Datasheet

Data Sheet 10 Rev. 1.1, 2011-07-08
IFX91041
Module Enable and Thermal Shutdown
6 Module Enable and Thermal Shutdown
6.1 Description
With the enable pin the device can be set in off-state reducing the current consumption to less than 2µA.
The enable function features an integrated pull down resistor which ensures that the IC is shut down and the power
switch is off in case the pin EN is left open.
The integrated thermal shutdown function turns the power switch off in case of overtemperature. The typ. junction
shutdown temperature is 175°C, with a min. of 160°C. After cooling down the IC will automatically restart
operation. The thermal shutdown is an integrated protection function designed to prevent IC destruction when
operating under fault conditions. It should not be used for normal operation.
6.2 Electrical Characteristics Module Enable, Bias and Thermal Shutdown
Electrical Characteristics: Enable, Bias and Thermal Shutdown
V
S
= 6.0 V to 40 V, T
j
= -40 °C to +125°C, all voltages with respect to ground (unless otherwise specified)
Pos. Parameter Symbol Limit Values Unit Conditions
Min. Typ. Max.
6.2.1 Current Consumption,
shut down mode
I
q,OFF
–0.12µAV
EN
= 0.8V;
T
j
< 105°C; V
S
= 16V
6.2.2 Current Consumption,
active mode
I
q,ON
––7mAV
EN
= 5.0V; I
CC
= 0mA;
V
S
= 16V
FB connected to
V
OUT
6.2.3 Current Consumption,
active mode
I
q,ON
––10mAV
EN
= 5.0V; I
CC
= 1.8A;
V
S
= 16V
FB connected to
V
OUT
1)
6.2.4 Enable high signal valid V
EN,lo
3.0 – – V –
6.2.5 Enable low signal valid
V
EN,hi
––0.8V–
6.2.6 Enable hysteresis
V
EN,HY
50 200 400 mV
1)
1) Specified by design. Not subject to production test.
6.2.7 Enable high input current I
EN,hi
––30µAV
EN
= 16V
6.2.8 Enable low input current
I
EN,lo
–0.11µAV
EN
= 0.5V
6.2.9 Over temperature shutdown
T
j,sd
160 175 190 °C
1)
6.2.10 Over temperature shutdown
hysteresis
T
j,sd_hyst
–15–K
1)