MAX4210A MAXIM [Maxim Integrated Products], MAX4210A Datasheet - Page 2

• Manufacturer Part Number: MAX4210A
• Description: MAX4210E Evaluation Kit
• Manufacturer: MAXIM [Maxim Integrated Products]

4) Set the electronic load to sink 10A.
5) Connect the electronic load’s positive terminal to the
6) Connect the positive terminal of the 5V supply to the
7) Turn on and set the 10V power supply (V
8) Turn on the 5V power supply and verify that the out-
The MAX4210E EV kit is a power monitor that uses high-
side current sensing to measure load current and pro-
vides two options for applying source voltage through an
external voltage-divider or as a direct voltage input. When
using the latter option, the source voltage may still need
to be divided down by some means to ensure that the
voltage applied to the IN input of the MAX4210 does not
exceed 1V. The full-scale load current is set at 10A and
the source voltage is allowed to swing between 10V and
20V. The EV kit monitors up to 100W of power, which is
being delivered to the load by the source voltage.
Jumper JU1 determines how the source voltage is to be
applied. Place the shunt across pins 1 and 2 of jumper
JU1 to use a divided-down source voltage. The external
resistor-divider formed by R2 and R3 provides the volt-
age division. The second option is to shunt JU1 across
pins 2 and 3, allowing the voltage applied to the VIN pad
to be used directly. In either configuration, care must be
taken not to apply a voltage greater than 1V to the IN
input of the MAX4210E. The source voltage should not
exceed 28V, the full-scale input voltage of the
MAX4210E. Applying any voltages that exceed the EV
kit’s full-scale ratings results in output voltages that are
not proportional to the power being delivered to the load.
The EV kit is shipped with the shunt placed across pins 1
and 2 of jumper JU1. See Table 1 for JU1 function.
MAX4210E Evaluation Kit
Table 1. JU1 Function
2
LOAD pad. The load’s ground should be connected
to the GND pad closest to P
V
the supply to the GND pad closest to V
10V and then activate the electronic load.
put voltage P
1–2 (default)
LOCATION
_______________________________________________________________________________________
CC
SHUNT
2–3
pad, and then connect the negative terminal of
OUT
Connected to an external resistor-divider
Connected to the VIN pad
Applying the Source Voltage
= 1.0V.
Detailed Description
OUT
IN PIN
.
CC
SOURCE
.
) to
The load current is measured as a voltage drop,
V
proper load current measurements, the sense resistor
must be chosen so that its voltage drop reaches the
recommended full-scale sense voltage of the IC. The
full-scale sense voltage should be reached when the
full-scale load current is being supplied to the load. The
external sense resistor R1 is determined by setting the
full-scale load current and selecting a full-scale sense
voltage of 100mV to 150mV:
The MAX4210E EV kit, which is assembled with the
MAX4210E, supports a full-scale sense voltage drop of
100mV, and supports a 10A full-scale load current. This
arrangement results in the use of a 10mΩ sense resistor
on the MAX4210E EV kit. For different full-scale sense
voltage and full-scale load current arrangements, the
equation above can be used to determine the appropri-
ate sense resistor value. The full-scale sense voltages of
alternate MAX4210 versions can be found in Table 2 of
the MAX4210/MAX4211 data sheet.
The output voltage provided at POUT is proportional to
the power being delivered to the load:
The voltage measured at POUT is the result of measuring
load current and source voltage and taking their product.
The load current is measured as a voltage drop, V
across the current-sense resistor and a divided-down
voltage, V
ment. The equation relating V
and source voltage measurements is given below:
where G
Refer to Table 2 in the MAX4210/MAX4211 data sheet for
the power-gain factor of different MAX4210 versions.
SENSE
V
, across an external sense resistor. To ensure
POUT
P
IN
is power gain and equals 25 (1/V):
, is taken as the source voltage measure-
V
R
∝ P
V
1 =
POUT
IN
DELIVERED
=
V
Measuring the Load Current
I
SENSE FULL SCALE
LOAD FULL SCALE
V
= G
SOURCE
P
_
_
x V
= V
SENSE



POUT
R
−
SOURCE
−
3
R
+
3
R
to the load current
x V
2
Output Power



IN
x I
LOAD
SENSE
,