ST890

Maximum rating

9/20

2.1

Functional description

2.1.1

Output current limit

2.1.2

Output short circuit protection

The ST890 provides short circuit protection by limiting the output current during a short

circuit event.

When the output is short circuit, the Fault pin is asserted.

2.1.3

SET pin (pin 5).

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:

–

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