Datasheet

ADP2386 Data Sheet
Rev. A | Page 14 of 24
OVERVOLTAGE PROTECTION (OVP)
The ADP2386 includes an overvoltage protection feature
to protect the regulator against an output short to a higher
voltage supply or when a strong load disconnect transient
occurs. If the feedback voltage increases to 0.7 V, the internal
high-side and low-side MOSFET
s are turned off until the
voltage at the FB pin decreases to 0.63 V. At that time, the
ADP2386 resumes normal operation.
UNDERVOLTAGE LOCKOUT (UVLO)
Undervoltage lockout circuitry is integrated in the ADP2386 to
prevent the occurrence of power-on glitches. If the V
PVIN
voltage
falls to less than 3.8 V typical, the part shuts down, and both the
power switch and synchronous rectifier turn off. When the
V
PVIN
voltage rises to greater than 4.3 V typical, the soft start
period is initiated, and the part is enabled.
THERMAL SHUTDOWN
If the ADP2386 junction temperatures rises to greater than 150°C,
the internal thermal shutdown circuit turns off the regulator for
self-protection. Extreme junction temperatures can be the result of
high current operation, poor circuit board thermal design,
and/or high ambient temperature. A 25°C hysteresis is included
in the thermal shut-down circuit so that, if an overtemperature
event occurs, the ADP2386 does not return to normal operation
until the on-chip temperature falls to less than 125°C. Upon
recovery, a soft start is initiated before normal operation begins.