STEF4SPUR Datasheet, PDF (10/21 Pages) List of Unclassifed Manufacturers – Electronic fuse for 3.3 V and 5 V lines

Typical characteristics
STEF4S
The capacitance to be added to C_SS pin can be also estimated by using the following
theoretical formula:
Equation 1
C_SS = 4.35 × 10^–6 × Tss
The above value is not valid if C_SS is not connected. C_SS is expressed in Farad and the time
in seconds.
A ceramic low leakage capacitor is suggested for this purpose. The formula is meant as a
theoretical support to choose the C_SS capacitor and it does not take into account the
capacitor tolerance, temperature and process variations.
Figure 4. Startup time
$09
5.3
UVLO and voltage clamp selection
The device can be used either on the 3.3 V or on the 5 V lines. The operating mode can be
selected through the V_CP pin.
If this pin is set at high level (V_CP > 2 V) the operating mode is 5 V. In this mode the UVLO
threshold is 3.6 V typical, the clamping voltage is set to 5.7 V.
If the V_CP pin is pulled to low level (V_CP < 0.4 V), the operating mode is 3.3 V. In this mode
the UVLO threshold is 2.3 V typical, the clamping voltage is set to 3.8 V.
5.4
Enable pin
The EN pin is used to turn on/off the device. The device is disabled when the EN pin voltage
is lower than 0.4 V, enabled if the EN pin voltage is higher than 2 V.
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