Functional description

L5973AD

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Figure 7.

Driving circuitry

4.7

Inhibit function

The inhibit feature allows to put in stand-by mode the device. With INH pin higher than 2.2 V

the device is disabled and the power consumption is reduced to less than 100

µA. With INH

pin lower than 0.8 V, the device is enabled. If the INH pin is left floating, an internal pull up

ensures that the voltage at the pin reaches the inhibit threshold and the device is disabled.

The pin is also Vcc compatible.

4.8

Thermal shutdown

The shutdown block generates a signal that turns off the power stage if the temperature of

the chip goes higher than a fixed internal threshold (150 °C). The sensing element of the

chip is very close to the PDMOS area, so ensuring an accurate and fast temperature

detection. An hysteresis of approximately 20 °C avoids that the devices turns on and off

continuously

Vgsmax

GATE

STOP

DRIVE

DRAIN

OFF

ON

PDMOS

VOUT

DRAIN

VCC

C

ESR

D00IN1133

ON/OFF

CONTROL

CLAMP

L