Datasheet

Electrical characteristics L7985
6/43 Doc ID 022446 Rev 3
4 Electrical characteristics
T
J
= 25 °C, V
CC
= 12 V, unless otherwise specified.
Table 4. Electrical characteristics
Symbol Parameter Test conditions
Values
Unit
Min. Typ. Max.
V
CC
Operating input voltage
range
(1)
4.5 38
V
V
CCON
Tur n on V
CC
threshold
(1)
4.5
V
CCHYS
V
CC
UVLO hysteseris
(1)
0.1 0.4
R
DSON
MOSFET on resistance
200
mΩ
(1)
400
I
LIM
Maximum limiting current 2.5 3.0 3.5 A
Oscillator
F
SW
Switching frequency
(1)
210 250 275 KHz
V
FSW
FSW pin voltage 1.254 V
D Duty cycle 0 100 %
F
ADJ
Adjustable switching
frequency
R
FSW
=33 kΩ 1000 KHz
Dynamic characteristics
V
FB
Feedback voltage
4.5 V<V
CC
<38 V 0.593 0.6 0.607
V
4.5 V<V
CC
<38 V
(1)
0.582 0.6 0.618
DC characteristics
I
Q
Quiescent current
Duty cycle=0, V
FB
=0.8
V
2.4 mA
I
QST-BY
Total standby quiescent
current
20 30 μA
Enable
V
EN
EN threshold voltage
Device OFF level 0.3
V
Device ON level 1.2
I
EN
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
=1 MHz,
R
FSW
=33 kΩ
2