L4979D Просмотр технического описания (PDF) - STMicroelectronics

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производитель

L4979D

Low drop voltage regulator

STMicroelectronics 

L4979D, L4979MD

Block diagram and pin descriptions

1

Block diagram and pin descriptions

Figure 1. Block diagram

6I

6S

6M!

6O

#O

6CW

#TW

7I

WATCHDOG

6OLTAGEREFERENCE

6CR

#TR

RESET

GND

%N

2ES

'!0'#&4

Table 2. Pin function

SO8

SO20

pin number pin number

Pin name

Function

Enable input If high, regulator, watchdog and reset are

1

1

En

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

down.

2

4

gnd

Ground reference

5,6,15,16

gnd

Ground These pins are to be connected to a heat

spreader electrically grounded

3

7

Res

Reset output. It is pulled down when output voltage

drops below Vo_th or frequency at Wi is too low.

4

10

Vcr

Reset timing adjust A capacitor between Vcr pin and

gnd sets the reset delay time (trd)

5

11

Vcw

Watchdog timer adjust A capacitor between Vcw pin and

gnd sets the time response of the watchdog monitor.

6

14

Wi

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

low, the Reset output is activated.

7

17

Vo

Voltage regulator output Output capacitor >100 nF is

needed for regulator stability

Doc ID 10262 Rev 9

5/22

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