Texas Instruments LM65680/60/40 Synchronous Buck DC-DC Converters

Phase-stackable with synchronized interleaving, the LM65680/60/40's peak-current-mode control architecture supports accurate current sharing across paralleled phases for higher output currents. AUTO mode enables frequency foldback during light-load operation, achieving high light-load efficiency and a no-load input current as low as 2.2µA, thereby extending operating runtime in battery-powered systems. A high-side switch minimum on-time of 36ns facilitates large step-down ratios, enabling direct conversion from 24V or 48V inputs to low-voltage rails, reducing system cost and complexity. The package has several NC pins between critical power pins, which improve the Failure Modes and Effects Analysis (FMEA) result.

The Texas Instruments LM65680/60/40 comes in a 4.5mm × 4.5mm, thermally enhanced, 26-pin eQFN package with additional pin clearance for increased reliability. Also included are wettable-flank pins to facilitate optical inspection during manufacturing. Leveraging a flip-chip routable leadframe (FCRLF) packaging technique, the LM65680/60/40 with usable current, lifetime reliability, and cost advantages targets applications requiring high power density. The wide input-voltage range, low quiescent current, high-temperature operation, cycle-by-cycle current limit, low EMI signature, and small design footprint make this an ideal point-of-load regulator for applications requiring enhanced robustness and durability.