This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

L4938N/ND

L4938NPD

April 1999

DUAL MULTIFUNCTION VOLTAGE REGULATOR

®

.

STANDBY OUTPUT VOLTAGE PRECISION 5V

± 2%

.

OUTPUT 2 TRACKED TO THE STANDBY OUT-

PUT

.

OUTPUT

2

DISABLE

FUNCTION

FOR

STANDBY MODE

.

VERY LOW QUIESCENT CURRENT, LESS

THAN 250

µA, IN STANDBY MODE

.

OUTPUT 2 VOLTAGE SETTABLE FROM 5 TO

20V

.

.

VERY LOW DROPOUT (max 0.4V/0.6V)

.

OPERATING TRANSIENT SUPPLY VOLTAGE

UP TO 40V

.

POWER-ON RESET CIRCUIT SENSING THE

STANDBY OUTPUT VOLTAGE

.

POWER-ON RESET DELAY PULSE DEFINED

BY THE EXTERNAL CAPACITOR

.

EARLY WARNING OUTPUT FOR SUPPLY UN-

DERVOLTAGE

.

THERMAL SHUTDOWN AND SHORT CIRCUIT

PROTECTIONS

PowerDIP

(12+2+2)

ORDERING NUMBERS: L4938N (PDIP)

L4938ND (SO)

L4938NPD (PSO20)

DESCRIPTION

The L4938N is a monolithic integrated dual voltage

regulators with two very low dropout outputs and ad-

ditional functions such as power-on reset and input

voltage sense. They are designed for supplying mi-

crocomputer controlled systems specially in auto-

motive applications.

PIN CONNECTION (top view)

SO20

(12+4+4)

N.C.

CT

EN

GND

GND

SO

RES

1

3

2

4

5

6

GND

GND

SI

16

15

14

13

12

10

11

D95AT156

8

ADJ

9

POWERDIP

N.C.

C7

EN

GND

GND

GND

GND

RES

SO

GND

GND

GND

GND

ADJ

1

3

2

4

5

6

7

8

9

18

17

16

15

14

12

13

11

19

10

20

SI

D93AT004

SO20

PowerSO20

GND

N.C.

N.C.

N.C.

SI

CT

EN

N.C.

GND

10

8

9

7

6

5

4

3

2

13

14

15

16

17

19

18

20

12

1

11

GND

D95AT169A

N.C.

RESET

SO

ADJ

N.C.

GND

PowerSO20

1/12

Obsolete

Product(s)

- Obsolete

Product(s)