L4925

Application information

Doc ID 1770 Rev 8

11/14

4

Application information

4.1

Supply voltage transients

High supply voltage transients can cause a reset output signal disturbance.

For supply voltage greater than 8 V the circuit shows a high immunity of the reset output

against supply transients of more than 100 V/ms. For supply voltage lower than 8 V, supply

transients of more than 0.4 V/ms. can cause a reset signal disturbance.

4.2

Application circuit

Figure 8.

Application circuit diagram

For stability: CS  1µF; CO  10 µF; ESR  2.5  at 10 KHz

Recommended for application: CS = CO = 10 µF to 100 µF

+

-

PREREGULATOR

5V

VREF

1.23V

Vz

Vz

2

μ

=

VS

GND

2V

RESET

REG

L4925

Vo

CT

RES

D95AT153

VBAT

CS

Co

Vout

RES