L79 datasheet(9/28 Pages) STMICROELECTRONICS

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L79

Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, VI = -14 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF

unless otherwise specified.

Table 6. Electrical characteristics of L7908C

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

TJ = 25°C

-7.7

-8

-8.3

Output voltage

IO = -5 mA to -1 A, PO ≤ 15 W

VI = -11.5 to -23 V

-7.6

-8

-8.4

ΔVO(1)

Line regulation

VI = -10.5 to -25 V, TJ = 25°C

160

VI = -11 to -17 V, TJ = 25°C

ΔVO(1)

Load regulation

IO = 5 mA to 1.5 A, TJ = 25°C

160

IO = 250 to 750 mA, TJ = 25°C

Quiescent current

TJ = 25°C

ΔId

Quiescent current change

IO = 5 mA to 1 A

0.5

VI = -11.5 to -25 V

ΔVO/ΔT Output voltage drift

IO = 5 mA

-0.6

mV/°C

Output noise voltage

B = 10 Hz to 100 kHz, TJ = 25°C

175

µV

SVR

Supply voltage rejection

ΔVI = 10 V, f = 120 Hz

Dropout voltage

IO = 1 A, TJ = 25°C, ΔVO = 100 mV

1.1

Isc

Short circuit current

1.5

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 cycle is used.

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