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L4938N

DUAL MULTIFUNCTION VOLTAGE REGULATOR

STMicroelectronics 

L4938N - L4938ND - L4938NPD

ELECTRICAL CHARACTERISTICS (VS = 14V; –40°C ≤ TJ ≤ 125°C unless otherwise specified)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

VS

Operating Supply Voltage

25

V

VO1 Standby Output Voltage

6V ≤ VS ≤ 25V

1mA ≤ IO1 ≤ 50mA

4.90 5.00 5.10

V

VO2 - VO1 Output Voltage 2 Tracking Error

(note 1)

6V ≤ VS ≤ 25V

5mA ≤ IO2 ≤ 500mA

Enable = LOW

–25

+25 mV

IADJ ADJ Input Current

IO1 = 1mA; IO2 = 5mA

–1

0.1

1

µA

VDP1 Dropout Voltage 1

IO1 = 10mA

0.1 0.25

V

) VIO1

ct(s VDP2

rodu VIO2

te P ct(s) VOL1.2

sole rodu VOLO1

VOLO2

b P ILIM1

) - O lete ILIM2

t(s o IQSB

roduc - Obs IQ

te P ct(s) ENABLE

IO1 = 50mA

Input to Output Voltage

Difference in Undervoltage

Condition

VS = 4V, IO1 = 35mA

Dropout Voltage 2

IO1 = 100mA

IO1 = 500mA

Input to Output Voltage

Difference in Undervoltage

Condition

VS = 4.6V, IO1 = 350mA

Line Regulation

6V ≤ VS ≤ 25V

IO1 = 1mA; IO2 = 5mA

Load Regulation 1

1mA ≤ IO1 ≤ 50mA

Load Regulation 2

5mA ≤ IO2 ≤ 500mA

Current Limit 1

VO1 = 4.5V

VO1 = 0V (note 2)

Current Limit 2

VO2 = 0V

Quiescent Current Standby Mode

(output 2 disabled)

IO1 = 0.3mA; TJ < 100°C

VEN ≥ 2.4V

VS = 14V

VS = 3.5V

Quiescent Current

IO1 = 50mA

IO1 = 500mA

le du VENL

so ro VENH

b P VENhyst

OObsolete IEN

Enable Input LOW Voltage

(output 2 active)

Enable Input HIGH Voltage

Enable Hysteresis

Enable Input Current

0V < VEN < 1.2V

2.5V < VEN < 7V

0.2

0.4

V

0.4

V

0.2

0.3

V

0.3

0.6

V

0.6

V

20

mV

25

mV

50

mV

55

100 200 mA

25

50

100 mA

550 1000 1700 mA

210 290

µA

340 850

µA

30

mA

–0.3

1.5

V

2.4

7

V

30

75

200 mV

–10 –1.5 –0.5

µA

–1

0

+1

µA

4/12

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