Datasheet

MAX9938
V
BATT
= 1.6V TO 28V
R
SENSE
R
1
I
LOAD
R
OUT
R
1
GND
P
MAX9938
R
1
R
OUT
R
1
GND
P
OUT OUT
TO WALL-CUBE
/
CHARGER
MAX9938
RS+ RS-RS- RS+
ADC
ADC
LOAD
μC
V
DD
= 3.3V
10kΩ10kΩ
Figure 3. Bidirectional Application
1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
_______________________________________________________________________________________ 9
Chip Information
PROCESS: BiCMOS
Bidirectional Application
Battery-powered systems may require a precise bidi-
rectional current-sense amplifier to accurately monitor
the battery’s charge and discharge currents.
Measurements of the two separate outputs with respect
to GND yields an accurate measure of the charge and
discharge currents respectively (Figure 3).
UCSP Applications Information
For the latest application details on UCSP construction,
dimensions, tape carrier information, PCB techniques,
bump-pad layout, and recommended reflow tempera-
ture profile, as well as the latest information on reliabili-
ty testing results, refer to the Application Note 1891:
Wafer-Level Packaging (WLP) and Its Applications
available on Maxim’s website at www.maxim-
ic.com/ucsp.