The LM5148 is a 80-V, ultra-low IQ synchronous buck DC/DC controller for high-current, single-output applications. The controller uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The LM5148 can be set up in idual-phase mode (paralleled output) with accurate current sharing for high-current applications. It can operate at input voltages as low as 3.5 V, at nearly 100% duty cycle if needed.
The LM5148 has a unique EMI reduction feature known as dual random spread spectrum (DRSS). Combining low-frequency triangular and high-frequency random modulations mitigates EMI disturbances across lower and higher frequency bands, respectively. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.
Additional features of the LM5148 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain power-good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.
The LM5148 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package.
| Tipo | Título | Fecha | ||
|---|---|---|---|---|
| * | Data sheet | LM5148 80-V, Synchronous, Buck DC/DC Controller with Ultra-Low IQ and Dual Random Spread Spectrum datasheet | PDF | HTML | 15 feb 2023 |
| Application note | Controller to Converter – Design Considerations for 24V and 48V Systems | PDF | HTML | 02 oct 2024 | |
| Application note | How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck | PDF | HTML | 16 ago 2023 | |
| Functional safety information | LM5148 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 15 feb 2023 | |
| User guide | LM25149-Q1 EVM User's Guide (Rev. A) | PDF | HTML | 29 abr 2022 |
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
El módulo de evaluación (EVM) de alta densidad LM5149‑Q1EVM‑400 está diseñado para mostrar el rendimiento del controlador reductor de CC/CC síncrono de alto rendimiento para automoción LM5149‑Q1. El EVM funciona en un amplio rango de tensión de entrada de 15 V a 72 V para brindar una salida fija de (...)
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| VQFN (RGY) | 24 | Ultra Librarian |
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LM(2)5148/-Q1 quickstart calculator
Welcome to the quickstart design calculator tool for the LM5148, LM5148-Q1, LM25148 and LM25148-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the LM(2)5148/-Q1 controller family. As such, the user can expeditiously arrive at an optimized design to meet the application requirements.