The LMQ664x0 is the industry smallest 36V, 3A (available in 2A and 1A variants) synchronous step-down DC/DC converter with an integrated bypass and bootstrap capacitor in an enhanced HotRod QFN package. This easy-to-use converter supports a wide input voltage range of 2.7V to 36V (after start-up or after operating) with transients up to 42V.
The LMQ664x0 is specifically designed to meet low standby power requirements for always-on, industrial applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded typical current consumption of 1.5µA at 13.5VIN and high light load efficiency. A seamless transition between PWM and PFM modes along with very low MOSFET ON resistances makes sure there is exceptional efficiency across the entire load range. The control architecture (peak current mode) and feature set are optimized for an ultra-small design size with minimal output capacitance. The device minimizes input filter size by using dual-random spread spectrum (DRSS), a low-EMI enhanced HotRod QFN package, and an optimized pinout. The RT pin can be used to set the frequency to avoid noise sensitive frequency bands. There are NC pins between critical high voltage pins, reducing potential failures (excellent choice pin FMEA). ZEN 2 switcher features enable the device to support ultra low-EMI applications. The rich feature set of the LMQ664x0 is designed to simplify implementation for a wide range of industrial end equipment.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LMQ664x0 36V, 1A, 2A, and 3A, Ultra-Small, Synchronous ZEN 2 Step-Down Converter With Integrated VIN Bypass and CBOOT Capacitors datasheet (Rev. C) | PDF | HTML | 09 Dec 2025 |
| Functional safety information | LMQ664x0 and LMQ664x0-Q1 Functional Safety FIT Rate, FMD and Pin FMA (Rev. A) | PDF | HTML | 05 Nov 2024 | |
| Application brief | Step-Down Converter Capacitor Integration Reducing Effort for CISPR 25 Class 5 Compliance | PDF | HTML | 18 Jan 2023 | |
| Technical article | How buck regulators with integrated capacitors help lower EMI and save board space | PDF | HTML | 16 Mar 2022 | |
| User guide | LMQ66430-Q1 Buck Controller Evaluation Module User's Guide | PDF | HTML | 02 Feb 2022 | |
| Certificate | LMQ66430EVM-2M EU RoHS Declaration of Conformity (DoC) | 21 Oct 2021 |
For additional terms or required resources, click any title below to view the detail page where available.
The LMQ66430-2EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMQ66430-Q1 device, a synchronous step-down DC/DC converter capable of driving up to 3 A of load current from an input voltage of up to 36 V. The LMQ66430-Q1 has ultra-low operating quiescent (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN-FCRLF (RXB) | 14 | Ultra Librarian |
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