L79 datasheet(10/28 Pages) STMICROELECTRONICS

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Electrical characteristics

L79

10/28

DocID2149 Rev 22

Refer to the test circuits, TJ = 0 to 125 °C, VI = -19 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF

unless otherwise specified.

Table 7. Electrical characteristics of L7912AC

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

TJ = 25°C

-11.75

-12

-12.25

Output voltage

IO = -5 mA to -1 A, PO ≤ 15 W

VI = -15.5 to -27 V

-11.5

-12

-12.5

ΔVO(1)

Line regulation

VI = -14.5 to -30 V, TJ = 25°C

240

VI = -16 to -22 V, TJ = 25°C

120

ΔVO(1)

Load regulation

IO = 5 mA to 1.5 A, TJ = 25°C

240

IO = 250 to 750 mA, TJ = 25°C

120

Quiescent current

TJ = 25°C

ΔId

Quiescent current change

IO = 5 mA to 1 A

0.5

VI = -15 to -30 V

ΔVO/ΔT Output voltage drift

IO = 5 mA

-0.8

mV/°C

Output noise voltage

B = 10 Hz to 100 kHz, TJ = 25°C

200

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

Iscp

Short circuit peak current

TJ = 25°C

2.5

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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