L7805 datasheet(26/57 Pages) STMICROELECTRONICS

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Electrical characteristics

L78xx, L78xxC, L78xxAB, L78xxAC

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DocID2143 Rev 31

Refer to the test circuits, TJ = 0 to 125 °C, VI = 28 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF

unless otherwise specified.

Table 21. Electrical characteristics of L7820C

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

TJ = 25°C

19.2

20.8

Output voltage

IO = 5 mA to 1 A, VI = 23 to 33 V

Output voltage

IO = 1 A, VI = 33 to 35 V, TJ = 25°C

V

(1)

Line regulation

VI = 22.5 to 35 V, TJ = 25°C

400

VI = 26 to 32 V, TJ = 25°C

200

V

(1)

Load regulation

IO = 5 mA to 1.5 A, TJ = 25°C

400

IO = 250 to 750 mA, TJ = 25°C

200

Quiescent current

TJ = 25°C

I

Quiescent current change

IO = 5 mA to 1 A

0.5

VI = 23 to 35 V

V

O/T

Output voltage drift

IO = 5 mA

-1

mV/°C

Output noise voltage

B = 10 Hz to 100 kHz, TJ = 25°C

150

µV/VO

SVR

Supply voltage rejection

VI = 24 to 35 V, f = 120 Hz

Dropout voltage

IO = 1 A, TJ = 25°C

Output resistance

f = 1 kHz



Isc

Short circuit current

VI = 35 V, TJ = 25°C

0.18

Iscp

Short circuit peak current

TJ = 25°C

2.1

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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