L78 datasheet(23/58 Pages) STMICROELECTRONICS

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Positive voltage regulator ICs

Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, VI = 26 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF

unless otherwise specified(o).

Minimum load current for regulation is 5 mA.

Table 17. Electrical characteristics of L7818C

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Output voltage

TJ = 25°C

17.3

18.7

Output voltage

IO = 5 mA to 1 A, VI = 21 to 31 V

17.1

18.9

Output voltage

IO = 1 A, VI = 31 to 33 V, TJ = 25°C

17.1

18.9

ΔVO(1)

Line regulation

VI = 21 to 33 V, TJ = 25°C

360

VI = 24 to 30 V, TJ = 25°C

180

ΔVO(1)

Load regulation

IO = 5 mA to 1.5 A, TJ = 25°C

360

IO = 250 to 750 mA, TJ = 25°C

180

Quiescent current

TJ = 25°C

ΔId

Quiescent current change

IO = 5 mA to 1 A

0.5

VI = 21 to 33 V

ΔVO/ΔT Output voltage drift

IO = 5 mA

-1

mV/°C

Output noise voltage

B = 10 Hz to 100 kHz, TJ = 25°C

110

µV/VO

SVR

Supply voltage rejection

VI = 22 to 32 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

0.20

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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