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L4973D3.3-013TR, L4973D33, L4973D5.1

Table of contents:
Info of L4973D3.3-013TR
Info of L4973D33
Info of L4973D5.1

L4973D3.3-013TR, L4973D33, L4973D5.1 Selling Leads, Datasheet

MFG:STMicroelectronics Category:Integrated Circuits (ICs) Package Cooled:ORG PACKING D/C:0

L4973D3.3-013TR, L4973D33, L4973D5.1 Datasheet download

Five Points

Part Number: L4973D3.3-013TR

Category: Integrated Circuits (ICs)

MFG: STMicroelectronics

Package Cooled: ORG PACKING

D/C: 0

Description: IC REG SW 3.5A STEPDOWN 20-SOIC

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L4973D3.3-013TR Parameters

Technical/Catalog Information	L4973D3.3-013TR
Vendor	STMicroelectronics (VA)
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	8 ~ 55 V
Voltage - Output	3.3V, 0.5 ~ 50 V
Current - Output	3.5A
Power - Output	4W
Package / Case	20-SOIC (7.5mm Width)
Packaging	Cut Tape (CT)
Internal Switch(s)	Yes
Synchronous	Yes
Rds (On)	150 mOhm
Operating Temperature	-40°C ~ 150°C
Frequency - Switching	100kHz ~ 300kHz
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	L4973D3 3 013TR L4973D33013TR 497 3358 1 ND 49733581ND 497-3358-1

L4973D5.1 Parameters

Technical/Catalog Information	L4973D5.1
Vendor	STMicroelectronics
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	8 ~ 55 V
Voltage - Output	5.1V, 5.1 ~ 50 V
Current - Output	3.5A
Power - Output	4W
Package / Case	20-SOIC (7.5mm Width)
Packaging	Tube
Internal Switch(s)	Yes
Synchronous	Yes
Rds (On)	150 mOhm
Operating Temperature	-40°C ~ 150°C
Frequency - Switching	100kHz ~ 300kHz
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	L4973D5 1 L4973D51 497 1412 5 ND 49714125ND 497-1412-5

L4973D5.1 General Description

The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages 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 uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high efficiency 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 converter 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 consumption 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.

L4973D5.1 Maximum Ratings

Symbol		Parameter		Value	Unit
DIP-18	S0-20	Parameter		Value	Unit
V₇,V₈	V₉,V₈	Input voltage		58	V
V₂,V₃	V₂,V₃	Output DC voltage Output peak voltage at t = 0.1s f=200KHz		-1 -5	V V
I₂,I₃	I₂,I₃	Maximum output current		int. limit.
V₉-V₈	V₁₀-V₈			14	V
V₉	V₁₀	Bootstrap voltage		70	V
V₁₁	V₁₂	Analogs input voltage (V_CC= 24V)		12	V
V₁₇	V₁₉	Analogs input voltage (V_CC = 24V)		13	V
V₁₂	V₁₃	(V_CC = 20V)		6 -0.3	V V
V₁₈	V₂₀	(V_CC = 20V)		5.5 -0.3	V V
V₁₀	V₁₁	Inhibit		Vcc -0.3	V V
P_tot		Power dissipation a T_pins 90°C (T_amb= 70°C no copper area) (T_amb= 70°C 4cm copper area on PCB)	DIP 12+3+3	5 1.3 2	W W W
P_tot		Power dissipation a T_pins = 90°C	SO20	4	W
T_j,T_stg		Junction and storage temperature		-40to150	°C

L4973D5.1 Features

·UPTO3.5ASTEPDOWNCONVERTER
·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)
·FREQUENCYADJUSTABLE UP TO300KHz
·VOLTAGEFEED FORWARD
·ZERO LOAD CURRENT OPERATION (min 1mA)
·INTERNAL CURRENT LIMITING (PULSE BY PULSE AND HICCUPMODE)
·PRECISE 5.1V (1.5%) REFERENCE VOLTAGE EXTERNALLY AVAILABLE
·INPUT/OUTPUT SYNCHRONIZATION FUNCTION
·INHIBIT FOR ZERO CURRENT CONSUMPTION (100mA Typ. at V_CC = 24V)
·PROTECTION AGAINST FEEDBACK DISCONNECTION
·THERMAL SHUTDOWN
·OUTPUT OVERVOLTAGEPROTECTION
·SOFT START FUNCTION

L4973D5.1 Connection Diagram

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