TLF50211EL_15 Datasheet, PDF (19/27 Pages) Marl International Limited – 2.2 MHz Step-Down Regulator 500 mA, 5 V, low quiescent current

TLF50211EL
6
Enable and Thermal Shutdown
6.1
Description
Enable and Thermal Shutdown
A valid high level at pin EN (V_EN,hi) turns the regulator on, a valid low level at pin EN (V_EN,lo) turns the regulator off.
In off state the current consumption of the device is less than 2µA. An integrated pull down resistor at pin EN
(R_EN,INT) ensures, that the device is switched off, if pin EN is left open.
The integrated thermal shutdown function turns off the power switch in case of overtemperature. The typ. junction
shutdown temperature is 175°C, with a min. of 155°C. After cooling down, the IC will automatically restart with a
soft start into normal 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 +150 °C, all voltages with respect to ground (unless otherwise specified)
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
Enable EN
6.2.1
6.2.2
Current consumption, shut I_q,OFF
–
down mode
Current consumption of V_CC I_{q,ON,V_CC} –
0.1
2
–
60
µA
V_EN = 0V;
T_j < 105°C; V_S = 16V
µA
V_EN = 5.0V; V_S = 16V;
V_CC = 5.4V;
T_j < 105°C;
PFM mode
6.2.3 Current consumption of V_S I_{q,ON,V_S} –
15
20
µA
V_EN = 5.0V; V_S = 16V;
V_CC = 5.4V;
T_j < 105°C;
PFM mode
6.2.4 Enable high signal valid
V_EN,hi
3.0
6.2.5 Enable low signal valid
V_EN,lo
–
6.2.6 Enable hysteresis
V_EN,HY
50
6.2.7 Enable high input current I_EN,hi
–
6.2.8 Enable low input current I_EN,lo
–
6.2.9 Enable, internal resistor to R_EN,INT 7
GND
–
–
V
–
–
0.8
V
–
200 400 mV –
–
3
0.1
1
12
20
µA
V_EN = 16V
µA
V_EN = 0.5V
ΜΩ V_EN = 3V
Internal Over Temperature Protection
6.2.10 Over temperature shutdown T_j,sd
155 175 195 °C
1)
6.2.11 Over temperature shutdown T_{j,sd_hyst} -
15
–
K
1)
hysteresis
1) Specified by design. Not subject to production test.
Data Sheet
19
Rev. 1.0, 2013-06-19