LM2596DSADJR4G 3A Step-Down Switching Regulator 4.5V-40V Input 1.23V-37V Adjustable TO-263-5

LM2596DSADJR4G Product Overview

The LM2596DSADJR4G is a monolithic step-down switching regulator from onsemi, part of the widely adopted LM2596 series. It integrates internal frequency compensation and a 150kHz fixed-frequency oscillator, operating from a 4.5V to 40V input range with an adjustable output voltage from 1.23V to 37V, capable of driving 3A load current with excellent line and load regulation. Available in a TO-263-5 (D2PAK) surface-mount package, the LM2596DSADJR4G offers significantly higher efficiency than traditional linear regulators and requires a minimum number of external components, making it widely used in industrial control, automotive electronics, communication equipment, battery-powered systems, and embedded platform power supplies.

LM2596DSADJR4G Applications

Industrial Control: PLC controllers, motor drive auxiliary power, industrial sensor supplies, 24V to 5V or 12V to 3.3V auxiliary power

Automotive Electronics: In-vehicle power conversion, infotainment system power, body control modules

Communication Equipment: Routers, base stations, optical module power, DC step-down conversion

Battery-Powered Systems: Lithium battery devices, portable electronics, power banks

Embedded Platforms: MCU and Arduino board power, embedded system power management

LCD-TV Power: LCD TV SMPS auxiliary power

Positive-to-Negative Conversion: Buck-Boost converters, negative step-up converters

FAQs

Q: What is the maximum output current?
A: The device delivers 3.0A continuous load current. With integrated power switch and two-stage frequency-reducing current limit protection, it stably outputs 3A under good thermal conditions.

Q: What input voltages are supported?
A: Input voltage ranges from 4.5V to 40V, compatible with +12V, +24V, +36V standard supply buses for industrial control, automotive electronics, and consumer electronics applications.

Q: How is the output voltage set?
A: The LM2596DSADJR4G is the adjustable output version with 1.23V to 37V range, set via external feedback resistor divider. Internal 1.23V reference and loop compensation are integrated, requiring no external compensation components.

Q: What protection features are integrated?
A: Cycle-by-cycle current limiting, thermal shutdown, and two-stage frequency-reducing output switch current limiting. Under overcurrent or overtemperature faults, the protection circuit automatically reduces switching frequency and limits current for device and system safety.

Q: What is the difference between LM2596DSADJR4G and LM2596SX-ADJ/NOPB?
A: The primary difference is package: LM2596DSADJR4G uses TO-263-5 (D2PAK-5), while LM2596SX-ADJ/NOPB uses DDPAK/TO-263-5. Core parameters are essentially identical (4.5V-40V input, 3A output, 150kHz). Select based on package compatibility and supply availability.

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