L4940V5

Overview

The L4940V5 is a fixed 5V positive voltage regulator capable of delivering up to 1.5A of output current. It is designed as a very low dropout alternative to standard 7805 regulators, requiring a significantly smaller voltage differential between input and output to maintain regulation. The device includes robust internal protection circuitry including thermal shutdown and short-circuit current limiting.

Why Choose This Part

The L4940V5 features a low dropout voltage that is significantly lower than standard NPN-pass regulators, making it ideal for systems with narrow input-to-output margins. It is highly resilient due to built-in reverse polarity protection, internal current limiting, and thermal shutdown. The TO-220 package allows for easy heat sinking in high-power applications requiring the full 1.5A output.

Applications

Getting Started

To implement the L4940V5, place a 0.1uF ceramic capacitor on the input pin and a 22uF electrolytic capacitor on the output pin to ensure stability. Ensure the TO-220 tab is properly coupled to a heat sink if the power dissipation (Vin - Vout * Iout) exceeds the package's ambient thermal limits. Verify that the input voltage remains below the 17V maximum rating during normal operation.

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