Ucsp applications information, Chip information, Bidirectional application – Rainbow Electronics MAX9938 User Manual
Page 8
MAX9938
1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
8
_______________________________________________________________________________________
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 1).
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 reliability
testing results, refer to the Application Note 1891:
Understanding the Basics of the Wafer-Level Chip-
Scale Package (WL-CSP)
available on Maxim’s website
Chip Information
PROCESS: BiCMOS
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
10k
Ω
10k
Ω
Figure 1. Bidirectional Application