FDMS7578 datasheet(19/32 Pages) AD

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Data Sheet

ADP2325

Rev. 0 | Page 19 of 32

POWER GOOD

The power-good (PGOODx) pin is an active high, open-drain

output that indicates whether the regulator output voltage is

within regulation. Logic high indicates that the voltage at the

FBx pin (and, therefore, the output voltage) is above 90% of the

reference voltage. Logic low indicates that the voltage at the FBx

pin (and, therefore, the output voltage) is below 85% of the

reference voltage. There is a 16-cycle deglitch time between FBx

and PGOODx.

OVERVOLTAGE PROTECTION

The ADP2325 provides an OVP feature to protect the system

against an output shorting to a higher voltage supply or for

when a strong load transient occurs. If the feedback voltage

increases to 0.7 V, the internal high-side MOSFET and low-side

driver turn off until the voltage at the FBx pin is reduced to

0.63 V, at which time the ADP2325 resumes normal operation.

UNDERVOLTAGE LOCKOUT

The UVLO threshold is 4.2 V with 0.5 V hysteresis to prevent

power-on glitches on the device. When the PVIN1 or PVIN2

voltage rises above 4.2 V, Channel 1 or Channel 2 is enabled and the

soft start period initiates. When either PVIN1 or PVIN2 drops

below 3.7 V, it turns off Channel 1 or Channel 2, respectively.

THERMAL SHUTDOWN

In the event that the ADP2325 junction temperature exceeds

150°C, the thermal shutdown circuit turns off the regulator. A

15°C hysteresis is included so that the ADP2325 does not recover

from thermal shutdown until the on-chip temperature drops

below 135°C. Upon recovery, soft start initiates prior to normal

operation.

FDMS7578 Datenblatt(PDF) 19 Page - Analog Devices