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L4973D5 Datasheet(PDF) 1 Page - STMicroelectronics

Part # L4973D5
Description  3.5A STEP DOWN SWITCHING REGULATOR
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4973D5 Datasheet(HTML) 1 Page - STMicroelectronics

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L4973V3.3 - L4973V5.1
L4973D3.3 - L4973D5.1
3.5A STEP DOWN SWITCHING REGULATOR
UPTO 3.5ASTEP DOWN CONVERTER
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 (100
µA Typ. at VCC = 24V)
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMAL SHUTDOWN
OUTPUT OVERVOLTAGE PROTECTION
SOFT START FUNCTION
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
April 2000
®
L4973
V
CC (8V to 55V)
C
IN
C2
ROSC
COSC
D1
L1
COUT
VO(3.3V or 5.1V)
CBOOT
4,5,6,
13,14,15
7
9
8
1
11
3
10
D97IN554A
17
RCOMP
CCOMP
CSS
2
16
12
TYPICAL APPLICATION CIRCUIT (POWERDIP)
POWERDIP (12+3+3)
SO20(12+4+4)
ORDERING NUMBERS:
L4973V3.3 (Powerdip)
L4973D3.3
(SO20)
L4973V5.1 (Powerdip)
L4973D5.1
(SO20)
MULTIPOWER BCD TECHNOLOGY
1/16


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