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ST890 Fiches technique(PDF) 9 Page - STMicroelectronics

No de pièce ST890
Description  1.2 A current limited high side power switch with thermal shutdown
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST890 Fiches technique(HTML) 9 Page - STMicroelectronics

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ST890
Maximum rating
9/20
2.1
Functional description
2.1.1
Output current limit
ILIM is the output current that ST890 limits under the condition VO (output voltage) > 1.6 V.
When ILIM is reached, the Fault pin is asserted.
2.1.2
Output short circuit protection
The ST890 provides short circuit protection by limiting the output current during a short
circuit event.
Isc is the output short circuit current limit level (typ 1.2 x ILIM). When the output is short circuit
such as VO < 1.6 V, the ST890 limits the output current to no more than the Isc level.
When the output is short circuit, the Fault pin is asserted.
2.1.3
Programming ILIM
The ST890's ILIM can be programmed through the external resistor, RSET connected at the
SET pin (pin 5).
ILIM is determined by the following relationships:
Equation 1
Equation 2
therefore:
Equation 3
2.1.4
Fault pin
The Fault pin (pin 8) is an open drain active low output. This pin should be connected to an
external pull-up resistor.
The Fault pin is asserted low when:
–IOUT reaches the programmed ILIM value
A short circuit event occurs
The device goes into thermal protection
2.1.5
Thermal protection
The ST890's thermal protection is triggered to turn off the switch when the junction
temperature exceeds 130°C (typ).
SET
SET
SET
R
/
V
=
I
1110
=
I
/
I
SET
LIM
LIM
SET
I
/
1110
x
1.24
=
R


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