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LM2576S-5.0/NOPB

TILM2576S-5.0/NOPB

Texas Instruments
Another popular 3 A fixed 5 V buck regulator with a simple external component set and broad availability; useful if you need a regulator with different switching characteristics or layout options.
NRND5,888 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The LM2576S-5.0/NOPB is a 3A monolithic step-down switching regulator that provides a fixed 5V output. It operates at a 52kHz switching frequency and is designed to minimize the number of external components required for a complete power supply circuit. This regulator supports a wide input voltage range from 4V to 40V and includes internal frequency compensation and a fixed-frequency oscillator.

Why Choose This Part

This regulator offers high current capability of 3A in a surface-mount DDPAK/TO-263 package with only 5 pins. It features a low-power standby mode with a typical 50uA sleep current and includes thermal shutdown and current limit protection for reliability.

Applications

High-Efficiency Step-Down Regulation
Used as a primary regulator for local on-card regulation from unregulated DC sources.
Simple Switching Power Supplies
Ideal for designs requiring a robust 5V rail without the complexity of modern high-frequency controllers.
Battery Powered Systems
Suitable for applications needing 3A of current where linear regulator heat dissipation would be excessive.
Industrial Control Rails
Provides a stable 5V supply for logic and sensors in industrial environments with input swings up to 40V.

Key Specifications

Function Step-Down
Topology Buck
Output Type Fixed
Mounting Type Surface Mount
Package / Case TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Current - Output 3A
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 52kHz
Operating Temperature -40degC ~ 125degC (TJ)
Synchronous Rectifier No
Voltage - Input (Max) 40V
Voltage - Input (Min) 4V
Supplier Device Package TO-263 (DDPAK-5)
Voltage - Output (Min/Fixed) 5V

Getting Started

To implement this part, ensure the use of a low-ESR output capacitor and an inductor rated for at least 3A. Layout is critical even at 52kHz; keep the feedback trace away from the inductor and use a wide ground plane for thermal management of the TO-263 package. The ON/OFF pin can be tied to ground for continuous operation or driven by logic for power sequencing.

Part of LM2596 / LM2576 Switching Regulator family » LM2576S

LM2576S Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Output Type Output V Stock
LM2576S-5.0/NOPB (this part) Fixed 5V 5,888
LM2576S-ADJ/NOPB Adjustable 1.23V 3,583

Also Consider

LM2596S-5.0/NOPB TITexas Instruments - Features a higher switching frequency of 150kHz which allows for significantly smaller inductors and capacitors.
L7805ABD2T-TR STMicroelectronics - A linear regulator alternative for low-noise applications if high heat dissipation is manageable at lower current levels.

Categories

Power Management > Switching Regulators