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LMQ66430-Q1

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Automotive 36-V, 3-A low EMI synchronous step-down converter with 1.5-µA IQ

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Data sheet

LMQ66430-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck Iout (max) (A) 3 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 35 Vout (min) (V) 1 EMI features Integrated capacitors, Low parasitic Hotrod packaging, Spread Spectrum Features Enable, Fixed Output, Fixed soft start, Forced PWM, Frequency synchronization, Light-load efficiency, Overcurrent protection, Power good, Spread Spectrum, Synchronous rectification, UVLO adjustable, Wettable flanks package Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000015 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
Rating Automotive Topology Buck Iout (max) (A) 3 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 35 Vout (min) (V) 1 EMI features Integrated capacitors, Low parasitic Hotrod packaging, Spread Spectrum Features Enable, Fixed Output, Fixed soft start, Forced PWM, Frequency synchronization, Light-load efficiency, Overcurrent protection, Power good, Spread Spectrum, Synchronous rectification, UVLO adjustable, Wettable flanks package Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000015 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
VQFN-FCRLF (RXB) 14 6.76 mm² 2.6 x 2.6
  • Functional Safety-Capable
  • AEC-Q100-qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • ZEN 2 switcher
    • Facilitates CISPR 25 class 5 compliance
    • Integrated bypass and boot capacitors reduce EMI
    • Dual random spread spectrum reduces peak emissions
    • Enhanced HotRod™ QFN package minimizes switch node ringing
  • Greater than 85% efficiency at 1mA
  • Designed for automotive applications:
    • Junction temperature range: –40°C to +150°C
    • NC pin between critical pins for better reliability
    • Best in-class pin FMEA
    • Supports 42V automotive load dump transients
    • Supports 3VIN for automotive cold crank
  • Miniature design size and low component cost:
    • Integrated input bypass capacitors and bootstrap capacitor reducing EMI
    • 2.6mm × 2.6mm enhanced HotRod QFN package with wettable flanks
    • Internal control loop compensation
  • Functional Safety-Capable
  • AEC-Q100-qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • ZEN 2 switcher
    • Facilitates CISPR 25 class 5 compliance
    • Integrated bypass and boot capacitors reduce EMI
    • Dual random spread spectrum reduces peak emissions
    • Enhanced HotRod™ QFN package minimizes switch node ringing
  • Greater than 85% efficiency at 1mA
  • Designed for automotive applications:
    • Junction temperature range: –40°C to +150°C
    • NC pin between critical pins for better reliability
    • Best in-class pin FMEA
    • Supports 42V automotive load dump transients
    • Supports 3VIN for automotive cold crank
  • Miniature design size and low component cost:
    • Integrated input bypass capacitors and bootstrap capacitor reducing EMI
    • 2.6mm × 2.6mm enhanced HotRod QFN package with wettable flanks
    • Internal control loop compensation

The LMQ664x0-Q1 is the industry smallest 36V, 3A (available in 2A and 1A variants) synchronous step-down DC/DC converter with an integrated bypass and bootstrap capacitor in an enhanced HotRod QFN package. This easy-to-use converter supports a wide input voltage range of 2.7V to 36V (after start-up or after operating) with transients up to 42V.

The LMQ664x0-Q1 is specifically designed to meet low standby power requirements for always-on, automotive applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded typical current consumption of 1.5µA at 13.5VIN and high light load efficiency. A seamless transition between PWM and PFM modes along with very low MOSFET ON resistances makes sure there is exceptional efficiency across the entire load range. The control architecture (peak current mode) and feature set are optimized for an ultra-small design size with minimal output capacitance. The device minimizes input filter size by using dual-random spread spectrum (DRSS), a low-EMI enhanced HotRod QFN package, and an optimized pinout. The MODE/SYNC pin can be used to set or synchronize the frequency to avoid noise sensitive frequency bands. There are NC pins between critical high voltage pins, reducing potential failures (excellent choice pin FMEA). ZEN 2 switcher features enable the device to support ultra low-EMI applications. The rich feature set of the LMQ664x0-Q1 is designed to simplify implementation for a wide range of automotive end equipment.

The LMQ664x0-Q1 is the industry smallest 36V, 3A (available in 2A and 1A variants) synchronous step-down DC/DC converter with an integrated bypass and bootstrap capacitor in an enhanced HotRod QFN package. This easy-to-use converter supports a wide input voltage range of 2.7V to 36V (after start-up or after operating) with transients up to 42V.

The LMQ664x0-Q1 is specifically designed to meet low standby power requirements for always-on, automotive applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded typical current consumption of 1.5µA at 13.5VIN and high light load efficiency. A seamless transition between PWM and PFM modes along with very low MOSFET ON resistances makes sure there is exceptional efficiency across the entire load range. The control architecture (peak current mode) and feature set are optimized for an ultra-small design size with minimal output capacitance. The device minimizes input filter size by using dual-random spread spectrum (DRSS), a low-EMI enhanced HotRod QFN package, and an optimized pinout. The MODE/SYNC pin can be used to set or synchronize the frequency to avoid noise sensitive frequency bands. There are NC pins between critical high voltage pins, reducing potential failures (excellent choice pin FMEA). ZEN 2 switcher features enable the device to support ultra low-EMI applications. The rich feature set of the LMQ664x0-Q1 is designed to simplify implementation for a wide range of automotive end equipment.
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Technical documentation

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Type Title Date
* Data sheet LMQ664x0-Q1 36V, 1A, 2A, and 3A, Ultra-Small, Synchronous Automotive ZEN 2 Step-Down Converter With Integrated VIN Bypass and CBOOT Capacitors datasheet (Rev. E) PDF | HTML 09 Dec 2025
Functional safety information LMQ664x0 and LMQ664x0-Q1 Functional Safety FIT Rate, FMD and Pin FMA (Rev. A) PDF | HTML 05 Nov 2024
White paper 解決 Nano IQ 系統的性能挑戰 (Rev. A) PDF | HTML 25 Mar 2024
White paper 나노-IQ 시스템의 성능 문제 해결 (Rev. A) PDF | HTML 25 Mar 2024
White paper Addressing Performance Challenges in Nano-IQ Systems (Rev. A) PDF | HTML 11 Mar 2024
Application brief Step-Down Converter Capacitor Integration Reducing Effort for CISPR 25 Class 5 Compliance PDF | HTML 18 Jan 2023
Technical article How buck regulators with integrated capacitors help lower EMI and save board space PDF | HTML 16 Mar 2022
EVM User's guide LMQ66430-Q1 Buck Controller Evaluation Module User's Guide PDF | HTML 02 Feb 2022
Certificate LMQ66430EVM-2M EU RoHS Declaration of Conformity (DoC) 21 Oct 2021

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMQ66430-2EVM — LMQ66430 evaluation module for 36-V 3-A synchronous step-down converter with enhanced HotRod™ QFN

The LMQ66430-2EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMQ66430-Q1 device, a synchronous step-down DC/DC converter capable of driving up to 3 A of load current from an input voltage of up to 36 V. The LMQ66430-Q1 has ultra-low operating quiescent (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

LMQ66430-Q1 PSpice Transient Model

SNVMCB0.ZIP (161 KB) - PSpice Model
Download
Gerber file

LMQ66430-Q1 EVM Design Files

SNVC249.ZIP (3959 KB)
Download
Reference designs

TIDA-050071 — Off-battery processor power reference design for ADAS and infotainment applications

The automotive off-battery processor power reference design provides a versatile protected power tree for supplying common Advanced Driver Assistance Systems (ADAS) and infotainment processors, such as TDA4x-Q1 and AM6x-Q1. The processors described work with sensor fusion systems, camera modules (...)
Design guide: PDF
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VQFN-FCRLF (RXB) 14 Ultra Librarian
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