L4979D-E datasheet(5/22 Pages) STMICROELECTRONICS

5 / 22 page

DS3717 Rev 12

5/22

L4979D-E, L4979MD

Block diagram and pin descriptions

Figure 1. Block diagram

Table 2. Pin function

SO8

pin number

SO20

pin number

Pin name

Function

Enable input If high, regulator, watchdog and reset are

operating. If low, regulator, watchdog and reset are shut

down.

gnd

Ground reference

5,6,15,16

gnd

Ground. These pins are to be connected to a heat

spreader electrically grounded

Res

Reset output. It is pulled down when output voltage

drops below Vo_th or frequency at Wi is too low.

Vcr

Reset timing adjust a capacitor between Vcr pin and

gnd sets the reset delay time (trd)

Vcw

Watchdog timer adjust a capacitor between Vcw pin and

gnd sets the time response of the watchdog monitor.

Watchdog input. If the frequency at this input pin is too

low, the Reset output is activated.

Voltage regulator output output capacitor >100 nF is

needed for regulator stability

Voltage reference

reset

watchdog

Vcw

Vcr

Ctr

Ctw

Res

gnd

5V, 150 mA

Voltage reference

reset

watchdog

Vcw

Vcr

Ctr

Ctw

Res

gnd

5V, 150 mA

GAPGCFT00200

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