DocID025099 Rev 2

11/25

STEF033

Typical application

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5.3

The device includes a rise-time control circuit, allowing the soft-start during turn-on and Hot-

plug of the equipment. The pre-programmed rise time, defined as the time interval during

which the output voltage goes from 10% to 90% of the nominal voltage, is typically 1.4 ms.

The STEF033 and STEF033A in DFN10 package feature a user-programmable output

modification of the output voltage ramp-up time is possible. The capacitance to be added on

5.4

Enable-Fault pin

The Enable/Fault pin has the dual function of controlling the output of the device and, at the

same time, of providing information about the device status to the application.

It can be connected to an external open-drain or open-collector device. In this case, when it

is pulled at low logic level, it will turn the output of the E-Fuse off.

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

ON in normal operating conditions.

This pin should never be biased to a voltage higher than 3.6 V.

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

be provided to a monitor circuit, signaling that a thermal shutdown has occurred, or it can be

Table 7. Typical rise time values vs. dv/dt capacitor

none

100 pF

470 pF

1 nF

1.

1.4

2.8

8

16

10%

90%

rise

time

delay

time

Enable

V

OUT