LMR66430-Q1 Series

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

Catalog

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

Part	Number of Outputs	Voltage - Output (Max) [Max]	Current - Output	Function	Operating Temperature [Min]	Operating Temperature [Max]	Output Type	Package / Case	Voltage - Output (Min/Fixed)	Output Configuration	Mounting Type	Topology	Voltage - Input (Max) [Max]	Frequency - Switching	Voltage - Output (Max)
Texas Instruments LMR66430MC3RXBRQ1	1	3.3 V	3 A	Step-Down	-40 °C	125 °C	Adjustable (Fixed)	14-PowerTFQFN	1 V	Positive	Surface Mount Wettable Flank	Buck	36 V	2.2 MHz
Texas Instruments LMR66430MB3RXBR	1	3.3 V	3 A	Step-Down	-40 °C	125 ¯C	Adjustable (Fixed)	14-PowerTFQFN	1 V	Positive	Surface Mount Wettable Flank	Buck	36 V
Texas Instruments LMR66430R5RXBR	1		3 A	Step-Down	-40 °C	125 ¯C	Adjustable (Fixed)	14-PowerTFQFN	1 V	Positive	Surface Mount Wettable Flank	Buck	36 V		5 V

Catalog

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

Key Features

• Functional Safety-CapableDocumentation available to aid functional safety system designDesigned for industrial applications:Junction temperature range –40°C to +150°CNC pin between critical pins for better reliabilityBest in-class pin FMEAInput transient protection up to 42 VWide input voltage range after start-up: 2.7 V (falling threshold) to 36 VAdjustable output up to 95% of VIN, 3.3-V, and 5-V fixed VOUT options availableOptimized for low EMI requirements:Dual random spread spectrum reduces peak emissionsEnhanced HotRod™ QFN package minimizes switch node ringingGreater than 85% efficiency at 1 mAMiniature design size and low component cost:2.6-mm × 2.6-mm enhanced HotRod QFN package with wettable flanksInternal control loop compensationFunctional Safety-CapableDocumentation available to aid functional safety system designDesigned for industrial applications:Junction temperature range –40°C to +150°CNC pin between critical pins for better reliabilityBest in-class pin FMEAInput transient protection up to 42 VWide input voltage range after start-up: 2.7 V (falling threshold) to 36 VAdjustable output up to 95% of VIN, 3.3-V, and 5-V fixed VOUT options availableOptimized for low EMI requirements:Dual random spread spectrum reduces peak emissionsEnhanced HotRod™ QFN package minimizes switch node ringingGreater than 85% efficiency at 1 mAMiniature design size and low component cost:2.6-mm × 2.6-mm enhanced HotRod QFN package with wettable flanksInternal control loop compensation

Description

The LMR664x0 is a small 36-V, 3-A (available in 2-A and 1-A variants) synchronous step-down DC/DC converter 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 LMR664x0 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 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 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 LMR664x0 is designed to simplify implementation for a wide range of industrial end equipment. The LMR664x0 is a small 36-V, 3-A (available in 2-A and 1-A variants) synchronous step-down DC/DC converter 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 LMR664x0 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 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 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 LMR664x0 is designed to simplify implementation for a wide range of industrial end equipment.