Datasheet

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
V
REF
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
V
REF
OSC
OUT
1
3
2
4 VCC
BOOT
COMP
FB8
7
6
5
SO16
Table 1. Pin description
N° Pin
Name Description
DIP8
SO16W
(1)
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.