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Texas Instruments LM5149/LM5149-Q1 Synchronous Buck DC-DC Controller is an 80V, 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 LM5149/LM5149-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 3.5V, at nearly 100%, if needed.
The LM5149/LM5149-Q1 has two unique EMI reduction features: an 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. This hybrid technique aligns with the multiple resolution bandwidth (RBW) settings specified in industry-standard EMC tests.
Additional features of the LM5149/LM5149-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, and open-drain power-good flag for fault reporting and output monitor. It includes a precision enable input, monotonic start-up into a pre-biased load, integrated VCC bias supply regulator and bootstrap diode, internal 3ms soft-start time, and thermal shutdown protection with automatic recovery.
The Texas Instruments LM5149/LM5149-Q1 controller comes in a 3.5mm × 5.5mm thermally enhanced, 24-pin VQFN package with wettable flank pins to facilitate optical inspection during manufacturing. The LM5149-Q1 devices are AEC-Q100 qualified for automotive applications.
