L7809AB datasheet(14/56 Pages) STMICROELECTRONICS

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Electrical characteristics

L78xx, L78xxC, L78xxAB, L78xxAC

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Doc ID 2143 Rev 22

VI = 19 V, IO = 1 A, TJ = 0 to 125 °C (L7812AC), TJ = -40 to 125 °C (L7812AB), unless

otherwise specified.

Table 9.

Electrical characteristics of L7812A

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

TJ = 25°C

11.75

12.25

Output voltage

IO = 5 mA to 1 A, VI = 14.8 to 25 V

11.5

12.5

Output voltage

IO = 1 A, VI = 25 to 27 V, TJ = 25°C

11.5

12.5

ΔV

(1)

Line regulation

VI = 14.8 to 30 V, IO = 500 mA

120

VI = 16 to 12 V

120

VI = 16 to 12 V, TJ = 25°C

VI = 14.5 to 27 V, TJ = 25°C

120

ΔV

(1)

Load regulation

IO = 5 mA to 1 A

100

IO = 5 mA to 1.5 A, TJ = 25°C

100

IO = 250 to 750 mA

Quiescent current

TJ = 25°C

4.4

6mA

ΔI

Quiescent current change

VI = 15 to 30 V, IO = 500 mA

0.8

VI = 14.8 to 27 V, TJ = 25°C

0.8

IO = 5 mA to 1 A

0.5

SVR

Supply voltage rejection

VI = 15 to 25 V, f = 120 Hz, IO = 500 mA

Dropout voltage

IO = 1 A, TJ = 25°C

Output noise voltage

TA = 25°C, B = 10 Hz to 100 kHz

µV/VO

Output resistance

f = 1 kHz

Isc

Short circuit current

VI = 35 V, TA = 25°C

0.2

Iscp

Short circuit peak current

TJ = 25°C

2.2

ΔV

O/ΔT

Output voltage drift

-1

mV/°C

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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