The LM5146 100-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high-voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5146 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance industrial controls, robotics, datacom, and RF applications.
Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5146 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. A) | PDF | HTML | 23 Jun 2021 |
| Application note | Controller to Converter – Design Considerations for 24V and 48V Systems | PDF | HTML | 02 Oct 2024 | |
| Functional safety information | LM5146 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 23 Jun 2021 | |
| E-book | An Engineer’s Guide to Low EMI in DC/DC Regulators | 21 Apr 2021 | ||
| EVM User's guide | LM5146-Q1EVM User's Guide | 10 Aug 2018 | ||
| White paper | An overview of radiated EMI specifications for power supplies | 05 Jun 2018 | ||
| White paper | An overview of conducted EMI specifications for power supplies | 01 Feb 2018 | ||
| Application brief | Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout | 13 Nov 2017 | ||
| EVM User's guide | LM5145EVM-HD-20A High Density Evaluation Module (Rev. A) | 07 Jun 2017 |
For additional terms or required resources, click any title below to view the detail page where available.
The LM5146-Q1-EVM12V high density evaluation module (EVM) is designed to showcase the performance of the LM5146-Q1 high performance, synchronous buck DC-DC buck controller with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGY) | 20 | Ultra Librarian |
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