LMQ66430-Q1

ACTIVE

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

Product details

Rating Automotive Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 3 Vin (min) (V) 3 Vin (max) (V) 36 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Fixed Output, Forced PWM, Frequency synchronization, Light Load Efficiency, Low Noise, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO adjustable, Wettable flanks package Control mode current mode Vout (min) (V) 1 Vout (max) (V) 35 Iq (typ) (µA) 1.5 Duty cycle (max) (%) 98
Rating Automotive Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 3 Vin (min) (V) 3 Vin (max) (V) 36 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Fixed Output, Forced PWM, Frequency synchronization, Light Load Efficiency, Low Noise, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO adjustable, Wettable flanks package Control mode current mode Vout (min) (V) 1 Vout (max) (V) 35 Iq (typ) (µA) 1.5 Duty cycle (max) (%) 98
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
  • Optimized for low EMI requirements:
    • 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 1 mA
  • 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 42-V automotive load dump transients
    • Supports 3-VIN for automotive cold crank
  • Miniature design 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
  • AEC-Q100-qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Optimized for low EMI requirements:
    • 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 1 mA
  • 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 42-V automotive load dump transients
    • Supports 3-VIN for automotive cold crank
  • Miniature design 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-Q1 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-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 1.5 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 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 pin-out. 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 (optimal pin FMEA). 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 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-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 1.5 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 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 pin-out. 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 (optimal pin FMEA). 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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Design & development

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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
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Simulation model

LMQ66430-Q1 PSpice Transient Model

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

LMQ66430-Q1 EVM Design Files

SNVC249.ZIP (3959 KB)
Package Pins CAD symbols, footprints & 3D models
VQFN-FCRLF (RXB) 14 Ultra Librarian

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