R5973D datasheet(14/39 Pages) STMICROELECTRONICS

Part #	R5973D

Description	Up to 2 A step-down switching regulator for aerospace applications

PDF	39 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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14 / 39 page

Functional description

R5973D

14/39

DocID026876 Rev 1

5.7

Inhibit function

The inhibit feature is used to put the device in standby mode. With the INH pin higher than

2.2 V the device is disabled and the power consumption is reduced to less than 100 µA.

With the 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.

5.8

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 ± 10 °C). The sensing element of

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

detection. A hysteresis of approximately 20 °C keeps the device from turning ON and OFF

continuously.

R5973D Datasheet(PDF) 14 Page - STMicroelectronics