ADP2503/ADP2504

Data Sheet

Rev. D | Page 12 of 16

UNDERVOLTAGE LOCKOUT

The undervoltage lockout circuit prevents the device from oper-

ating incorrectly at low input voltages. It prevents the converter

from turning on the power switches under undefined conditions

and, therefore, prevents deep discharge of the battery supply.

disabled until the supply exceeds the UVLO rising threshold.

THERMAL SHUTDOWN

the device goes into thermal shutdown. In this mode, the power

switches are turned off. The device resumes operation when the

junction temperature again falls below 125°C typical.

SHORT-CIRCUIT PROTECTION

When the nominal inductor peak current value of 1.5 A is

reached, the ADP2503/ADP2504 first switch off the NMOS2

transistor if it is active. If the current thereafter continues to

increase by an extra amount of 200 mA, the PMOS1 transistor

is also switched off. This operation is reversible when the short

circuit stops. It allows the inductor current ripple to be mini-

even if a high load current is maintained after the short circuit.

REVERSE CURRENT LIMIT

expected, the inductor current becomes negative (reverse

current). The negative peak value is limited to 1.1 A by

deactivating the PMOS2 switch.