MHz 30mV 20mV 1.5V 1V ...

Page 5

... GND Ground OUT Output Voltage. V N.C. No Connection. Not internally connected. LARGE-SIGNAL PULSE RESPONSE (GAIN = 100) MAX9938 toc14a V SENSE V OUT 20μs/div LARGE-SIGNAL PULSE RESPONSE (GAIN = 25) MAX9938 toc14c V SENSE V OUT 25μs/div Pin Description FUNCTION is proportional OUT SENSE RS+ 30mV 10mV ...

Page 6

... Table 1). Total gain = 25V/V for the OUT MAX9938T, 50V/V for the MAX9938F, 100V/V for the MAX9938H, and 200V/V for the MAX9938W. The output is protected from input overdrive by use of an output current limiting circuit of 7mA (typical) and a 6V clamp protection circuit. ...

Page 7

... OS regulator, can cause high-frequency differential sense = 500μV (max) OS voltages to occur at the inputs of the MAX9938, although the signal of interest is the average DC value. Such high- frequency differential sense voltages may result in a volt- ± (gain age offset at the MAX9938 output ...

Page 8

... UCSP/SOT23, Precision Current-Sense Amplifier The MAX9938 allows two methods of filtering to help improve performance in the presence of input common- mode voltage and input differential voltage transients. Figure 1 shows a differential input filter. The capacitor CIN between RS+ and RS- along with the resistor RIN between the sense resistor and RS- helps filter against input differential voltages and prevents them from reaching the MAX9938 ...

Page 9

... Application Note 1891: Wafer-Level Packaging (WLP) and Its Applications available on Maxim’s website at ic.com/ucsp. SENSE RS- RS MAX9938 OUT R 10kΩ OUT GND PROCESS: BiCMOS www.maxim- TO WALL-CUBE/ CHARGER RS- LOAD 3.3V MAX9938 DD OUT μC ADC ADC Chip Information 9 ...

Page 10

... Precision Current-Sense Amplifier For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status ...

Page 11

... Precision Current-Sense Amplifier For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status ...

Page 12

... Precision Current-Sense Amplifier For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status ...

Page 13

... Precision Current-Sense Amplifier For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status ...

Page 14

... DESCRIPTION Initial release Added μDFN package information Added G45 designation to part number Added Input Filters section and MAX9938W to the data sheet Updated EC table and Input Filters section Removed Power-Up Time parameter Corrected error on Figure 2 Maxim is a registered trademark of Maxim Integrated Products, Inc. ...

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