E-L4973V3.3

$3.30

Description：IC REG BUCK ADJ/0.5V 3.5A 18DIP
Series：-
Mfr：STMicroelectronics
Package：Tube

SKU:6bb9eb1fa51f Category: Voltage Regulators - DC DC Switching Regulators Brand: STMicroelectronics

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Product introduction

Product Detailed Parameters

Description：IC REG BUCK ADJ/0.5V 3.5A 18DIP
Series：-
Mfr：STMicroelectronics
Package：Tube
Function：Step-Down
Output Configuration：Positive
Topology：Buck
Output Type：Adjustable (Fixed)
Number of Outputs：1
Voltage - Input (Min)：8V
Voltage - Input (Max)：55V
Voltage - Output (Min/Fixed)：0.5V (3.3V)
Voltage - Output (Max)：50V
Current - Output：3.5A
Frequency - Switching：100kHz ~ 300kHz
Synchronous Rectifier：No
Operating Temperature：-40°C ~ 150°C (TJ)
Mounting Type：Through Hole
Package / Case：18-DIP (0.300", 7.62mm)
Supplier Device Package：18-DIP
Grade：-
Qualification：-

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E-L4973V3.3

Overview

The L4973E-L4973V3.3 is a step-down monolithic power switching regulator from STMicroelectronics, delivering up to 3.5A output current. It features an operating input voltage range of 8V to 55V and provides a fixed 3.3V output with ±1% accuracy. The device utilizes BCD mixed technology with an internal power D-MOS transistor (typical RDS(on) of 0.15Ω). Switching frequency is adjustable up to 300kHz. Available in SO20 surface-mount and DIP-18 through-hole packages.

Feature Summary

Integrated high-efficiency power D-MOS transistor for fast switching times
Pulse-by-pulse current limiting with hiccup mode for short-circuit protection
Voltage feed-forward regulation and soft-start functionality
Inhibit pin enables zero current consumption

Applications

Industrial control systems requiring wide input voltage ranges
Automotive electronics within specified thermal limits
General-purpose DC-DC conversion for embedded applications

Procurement Notes

Verify the specific suffix against official STMicroelectronics documentation to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints for either SO20 or DIP-18 configurations. Confirm availability status as product lifecycles may change. Cross-reference electrical parameters with system requirements before integration.

Selection Notes

Select this component for applications requiring high input voltages up to 55V and substantial output current. Consider the SO20 package for surface-mount designs or DIP-18 for through-hole assembly. Evaluate thermal dissipation capabilities at higher switching frequencies near 300kHz. Ensure external components support the adjustable frequency range and feedback loop stability.

Part Context

This part belongs to the L4973 family of buck converters designed for robust performance in demanding environments. The series supports both fixed and adjustable output voltages using simple external dividers. STMicroelectronics utilizes BCD technology to integrate control logic with high-voltage power stages efficiently.