Texas Instruments LM25011MY Buck Regulator, Adjustable 6‑42V In, 40V 2A Out, MS

The Texas Instruments LM25011MY/NOPB is a sophisticated constant on‑time, non‑synchronous buck regulator designed for efficient, low‑cost bias power supply applications. Housed in a compact 10‑pin MSOP package, it integrates all necessary functions including an N‑channel buck switch, a startup regulator, current‑limit detection, and internal ripple control, simplifying your circuit design.

Its constant on‑time regulation principle eliminates the need for complex loop compensation, ensuring exceptionally fast load transient response and easier implementation. The device maintains a constant operating frequency of 2MHz regardless of variations in line voltage or load, providing stable and predictable performance. A key advantage is the adjustable valley current limit, which facilitates a smooth transition from constant‑voltage to constant‑current mode when the limit is reached, avoiding disruptive current‑limit foldback.

Engineered for robustness, the regulator offers a wide adjustable output voltage from 2.51V to 40V, capable of delivering up to 2A of continuous output current. It accepts a broad input voltage range of 6V to 42V, making it versatile for various power sources. Additional protective and control features include low output ripple, an input undervoltage lock‑out, thermal shutdown, gate drive pre‑charge, gate drive undervoltage lock‑out, and a maximum duty‑cycle limit. For system monitoring and sequencing, it provides a ‘power good’ output and adjustable soft‑start timing, all supported by a precision 2% feedback reference.

Key Specifications

• Topology: Buck (Step‑Down)
• Input Voltage: 6V to 42V
• Output Voltage: Adjustable from 2.51V to 40V
• Output Current: 2A
• Switching Frequency: 2MHz (constant)
• Current Limit: Adjustable for inductor optimisation
• Key Features: Power‑good output, adjustable soft‑start, precision 2% reference