L7809AB datasheet(12/57 Pages) STMICROELECTRONICS

12 / 57 page

Electrical characteristics

L78xx, L78xxC, L78xxAB, L78xxAC

12/57

DocID2143 Rev 31

VI = 14 V, IO = 1 A, TJ = 0 to 125 °C (L7808AC), TJ = -40 to 125 °C (L7808AB), unless

otherwise specified.

Table 7. Electrical characteristics of L7808A

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

TJ = 25°C

7.84

8.16

Output voltage

IO = 5 mA to 1 A, VI = 10.6 to 21 V

7.7

8.3

Output voltage

IO = 1 A, VI = 21 to 23 V, TJ = 25°C

7.7

8.3

V

(1)

Line regulation

VI = 10.6 to 25 V, IO = 500 mA,

TJ = 25°C

VI = 11 to 17 V

VI = 11 to 17 V, TJ = 25°C

VI = 10.4 to 23 V, TJ = 25°C

V

(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

4.3

6mA

I

Quiescent current change

VI = 11 to 23 V, IO = 500 mA

0.8

VI = 10.6 to 23 V, TJ = 25°C

0.8

IO = 5 mA to 1 A

0.5

SVR

Supply voltage rejection

VI = 11.5 to 21.5 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

V

O/T

Output voltage drift

-0.8

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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