L4973V3 데이터 시트보기 (PDF) - STMicroelectronics
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L4973V3 Datasheet PDF : 16 Pages
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L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1
uses an internal power D-MOS transistor (with a
typical Rdson of 0.15ohm) to obtain very high effi-
ciency and very fast switching times.
Switching frequency up to 300KHz are achievable
(the maximum power dissipation of the packages
must be observed).
A wide input voltage range between 8V to 55V
and output voltages regulated from 3.3V to 40V
cover the majority of the today applications.
Features of this new generation of DC-DC con-
verter includes pulse by pulse current limit, hiccup
mode for output short circuit protection, voltage
feed forward regulation, soft start, input/output
synchronization, protection against feedback loop
disconnection, inhibit for zero current consump-
tion and thermal shutdown.
Packages available are in plastic dual in line, DIP-
18 (12+3+3) for standard assembly, and SO20
(12+4+4) for SMD assembly.
PIN CONNECTIONS (Top view)
OSC
1
OUT
2
OUT
3
GND
4
GND
5
GND
6
VCC
7
VCC
8
BOOT
9
18
SYNC
17
SS
16
V5.1
15
GND
14
GND
13
GND
12
VFB
11
COMP
10
INH
D94IN162A
POWERDIP (12+3+3)
OSC
OUT
OUT
GND
GND
GND
GND
VCC
VCC
BOOT
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
D94IN163A
SO20 (12+4+4)
SYNC
SS
V5.1
GND
GND
GND
GND
VFB
COMP
INH
BLOCK DIAGRAM
INH
10(11)
ZERO CURRENT
INHIBIT
VREF
GOOD
17(19)
SS
11(12)
COMP
5.1V
3.3V +
E/A
VFB
-
12(13)
SOFT
START
THERMAL
SHUTDOWN
-
PWM
+
SYNC
18(20)
OSCILLATOR
2/16
Pin x = Powerdip
Pin (x) = S020
1(1)
OSC
5.1V
3.3V
V5.1
16(18)
INTERNAL
REFERENCE
VCC
7(8)
VCC
8(9)
CBOOT
CHARGE
INTERNAL
SUPPLY
5.1V
HICCUP CURRENT
LIMITING
CURRENT
LIMITING
RQ
SQ
BOOT
9(10)
4,5,6,13,14,15
(4,5,6,7,14,15,16,17)
GND
DRIVER
2(2)
OUT
3(3)
OUT
D94IN161B
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