Electrical specifications

L4938ED, L4938EPD

8/20

Doc ID 17243 Rev 2

2.2

Thermal data

Note:

Typical value soldered on a PC board with 8 cm2 copper ground plane (35 mm thick).

2.3

Electrical characteristics

VS = 14 V; Tj = -40 to 150 °C, unless otherwise specified.

Table 4.

Thermal data

Symbol

Parameter

SO-20

PowerSO-20

Unit

Rthj-amb

Thermal resistance junction to ambient

50

-

°C/W

Rthj-case

Thermal resistance junction to case

-

< 2

°C/W

Table 5.

OUT1

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VO1

Supply output voltage

VS = 6 to 28 V;

IO1 = 400 µA to 100 mA

4.9

5

5.1

V

TJ ≤ 125°C;

IO1 = 50 to 400 µA

4.8

5

5.2

V

VDP1

Drop output voltage 1

IOUT1 = 10 mA

0.1

0.2

V

IOUT1 = 100 mA; VS = 4.8 V

0.2

0.4

V

VOL01

Load regulation 1

IOUT1 = 1 to 100 mA (after

regulation setting)

25

mV

VLIM1

Current limit 1

VOUT1 = 0.8 to 4.5 V

100

200

400

mA

IQSB

Quiescent current in

standby mode

IEN ≥ 2.4 V (output 2 disabled)

IO1 = 0.1 mA; VSI > 1.3 V

65

90

µA

TJ <85°C; RPR = 0

75

µA

Table 6.

OUT2

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VO2

Output voltage 2 ADJ

connected to OUT2

Enable = low; VS = 6 to 28 V;

IO2 = 5 to 400 mA

4.9

5.1

V

VDP2

Drop output voltage 2

IOUT2 = 100 mA

0.2

0.3

V

IOUT2 = 400 mA; VS = 4.8 V

0.3

0.6

V

VOL02

Load regulation 2

IOUT1 = 5 to 400 mA

(after regulation setting)

50

mV

RADJ

Adjust input resistance

60

100

150

mA

ILIM2

Current limit 2

V02 = 0.8 to 4.5 V

450

650

1300

mA

IQ

Quiescent current

IOUT1 = 100 mA;

IOUT2 = 400 mA

20

mA