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L4973D33-L4973D51 fiches techniques PDF

STMicroelectronics - 3.5A STEP DOWN SWITCHING REGULATOR

Numéro de référence L4973D33-L4973D51
Description 3.5A STEP DOWN SWITCHING REGULATOR
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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L4973D33-L4973D51 fiche technique
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

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