The LM25149-Q1 is a 42-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 LM25149-Q1 can be set up in dual-phase mode with accurate current sharing for high-current applications. The device can operate with VIN as low as 3.5 V, at nearly 100% duty cycle if needed.
The LM25149-Q1 has two unique EMI reduction features: active EMI filter and dual random spread spectrum (DRSS). The active EMI filter senses any noise or ripple voltage on the DC input bus and injects an out-of-phase cancellation signal to reduce the disturbance. DRSS combines low-frequency triangular and high-frequency randomized modulations to mitigate EMI 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 LM25149-Q1 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 and bootstrap diode, internal 3-ms soft-start time, and thermal shutdown protection with automatic recovery.
The LM25149-Q1 controller comes in a 3.5-mm × 5.5-mm thermally enhanced, 24-pin VQFN package with wettable flank pins to facilitate optical inspection during manufacturing.
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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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