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LM654B0-Q1

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Automotive, 36VIN, 20A synchronous step-down converter for high efficiency and low EMC

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LM654B0-Q1

ACTIVE
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Product details

Rating Automotive Topology Buck Iout (max) (A) 20 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 32 Vout (min) (V) 1 Features Adjustable soft start, Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Over Current Protection, Power good, Stackable, Thermal shutdown, UVLO adjustable EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000021 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
Rating Automotive Topology Buck Iout (max) (A) 20 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 32 Vout (min) (V) 1 Features Adjustable soft start, Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Over Current Protection, Power good, Stackable, Thermal shutdown, UVLO adjustable EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.0000021 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
WQFN-FCRLF (VDA) 26 20.25 mm² (4.5 mm × 4.5 mm)
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Built in clocking for stacking of converters
  • Internal or external compensation
  • Pin selectable output voltage 3.3V and 5V fixed or adjustable from 0.8V to 0.9 × VIN
  • Wide input voltage range: 3V to 36V
  • Mitigated interference and noise technology – architecture 1 (MINT 1)
    • Optimized for low EMI requirements
    • Facilitates CISPR 25 Class 5 compliance
    • Mode pin configurable +8.5% or +17% dual-random spread spectrum reducing peak emissions
    • Enhanced HotRod™ QFN package with symmetrical pinout
  • Switching frequency from 300kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
    • Can be synchronized to external clock
  • Low minimum on time: 32ns (typical)
    • Enables 36V to 3.3V conversion at 2.2MHz
  • High-efficiency and high power density
    • > 94% efficiency at 12VIN to 5VOUT, IOUT = 15A, 400kHz
    • 8µA PFM no-load input current with bias pin at VOUT
    • 4.5mm × 4.5mm eQFN-26 with wettable flanks
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Built in clocking for stacking of converters
  • Internal or external compensation
  • Pin selectable output voltage 3.3V and 5V fixed or adjustable from 0.8V to 0.9 × VIN
  • Wide input voltage range: 3V to 36V
  • Mitigated interference and noise technology – architecture 1 (MINT 1)
    • Optimized for low EMI requirements
    • Facilitates CISPR 25 Class 5 compliance
    • Mode pin configurable +8.5% or +17% dual-random spread spectrum reducing peak emissions
    • Enhanced HotRod™ QFN package with symmetrical pinout
  • Switching frequency from 300kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
    • Can be synchronized to external clock
  • Low minimum on time: 32ns (typical)
    • Enables 36V to 3.3V conversion at 2.2MHz
  • High-efficiency and high power density
    • > 94% efficiency at 12VIN to 5VOUT, IOUT = 15A, 400kHz
    • 8µA PFM no-load input current with bias pin at VOUT
    • 4.5mm × 4.5mm eQFN-26 with wettable flanks

The LM654xx-Q1 is a buck converter family designed for high efficiency, high-power density, and low EMI performance with mitigated interference and noise technology (MINT 1) switcher technology for automotive applications. The converter operates over a wide input voltage range of 3V to 36V with pin selectable fixed output voltages of 3.3V and 5V or an adjustable output.

The low EMI operation is enabled with minimized loop inductance, optimized SW node slew-rate, and pin-selectable +8.5% or +17% dual-random spread spectrum (DRSS). The DRSS significantly reduces peak emissions through a combination of triangular and pseudo-random modulation while keeping output voltage ripple very low.

The current-mode control architecture with 32ns typical minimum on-time allows high conversion ratios at high frequencies, fast transient response, and excellent load and line regulation.

The LM654xx-Q1 is a buck converter family designed for high efficiency, high-power density, and low EMI performance with mitigated interference and noise technology (MINT 1) switcher technology for automotive applications. The converter operates over a wide input voltage range of 3V to 36V with pin selectable fixed output voltages of 3.3V and 5V or an adjustable output.

The low EMI operation is enabled with minimized loop inductance, optimized SW node slew-rate, and pin-selectable +8.5% or +17% dual-random spread spectrum (DRSS). The DRSS significantly reduces peak emissions through a combination of triangular and pseudo-random modulation while keeping output voltage ripple very low.

The current-mode control architecture with 32ns typical minimum on-time allows high conversion ratios at high frequencies, fast transient response, and excellent load and line regulation.
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Functional safety information LM6x4xx Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML Jun 30, 2026

Design & development

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Evaluation board

LM654B0EVM-1PH — LM654B0-Q1 evaluation module

The Texas Instruments LM654B0EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LM654xx family of wide input voltage buck converters. The LM654xx family are easy to use synchronous step-down converters capable of supplying up to 10A, 12A, 15A, or 20A of load (...)
User guide: PDF | HTML
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Design tool

LM654XXDESIGN-CALC — LM654XX-Q1 QuickStart design tool

QuickStart design calculator for the LM654XX-Q1
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WQFN-FCRLF (VDA) 26 Ultra Librarian
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