Rainbow Electronics MAX9938 - Manual

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) and 5-pin SOT23 packages,
specified for operation over the -40°C to +85°C extend-
ed 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
or 5-Pin SOT23 Package
MAX9938
1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
________________________________________________________________ Maxim Integrated Products 1
MAX9938T/F/H MAX9938T/F/H
5 4
1 3 2
RS+ RS-
GND OUT GND
SOT23
UCSP
TOP VIEW
(BUMPS ON BOTTOM)
B1 B2
A1
GND
RS+
OUT
RS- A2
Pin Configurations
19-4110; Rev 0; 4/08
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.
UCSP is a trademark of Maxim Integrated Products, Inc.
Ordering Information
+ Denotes a lead-free package.
Note: All devices are specified over the -40°C to +85°C
extended temperature range.
PART
PIN-
PACKAGE
GAIN (V/V) TOP MARK
MAX9938TEBS+ 4 UCSP 25 +AGD
MAX9938FEBS+ 4 UCSP 50 +AGE
MAX9938HEBS+ 4 UCSP 100 +AGF
MAX9938TEUK+ 5 SOT23 25 +AFFB
MAX9938FEUK+ 5 SOT23 50 +AFFC
MAX9938HEUK+ 5 SOT23 100 +AFFD