Data Sheet

LM79XX
9
Electrical Characteristics (LM7918) (Continued)
(V
I
= -27V, I
O
= 500mA, 0°C ≤T
J
≤ +125°C, C
I
=2.2μF, C
O
=1μF, unless otherwise specified.)
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage V
O
T
J
= +25°C -17.3 -18 -18.7
V
I
O
= 5mA to 1A, P
O
≤ 15W
V
I
= -22.5V to -33V
-17.1 -18 -18.9
Line Regulation (Note1) ΔV
O
T
J
= +25°C
V
I
= -21V to -33V - 15 360
mV
V
I
= -24V to -30V - 8 180
Load Regulation (Note1) ΔV
O
T
J
= +25°C
I
O
= 5mA to 1.5A
-15360
mV
T
J
= +25°C
I
O
= 250mA to 750mA
-5180
Quiescent Current I
Q
T
J
= +25°C-36mA
Quiescent Current Change ΔI
Q
I
O
= 5mA to 1A - 0.05 0.5
mA
V
I
= -21V to -33V - 0.1 1
Temperature Coefficient of V
D
ΔVo/ΔTI
O
= 5mA - -1 - mV/°C
Output Noise Voltage V
N
f = 10Hz to 100kHz
T
A
= +25°C
-300- μV
Ripple Rejection RR
f = 120Hz
ΔV
I
= 10V
54 60 - dB
Dropout Voltage V
D
T
J
= +25°C
I
O
= 1A
-2- V
Short Circuit Current I
SC
T
J
= +25°C, V
I
= -35V - 300 - mA
Peak Current I
PK
T
J
= +25°C-2.2-A