MAX4211EEVKIT Maxim Integrated, MAX4211EEVKIT Datasheet - Page 4

• Manufacturer Part Number: MAX4211EEVKIT
• Description: Current & Power Monitors & Regulators Evaluation Kit for the MAX4211A/B/C/D/E/F
• Manufacturer: Maxim Integrated

Specifications of MAX4211EEVKIT

• Product: Power Monitors
• Supply Voltage - Max: 20 V
• Supply Voltage - Min: 5 V
• Operating Temperature Range: - 40 C to + 85 C
• Input Voltage Range: 5 V to 20 V
• Supply Current: 1100 uA

The MAX4211E features two internal comparators. In
the EV kit, circuit Comparator1 is used to detect over-
power conditions. Comparator2 is disabled but can be
configured for microcontroller reset or other comparator
applications. To access CIN2+ of Comparator2,
remove the shunt across JU3 and connect to pin 2 of
JU3. To access CIN2-, remove the shunt across JU2
and connect to the CIN2- pad. The Comparator2 output
can be accessed through pin 1 of JU1. CIN2+ can be
left connected to REF through JU3 or can be accessed
directly through pin 2 of jumper JU3.
Transient surges in power may result when the EV kit is
powered up with a capacitive load connected to the out-
put (either C5 on the MAX4211E EV kit or to the LOAD
PC board pad output). These transient conditions may
be detected as an overpower condition and prevent
MOSFET P1 from turning on. Though these transients
might not always be sufficient to trip the circuit-breaker
function, the MAX4211E possesses an INHIBIT circuit,
which can prevent such transients from being registered
as overpower conditions.
The MAX4211E EV kit features an RC network consist-
ing of resistors R6 and capacitor C7 that connects the
LOAD node to INHIBIT of the MAX4211E. During
power-up, this RC network disables the internal com-
parator providing immunity against transient events for
a period given by the equation:
MAX4211E Evaluation Kit
4
_______________________________________________________________________________________
t
INHIBIT
=
R
6
×
Internal Comparators
C
7
×
ln
0 6
∆
.
V
Power-Up
where ∆V is the voltage change at the LOAD during
power-up or due to switching between different voltage
sources.
The MAX4211E EV kit comes configured with t
approximately equal to 425µs, for an expected ∆V =
10V and a LOAD voltage settling time of 42.5µs. For
some applications, this value might be too short to sus-
pend the Comparator1 operation as power-up tran-
sients could be much slower. To adjust the inhibit time,
select a value of t
time (t
10 x t
voltage at V
criterion. Larger t
of false circuit-breaker trips, but can potentially subject
V
overpower conditions.
Also note that resistor R7 is merely an isolation resistor
with a value that does not affect t
The MAX4211E EV kit can also evaluate other versions
of the MAX4211 power-monitoring IC. The MAX4211E
IC must be removed and replaced with the desired IC.
Refer to the MAX4210/MAX4211 IC data sheet for
detailed information about the MAX4211 parts.
Depending upon your version of the MAX4211, some of
the external components may need replacement.
SOURCE
LOAD
LOAD
to longer periods of exposure to momentary
, where t
) of the LOAD voltage. Selecting t
Evaluating the MAX4211A/B/C/D/F
LOAD
INHIBIT
INHIBIT
during power-up, is a good design
LOAD
times will reduce the number
that is larger than the settling
is the time constant of rising
INHIBIT.
INHIBIT
INHIBIT
=