L4973 STMicroelectronics, L4973 Datasheet - Page 4

• Manufacturer Part Number: L4973
• Description: 3.5A STEP DOWN SWITCHING REGULATOR
• Manufacturer: STMicroelectronics

Pin settings
2.2
Note:
4/27
1
Pin description
Table 1. Pin description
The maximum power dissipation of the package must be observed.
13,14,15
DIP-18
4,5,6
7,8
2,3
11
10
18
12
16
9
1
N° Pin
14,15,16,17
4,5,6,7
SO-20
8,9
2,3
12
11
10
20
13
18
1
COMP
Name
BOOT
SYNC
GND
OSC
OUT
V5.1
VFB
V
INH
CC
E/A output to be used for frequency compensation
Stepdown regulator output.
A logic signal (active high) disables the device (sleep
mode operation). If not used it must be connected to
GND; if floating the device is disabled.
A capacitor connected between this pin and the output
allows to drive the internal D-MOS.
Input/Output synchronization.
Unregulated DC input voltage
Stepdown feedback input. Connecting the output
directly to this pin results in an output voltage of 3.3V for
the L4973V3.3 and 5.1V for L4973V5.1. An external
resistive divider is required for higher output voltages.
For output voltage resistive divider is required for higher
output voltages. For output voltage less than 3.3V, see
Note: 1
Reference voltage externally available.
Signal ground
An external resistor connected between the unregulated
input voltage and Pin 1 and a capacitor connected from
Pin 1 to ground fixes the switching frequency. (Line feed
forward is automatically obtained)
and
Figure 33.
Description
L4973