MAX9938_09 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – 1μA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier

19-4110; Rev 2; 2/09
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1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
General Description
The MAX9938 high-side current-sense amplifier offers
precision accuracy specifications of V_OS 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 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 three gain ver-
sions: 25V/V (MAX9938T), 50V/V (MAX9938F), and
100V/V (MAX9938H).
The three 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_SENSE 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
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
♦ Three Gain Versions Available
25V/V (MAX9938T)
50V/V (MAX9938F)
100V/V (MAX9938H)
♦ 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
MAX9938FEBS+G45
MAX9938HEBS+G45
MAX9938TEUK+
MAX9938FEUK+
MAX9938HEUK+
MAX9938FELT+
4 UCSP
4 UCSP
4 UCSP
5 SOT23
5 SOT23
5 SOT23
6 μDFN
25
+AGD
50
+AGE
100
+AGF
25
+AFFB
50
+AFFC
100
+AFFD
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.
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
RS+ A1
A2 RS-
MAX9938T/F/H
GND B1
B2 OUT
UCSP
DRAWINGS NOT TO SCALE
RS+
RS-
5
4
MAX9938T/F/H
1
2
3
GND
GND
OUT
SOT23
TOP VIEW
(PADS ON BOTTOM)
OUT 1
6 RS-
N.C. 2
5 N.C.
MAX9938FELT
GND 3
4 RS+
μDFN
________________________________________________________________ Maxim Integrated Products 1
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.