Data Sheet

L78LxxAB, L78LxxAC, L78LxxC Electrical characteristics
Doc ID 2145 Rev 21 15/33
T
J
= 0 to 125 °C for L78L18AC, T
J
= -40 to 125 °C for L78L18AB.
T
J
= 0 to 125 °C for L78L24AC, T
J
= -40 to 125 °C for L78L24AB.
Table 21. Electrical characteristics of L78L18AC (V
I
= 27 V)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25 °C 17.3 18 18.7 V
V
O
Output voltage
I
O
= 1 to 40 mA, V
I
= 22 to 33 V 17.1 18.9
V
I
O
= 1 to 70 mA, V
I
= 27 V 17.1 18.9
ΔV
O
Line regulation
V
I
= 22 to 33 V, T
J
= 25 °C 320
mV
V
I
= 22 to 33 V, T
J
= 25 °C 270
ΔV
O
Load regulation
I
O
= 1 to 100 mA, T
J
= 25 °C 170
mV
I
O
= 1 to 40 mA, T
J
= 25 °C 85
I
d
Quiescent current
T
J
= 25 °C 6.5 mA
T
J
= 125 °C 6 mA
ΔI
d
Quiescent current change
I
O
= 1 to 40 mA 0.1
mA
V
I
= 23 to 33 V 1.5
eN Output noise voltage B =10 Hz to 100 kHz, T
J
= 25 °C 120 µV
SVR Supply voltage rejection
V
I
= 23 to 33 V, f = 120 Hz
I
O
= 40 mA, T
J
= 25 °C
33 38 dB
V
d
Dropout voltage 1.7 V
Table 22. Electrical characteristics of L78L24AB and L78L24AC (V
I
= 33 V)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
O
Output voltage T
J
= 25 °C 23 24 25 V
V
O
Output voltage
I
O
= 1 to 40 mA, V
I
= 27 to 38 V 22.8 25.2
V
I
O
= 1 to 70 mA, V
I
= 33 V 22.8 25.2
ΔV
O
Line regulation
V
I
= 27 to 38 V, T
J
= 25 °C 350
mV
V
I
= 28 to 38 V, T
J
= 25 °C 300
ΔV
O
Load regulation
I
O
= 1 to 100 mA, T
J
= 25 °C 200
mV
I
O
= 1 to 40 mA, T
J
= 25 °C 100
I
d
Quiescent current
T
J
= 25 °C 6.5 mA
T
J
= 125 °C 6 mA
ΔI
d
Quiescent current change
I
O
= 1 to 40 mA 0.1
mA
V
I
= 28 to 38 V 1.5
eN Output noise voltage B =10 Hz to 100 kHz, T
J
= 25 °C 200 µV
SVR Supply voltage rejection
V
I
= 29 to 33 V, f = 120 Hz
I
O
= 40 mA, T
J
= 25 °C
31 37 dB
V
d
Dropout voltage 1.7 V