Datasheet

Electrical characteristics L7981
6/44 Doc ID 15182 Rev 3
4 Electrical characteristics
T
J
=25 °C, V
CC
=12 V, unless otherwise specified.
Table 4. Electrical characteristics
Symbol Parameter Test condition
Values
Unit
Min Typ Max
V
CC
Operating input voltage
range
(1)
4.5 28
V
V
CCON
Tu r n o n V
CC
threshold
(1)
4.4
V
CCHYS
V
CC
UVLO Hysteresis
(1)
0.12 0.35
R
DSON
Mosfet on resistance
160 180
mΩ
(1)
160 250
I
LIM
Maximum limiting current 3.7 4.2 4.7 A
Oscillator
F
SW
Switching frequency
225 250 275
KHz
(1)
220 275
V
FSW
FSW pin voltage 1.254 V
D Duty Cycle 0 100 %
F
ADJ
Adjustable switching
frequency
R
FSW
=33kΩ 1000 KHz
Dynamic characteristics
V
FB
Feedback voltage 4.5V<V
CC
<28V
(1)
0.593 0.6 0.607 V
DC characteristics
I
Q
Quiescent current
Duty Cycle=0,
V
FB
=0.8V
2.4 mA
I
QST-BY
Total stand-by quiescent
current
20 30 μA
Enable
EN threshold voltage
Device OFF level 0.3
V
Device ON level 1.2
EN current EN=V
CC
7.5 10 μA
Soft-start
T
SS
Soft-start duration
FSW pin floating 7.4 8.2 9.1
ms
F
SW
=1MHz,
R
FSW
=33kΩ
2
Error amplifier