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L4904A

DUAL 5V REGULATOR WITH RESET

STMicroelectronics 

L4904A

PIN FUNCTIONS

N°

Name

Function

1

Input 1 Low Quiescent Current 50mA Regulator Input.

2

Input 2 100mA Regulator Input.

3

Timing If Reg. 2 is switching-ON the delay capacitor is charged with a 10µA constant current. When

Capacitor Reg. 2 is switched-OFF the delay capacitor is discharged.

4

GND Common Ground.

5

N.C.

Not connected.

6

Reset When pin 3 reaches 5V the reset output is switched high.

Output

Therefore

tRD

=

Ct

( 5V );

10µA

tRD

(ms)

=

Ct

(nF).

7

Output 2 5V – 100mA Regulator Output. Enabled if Vo 1 > VRT and VIN 2 > VIT. If Reg. 2 is switched-OFF

the Co2 capacitor is discharged.

8 Output 1 5V – 50mA regulator output with low leakage in switch-OFF condition.

BLOCK DIAGRAM

SCHEMATIC DIAGRAM

2/9

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