MAX9610 Maxim, MAX9610 Datasheet - Page 7

• Manufacturer Part Number: MAX9610
• Description: The MAX9610 high-side current-sense amplifier offers precision accuracy specifications of VOS less than 500µV (max) and gain error less than 0
• Manufacturer: Maxim

Because of the high currents that flow through R
take care to eliminate parasitic trace resistance from
causing errors in the sense voltage. Either use a four
terminal current-sense resistor or use Kelvin (force and
sense) PCB layout techniques.
When designing a system that uses a sample and hold
stage in the analog-to-digital converter, the sampling
capacitor momentarily loads OUT and causes a drop in
the output voltage. If sampling time is very short (less
than a microsecond), consider using a ceramic capaci-
tor across OUT and GND to hold V
sampling. This also decreases the small-signal band-
width of the current-sense amplifier and reduces noise
at OUT.
Figure 1. Bidirectional Application
V
BATT
= 1.6V TO 5.5V
Optional Output Filter Capacitor
_______________________________________________________________________________________
R
OUT
1µA, µDFN/SC70, Lithium-Ion Battery,
P
I
LOAD
GND
R
1
Precision Current-Sense Amplifier
Kelvin Connections
OUT
RS+
R
SENSE
MAX9610
constant during
R
1
RS-
SENSE
OUT
,
R
OUT
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 yield an accurate measure of the charge and
discharge currents, respectively (Figure 1).
P
GND
R
1
RS+
Typical Application Circuit
MAX9610
R
1
RS-
Bidirectional Application
OUT
V
DD
= 3.3V
CONTROLLER
LOAD
MICRO-
ADC
ADC
TO WALL-CUBE/
CHARGER
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