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LMR60440-Q1

VORSCHAU

Synchroner Abwärtswandler, 36 V, 4 A, mit niedrigem Ruhestrom und hohem Wirkungsgrad

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Produktdetails

Rating Automotive Operating temperature range (°C) -40 to 125 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 4 Vin (min) (V) 3 Vin (max) (V) 36 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 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 Vout (min) (V) 1 Vout (max) (V) 34 Iq (typ) (µA) 4 Duty cycle (max) (%) 98
Rating Automotive Operating temperature range (°C) -40 to 125 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 4 Vin (min) (V) 3 Vin (max) (V) 36 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 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 Vout (min) (V) 1 Vout (max) (V) 34 Iq (typ) (µA) 4 Duty cycle (max) (%) 98
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)
  • Ultra-low quiescent current
    • Shutdown current: 0.65µA
    • No load standby current: 5µA
  • Pin 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 tON (30ns typical)
  • Optimized for low electromagnetic interference (EMI) requirements:
    • Facilitates CISPR 25 class 5 compliance
    • Low inductance HotRod™ QFN package
    • Spread spectrum options available
  • Programmable switching frequency from 200kHz – 2.2MHz
  • FPWM, PFM, or external frequency synchronization available
  • Designed for scalable power supplies
    • Pin compatible with LMR60406-Q1, LMR60410-Q1, LMR60420-Q1, and LMR60430-Q1
  • 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)
  • Ultra-low quiescent current
    • Shutdown current: 0.65µA
    • No load standby current: 5µA
  • Pin 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 tON (30ns typical)
  • Optimized for low electromagnetic interference (EMI) requirements:
    • Facilitates CISPR 25 class 5 compliance
    • Low inductance HotRod™ QFN package
    • Spread spectrum options available
  • Programmable switching frequency from 200kHz – 2.2MHz
  • FPWM, PFM, or external frequency synchronization available
  • Designed for scalable power supplies
    • Pin compatible with LMR60406-Q1, LMR60410-Q1, LMR60420-Q1, and LMR60430-Q1
  • Power-Good output for power sequencing

The LMR60440-Q1 is a 3V to 36V (42V transient), 4A synchronous buck converter designed for automotive applications. The LMR60440-Q1 offers variants with spread spectrum in an ultra-compact, 2.5mm × 2mm, HotRod QFN-9 package with wettable flanks available, which reduces inductance and achieves low electromagnetic interference (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 by including a resistor divider between the output voltage node, feedback, and ground. Each variant of the device 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 40ns minimum on-time allows high conversion ratios at high frequencies, easy loop compensation, fast transient response, and excellent load and line regulation. An open drain power-good output facilitates power sequencing requirements. The MODE/SYNC pin of the LMR60440-Q1 allows the user to select between modes of operation. Forced pulse width modulation (FPWM) mode results in constant switching frequency across load while auto mode allows for seamless transitions between pulse width modulation (PWM) and pulse frequency modulation (PFM) switching. In auto mode, the LMR60440-Q1 consumes only 5µA of quiescent current, which makes sure of high efficiency at all loads. Few external components are needed allowing for compact PCB layout. 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 synchronous buck converter designed for automotive applications. The LMR60440-Q1 offers variants with spread spectrum in an ultra-compact, 2.5mm × 2mm, HotRod QFN-9 package with wettable flanks available, which reduces inductance and achieves low electromagnetic interference (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 by including a resistor divider between the output voltage node, feedback, and ground. Each variant of the device 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 40ns minimum on-time allows high conversion ratios at high frequencies, easy loop compensation, fast transient response, and excellent load and line regulation. An open drain power-good output facilitates power sequencing requirements. The MODE/SYNC pin of the LMR60440-Q1 allows the user to select between modes of operation. Forced pulse width modulation (FPWM) mode results in constant switching frequency across load while auto mode allows for seamless transitions between pulse width modulation (PWM) and pulse frequency modulation (PFM) switching. In auto mode, the LMR60440-Q1 consumes only 5µA of quiescent current, which makes sure of high efficiency at all loads. Few external components are needed allowing for compact PCB layout. 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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Technische Dokumentation

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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 PDF | HTML 11 Dez 2024
Functional safety information LMR604x0, LMR604x0-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 12 Dez 2024
EVM User's guide LMR60440-Q1 Evaluation Module PDF | HTML 17 Okt 2024

Design und Entwicklung

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Evaluierungsplatine

LMR60440QEVM — LMR60440-Q1 Evaluierungsmodul

Das LMR60440-Q1 ist ein DC/DC-Abwärtswandler mit 36 V, 4 A, der mit synchroner Gleichrichtung eine hohe Wandlungseffizienz bei geringem Platzbedarf erreicht. Das EVM arbeitet über einen großen Eingangsspannungsbereich von 8 V bis 36 V und bietet einen geregelten 3,3 V-Ausgang mit bis zu 4 A Last (...)
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