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STMicroelectronics Electronic Components Datasheet

L4973V5.1 Datasheet

3.5A STEP DOWN SWITCHING REGULATOR

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L4973V5.1 pdf
L4973V3.3 - L4973V5.1
® L4973D3.3 - L4973D5.1
3.5A STEP DOWN SWITCHING REGULATOR
UPTO 3.5ASTEP DOWNCONVERTER
OPERATING INPUT VOLTAGE FROM 8V TO
55V
3.3V AND 5.1V (±1%) FIXED OUTPUT, AND
ADJUSTABLE OUTPUTS FROM:
0V TO 50V (3.3V type)
5.1V TO 50V (5.1 type)
FREQUENCY ADJUSTABLE UP TO 300KHz
VOLTAGE FEED FORWARD
ZERO LOAD CURRENT OPERATION (min
1mA)
INTERNAL CURRENT LIMITING (PULSE BY
PULSE AND HICCUP MODE)
PRECISE 5.1V (1.5%) REFERENCE VOLT-
AGE EXTERNALLY AVAILABLE
INPUT/OUTPUT SYNCHRONIZATION FUNC-
TION
INHIBIT FOR ZERO CURRENT CONSUMP-
TION (100µA Typ. at VCC = 24V)
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMAL SHUTDOWN
OUTPUT OVERVOLTAGE PROTECTION
SOFT START FUNCTION
TYPICAL APPLICATION CIRCUIT (POWERDIP)
MULTIPOWER BCD TECHNOLOGY
POWERDIP (12+3+3)
SO20(12+4+4)
ORDERING NUMBERS:
L4973V3.3 (Powerdip)
L4973D3.3 (SO20)
L4973V5.1 (Powerdip)
L4973D5.1 (SO20)
DESCRIPTION
The L4973 is a step down monolithic power
switching regulator delivering 3.5A at fixed volt-
ages of 3.3V or 5.1V and using a simple external
divider output adjustable voltage up to 50V.
Realized in BCD mixed technology, the device
VCC (8V to 55V)
CIN
ROSC
C2
78
L4973
1
4,5,6,
13,14,15 16 17
10 12
9
3
11 2
CBOOT
L1
COSC
CSS
RCOMP
CCOMP
D1
VO(3.3V or 5.1V)
COUT
D97IN554A
April 2000
1/16


STMicroelectronics Electronic Components Datasheet

L4973V5.1 Datasheet

3.5A STEP DOWN SWITCHING REGULATOR

No Preview Available !

L4973V5.1 pdf
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
OUT
OUT
GND
GND
GND
VCC
VCC
BOOT
1
2
3
4
5
6
7
8
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
VFB
5.1V
3.3V
12(13)
+
E/A
-
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


Part Number L4973V5.1
Description 3.5A STEP DOWN SWITCHING REGULATOR
Maker STMicroelectronics
Total Page 16 Pages
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L4973V5.1 pdf
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