Functional descriptions

ST2051

4/10

Doc ID 12593 Rev 3

3

Functional descriptions

3.1

Fault-blanking

ST devices feature a 10 ms fault-blanking. Fault-blanking allows current-limit faults,

including momentary short-circuit faults that occur when hot-swapping a capacitive load,

and also ensures that no fault is issued during power-up. When a load transient causes the

device to enter current limit, an internal counter starts. If the load fault persists beyond the

10 ms fault-blanking timeout, the FAULT output asserts low. Load-transient faults less than

10 ms (typical) will not cause a FAULT output assertion. Only current-limit faults are blanked.

Die overtemperature faults and input voltage drops below the undervoltage lock out (UVLO)

threshold will cause an immediate fault output.

3.2

Overcurrent/overtemperature protection

In overcurrent or short-circuit condition, the switch limits the current at 500 mA.

If temperature of die goes above limit value, the switch turns OFF.

3.3

Undervoltage lock out (UVLO)

When input voltage drops below critical value, the power switch turns OFF to prevent

improper operation due to low voltage.

Obsolete

Product(s)

- Obsolete

Product(s)