XRP2523EVB Exar, XRP2523EVB Datasheet - Page 7

• Manufacturer Part Number: XRP2523EVB
• Description: Power Management IC Development Tools 1.5A Sgl Ch USB 2.0/ 3.0 Pwr Dist Sw
• Manufacturer: Exar
• Type: Power Switchesr

Specifications of XRP2523EVB

• Product: Evaluation Boards
• Tool Is For Evaluation Of: XRP2523
• Input Voltage: 3.2 V to 6.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Output Current: 1.5 A
• For Use With: XRP2523

APPLICATION INFORMATION
The XRP2523 device is a single channel
integrated high-side power distribution switch
that can be used in any self or bus powered
USB applications. It is compliant with the
latest USB 3.0 specifications. The reverse
current protection feature prevents current to
flow from OUT to IN when the device is
disabled.
I
It is important to place a 1μF ceramic bypass
capacitor from IN to GND as close as possible
to the device in order to control supply
transients. A high capacitor value can further
reduce voltage droop on the input.
Placing bulk capacitance of at least 22μF at
the
transients
conditions.
Furthermore, bypassing the output pin with a
0.1μF to 1μF ceramic capacitor placed close to
OUT and PGND improves the device response
to short-circuit transients.
E
The device is disabled when the enable pin is
in logic low condition. During this condition,
the internal circuitry and the switch are turned
off thereby reducing the supply current 0.1µA
typical. Enable must be driven logic high for a
clearly defined input. Floating the input may
cause unpredictable operation.
E
The error flag signal (FLG output pin) is an
open-drain output and is pulled low (active
low) upon detection of the following fault
conditions:
Under voltage lockout condition is flagged
immediately while the over–current, over-
temperature and short-circuit conditions are
© 2012 Exar Corporation
NPUT
NABLE
RROR




output
Over-current condition
Over-temperature condition
Short-circuit condition
Under voltage lockout condition
& O
F
C
LAG
ONTROL
UTPUT
under
pin
reduces
heavy
1
1
.
.
5
5
A
A
power
current
S
S
i
i
n
n
g
g
l
l
e
e
supply
C
C
load
h
h
a
a
n
n
7/9
n
n
e
e
l
l
reported
continuously for longer than the blanking time
of 9ms typical. The blanking time prevents
erroneous reporting of current faults due to
brief output current spikes.
Once activated, the error flag signal remains
low
removed.
C
The current limit threshold is preset internally.
It protects the output MOSFET switch from
damages resulting from undesirable short
circuit conditions or excess inrush current,
which is often encountered during hot plug-in.
The low limit of the current limit threshold of
the XRP2523 allows a minimum current of
1.6A through the MOSFET switch.
An over-current condition is detected once the
current limit threshold is exceeded, and output
current is then limited to a constant current
value. Triggering the current limit function is
signaled by the Error Flag after 9ms of
blanking time period.
U
Under-voltage lockout function (UVLO) keeps
the internal power switch from being turned
on until the power supply exceeds 2.3V
typically, even if the switch is enabled. Upon
detection
approximately 2.3V, the power switch is
turned off and a fault condition is reported by
the error flag signal.
T
Internal thermal sensing circuitry monitors the
operating temperature of the device. Upon
detection of a temperature in excess of 145°C,
the power switch is disabled preventing any
damages to the device while a fault condition
is reported by the error flag signal. A built-in
20°C hysteresis allows the device to cool down
to 125°C before resuming normal operation by
turning the switch on. At this time, the error
flag signal is cleared.
U
U
HERMAL
URRENT
NDER
S
S
B
B
until
3
3
-V
.
.
0
0
OLTAGE
L
P
only
IMIT
all
ROTECTION
P
P
of
o
o
w
w
fault
an
e
e
if
L
r
r
OCKOUT
D
D
the
input
conditions have
i
i
s
s
t
t
r
r
condition
i
i
b
b
u
u
voltage
t
t
X
X
i
i
o
o
R
R
n
n
P
P
Rev. 1.1.0
S
S
2
2
persists
w
w
5
5
below
i
i
been
t
t
2
2
c
c
3
3
h
h