LM64460-Q1 Series

Automotive 3-V to 36-V, 6-A, low EMI synchronous step-down converter

Catalog

Automotive 3-V to 36-V, 6-A, low EMI synchronous step-down converter

Part	Function	Voltage - Output (Min/Fixed)	Current - Output	Number of Outputs	Grade	Voltage - Input (Max) [Max]	Topology	Supplier Device Package	Supplier Device Package [x]	Supplier Device Package [y]	Frequency - Switching	Mounting Type	Voltage - Input (Min) [Min]	Output Configuration	Qualification	Synchronous Rectifier	Package / Case	Output Type	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Output (Max) [Max]	Output Type
Texas Instruments LM64460CPPQRYFRQ1	Step-Down	5 V	6 A	1	Automotive	36 V	Buck	22-VQFN-HR	3.5	4	2.1 MHz	Surface Mount Wettable Flank	3 V	Positive	AEC-Q100		22-PowerTFQFN	1.81 mOhm	150 °C	-40 °C
Texas Instruments LM64460APPQRYFRQ1	Step-Down	1 V	6 A	1	Automotive	36 V	Buck	22-VQFN-HR	3.5	4	2.1 MHz	Surface Mount Wettable Flank	3 V	Positive	AEC-Q100		22-PowerTFQFN		150 °C	-40 °C	34.2 V	Adjustable

Catalog

Automotive 3-V to 36-V, 6-A, low EMI synchronous step-down converter

Key Features

• AEC-Q100 qualified for automotive applicationsDevice temperature grade 1: –40°C to +125°C ambient operating temperatureFunctional Safety-CapableDocumentation available to aid functional safety system designVersatile synchronous buck DC/DC converterWide input voltage range of 3V to 36V with tolerance for load-dump transients up to 42V4A and 6A options available1% accurate, fixed 3.3V, 5V, or adjustable output voltage from 1V to 95% VIN150°C maximum junction temperatureFixed 2.1MHz switching frequency (adjustable from 200kHz to 2.2MHz using a SYNC signal)Improved reliability with optimized pinout design and clearance for short-circuit-to-adjacent-pin testDesigned for low EMI requirementsEnhanced HotRod™ QFN package with dual input paths reduces switch-node ringingPin-configurable spread spectrum modulationSelectable FPWM or PFM mode at light loadsHigh efficiency across the full load range92.5% at 13.5VIN, 5VOUT, 6A, 2.1MHz7µA typical at 3.3VOUT no-load input current0.6µA typical shutdown quiescent current0.6V typical dropout at full loadExternal bias option for improved efficiencyCreate a custom regulator design using the LM644x0-Q1 withWEBENCH Power DesignerAEC-Q100 qualified for automotive applicationsDevice temperature grade 1: –40°C to +125°C ambient operating temperatureFunctional Safety-CapableDocumentation available to aid functional safety system designVersatile synchronous buck DC/DC converterWide input voltage range of 3V to 36V with tolerance for load-dump transients up to 42V4A and 6A options available1% accurate, fixed 3.3V, 5V, or adjustable output voltage from 1V to 95% VIN150°C maximum junction temperatureFixed 2.1MHz switching frequency (adjustable from 200kHz to 2.2MHz using a SYNC signal)Improved reliability with optimized pinout design and clearance for short-circuit-to-adjacent-pin testDesigned for low EMI requirementsEnhanced HotRod™ QFN package with dual input paths reduces switch-node ringingPin-configurable spread spectrum modulationSelectable FPWM or PFM mode at light loadsHigh efficiency across the full load range92.5% at 13.5VIN, 5VOUT, 6A, 2.1MHz7µA typical at 3.3VOUT no-load input current0.6µA typical shutdown quiescent current0.6V typical dropout at full loadExternal bias option for improved efficiencyCreate a custom regulator design using the LM644x0-Q1 withWEBENCH Power Designer

Description

The LM644x0-Q1 derives from a family of automotive, synchronous, buck, DC/DC converters with excellent efficiency and ultra-low IQ. With integrated high-side and low-side MOSFETs, up to 6A of output current is delivered over a wide input voltage range from 3V to 36V, with support for load-dump transients up to 42V. The converter implements soft recovery from dropout to eliminate overshoot on the output. The LM644x0-Q1 incorporates numerous features for excellent EMI performance, including spread-spectrum frequency modulation, a low-EMI Enhanced HotRod QFN package that mitigates switch-node ringing, and a symmetrical pinout for excellent input capacitor placement. The switching frequency is synchronizable between 200kHz and 2.2MHz to avoid sensitive frequency bands, while optimizing efficiency or design size based on the specific requirements of the application. PFM mode enables frequency foldback during light-load operation, allowing an unloaded current consumption of only 7µA (typical) and high light-load efficiency. A seamless transition between PWM and PFM modes, along with low MOSFET on-resistances and an external bias input, provides exceptional efficiency and thermal performance across the entire load range. The package has several NC pins between critical power pins, which improve the Failure Modes and Effects Analysis (FMEA) result. The LM644x0-Q1 derives from a family of automotive, synchronous, buck, DC/DC converters with excellent efficiency and ultra-low IQ. With integrated high-side and low-side MOSFETs, up to 6A of output current is delivered over a wide input voltage range from 3V to 36V, with support for load-dump transients up to 42V. The converter implements soft recovery from dropout to eliminate overshoot on the output. The LM644x0-Q1 incorporates numerous features for excellent EMI performance, including spread-spectrum frequency modulation, a low-EMI Enhanced HotRod QFN package that mitigates switch-node ringing, and a symmetrical pinout for excellent input capacitor placement. The switching frequency is synchronizable between 200kHz and 2.2MHz to avoid sensitive frequency bands, while optimizing efficiency or design size based on the specific requirements of the application. PFM mode enables frequency foldback during light-load operation, allowing an unloaded current consumption of only 7µA (typical) and high light-load efficiency. A seamless transition between PWM and PFM modes, along with low MOSFET on-resistances and an external bias input, provides exceptional efficiency and thermal performance across the entire load range. The package has several NC pins between critical power pins, which improve the Failure Modes and Effects Analysis (FMEA) result.