Datasheet

Electrical characteristics L7985
6/44 DocID022446 Rev 8
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
VV
CCON
Turn 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
Error amplifier
V
CH
High level output voltage V
FB
< 0.6 V 3
V
V
CL
Low level output voltage V
FB
> 0.6 V 0.1
I
O SOURCE
Source COMP pin V
FB
= 0.5 V, V
COMP
= 1 V 19 mA