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L4902A

DUAL 5V REGULATOR WITH RESET AND DISABLE

STMicroelectronics 

L4902A

PIN FUNCTIONS

N°

Name

Function

1

Input 1

Regulators Common Input

2

Timing

If Reg. 2 is switched-ON the delay capacitor is charged with a 5µA constant current. When

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

3 Disable Input A high level (> VDT) disable output Reg. 2.

4

GND

Common Ground

5 Reset Output When pin 2 reaches 5V the reset output is switched high.

Therefore

tRD

=

Ct

( 5V )

10µA

;

tRD

(ms)

=

Ct

(nF)

6

Output 2 5V – 300mA Regulator Output. Enabled if Vo 1 > VRT. DISABLE INPUT < VDT and VIN > VIT. If

Reg. 2 is switched-OFF the C02 capacitor is discharged.

7

Output 1 5V – 300mA. Low leakage (in switch-OFF condition) output

BLOCK DIAGRAM

SCHEMATIC DIAGRAM

2/9

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