MAX9938 Maxim, MAX9938 Datasheet - Page 9

• 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

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).
Figure 3. Bidirectional Application
V
BATT
= 1.6V TO 28V
_______________________________________________________________________________________
R
OUT
Bidirectional Application
I
LOAD
P
10kΩ
GND
RS+
R
1
Precision Current-Sense Amplifier
R
SENSE
R
1
MAX9938
RS-
1µA, 4-Bump UCSP/SOT23,
OUT
R
OUT
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
ic.com/ucsp.
PROCESS: BiCMOS
P
10kΩ
GND
RS+
R
1
UCSP Applications Information
R
1
MAX9938
RS-
OUT
Chip Information
V
DD
LOAD
= 3.3V
ADC
ADC
μC
TO WALL-CUBE/
CHARGER
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