MAX4080EVKIT+ Maxim Integrated Products, MAX4080EVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX4080EVKIT+
• Description: KIT EVAL FOR MAX4080
• Manufacturer: Maxim Integrated Products

Specifications of MAX4080EVKIT+

• Main Purpose: Power Management, Current Monitor: High Side
• Utilized Ic / Part: MAX4080
• Silicon Manufacturer: Maxim
• Silicon Core Number: MAX4080, MAX4081
• Kit Application Type: Amplifier
• Application Sub Type: Current-Sense Amplifier
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Before beginning, the following equipment is needed:
• One 12V, 1A power supply
• One electronic load capable of sinking 1A
• Two digital voltmeters (DVMs)
The MAX4080 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply or the
electronic load until all connections are completed.
1) MAX4081 only: Verify that a shunt is installed across
2) MAX4081 only: Verify that a shunt is installed across
3) Set the power supply to 12V and connect the posi-
4) Connect the VCC pad and the VSENSE+ pad.
5) Set the electronic load to sink 1A.
6) Connect the electronic load’s positive terminal to
7) Connect a voltmeter across the VSENSE+ and
8) Connect the second voltmeter across the VOUT
MAX4080 Evaluation Kit
Note: Indicate that you are using the MAX4080 or MAX4081
when contacting these component suppliers.
2
IRC, Inc.
TDK Corp.
SUPPLIER
pins 1-2 of jumper JU1.
pins 1-2 of jumper JU2.
tive terminal to the VCC pad. Connect the ground of
the power supply to the GND pad closest to the
VCC pad.
the VSENSE- pad. Connect the load’s ground to the
GND pad closest to the VCC pad.
VSENSE- pads. (Note that this voltmeter measure-
ment will not accurately reflect actual sense voltage
across the sense resistor due to voltage drop in the
trace and in the connectors. Accurate measurement
of sense voltage across low-value sense resistors
requires the use of 4-wire Kelvin-connected sense
resistors. The EV kit board shows one example of
good layout practice by which RS+ and RS- of the
current-sense amplifier can connect to commonly
available 2-wire sense resistors.)
pad and the closest GND pad.
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Quick Start
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Procedure
9) Turn on the power supply.
10) Turn on the electronic load.
11) Verify that the first DVM reading is approximately
12) Adjust the electronic load current to between 1A
The MAX4080 EV kit is a current-sense amplifier that
measures the load current and provides an analog volt-
age output. The full-scale V
full-scale I
replacing current-sense resistor R1 to another appropri-
ate value.
The EV kit is installed with a MAX4080SAUA, which has
a gain of 60. The current-sense-resistor value is 0.1Ω.
The V
where V
current, and A
Note: Output voltage is internally clamped not to
exceed 18V.
Normal operating V
4.5V to 76V.
The load current is measured as a voltage drop
(V
age is then amplified by the current-sense amplifier and
presented at its OUT pin. Like all differential amplifiers,
the output voltage has two components of error (an off-
set error and a gain error). The offset error affects accu-
racy of measurement at low currents and a gain error
affects output accuracy at large currents—both errors
affect accuracy of measurement at intermediate cur-
rents. By minimizing both offset and gain errors, accu-
rate measurements can be obtained from the
MAX4080/MAX4081 over a wide dynamic range.
SENSE
100mV and the second DVM is approximately 6V.
and 0A and verify that the reading of the second
DVM is about 60 times the reading of the first DVM.
Applying the V
OUT
SENSE
) across an external sense resistor. This volt-
V
SENSE
is given by:
OUT
V
is the sense voltage, I
=
is the gain of the device.
is set at 1A. They can be changed by
V
SENSE
CC
Measuring the Load Current
, V
Detailed Description
CC
SENSE+
×
Power Supply and the
A
SENSE
V
Load Power Supply
=
I
, and V
SENSE
is set to 100mV. The
SENSE
×
SENSE-
0 1 60
.
×
is the load
range is