Product details

Vin (Min) (V) 3 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 35 Iout (Max) (A) 3 Iq (Typ) (uA) 1.5 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2200 Features Enable, Fixed Output, Light Load Efficiency, Over Current Protection, Power Good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
Vin (Min) (V) 3 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 35 Iout (Max) (A) 3 Iq (Typ) (uA) 1.5 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2200 Features Enable, Fixed Output, Light Load Efficiency, Over Current Protection, Power Good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
  • 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 VIN, 3.3-V, and 5-V fixed VOUT options available
  • One of the industry’s lowest IQ:
    • Ultra-low 1.5-µA IQ (switching) at 13.5 VIN, 3.3 V fixed VOUT and IQ < 3 µA at 150°C
    • Greater than 85% efficiency at 1 mA
  • Miniature solution size and low component cost:
    • One of the industry’s smallest solution size with the highest power density and performance
    • Integrated input bypass capacitors and bootstrap capacitor reducing EMI
    • 2.6-mm × 2.6-mm enhanced QFN package with wettable flanks
    • Internal compensation
  • Optimized for ultra-low EMI requirements:
    • Dual random spread spectrum (DRSS) for enhanced EMI performance across low and high-frequency bands
    • Enhanced QFN package minimizes switch node ringing
    • Adjustable FSW: 200 kHz–2.2 MHz with RT pin
  • 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 VIN, 3.3-V, and 5-V fixed VOUT options available
  • One of the industry’s lowest IQ:
    • Ultra-low 1.5-µA IQ (switching) at 13.5 VIN, 3.3 V fixed VOUT and IQ < 3 µA at 150°C
    • Greater than 85% efficiency at 1 mA
  • Miniature solution size and low component cost:
    • One of the industry’s smallest solution size with the highest power density and performance
    • Integrated input bypass capacitors and bootstrap capacitor reducing EMI
    • 2.6-mm × 2.6-mm enhanced QFN package with wettable flanks
    • Internal compensation
  • Optimized for ultra-low EMI requirements:
    • Dual random spread spectrum (DRSS) for enhanced EMI performance across low and high-frequency bands
    • Enhanced QFN package minimizes switch node ringing
    • Adjustable FSW: 200 kHz–2.2 MHz with RT pin

The LMQ664x0 is the industry’s 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 QFN package. This easy-to-use converter supports a wide input voltage range of 2.7 V to 36 V (after start-up or once 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 VIN 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 QFN package, and an optimized pin-out. The MODE/SYNC and RT pin variants 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 (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’s 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 QFN package. This easy-to-use converter supports a wide input voltage range of 2.7 V to 36 V (after start-up or once 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 VIN 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 QFN package, and an optimized pin-out. The MODE/SYNC and RT pin variants 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 (optimal pin FMEA). The rich feature set of the LMQ664x0 is designed to simplify implementation for a wide range of industrial end equipment.

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* 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 PDF | HTML 07 Feb 2022
Technical article How buck regulators with integrated capacitors help lower EMI and save board space 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
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019

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Evaluation board

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

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 (...)

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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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