CD00257532 datasheet(6/19 Pages) STMICROELECTRONICS

No de pièce	CD00257532

Description	Multifunction very low drop voltage regulator

PDF	19 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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6 / 19 page

Block diagram and pin description

L4949ED-E, L4949EP-E

6/19

Doc ID 16823 Rev 1

Table 2.

Pin definitions and functions

Pin N°

Symbol

Function

SO-8

SO-20

119

Input supply voltage. Block to GND via an external

capacitor (see Figure 3).

220

Sense input pin to supervise input voltage. Connect via an

external voltage divider connected to VS and to GND.

Preregulator output voltage. For details, see Section 3.4:

Preregulator.

Reset pulse delay adjustment. Connecting this pin via a

capacitor to GND

4, 5, 6, 7, 14,

15, 16, 17

GND

Ground reference

610

RES

Reset output. It is pulled down when the output voltage

goes below VRT.

711

Sense output. This open collector pin must be connected to

VOUT via an external resistor. It is pulled down whenever

the SI voltage becomes lower than an internal voltage.

812

VOUT

Output voltage. Block to GND via an external capacitor (see

Figure 3)

3, 8, 9, 13, 18

Not connected pins

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