2.2-MHz, low-quiescent-current buck converter significantly reduces system noise and saves space in sensitive automotive power-supply systems
Texas Instruments (TI) introduced a 2.2-MHz, dual-channel synchronous buck converter with a unique set of features designed to significantly reduce electromagnetic interference (EMI) and high-frequency noise in high-voltage DC/DC step-down applications such as automotive infotainment and high-end cluster power-supply systems. 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.
LM5140-Q1 key features and benefits:
- Wide 3.8-V to 65-V operating range handles start-stop and load-dump conditions for 12-V/24-V lead-acid and emerging 48-V Lithium-ion automotive batteries.
- 2.2-MHz operation with external synchronization capability moves switching noise above the sensitive AM band, eliminating the need for frequency hopping.
- Unique, 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.
- Low 35-µA quiescent current (IQ) in standby (one channel operating with no load) extends battery life in "always on" applications.
- 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.
Availability, packaging and pricing
Available in volume now from TI and its authorized distributors, the LM5140-Q1 is packaged in an 40-pin, 6-mm by 6-mm by 0.9-mm very thin quad flat no-lead (VQFN) package and priced at US$3.90 in 1,000-unit quantities. Order the LM5140-Q1 evaluation module and download the LM5140-Q1 quick-start DC/DC synchronous buck converter design tool.
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| The LM5140RWGEVM evaluation module. |
