Figure 5. Delay time and VOUT ramp-up time

0

2

4

6

8

10

12

Time

En/fault

VOUT

delay

time

ramp -up

time

AMG300320171104MT

6.8

En/fault pin

The En/fault pin has the dual function to control the output of the device and, at the same time, provide the

application with information about the device status.

When it is used as a standard enable pin, it should be connected to an external open-drain or open-collector

device. In this case, when it is pulled to low logic level, it turns the output of the E-Fuse off.

If this pin is left floating, since it has an internal pull-up circuitry, the output of the E-Fuse is kept on, in normal

operating conditions.

In case of thermal fault, the pin is pulled to an intermediate state (Figure 6. En/fault pin status). This signal can

be provided to a monitor circuit, informing it that a thermal shutdown has occurred, or it can be directly connected

to the Enable/fault pin of the other STEFxx devices on the same application in order to achieve a simultaneous

enable/disable feature.

When a thermal fault occurs, the device can be reset either by cycling the supply voltage or by pulling down the

Enable pin below the VIL threshold and then releasing it.

Figure 6. En/fault pin status

STEF12E

En/fault pin

DS12800 - Rev 2

page 8/19