LMQ66420-Q1 Series

Automotive, 36-V, 2-A low-EMI synchronous step-down converter with 1.5-µA IQ

Catalog

Automotive, 36-V, 2-A low-EMI synchronous step-down converter with 1.5-µA IQ

Part	Function	Voltage - Output (Max)	Topology	Current - Output	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Output Type	Mounting Type	Frequency - Switching	Voltage - Output (Min/Fixed)	Output Configuration	Voltage - Input (Max) [Max]	Package / Case	Voltage - Input (Min) [Min]	Qualification	Voltage - Output (Min/Fixed)	Grade	Voltage - Output (Max) [Max]
Texas Instruments LMQ66420MA5RXBRQ1	Step-Down	5 V	Buck	2 A	150 °C	-40 °C	1	Adjustable (Fixed)	Surface Mount Wettable Flank	400 kHz	1 V	Positive	36 V	14-PowerTFQFN
Texas Instruments LMQ66420MC3RXBRQ1	Step-Down		Buck	2 A	150 °C	-40 °C	1	Adjustable (Fixed)	Surface Mount Wettable Flank	2.2 MHz	1 V	Positive	36 V	14-PowerTFQFN	3 V	AEC-Q100	3.3 V	Automotive	18 V
Texas Instruments LMQ66420MA3RXBRQ1	Step-Down		Buck	2 A	150 °C	-40 °C	1	Adjustable (Fixed)	Surface Mount Wettable Flank	400 kHz	1 V	Positive	36 V	14-PowerTFQFN	3 V	AEC-Q100	3.3 V	Automotive	18 V

Catalog

Automotive, 36-V, 2-A low-EMI synchronous step-down converter with 1.5-µA IQ

Key Features

• Functional Safety-CapableDocumentation available to aid functional safety system designAEC-Q100-qualified for automotive applications:Temperature grade 1: –40°C to +125°C, TAOptimized for low EMI requirements:Facilitates CISPR 25 class 5 complianceIntegrated bypass and boot capacitors reduce EMIDual random spread spectrum reduces peak emissionsEnhanced HotRod™ QFN package minimizes switch node ringingGreater than 85% efficiency at 1mADesigned for automotive applications:Junction temperature range: –40°C to +150°CNC pin between critical pins for better reliabilityBest in-class pin FMEASupports 42V automotive load dump transientsSupports 3VIN for automotive cold crankMiniature design size and low component cost:Integrated input bypass capacitors and bootstrap capacitor reducing EMI2.6mm × 2.6mm enhanced HotRod QFN package with wettable flanksInternal control loop compensationFunctional Safety-CapableDocumentation available to aid functional safety system designAEC-Q100-qualified for automotive applications:Temperature grade 1: –40°C to +125°C, TAOptimized for low EMI requirements:Facilitates CISPR 25 class 5 complianceIntegrated bypass and boot capacitors reduce EMIDual random spread spectrum reduces peak emissionsEnhanced HotRod™ QFN package minimizes switch node ringingGreater than 85% efficiency at 1mADesigned for automotive applications:Junction temperature range: –40°C to +150°CNC pin between critical pins for better reliabilityBest in-class pin FMEASupports 42V automotive load dump transientsSupports 3VIN for automotive cold crankMiniature design size and low component cost:Integrated input bypass capacitors and bootstrap capacitor reducing EMI2.6mm × 2.6mm enhanced HotRod QFN package with wettable flanksInternal control loop compensation

Description

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). 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). The rich feature set of the LMQ664x0-Q1 is designed to simplify implementation for a wide range of automotive end equipment.