LP8754_15 datasheet(23/53 Pages) TI

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LP8754

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SNVS861A – FEBRUARY 2014 – REVISED AUGUST 2014

7.3.4.2 Faults (Fault State and Fast Power Down)

7.3.4.2.1

Undervoltage Lock-out (UVLO)

When the input voltage falls below VUVLO (typ. 2.25 V) at the VDDA5V pin, the LP8754 indicates a fault by

activating the FLAGS_1.UVLO flag. The buck converter shut down without a power-down sequence (Fast Power-

Down). The flag will remain active until the input voltage is raised above the UVLO threshold. If the flag is

cleared while the fault persists, the flag is immediately re-asserted, and interrupt remains active.

7.3.4.2.2

Overvoltage Protection (OVP)

When an input voltage greater than VOVP (typ. 5.3 V) is detected at the VDDA5V pin, the LP8754 indicates a fault

by activating the FLAGS_1.OVP flag. The buck converter is shut down immediately (Fast Power-Down). The flag

will remain active until the input voltage is below the OVP threshold. If the flag is cleared while the fault persists,

the flag is immediately re-asserted and interrupt remains active.

7.3.4.2.3

Thermal Shutdown (THSD)

The LP8754 has a thermal overload protection function that operates to protect itself from short-term misuse and

overload conditions. When the junction temperature exceeds around 150°C, the device enters shutdown via fault-

state. INT will be cleared upon write of the FLAGS_1.THSD flag even when thermal shutdown is active. This

allows automatic recovery when temperature decreases below thermal shutdown level. See Figure 17 for

LP8754 thermal diagnosis and protection features.

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