L7809AB datasheet(10/26 Pages) STMICROELECTRONICS

10 / 26 page

Electrical characteristics

L78xxAB - L78xxAC

10/26

Table 7.

Electrical characteristics of L7809A (VI = 15 V, IO = 1 A, TJ = 0 to 150 °C (L7809AC),

TJ = -40 to 125 °C (L7809AB), unless otherwise specified)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

TJ = 25°C

8.82

9.18

Output voltage

IO = 5mA to 1A, PO ≤15W

VI = 10.6 to 23V

8.65

9.35

ΔVO (1) Line regulation

VI = 10.6 to 25V, IO = 500 mA

VI = 11 to 17V

VI = 11 to 17V, TJ = 25°C

VI = 10.4 to 23V, TJ = 25°C

ΔVO (1) Load regulation

IO = 5mA to 1A

100

IO = 5mA to 1.5A, TJ = 25°C

100

IO = 250 to 750mA

Quiescent current

TJ = 25°C

4.3

6mA

ΔIq

Quiescent current change

VI = 11 to 25V, IO = 500 mA

0.8

VI = 10.6 to 23V, TJ = 25°C

0.8

IO = 5mA to 1A

0.5

SVR

Supply voltage rejection

VI = 11.5 to 21.5V, f = 120Hz,

IO = 500mA

Dropout voltage

IO = 1A, TJ = 25°C

Output noise voltage

TA = 25°C, B =10Hz to 100kHz

µV/VO

Output resistance

f =1kHz

Isc

Short circuit current

VI = 35V, TA = 25°C

0.2

Iscp

Short circuit peak current

TJ = 25°C

2.2

ΔVO/ΔT 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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