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LMR60440-Q1

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Automotive, 36V, 4A synchronous buck converter with low Iq and high efficiency with minimized COUT

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Data sheet

LMR60440-Q1

PREVIEW
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, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, 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, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, 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
  • 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, 3.8V/ADJ, and 5V/ADJ
    • Adjustable output voltage range from 1V to 20V
  • Low minimum on time tON (30ns typical)
  • Optimized for low electromagnetic interference (EMI) requirements:
    • Facilitates CISPR 25 class 5 compliance
    • Low inductance HotRod™ QFN package
    • Advanced spread spectrum options available
  • Switching frequency from 200kHz – 2.2MHz
  • FPWM, PFM, or external frequency synchronization available
  • Ultra-low quiescent current
    • Shutdown current: 0.7µA
    • No load standby current: 5µA
  • Optimized control loop for low output capacitance
  • Designed for scalable power supplies
  • Power-Good output for power sequencing
  • 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, 3.8V/ADJ, and 5V/ADJ
    • Adjustable output voltage range from 1V to 20V
  • Low minimum on time tON (30ns typical)
  • Optimized for low electromagnetic interference (EMI) requirements:
    • Facilitates CISPR 25 class 5 compliance
    • Low inductance HotRod™ QFN package
    • Advanced spread spectrum options available
  • Switching frequency from 200kHz – 2.2MHz
  • FPWM, PFM, or external frequency synchronization available
  • Ultra-low quiescent current
    • Shutdown current: 0.7µA
    • No load standby current: 5µA
  • Optimized control loop for low output capacitance
  • Designed for scalable power supplies
  • Power-Good output for power sequencing

The LMR60440-Q1 is a 3V to 36V (42V transient), 4A, automotive-grade synchronous buck converter. The LMR60440-Q1 is available in an ultra compact 2.5mm × 2mm HotRod™ QFN-9 package or 3.5mm × 2.5mm HotRod ™QFN-11 packagewith wettable flanks available, that helps minimize inductance and achieve low EMI performance to facilitate qualification of automotive and other 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 LMR60440-Q1 allows the user to select between forced pulse width modulation (FPWM), auto mode, or external synchronization mode of operation.

The LMR60440-Q1 is designed to offer reduced output capacitance leading to compact PCB layout and system cost savings. The LMR60440-Q1 is a part of a family of pin-compatible devices ranging in current levels from 0.6A to 6A.

The LMR60440-Q1 is a 3V to 36V (42V transient), 4A, automotive-grade synchronous buck converter. The LMR60440-Q1 is available in an ultra compact 2.5mm × 2mm HotRod™ QFN-9 package or 3.5mm × 2.5mm HotRod ™QFN-11 packagewith wettable flanks available, that helps minimize inductance and achieve low EMI performance to facilitate qualification of automotive and other 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 LMR60440-Q1 allows the user to select between forced pulse width modulation (FPWM), auto mode, or external synchronization mode of operation.

The LMR60440-Q1 is designed to offer reduced output capacitance leading to compact PCB layout and system cost savings. The LMR60440-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 LMR60440-Q1 3V to 36V, 4A , Automotive, Synchronous Buck Converter Optimized for High Power Density, Low EMI, and Low Output Capacitance datasheet (Rev. A) PDF | HTML 10 Mar 2026
Functional safety information LMR604x0, LMR604x0-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 12 Dec 2024

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Evaluation board

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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LMR604X0-CALC — LMR604x0 Design Calculator

Quickstart design calculator for the LMR604x0 family
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