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E-L4973D3.3 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. E-L4973D3.3
Description  3.5A step down switching regulator
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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 4 page
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Pin settings
L4973
4/27
2.2
Pin description
Note:
1
The maximum power dissipation of the package must be observed.
Table 1. Pin description
N° Pin
Name
Description
DIP-18
SO-20
11
12
COMP
E/A output to be used for frequency compensation
10
11
INH
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.
9
10
BOOT
A capacitor connected between this pin and the output
allows to drive the internal D-MOS.
18
20
SYNC
Input/Output synchronization.
7,8
8,9
VCC
Unregulated DC input voltage
2,3
2,3
OUT
Stepdown regulator output.
12
13
VFB
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 and Figure 33.
16
18
V5.1
Reference voltage externally available.
4,5,6
13,14,15
4,5,6,7
14,15,16,17
GND
Signal ground
1
1
OSC
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)




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