L4973 STMicroelectronics, L4973 Datasheet - Page 3

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

THERMAL DATA
(*) Package mounted on board.
ABSOLUTE MAXIMUM RATINGS
PIN FUNCTIONS
Powerdip
13,14,15
DIP-18
V
Symbol
V
V
R
4,5,6
R
I
V
V
V
V
V
9
7,8
2,3
7
2
2
V
11
10
18
12
16
th(j-amb)
th(j-pin)
-V
9
1
,V
,V
,I
11
17
12
18
10
9
3
8
8
3
Symbol
T
J
P
,T
tot
STG
14,15,16,17
4,5,6,7
V
S0-20
SO20
V
V
Thermal Resistance Junction to pin
Thermal Resistance to Ambient
V19
I
10
V
V
V
V
V
8,9
2,3
9
2
2
12
11
10
20
13
18
1
,V
,V
,I
10
12
13
20
11
-V
3
8
3
8
Input voltage
Output DC voltage
Output peak voltage at t = 0.1 s f=200KHz
Maximum output current
Bootstrap voltage
Analogs input voltage (V
Analogs input voltage (V
(V
(V
Inhibit
Power dissipation a T
(T
(T
Power dissipation a T
Junction and storage temperature
amb
amb
CC
CC
COMP
NAME
BOOT
SYNC
OUT
GND
OSC
V5.1
VFB
INH
Vcc
= 20V)
= 20V)
= 70 C no copper area)
= 70 C 4cm copper area on PCB)
E/A output to be used for frequency compensation
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 regulator output.
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. An external
resistive divider is required for higher output voltages. For output voltage
less than 3.3V, see note ** and Figure 32.
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)
Parameter
pins
pins
CC
CC
= 90 C
= 24V)
= 24V)
90 C
Parameter
L4973V3 - L4973V5 - L4973D3 - L4973D5
DESCRIPTION
Max.
Max.
Powerdip
60 (*)
DIP
12+3+3
SO20
12
-40 to 150
int. limit.
SO20
80 (*)
Value
-0.3
-0.3
-0.3
Vcc
1.3
15
5.5
58
14
70
12
13
-1
-5
6
5
2
4
Unit
Unit
C/W
C/W
W
W
W
W
V
V
V
V
V
V
V
V
V
V
V
V
V
C
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