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LMR38025-Q1

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Automotive grade 80V input 2.5A synchronous step-down (buck) DC/DC converter with spread spectrum

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Data sheet

LMR38025-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 2.5 Vin (min) (V) 4.2 Vin (max) (V) 80 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO Fixed EMI features Spread Spectrum Control mode current mode Vout (min) (V) 1 Vout (max) (V) 75 Iq (typ) (µA) 40 Duty cycle (max) (%) 98
Rating Automotive Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 2.5 Vin (min) (V) 4.2 Vin (max) (V) 80 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO Fixed EMI features Spread Spectrum Control mode current mode Vout (min) (V) 1 Vout (max) (V) 75 Iq (typ) (µA) 40 Duty cycle (max) (%) 98
WSON (DRR) 12 9 mm² 3 x 3
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
  • Designed for Low EMI requirements
    • Spread spectrum option for reduced peak emissions
    • Low package parasitics facilitating CIPR25 class 5 compliance
  • Configured for rugged automotive applications
    • 4.2V to 80V input voltage range
    • 2.5A continuous output current
    • Ultra-low 40µA operating quiescent current
    • 200kHz to 2.2MHz adjustable switching frequency
    • Frequency synchronization to external clock
    • 97% maximum duty cycle
    • Supports start-up events with prebiased output
    • ±1.5% reference voltage tolerance over temperature
    • Precision enable
    • Easy to use with integrated compensation network enabling low BOM count
    • Integrated synchronous rectification
    • 12-pin WSON wettable flank with PowerPAD™ integrated circuit package
    • PFM and forced PWM (FPWM) options
  • Create a custom design using the LMR38025-Q1 with the WEBENCH Power Designer
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
  • Designed for Low EMI requirements
    • Spread spectrum option for reduced peak emissions
    • Low package parasitics facilitating CIPR25 class 5 compliance
  • Configured for rugged automotive applications
    • 4.2V to 80V input voltage range
    • 2.5A continuous output current
    • Ultra-low 40µA operating quiescent current
    • 200kHz to 2.2MHz adjustable switching frequency
    • Frequency synchronization to external clock
    • 97% maximum duty cycle
    • Supports start-up events with prebiased output
    • ±1.5% reference voltage tolerance over temperature
    • Precision enable
    • Easy to use with integrated compensation network enabling low BOM count
    • Integrated synchronous rectification
    • 12-pin WSON wettable flank with PowerPAD™ integrated circuit package
    • PFM and forced PWM (FPWM) options
  • Create a custom design using the LMR38025-Q1 with the WEBENCH Power Designer

The LMR38025-Q1 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. The LMR38025-Q1 operates during input voltage dips as low as 4.2V, at nearly 100% duty cycle if needed, making the device an excellent choice for 48V battery automotive applications and MHEV/EV systems as the absolute maximum input voltage is 85V.

The LMR38025-Q1 features a high voltage enable pin to enable the device by connecting the device to the wide input supply voltage or by having precise UVLO control across start-up and shutdown. The power-good flag, with built-in filtering and delay, offers a true indication of system status, eliminating the need for an external supervisor. The device incorporates pseudorandom spread spectrum option for minimal EMI. The switching frequency can be configured between 200kHz and 2.2MHz to avoid noise sensitive frequency bands. In addition, the frequency can be programmed through the RT pin for improved efficiency at low operating frequencies or by having a smaller design size at high operating frequencies.

The device has built-in protection features such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. The LMR38025-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in a 12-pin WSON package.

The LMR38025-Q1 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. The LMR38025-Q1 operates during input voltage dips as low as 4.2V, at nearly 100% duty cycle if needed, making the device an excellent choice for 48V battery automotive applications and MHEV/EV systems as the absolute maximum input voltage is 85V.

The LMR38025-Q1 features a high voltage enable pin to enable the device by connecting the device to the wide input supply voltage or by having precise UVLO control across start-up and shutdown. The power-good flag, with built-in filtering and delay, offers a true indication of system status, eliminating the need for an external supervisor. The device incorporates pseudorandom spread spectrum option for minimal EMI. The switching frequency can be configured between 200kHz and 2.2MHz to avoid noise sensitive frequency bands. In addition, the frequency can be programmed through the RT pin for improved efficiency at low operating frequencies or by having a smaller design size at high operating frequencies.

The device has built-in protection features such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. The LMR38025-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in a 12-pin WSON package.
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Technical documentation

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Type Title Date
* Data sheet LMR38025-Q1 SIMPLE SWITCHER Power Converter, 4.2V to 80V, 2.5A , Automotive Synchronous Buck Converter With 40µA IQ datasheet (Rev. A) PDF | HTML 29 Feb 2024
Application note Reducing Conducted EMI in a Buck Converter for 48 V Automotive Applications PDF | HTML 13 Dec 2023
Functional safety information LMR380x5-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 06 Nov 2023
EVM User's guide LMR38025QEVM User's Guide PDF | HTML 03 Nov 2023

Design & development

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Evaluation board

LMR38025QEVM — LMR38025-Q1 evaluation module for 4.2-V to 80-V, synchronous buck SIMPLE SWITCHER® power converter

User guide: PDF | HTML
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Simulation model

LMR38025F-Q1 PSpice Transient Model

SNVMCC6.ZIP (373 KB) - PSpice Model
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WSON (DRR) 12 Ultra Librarian
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