Pin settings

L4976

4/17

2

Pin settings

2.1

Pin connection

Figure 3.

Pin connection (top view)

2.2

Pin description

N.C.

GND

OSC

OUT

N.C.

OUT

N.C.

N.C.

N.C.

BOOT

VCC

COMP

FB

N.C.

N.C.

1

3

2

4

5

6

7

8

14

13

12

11

10

9

15

16

DIP8

GND

OSC

OUT

1

3

2

4

VCC

BOOT

COMP

FB

8

7

6

5

SO16

Table 1. Pin description

N° Pin

Name

Description

DIP8

1.

Pins 1, 7, 8, 9, 10, 15 and 16 are not internally, electrically connected to the die.

1

2

GND

Ground

2

3

VREF

5.1V Reference voltage with 20mA current capability.

3

4

OSC

An external resistor connected between the unregulated

input voltage and this pin and a capacitor connected

from this pin to ground fix the switching frequency. (Line

feed forward is automatically obtained)

4

5, 6

OUT

Stepdown regulator output.

5

11

VCC

Unregulated DC input voltage.

6

12

BOOT

A capacitor connected between this pin and OUT allows

to drive the internal VDMOS.

7

13

COMP

E/A output to be used for frequency compensation.

8

14

FB

Stepdown feedback input. Connecting directly to this pin

results in an output voltage of 3.3V. An external resistive

divider is required for higher output voltages.