L4995 datasheet(6/36 Pages) STMICROELECTRONICS

6 / 36 page

DS5053 Rev 15

7/37

L4995

Block diagrams and pins descriptions

Figure 3. Block diagram of L4995R

Table 2. Pins descriptions

name

PowerSSO-12

pin #

PowerSSO-24

pin #

Function

13, 14, 15

Enable input (L4995 and L4996A only, otherwise not

connected).

If high regulator, watchdog and reset are operating. If

low regulator, watchdog and reset are shutdown.

Connect to Vs if not used.

2, 4, 8

3, 5, 6, 9, 11

Not connected.

GND

16, 17, 18

Ground reference.

-TAB

TAB, 1, 12

Substrate of the chip: connect the pins or the TAB to

GND.

Res

19, 20, 21

Reset output.

It is pulled down when output voltage goes below Vo_th

or frequency at Wi is too low. Leave floating if not used.

Vcr

22, 23, 24

Reset timing adjust.

A capacitor between Vcr pin and GND. Sets the reset

delay time (trd). Leave floating if Reset is not used.

Vcw

Watchdog timer adjust (L4995 only, otherwise not

connected).

A capacitor between Vcw pin and GND. Sets the time

response of the watchdog monitor.

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