TLE4253 Datasheet, PDF (15/22 Pages) Infineon Technologies AG – Low Dropout Voltage Tracking Regulator

TLE4253
Electrical Characteristics
5.3
Adjust / Enable Input
In order to reduce the quiescent current to a minimum, the TLE4253 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 resistor 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; -40 °C ≤ T_j ≤ 150 °C;
all voltages with respect to ground (unless otherwise specified).
Pos. Parameter
Symbol
Limit Values
Min. Typ. Max.
5.3.1 Adjust / Enable
Low Signal Valid
V_ADJ/EN,low
–
–
0.4
5.3.2
5.3.3
5.3.4
Adjust / Enable
High Signal Valid
(Tracking Region)
Adjust / Enable
Input Current
Adjust / Enable
internal pull-down resistor
V 2 _ADJ/EN,high
I_ADJ/EN
–
R_ADJ/EN
1
–
–
3.8 5.5
1.5 2
Unit
V
V
µA
MΩ
Test Condition
V_Q = 0 V;
I_I < 2 µA;
T_j ≤ 85 °C
V_Q settled:
|V_Q - V_ADJ/EN| < 10 mV;
I_Q = 10 mA
V_ADJ/EN = 5 V;
Typical Performance Characteristics Tracking Regulator
V_ADJ/EN = 5 V; V_FB = V_Q (unless otherwise noted)
Startup Sequence
4253_startup.vsd
V [V]
Overshoot depends on
load current, C_Q , ESR (C_Q )
4
V
ADJ
3
2
1
d V_Q / dt =
( I_Q,max-I_Load ) / C_Q
0 20 40 60 80 100 120 140
t [µs]
Data Sheet
15
Rev. 1.2, 2009-11-09