TLE42994 Datasheet, PDF (18/30 Pages) Infineon Technologies AG – Low Dropout Fixed Voltage Regulator

TLE42994
Block Description and Electrical Characteristics
5.6
Enable Function (only TLE42994GM and TLE42994E)
Electrical Characteristics Voltage Regulator
V_I = 13.5 V, -40 °C ≤ T_j ≤150 °C, all voltages with respect to ground, positive current flowing into pin
(unless otherwise specified)
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
5.6.1
5.6.2
5.6.3
5.6.4
Enable OFF Voltage Range
Enable ON Voltage Range
Enable OFF Input Current
Enable ON Input Current
V_EN,OFF –
V_EN,ON 3.5
I_EN,OFF
–
I_EN,ON
–
–
0.8
V
–
–
V
0.5 2
µA
3
5
µA
–
–
V_EN = 0 V
V_EN = 5 V
5.7
Reset Function
The reset function provides several features:
Output Undervoltage Reset:
An output undervoltage condition is indicated by setting the Reset Output RO to “low”. This signal might be used
to reset a microcontroller during low supply voltage.
Power-On Reset Delay Time:
The power-on reset delay time t_rd allows a microcontoller and oscillator to start up. This delay time is the time frame
from exceeding the reset switching threshold V_RT until the reset is released by switching the reset output “RO” from
“low” to “high”. The power-on reset delay time t_rd is defined by an external delay capacitor C_D connected to pin D
charged by the delay capacitor charge current I_D,ch starting from V_D = 0 V.
If the application needs a power-on reset delay time t_rd different from the value given in Item 5.7.8, the delay
capacitor’s value can be derived from the specified values in Item 5.7.8 and the desired power-on delay time:
C_D
=
t--_{r--d---,--n---e--w-- × 100nF}
t_rd
with
• C_D: capacitance of the delay capacitor to be chosen
• t_rd,new: desired power-on reset delay time
• t_rd: power-on reset delay time specified in this datasheet
For a precise calculation also take the delay capacitor’s tolerance into consideration.
Data Sheet
18
Rev. 1.1, 2009-05-19