Wide VIN DC/DC controller claims industry’s highest 65-V operation

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By Field Editor

The LM5140-Q1 controller includes dual outputs with phase interleaving and is offered in wettable flank packaging that speeds manufacturing. Together with TI’s WEBENCH Automotive Design tool, the LM5140-Q1 enables engineers to get their automotive designs to market faster.

The controller has a wide 3.8-V to 65-V operating range to handle start-stop and load-dump conditions for 12-V/24-V lead-acid and emerging 48-V Lithium-ion automotive batteries.

The device’s 2.2-MHz operation with external synchronization capability moves switching noise above the sensitive AM band and eliminates the need for frequency hopping.

The LM5140-Q1’s adjustable gate-drive slew-rate control reduces EMI emissions by up to 10 dB with less than a 1 percent reduction in efficiency, which reduces external EMI filtering, saves printed circuit board (PCB) area, and simplifies compliance with CISPR 25 automotive EMI requirements.

The controller’s low 35-uA quiescent current (IQ) in standby (one channel operating with no load) extends battery life in ‘always on’ applications.

The device’s wettable flank packaging enables post-solder visual inspection to speed manufacturing.

The LM5140-Q1 joins the recently released LM53600-Q1, LM53601-Q1, LM53602-Q1 and LM53603-Q1 buck converters to create a complete family of controllers and converters designed for automotive systems that draw from less than 1 A of power to more than 10 A. All of these devices feature greater than 2-MHz switching frequency, low operating IQ and EMI reduction features.

The LM5140-Q1 uses external metal-oxide semiconductor field-effect transistors (MOSFETs) to support up to 10-A dual-channel loads for high-end infotainment systems and other noise-sensitive systems. The LM53600-Q1 and LM53601-Q1 support 650-mA and 1-A load current, respectively, for emerging advanced driver assistance (ADAS) systems. The LM53602-Q1 and LM53603-Q1 deliver 2-A and 3-A loads, respectively, for higher-current ADAS and infotainment systems.

Availability and Pricing

Available in volume now from TI and its authorized distributors, the LM5140-Q1 is packaged in an 8-pin, 6-mm by 6-mm by 0.9-mm VQFN package and priced at $3.90 in 1,000-unit quantities.


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