Home Power management AC/DC & DC/DC converters (integrated FET)
Home
Power management
AC/DC & DC/DC converters (integrated FET)

LMQ66430

ACTIVE

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

Order now
Data sheet

LMQ66430

ACTIVE
Data sheet Order now

Product details

Iout (max) (A) 3 Vin (min) (V) 3 Vin (max) (V) 36 Topology Buck Type Converter Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Fixed Output, Light Load Efficiency, Low Noise, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification Control mode current mode Vout (min) (V) 1 Vout (max) (V) 35 Rating Catalog Operating temperature range (°C) -40 to 125
Iout (max) (A) 3 Vin (min) (V) 3 Vin (max) (V) 36 Topology Buck Type Converter Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Fixed Output, Light Load Efficiency, Low Noise, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification Control mode current mode Vout (min) (V) 1 Vout (max) (V) 35 Rating Catalog Operating temperature range (°C) -40 to 125
VQFN-FCRLF (RXB) 14 6.76 mm² 2.6 x 2.6
  • Functional Safety-Capable
  • Designed for industrial applications:
    • Junction temperature range –40°C to +150°C
    • NC pin between critical pins for better reliability
    • Best in-class pin FMEA
    • Input transient protection up to 42 V
    • Wide input voltage range after start-up: 2.7 V (falling threshold) to 36 V
    • Adjustable output up to 95% of V IN, 3.3-V, and 5-V fixed V OUT options available
  • Optimized for low EMI requirements:
    • Integrated bypass and boot capacitors reduce EMI
    • Dual Random Spread Spectrum reduces peak emissions
    • Enhanced HotRod™ QFN package minimizes switch node ringing
    • Adjustable F SW: 200 kHz – 2.2 MHz with RT pin
  • Greater than 85% efficiency at 1 mA
  • Miniature solution size and low component cost:
    • Integrated input bypass capacitors and bootstrap capacitor reducing EMI
    • 2.6-mm × 2.6-mm enhanced HotRod™ QFN package with wettable flanks
    • Internal control loop compensation
  • Functional Safety-Capable
  • Designed for industrial applications:
    • Junction temperature range –40°C to +150°C
    • NC pin between critical pins for better reliability
    • Best in-class pin FMEA
    • Input transient protection up to 42 V
    • Wide input voltage range after start-up: 2.7 V (falling threshold) to 36 V
    • Adjustable output up to 95% of V IN, 3.3-V, and 5-V fixed V OUT options available
  • Optimized for low EMI requirements:
    • Integrated bypass and boot capacitors reduce EMI
    • Dual Random Spread Spectrum reduces peak emissions
    • Enhanced HotRod™ QFN package minimizes switch node ringing
    • Adjustable F SW: 200 kHz – 2.2 MHz with RT pin
  • Greater than 85% efficiency at 1 mA
  • Miniature solution size and low component cost:
    • Integrated input bypass capacitors and bootstrap capacitor reducing EMI
    • 2.6-mm × 2.6-mm enhanced HotRod™ QFN package with wettable flanks
    • Internal control loop compensation

The LMQ664x0 is the industry smallest 36-V, 3-A (available in 2-A and 1-A 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 2.7 V to 36 V (after start-up or after operating) with transients up to 42 V.

The LMQ664x0 is specifically designed to meet low standby power requirements for always-on, industrial applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded typical current consumption of 1.5 µA at 13.5 V IN 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 solution 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 pin-out. The RT pin can be used to set the frequency to avoid noise sensitive frequency bands. There are NC pins between critical high voltage pins, reducing potential failures (optimal pin FMEA). The rich feature set of the LMQ664x0 is designed to simplify implementation for a wide range of industrial end equipment.

The LMQ664x0 is the industry smallest 36-V, 3-A (available in 2-A and 1-A 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 2.7 V to 36 V (after start-up or after operating) with transients up to 42 V.

The LMQ664x0 is specifically designed to meet low standby power requirements for always-on, industrial applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded typical current consumption of 1.5 µA at 13.5 V IN 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 solution 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 pin-out. The RT pin can be used to set the frequency to avoid noise sensitive frequency bands. There are NC pins between critical high voltage pins, reducing potential failures (optimal pin FMEA). The rich feature set of the LMQ664x0 is designed to simplify implementation for a wide range of industrial end equipment.
open-in-new Find other AC/DC & DC/DC converters (integrated FET)
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Pin-for-pin with same functionality to the compared device
NEW LMR66430 ACTIVE 36V, 3A synchronous step-down converter with 1.5uA IQ and low EMI Without integrated caps
Similar functionality to the compared device
NEW TPSM64406 ACTIVE High-density, 36V, 0.8V-to-16V output, dual 3A output power module Dual 3A output power module

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 6
Type Title Date
* Data sheet LMQ664x0, 36-V, 1-A, 2-A, and 3-A, Ultra-Small, Synchronous Step-Down Converter with Integrated VIN Bypass and CBOOT Capacitors datasheet (Rev. B) PDF | HTML 08 May 2023
Application brief Step-Down Converter Capacitor Integration Reducing Effort for CISPR 25 Class 5 Compliance PDF | HTML 18 Jan 2023
Functional safety information LMQ664x0 and LMQ664x0-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 16 Dec 2022
Technical article How buck regulators with integrated capacitors help lower EMI and save board space PDF | HTML 16 Mar 2022
User 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 PSpice Transient Model

SNVMCA9.ZIP (161 KB) - PSpice Model
Download
Package Pins Download
VQFN-FCRLF (RXB) 14 View options
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos