TLE4254 Datasheet, PDF (13/21 Pages) Infineon Technologies AG – High Accuracy Low Dropout Voltage Tracking Regulator

TLE4254
Electrical Characteristics
5.3
Adjust / Enable Input
In order to reduce the quiescent current to a minumum, the TLE4254 can be switched to stand-by mode by setting
the adjust/enable input “ADJ/EN” to “low”.
In case the pin “ADJ/EN is left open, an internal pull-down resistors keeps the voltage at the pin low and therefore
ensures that the regulator is switched off.
Table 3 Electrical Characteristics Adjust / Enable
V_I = 13.5 V; V_ADJ/EN ≥ 2.0 V; V_FB = V_Q (version GA / EJ A); -40 °C ≤ T_j ≤ 150 °C; C_Q = 1 µF
all voltages with respect to ground (unless otherwise specified).
Pos. Parameter
Symbol
Limit Values
Unit Test Condition
Min. Typ. Max.
5.3.16 Adjust / Enable
Low Signal Valid
5.3.17 Adjust / Enable
High Signal Valid
(Tracking Region)
V_ADJ/EN,low
–
–
0.4 V
V_Q = 0 V;
I_Q ≤ 5 µA @ T_j ≤ 125 °C
V 2 _ADJ/EN,high
–
–
V
V_Q settled
5.3.18 Adjust / Enable
Input Current
I_ADJ/EN
–
2
3
µA V_ADJ/EN = 5 V
5.3.19 Adjust / Enable
Input Current
if Input tied to GND
I_ADJ/EN
–
0.3 0.6 mA V_ADJ/EN = 5 V;
V_I = 0 V
5.3.20 Adjust / Enable
R_ADJ/EN
internal pull-down resistor
1.7 2.5 3.3 MΩ
Typical Performance Characteristics Adjust / Enable Input
Adjust / Enable Input
Current I_ADJ/EN vs. T_j
I_ADJ [µA ]
2.5
VI = 13.5 V
VADJ = 5 V
2.4
IADJ-Tj .vsd
Adjust / Enable Input
Current I_ADJ/EN vs. V_I
I_ADJ [µA]
100
Startup Sequence
V_Q vs. V_ADJ,EN
IADJ _ VI.v s d
V_Q [V]
V_I = 13.5 V
T_j = 25 °C
4
2.3
3
10
2.2
T_j = 150 °C
2
T _j = -40 °C
2.1
1
1
V Q-V A DJ.vsd
-50
0
50
100 150
T_j [°C]
0
10
20
30
40
V_I [V]
1
2
3
4
V_ADJ [V]
Data Sheet
13
Rev. 1.2, 2009-11-18