L4973V3.3

Output Power :
Packaging : Tube
Mounting Style : Through Hole
Operating Temperature Range : - 40 C to + 150 C
Input Voltage : 8 V to 55 V
Output Current : 3.5 A
Switching Frequency : 90 KHz to 110 KHz
Output Voltage : 3.36 V
Package / Case : PDIP-18


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


Pinout




Specifications

Symbol		Parameter		Value	Unit
DIP-18	S0-20
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 (VCC = 24V)		12	V
V17	V19	Analogs input voltage (VCC = 24V)		13	V
V12	V13	(VCC = 20V)		6 -0.3	V V
V18	V20	(VCC = 20V)		5.5 -0.3	V V
V10	V11	Inhibit		Vcc -0.3	V V
Ptot		Power dissipation a Tpins 90°C (Tamb = 70°C no copper area) (Tamb = 70°C 4cm copper area on PCB)	DIP 12+3+3	5 1.3 2	W W W
		Power dissipation a Tpins = 90°C	SO20	4	W
Tj,Tstg		Junction and storage temperature		-40to150	°C

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,L4973 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 L4973  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.

Parameters:

Technical/Catalog Information	L4973V3.3
Vendor	STMicroelectronics
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	5W
Package / Case	18-DIP
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	L4973V3 3 L4973V33 497 1413 5 ND 49714135ND 497-1413-5