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L4903

DUAL 5V REGULATOR WITH RESET AND DISABLE FUNCTIONS

STMicroelectronics 

L4903

PIN FUNCTIONS

N°

Name

Fu nction

1

Input 1

Low Quiescent Current 50mA Regulator Input

2

Input 2

100mA Regulator Input.

3

Timing

If Reg. 2 is switched-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 Disable Input A high level (> VDT) disables output Reg. 2.

6 Reset Output When pin 3 reaches 5V the reset output is switched low.

Therefore tRD = Ct (105µVA) ; tRD (ms) = Ct (nF).

7

Output 2 5V – 100mA Regulator Output. Enabled if Vo 1 > VRT. DISABLE INPUT < VDT and VIN 2 > VIT.

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

8 Output 1

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

BLOCK DIAGRAM

SCHEMATIC DIAGRAM

2/8

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