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LM64460-Q1

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

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Data sheet

LM64460-Q1

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 3 Vin (max) (V) 36 Vout (min) (V) 1 Vout (max) (V) 34.2 Iout (max) (A) 6 Iq (typ) (mA) 0.007 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 EMI features Low parasitic Hotrod packaging, Spread Spectrum Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package Operating temperature range (°C) -40 to 150 Rating Automotive TI functional safety category Functional Safety-Capable Regulated outputs (#) 1 Duty cycle (max) (%) 87 Type Converter
Vin (min) (V) 3 Vin (max) (V) 36 Vout (min) (V) 1 Vout (max) (V) 34.2 Iout (max) (A) 6 Iq (typ) (mA) 0.007 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 EMI features Low parasitic Hotrod packaging, Spread Spectrum Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package Operating temperature range (°C) -40 to 150 Rating Automotive TI functional safety category Functional Safety-Capable Regulated outputs (#) 1 Duty cycle (max) (%) 87 Type Converter
VQFN-FCRLF (RYF) 22 14 mm² 4 x 3.5
  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Versatile synchronous buck DC/DC converter
    • Wide input voltage range of 3 V to 36 V with tolerance for load-dump transients up to 42 V
    • 1% accurate, fixed 3.3-V, 5-V, or adjustable output voltage from 1 V to 95% V IN
    • 150°C maximum junction temperature
    • Fixed 2.1-MHz switching frequency (adjustable from 200 kHz to 2.2 MHz using a SYNC signal)
  • Improved reliability with optimized pinout design and clearance for short-circuit-to-adjacent-pin test
  • Optimized for low EMI requirements
    • Enhanced HotRod™ QFN package with dual input paths reduces switch-node ringing
    • Pin-configurable spread spectrum modulation
    • Selectable FPWM or PFM mode at light loads
  • High efficiency across the full load range
    • 92.5% at 13.5 V IN, 5 V OUT, 6 A, 2.1 MHz
    • No-load input current: 7-µA typical at 3.3 V OUT
    • Shutdown quiescent current: 0.6-µA typical
    • 0.6-V typical dropout at 6-A load
    • External bias option for improved efficiency
  • Create a custom regulator design using the LM64460-Q1 with WEBENCH Power Designer
  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Versatile synchronous buck DC/DC converter
    • Wide input voltage range of 3 V to 36 V with tolerance for load-dump transients up to 42 V
    • 1% accurate, fixed 3.3-V, 5-V, or adjustable output voltage from 1 V to 95% V IN
    • 150°C maximum junction temperature
    • Fixed 2.1-MHz switching frequency (adjustable from 200 kHz to 2.2 MHz using a SYNC signal)
  • Improved reliability with optimized pinout design and clearance for short-circuit-to-adjacent-pin test
  • Optimized for low EMI requirements
    • Enhanced HotRod™ QFN package with dual input paths reduces switch-node ringing
    • Pin-configurable spread spectrum modulation
    • Selectable FPWM or PFM mode at light loads
  • High efficiency across the full load range
    • 92.5% at 13.5 V IN, 5 V OUT, 6 A, 2.1 MHz
    • No-load input current: 7-µA typical at 3.3 V OUT
    • Shutdown quiescent current: 0.6-µA typical
    • 0.6-V typical dropout at 6-A load
    • External bias option for improved efficiency
  • Create a custom regulator design using the LM64460-Q1 with WEBENCH Power Designer

The LM64460-Q1 derives from a family of automotive synchronous buck DC/DC converters with excellent efficiency and ultra-low I Q. With integrated high-side and low-side MOSFETs, up to 6 A of output current is delivered over a wide input voltage range from 3 V to 36 V, with support for load-dump transients up to 42 V. The converter implements soft recovery from dropout to eliminate overshoot on the output.

The LM64460-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 ideal input capacitor placement. The switching frequency is synchronizable between 200 kHz and 2.2 MHz 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 7 µA (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 LM64460-Q1 derives from a family of automotive synchronous buck DC/DC converters with excellent efficiency and ultra-low I Q. With integrated high-side and low-side MOSFETs, up to 6 A of output current is delivered over a wide input voltage range from 3 V to 36 V, with support for load-dump transients up to 42 V. The converter implements soft recovery from dropout to eliminate overshoot on the output.

The LM64460-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 ideal input capacitor placement. The switching frequency is synchronizable between 200 kHz and 2.2 MHz 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 7 µA (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.
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Technical documentation

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Type Title Date
* Data sheet LM64460-Q13-V to 36-V, 6-AAutomotiveSynchronous Buck DC/DC ConverterWith Pin Selectable Light-Load Mode,Optimized for Reliability and Low EMI datasheet (Rev. A) PDF | HTML 02 Oct 2023
User guide LM63460-Q1 and LM64460-Q1 EVM User's Guide PDF | HTML 16 Dec 2021
Certificate LM64460EVM-2MHZ EU RoHS Declaration of Conformity (DoC) 09 Dec 2021
Functional safety information LM64460-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 27 Sep 2021

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LM63460-Q1, LM64460-Q1 EVM PCB Layout Files

SNVR515.ZIP (5089 KB)
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