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LMR61440-Q1

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Automotive, 36VIN, 4A synchronous step-down converter for high efficiency and low output noise

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Data sheet

LMR61440-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck Iout (max) (A) 4 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 34 Vout (min) (V) 1 Features Enable, Fixed soft start, Frequency synchronization, Light-load efficiency, Overcurrent protection, Power good, Spread Spectrum, Synchronous rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000004 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
Rating Automotive Topology Buck Iout (max) (A) 4 Vin (max) (V) 36 Vin (min) (V) 3 Vout (max) (V) 34 Vout (min) (V) 1 Features Enable, Fixed soft start, Frequency synchronization, Light-load efficiency, Overcurrent protection, Power good, Spread Spectrum, Synchronous rectification, Wettable flanks package EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000004 Duty cycle (max) (%) 98 TI functional safety category Functional Safety-Capable
WQFN-HR (RAK) 9 5 mm² 2.5 x 2
  • Mitigated interference and noise technology – architecture 1 (MINT 1):
    • Low output noise optimized dual random spread spectrum (DRSS)
    • Facilitates CISPR 25 class 5 compliance
    • Low inductance HotRod™ QFN package
  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1: –40°C to 125°C ambient operating temperature range
  • Functional Safety-Capable
  • Wide operating input voltage: 3V to 36V (42V absolute maximum)
  • Programmable output voltage options available in fixed 3.3V/ADJ and 5V/ADJ
    • Adjustable output voltage range from 1V to 20V
  • Ultra-low quiescent current
    • Shutdown current: 0.75µA
    • No load standby current: 3.8µA
  • Optimized control loop for low output capacitance
  • Switching frequency from 200kHz – 2.2MHz
  • Low minimum tON (30ns typical)
  • FPWM, PFM, or external frequency synchronization available
  • Designed for scalable power supplies
  • Power-Good output for power sequencing
  • Mitigated interference and noise technology – architecture 1 (MINT 1):
    • Low output noise optimized dual random spread spectrum (DRSS)
    • Facilitates CISPR 25 class 5 compliance
    • Low inductance HotRod™ QFN package
  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1: –40°C to 125°C ambient operating temperature range
  • Functional Safety-Capable
  • Wide operating input voltage: 3V to 36V (42V absolute maximum)
  • Programmable output voltage options available in fixed 3.3V/ADJ and 5V/ADJ
    • Adjustable output voltage range from 1V to 20V
  • Ultra-low quiescent current
    • Shutdown current: 0.75µA
    • No load standby current: 3.8µA
  • Optimized control loop for low output capacitance
  • Switching frequency from 200kHz – 2.2MHz
  • Low minimum tON (30ns typical)
  • FPWM, PFM, or external frequency synchronization available
  • Designed for scalable power supplies
  • Power-Good output for power sequencing

The LMR61440-Q1 is a 3V to 36V (42V transient), 4A, synchronous buck converter in an ultra compact 2.5mm × 2mm QFN-9 package with wettable flanks. The LMR61440-Q1 with mitigated interference and noise technology using architecture 1 features (MINT 1) enables the device to achieve low EMI performance and low output noise to facilitate noise-sensitive designs.

All device variants are capable of output voltages ranging from 1V to 20V in adjustable output configuration. Each variant is also capable of delivering a fixed output voltage by connecting the output voltage node directly to the feedback pin. The Device Comparison Table provides details on the fixed output voltage options. The current-mode control architecture with 30ns minimum on-time allows high conversion ratios at high frequencies, fast transient response, and excellent load and line regulation.

Open drain power-good output facilitates power sequencing requirements. The MODE/SYNC pin of the LMR61440-Q1 allows the user to select between forced pulse width modulation (FPWM), auto mode, or external synchronization mode of operation.

The LMR61440-Q1 is designed to offer reduced output capacitance leading to compact PCB layout and system cost savings. The LMR61440-Q1 is a part of a family of pin-compatible devices ranging in current levels from 0.6A to 6A.

The LMR61440-Q1 is a 3V to 36V (42V transient), 4A, synchronous buck converter in an ultra compact 2.5mm × 2mm QFN-9 package with wettable flanks. The LMR61440-Q1 with mitigated interference and noise technology using architecture 1 features (MINT 1) enables the device to achieve low EMI performance and low output noise to facilitate noise-sensitive designs.

All device variants are capable of output voltages ranging from 1V to 20V in adjustable output configuration. Each variant is also capable of delivering a fixed output voltage by connecting the output voltage node directly to the feedback pin. The Device Comparison Table provides details on the fixed output voltage options. The current-mode control architecture with 30ns minimum on-time allows high conversion ratios at high frequencies, fast transient response, and excellent load and line regulation.

Open drain power-good output facilitates power sequencing requirements. The MODE/SYNC pin of the LMR61440-Q1 allows the user to select between forced pulse width modulation (FPWM), auto mode, or external synchronization mode of operation.

The LMR61440-Q1 is designed to offer reduced output capacitance leading to compact PCB layout and system cost savings. The LMR61440-Q1 is a part of a family of pin-compatible devices ranging in current levels from 0.6A to 6A.
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* Data sheet LMR61440-Q1 36V, 4A , MINT 1, Automotive Synchronous Buck Converter With Optimized Spread Spectrum for Flat Output Noise datasheet PDF | HTML 22 Jun 2026
Functional safety information LMR614x0-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 02 Jun 2026

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LMR60440QEVM — LMR60440-Q1 evaluation module

The LMR60440-Q1 is a 36V, 4A, DC/DC buck converter that features synchronous rectification to achieve high conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 8V to 36V to provide a regulated 3.3V output up to 4A load at 2.2MHz switching frequency. The (...)
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