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LM2596T-ADJ/NOPB

TILM2596T-ADJ/NOPB

Texas Instruments
Buck Switching Regulator IC Positive Adjustable 1.2V 1 Output 3A TO-220-5 Formed Leads
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Overview

The LM2596T-ADJ/NOPB is a step-down (buck) switching regulator capable of driving a 3A load with excellent line and load regulation. It operates at a fixed switching frequency of 150kHz and allows for an adjustable output voltage starting from 1.2V. This regulator is designed to minimize the number of external components to simplify power supply design.

Why Choose This Part

The 150kHz switching frequency allows for smaller filter components compared to lower frequency regulators. It features integrated thermal shutdown and current-limit protection, and includes a TTL shutdown capability with 80uA standby current to conserve power. The TO-220-5 package provides robust thermal management for high-current applications up to 3A.

Applications

High-Efficiency Step-Down Regulation
Converting higher voltage rails down to lower voltages for digital logic while maintaining high efficiency.
On-Card Switching Regulators
Providing localized power regulation on PCBs where through-hole mounting is preferred for thermal or mechanical reasons.
Battery Charger Circuits
Utilizing the 3A output capability for constant voltage charging applications.
Positive-to-Negative Converters
Configuring the buck regulator in an inverting topology for negative voltage rails.

Key Specifications

Function Step-Down
Topology Buck
Output Type Adjustable
Mounting Type Through Hole
Package / Case TO-220-5 Formed Leads
Current - Output 3A
Number of Outputs 1
Output Configuration Positive
Frequency - Switching 150kHz
Operating Temperature -40degC ~ 125degC (TJ)
Synchronous Rectifier No
Voltage - Input (Max) 40V
Voltage - Input (Min) 4.5V
Voltage - Output (Max) 37V
Supplier Device Package TO-220-5
Voltage - Output (Min/Fixed) 1.2V

Getting Started

When designing with the LM2596, ensure the input capacitor is placed as close as possible to the VIN and GND pins to minimize EMI. Use a low-ESR Schottky catch diode to maintain efficiency and prevent voltage spikes. For prototyping, the through-hole TO-220 package is compatible with standard heat sinks and can be evaluated on a perfboard with proper ground plane considerations.

Part of LM2596 / LM2576 Switching Regulator family » LM2596T

LM2596T Family

Part NumberDifferenceStock
LM2596T-ADJ/LF02 LF02 479
LM2596T-12/NOPB 12/NOPB 369

Also Consider

LM2576T-ADJ/NOPB TITexas Instruments - A similar 3A buck regulator that operates at a lower 52kHz switching frequency, requiring larger inductors but often easier to stabilize.
LM2596S-ADJ/NOPB TITexas Instruments - The surface-mount TO-263 version of the same regulator for automated SMT production.
L7805CV STMicroelectronics - A simpler linear regulator alternative if efficiency and heat dissipation are not primary concerns for low-current drops.