L4973V3.3

Obsolete

STMicroelectronics

CONV DC-DC 8V TO 55V STEP DOWN SINGLE-OUT 0.5V TO 50V 3.5A 18-PIN PDIP TUBE

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L4973V3.3

Obsolete

STMicroelectronics

CONV DC-DC 8V TO 55V STEP DOWN SINGLE-OUT 0.5V TO 50V 3.5A 18-PIN PDIP TUBE

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Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	L4973V3.3

Current - Output	3.5 A
Frequency - Switching [Max]	300 kHz
Frequency - Switching [Min]	100 kHz
Function	Step-Down
Mounting Type	Through Hole
Number of Outputs	1
Operating Temperature [Max]	150 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Type	Adjustable (Fixed)
Package / Case	18-DIP
Package / Case [x]	0.3 in
Package / Case [x]	7.62 mm
Supplier Device Package	18-DIP
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Min) [Min]	8 V
Voltage - Output (Max) [Max]	50 V
Voltage - Output (Min/Fixed)	0.5 V
Voltage - Output (Min/Fixed)	3.3 V

L4973 Series

3.5 A step down switching regulator

Part	Voltage - Output (Min/Fixed)	Voltage - Output (Max) [Max]	Number of Outputs	Output Type	Frequency - Switching [Max]	Frequency - Switching [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Current - Output	Voltage - Input (Min) [Min]	Output Configuration	Supplier Device Package	Function	Package / Case	Package / Case [y]	Package / Case [y]	Topology	Voltage - Output (Min/Fixed)	Package / Case [x]	Package / Case [x]
STMicroelectronics L4973D5.1-013TR	5.1 V	50 V	1	Adjustable (Fixed)	300 kHz	100 kHz	150 °C	-40 °C	Surface Mount	3.5 A	8 V	Positive	20-SO	Step-Down	20-SOIC	0.295 in	7.5 mm	Buck
STMicroelectronics L4973V3.3	0.5 V	50 V	1	Adjustable (Fixed)	300 kHz	100 kHz	150 °C	-40 °C	Through Hole	3.5 A	8 V	Positive	18-DIP	Step-Down	18-DIP			Buck	3.3 V	0.3 in	7.62 mm
STMicroelectronics L4973D5.1	5.1 V	50 V	1	Adjustable (Fixed)	300 kHz	100 kHz	150 °C	-40 °C	Surface Mount	3.5 A	8 V	Positive	20-SO	Step-Down	20-SOIC	0.295 in	7.5 mm	Buck

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Description

General part information

L4973 Series

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 RDS(on)of 0.15Ω) 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.

Documents

Technical documentation and resources