L4989D datasheet(5/19 Pages) STMICROELECTRONICS

Part #	L4989D

Description	Automotive low power voltage regulator

PDF	19 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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5 / 19 page

DS8714 Rev 3

5/19

L4989D, L4989MD

Block diagram and pin configuration

Figure 1. Block diagram

Table 2. Pins description

Pin name

SO-8(D)

S0-20(MD)

Function

WEn

Watchdog Enable input

If high watchdog functionality is active.

Gnd

Ground reference

Gnd

5, 6, 15, 16

Ground.

Connected these pins to a heat spreader ground

Res

Reset output.

It is pulled down when output voltage goes 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.

L4989D Datasheet(PDF) 5 Page - STMicroelectronics