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STEF4S
Typical characteristics
22
5.1
Operating modes
5.1.1
Turn-on
When the input voltage is applied and the EN pin is high, the output voltage is supplied with
a slope defined by the internal dv/dt circuitry. If no additional capacitor is connected to CSS
pin, the total time from the enable signal going high and the output voltage reaching the
nominal value is around 0.6 ms.
5.1.2
Normal operating condition
The STEF4S E-fuse behaves like a mechanical fuse, buffering the circuitry on its output with
the same voltage shown at its input, apart from a small voltage fall due to the MOSFET
RDS(on).
5.1.3
Output voltage clamp
The internal voltage clamp circuit clamps the output voltage to the VClamp values reported in
Table 5 if the input voltage exceeds the typical thresholds of 3.8 V in the 3.3 V mode and 5.7
V in the 5 V mode.
5.1.4
Current limiting
When an overload event occurs, the current limiting circuit reduces the conductivity of the
power MOSFET, in order to clamp the input current at the pre-programmed value. The
current limit circuit has a foldback characteristic to reduce the power dissipation over the
power MOSFET in short-circuit condition.
5.1.5
Thermal shutdown and auto-retry function
If the device temperature exceeds the thermal shutdown threshold, typically 140 °C, the
thermal shutdown circuitry turns the power MOSFET off and disconnects the load. Once the
die temperature has decreased about 20 °C the device automatically attempts to apply
again the power to the load (auto-retry). This cycle persists until the fault condition is
removed.
5.2
Startup time and CSS calculation
Connecting a capacitor between the CSS pin and GND allows the modification of the output
voltage startup time.The startup time (Tss) is defined as the time interval between the device
UVLO threshold, which has been overcome, and VOUT , which has reached 90% of the
nominal value as shown in Figure 4.
The below Table 6 shows the typical startup time obtained with the industry-standard values
of CSS.
Table 6. Startup time vs. Css capacitor value
Parameter
Value
Css [nF]
None
10
47
100
Tss [ms]
0.6
2.3
10.8
23


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