Datasheet

Electrical characteristics L78Sxx, L78SxxC
20/39 Doc ID 2148 Rev 7
Refer to the test circuits, T
J
= 25 °C, V
I
= 26 V, I
O
= 500 mA, unless otherwise specified.
Table 18. Electrical characteristics of L78S18C
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage 17.1 18 18.9 V
V
O
Output voltage I
O
= 1 A, V
I
= 20.5 V 17 18 19 V
ΔV
O
Line regulation
V
I
= 20.5 to 30 V 360
mV
V
I
= 22 to 28 V 180
ΔV
O
Load regulation
I
O
= 20 mA to 1.5 A 360
mV
I
O
= 2 A 200
I
Q
Quiescent current 8 mA
ΔI
Q
Quiescent current change
I
O
= 20 mA to 1 A 0.5
mA
V
I
= 20.5 to 30 V, I
O
= 20 mA 1
ΔV
O
/ΔT Output voltage drift I
O
= 5 mA, T
J
= 0 °C to 70 °C -1 mV/°C
eN Output noise voltage B =10 Hz to 100 kHz 110 µV
SVR Supply voltage rejection f = 120 Hz 43 dB
V
I
Operating input voltage I
O
≤ 1 A 21 V
R
O
Output resistance f = 1 kHz 22 mΩ
I
sc
Short circuit current V
I
= 27 V 500 mA
I
scp
Short circuit peak current 3 A