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L4973D5

Description
3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO20
CategoryPower/power management    The power supply circuit   
File Size214KB,16 Pages
ManufacturerSTMicroelectronics
Websitehttp://www.st.com/
Download Datasheet Parametric Compare View All

L4973D5 Overview

3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO20

L4973D5 Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
MakerSTMicroelectronics
Parts packaging codeSOIC
package instructionSO-20
Contacts20
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage55 V
Minimum input voltage8 V
Nominal input voltage24 V
JESD-30 codeR-PDSO-G20
JESD-609 codee0
length12.8 mm
Number of functions1
Number of terminals20
Maximum output current3.5 A
Nominal output voltage5.1 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP20,.4
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height2.65 mm
Maximum supply current (Isup)8 mA
surface mountYES
Switch configurationBUCK
Maximum switching frequency300 kHz
technologyBCDMOS
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width7.5 mm
Base Number Matches1
®
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 V
CC
= 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
V
CC
(8V to 55V)
R
OSC
C
IN
C2
7
8
10 12
C
BOOT
V
O
(3.3V or 5.1V)
L1
1
4,5,6,
13,14,15 16
L4973
17
9
3
11 2
R
COMP
C
OSC
C
SS
C
COMP
D1
C
OUT
D97IN554A
April 2000
1/16

L4973D5 Related Products

L4973D5 L4973D3 L4973V3 L4973V5
Description 3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO20 3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO20 3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDIP18 3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO20
Is it lead-free? Contains lead Contains lead Contains lead Contains lead
Is it Rohs certified? incompatible incompatible incompatible incompatible
Maker STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Parts packaging code SOIC SOIC DIP DIP
package instruction SO-20 SO-20 POWER, PLASTIC, DIP-18 POWER, PLASTIC, DIP-18
Contacts 20 20 18 18
Reach Compliance Code not_compliant not_compliant not_compliant not_compliant
ECCN code EAR99 EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 55 V 55 V 55 V 55 V
Minimum input voltage 8 V 8 V 8 V 8 V
Nominal input voltage 24 V 24 V 24 V 24 V
JESD-30 code R-PDSO-G20 R-PDSO-G20 R-PDIP-T18 R-PDIP-T18
JESD-609 code e0 e0 e0 e0
Number of functions 1 1 1 1
Number of terminals 20 20 18 18
Maximum output current 3.5 A 3.5 A 3.5 A 3.5 A
Nominal output voltage 5.1 V 3.3 V 3.3 V 5.1 V
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP DIP DIP
Encapsulate equivalent code SOP20,.4 SOP20,.4 DIP18,.3 DIP18,.3
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE IN-LINE IN-LINE
Peak Reflow Temperature (Celsius) NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
Certification status Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 2.65 mm 2.65 mm 5.1 mm 5.1 mm
Maximum supply current (Isup) 8 mA 8 mA 8 mA 8 mA
surface mount YES YES NO NO
Switch configuration BUCK BUCK BUCK BUCK
Maximum switching frequency 300 kHz 300 kHz 300 kHz 300 kHz
technology BCDMOS BCDMOS BCDMOS BCDMOS
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form GULL WING GULL WING THROUGH-HOLE THROUGH-HOLE
Terminal pitch 1.27 mm 1.27 mm 2.54 mm 2.54 mm
Terminal location DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
width 7.5 mm 7.5 mm 7.62 mm 7.62 mm
Base Number Matches 1 1 1 1
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