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TI’s new Vin DC/DC controller features industry’s highest 65-V operation

DC-DC Buck Convertor

Texas Instruments introduces a 2.2-MHz, dual-channel synchronous buck converter. Integrated with unique set of features which significantly reduces 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.

Together with TI’s WEBENCH Automotive Design tool, the LM5140-Q1 enables engineers to get their automotive designs to market faster.

The LM5140-Q1 controller includes dual outputs with phase interleaving and is offered in wettable flank packaging that speeds manufacturing.

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-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-uA 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 company touts that the LM5140-Q1 will join 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.

Part numberOperating voltage range (abs max)Operating frequencyIQ (operating/ shutdown)Package
LM5140-Q13.8 V-65 V (70 V)2.2 MHz or 440 kHz35 uA/9 uA40-pin VQFN*
LM53600-Q13.5 V-36 V (42 V)2.1 MHz23 uA/1.8 uA10-pin WSON*
LM53601-Q13.5 V-36 V (42 V)2.1 MHz23 uA/1.8 uA10-pin WSON*
LM53602-Q13.5 V-36 V (42 V)2.1 MHz24 uA/1.7 uA16-pin HTSSOP
LM53603-Q13.5 V-36 V (42 V)2.1 MHz24 uA/1.7 uA16-pin HTSSOP

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.

See a live demonstration of the LM5140-Q1 and LM53601-Q buck converters in TI’s booth (No. 1617) at the Applied Power Electronics Conference (APEC), March 21-23 in Long Beach, California.

Availability, Packaging 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 very thin quad flat no-lead (VQFN) package and priced atUS$3.90 in 1,000-unit quantities.

TO order LM5140-Q1 evaluation module and download the LM5140-Q1 quick-start DC/DC synchronous buck converter design tool.

Web: www.ti.com

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