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LM2596: 3A Step-Down Buck Converter — Datasheet & Sourcing
LM2596 guide: 3A 150kHz buck regulator, fixed and adjustable versions, applications and buying tips.
LM2596 guide: 3A 150kHz buck regulator, fixed and adjustable versions, applications and buying tips.
The LM2596 is a popular 3A step-down switching regulator. This guide covers its specs, circuit design and procurement.
By Vigny (深圳市华芯购电子有限公司) · Published 2026-09-27 · Data verified 2026-09-29 · Sources: manufacturer datasheets & HuaXinGou stock verification
The LM2596 is a 150kHz, 3A step-down (buck) regulator accepting 4.5V-40V input, with fixed (3.3V/5V/12V) and adjustable output versions. Package options include TO-220, TO-263 (D2PAK) and SOP-8.
Typical design requires an inductor, Schottky diode (e.g., SS34), input/output capacitors and feedback resistors for adjustable output. Efficiency reaches 80-90% in common 5V/12V applications.
Used in module boards, battery chargers, industrial power rails and DIY power supplies. It is also the basis of countless ready-made buck modules.
LM2596 comes from TI (original) and many domestic equivalents (e.g., XL4005 family for higher current). Specify brand when it matters. HuaXinGou confirms availability.
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