LM79XX

4

Electrical Characteristics (LM7908) (Continued)

(VI = -14V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)

Note

1. Load and line regulation are specified at constant junction temperature. Changes in VO 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

VO

TJ = +25°C

-7.7-8-8.3

V

IO = 5mA to 1A, PO ≤ 15W

VI = -10V to -23V

-7.6

-8

-8.4

Line Regulation (Note1)

ΔVO

TJ = +25°C

VI = -10.5V to -25V

-

10

160

mV

VI = -11V to -17V

-

5

80

Load Regulation (Note1)

ΔVO

TJ = +25°C

IO = 5mA to 1.5A

-12

160

mV

TJ =+25°C

IO = 250mA to 750mA

-4

80

Quiescent Current

IQ

TJ =+25°C-

3

6

mA

Quiescent Current Change

ΔIQ

IO = 5mA to 1A

-

0.05

0.5

mA

VI = -10.5V to -25V

-

0.1

1

Temperature Coefficient of VD

ΔVo/ΔTIO = 5mA

-

-0.6

-

mV/

°C

Output Noise Voltage

VN

f = 10Hz to 100kHz

TA =+25°C

-175

-

μV

Ripple Rejection

RR

f = 120Hz

ΔVI = 10V

54

60

-

dB

Dropout Voltage

VD

TJ = +25°C

IO = 1A

-2

-

V

Short Circuit Current

ISC

TJ = +25°C, VI = -35V

-

300

-

mA

Peak Current

IPK

TJ = +25°C-

2.2

-

A