XRP7720 Datasheet, PDF (20/28 Pages) Exar Corporation – Quad Output Universal Customizable PMIC with PFM

XRP7720
Quad Output Universal Customizable PMIC with PFM
for a 5V input. Therefore, setting the warning
level at 4.8V and the fault level at 4.6V may
result in the outputs not being re-enabled
until a full 5.0V is reached on Vcc. Setting the
warning level to 4.6V and the fault level at
4.4V will allow UVLO handing as desired.
However, at a fault level below 4.6V, the
device has a hardware UVLO on LDO5 to
ensure proper shutdown of the internal
circuitry of the controller. This means the
4.4V UVLO fault level will never occur.
OTP
User defined OTP warning, fault and restart
levels are set at 5°C increments in PA 5.1.
channel and perform auto-restart of the
channel, or to restart the chip.
WARNING: Choosing the “Restart Chip”
option during development is NOT
recommended as it makes debug efforts
difficult.
When the warning level is reached the
controller will assert HW Flags on GPIO0 (see
the Digital I/O section).
When an OTP fault condition occurs, the
XRP7720 outputs are shut down.
Once temperature reaches a user defined OTP
Restart Threshold level, the controller will
reset.
OVP
A user defined OVP fault level is set in PA 5.1
and is expressed in percentages of a
regulated target voltage.
In the case of shutting down the faulting
channel and auto-restarting, the user has an
option to specify startup timeout (the time in
which the fault is validated) and hiccup
timeout (the period after which the controller
will try to restart the channel) periods in 1
msec increments with a maximum value of
255 msec.
Resolution is the same as for the target
voltage (expressed in percentages). The OVP
minimum and maximum values are calculated
by the following equation where the range for
N is 1 to 63:
𝑁 ∗ 𝐿𝑆𝐵(𝑚𝑉) ∗ 10⁵
𝑂𝑉𝑃(%) = _{𝑉𝑡𝑎𝑟𝑔𝑒𝑡 (𝑉)}
When the OVP level is reached and the fault is
generated, it can be monitored through
GPIO0.
A user can choose one of three options on
how to react to an OVP event: to shutdown
the faulting channel, to shut down faulting
Note: The Channel Fault Action response is
the same for either the OVP or OCP event.
© 2014 Exar Corporation
20/28
Rev. 1.0.0