L4973 STMicroelectronics, L4973 Datasheet - Page 3

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

L4973
1
2
2.1
Block diagram
Figure 2.
Pin settings
Pin connection
Figure 3.
COMP
SYNC
VFB
SS
BOOT
GND
GND
GND
OSC
OUT
OUT
V
V
Pin x = Powerdip
Pin (x) = S020
CC
CC
5.1V
3.3V
17(19)
11(12)
12(13)
18(20)
ZERO CURRENT
10(11)
Block diagram
Pin connection (top view)
INHIBIT
DIP -18 (12+3+3)
+
-
INH
1
2
3
4
5
6
7
8
9
E/A
OSCILLATOR
D94IN162A
OSC
START
SOFT
1(1)
SHUTDOWN
GOOD
THERMAL
VREF
+
-
PWM
18
17
16
15
14
13
12
11
10
SYNC
SS
V5.1
GND
GND
GND
VFB
COMP
INH
(4,5,6,7,14,15,16,17)
5.1V
3.3V
4,5,6,13,14,15
HICCUP CURRENT
GND
CURRENT
LIMITING
LIMITING
REFERENCE
BOOT
INTERNAL
16(18)
OSC
GND
GND
GND
GND
OUT
OUT
V
V
CC
CC
R
S
V5.1
Q
Q
INTERNAL
1
2
3
4
5
6
7
8
9
10
SUPPLY
SO20 (12+4+4)
7(8)
D94IN163A
V
CC
OUT
DRIVER
5.1V
2(2)
8(9)
20
19
18
17
16
15
14
13
12
11
OUT
V
CC
Block diagram
3(3)
CHARGE
CBOOT
9(10)
D94IN161B
SYNC
SS
V5.1
GND
GND
GND
GND
VFB
COMP
INH
BOOT
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