E-L5973AD Datasheet, PDF (12/22 Pages) STMicroelectronics – 2 A switch step down switching regulator

Functional description
Figure 7. Driving circuitry
Vgsmax
CLAMP GATE
STOP
DRIVE
ON/OFF
CONTROL
DRAIN
OFF
ON
D00IN1133
L5973AD
VCC
I_OFF
PDMOS
DRAIN
L
ESR
VOUT
I_LOAD
C
I_ON
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
12/22
Doc ID 9552 Rev 9