Datasheet

Data Sheet 14 Rev. 1.01, 2009-10-19
IFX21401
Electrical Characteristics
5.3 Adjust / Enable Input
In order to reduce the quiescent current to a minimum, the IFX21401MB can be switched to stand-by mode by
setting the adjust/enable input “ADJ/EN” to “low”.
Typical Performance Characteristics Adjust / Enable Input
VADJ/EN = 5V (unless otherwise noted)
Table 3 Electrical Characteristics Adjust / Enable
V
I
= 13.5 V; V
ADJ
≥ 2.5 V; -40 °C ≤ T
j
≤ 125 °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.
5.3.1 Adjust / Enable
Input Current
I
ADJ
–0.10.5µAV
ADJ
= 5 V;
5.3.2 Adjust / Enable
Low Signal Valid
V
ADJ,low
––0.4VV
Q
= 0 V;
5.3.3 Adjust / Enable
High Signal Valid
(Tracking Region)
V
ADJ,high
2.5 – 36 V |V
Q
- V
ADJ
| < 25 mV;
Startup Sequence
0
t [µs]
20 60 80 120 140
V [V]
4250-2_startup.vsd
3
2
1
4
40 100
V
ADJ
Overshoot depends on
load current, C
Q
, ESR
CQ
d V
Q
/ d t =
(
I
Q,max
- I
Load
) / C
Q