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LM68680-Q1

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Automotive 65V, 8A low-EMI synchronous converter optimized for safety-relevant applications

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Data sheet

LM68680-Q1

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Data sheet Order now

Product details

Rating Automotive Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Compliant Topology Buck Type Converter Iout (max) (A) 8 Vin (min) (V) 3 Vin (max) (V) 65 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 2200 Features Adjustable soft start, Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Low Noise, Overcurrent protection, Power good, Stackable, Thermal shutdown, Undervoltage Lock Out (UVLO) EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode Current Vout (min) (V) 0.8 Iq (typ) (µA) 2.1 Duty cycle (max) (%) 98
Rating Automotive Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Compliant Topology Buck Type Converter Iout (max) (A) 8 Vin (min) (V) 3 Vin (max) (V) 65 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 2200 Features Adjustable soft start, Adjustable switching frequency, Auto Mode, Automotive load dump, Enable, Fixed Output, Forced PWM, Frequency synchronization, Low Noise, Overcurrent protection, Power good, Stackable, Thermal shutdown, Undervoltage Lock Out (UVLO) EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode Current Vout (min) (V) 0.8 Iq (typ) (µA) 2.1 Duty cycle (max) (%) 98
WQFN-FCRLF (RZY) 26 20.25 mm² 4.5 x 4.5
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Compliant
    • Developed for functional safety applications
    • Documentation available to aid ISO 26262 system design planned
    • Systematic capability up to ASIL D
    • Hardware capability up to ASIL C
    • Analog built-in-self-test at start-up
    • Redundant and fast (0.35µs) VOUT monitor
    • Excellent pin FMEA and pin spacing
  • Wide input voltage range: 3V to 70V
  • 1% accurate, VOUT from 0.8V to 60V
  • Optimized for low EMI requirements
    • Facilitates CISPR 25 Class 5 compliance
    • Pin-configurable dual-random spread spectrum and slew-rate control reduce peak emissions
    • Enhanced HotRod™ QFN package with symmetrical pinout
    • Switching frequency from 300kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
  • Low minimum on time: 36ns (typical)
    • Enables 36V to 3.3V conversion at 2.1MHz
  • High-efficiency power conversion
    • > 95% peak efficiency, 12VIN to 5VOUT, 400kHz
    • No-load input current: 3.5µA
  • High power density
    • Internal compensation, OCP, and TSD
    • 4.5mm × 4.5mm eQFN-26 with wettable flanks
    • ΘJA = 18°C/W (EVM)
  • VIN to PGND pin clearance: 1.1mm
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Compliant
    • Developed for functional safety applications
    • Documentation available to aid ISO 26262 system design planned
    • Systematic capability up to ASIL D
    • Hardware capability up to ASIL C
    • Analog built-in-self-test at start-up
    • Redundant and fast (0.35µs) VOUT monitor
    • Excellent pin FMEA and pin spacing
  • Wide input voltage range: 3V to 70V
  • 1% accurate, VOUT from 0.8V to 60V
  • Optimized for low EMI requirements
    • Facilitates CISPR 25 Class 5 compliance
    • Pin-configurable dual-random spread spectrum and slew-rate control reduce peak emissions
    • Enhanced HotRod™ QFN package with symmetrical pinout
    • Switching frequency from 300kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
  • Low minimum on time: 36ns (typical)
    • Enables 36V to 3.3V conversion at 2.1MHz
  • High-efficiency power conversion
    • > 95% peak efficiency, 12VIN to 5VOUT, 400kHz
    • No-load input current: 3.5µA
  • High power density
    • Internal compensation, OCP, and TSD
    • 4.5mm × 4.5mm eQFN-26 with wettable flanks
    • ΘJA = 18°C/W (EVM)
  • VIN to PGND pin clearance: 1.1mm

The LM686x0-Q1 are a family of stackable, automotive buck converters designed for high efficiency, high power density, and ultra-low electromagnetic interference (EMI). The converters operate over a wide input voltage range of 3V to 70V simplifying input surge protection design.

The low EMI operation is enabled with minimized loop inductance, internal bypass capacitors, pin-selectable SW node slew-rate control and dual-random spread spectrum (DRSS).

The current-mode control architecture with 36ns minimum on-time allows high conversion ratios at high frequencies, easy loop compensation, fast transient response, and excellent load and line regulation. Up to two converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for supporting output current up to 16A.

The LM686x0-Q1 buck converters are specifically intended for functional safety relevant applications. An array of safety features including ABIST at start-up, redundant and fast VOUT monitor, feedback path failure detection, redundant temperature sensor, thermal shutdown, and current limit significantly reduces residual failure-in-time (FIT).

The LM686x0-Q1 are a family of stackable, automotive buck converters designed for high efficiency, high power density, and ultra-low electromagnetic interference (EMI). The converters operate over a wide input voltage range of 3V to 70V simplifying input surge protection design.

The low EMI operation is enabled with minimized loop inductance, internal bypass capacitors, pin-selectable SW node slew-rate control and dual-random spread spectrum (DRSS).

The current-mode control architecture with 36ns minimum on-time allows high conversion ratios at high frequencies, easy loop compensation, fast transient response, and excellent load and line regulation. Up to two converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for supporting output current up to 16A.

The LM686x0-Q1 buck converters are specifically intended for functional safety relevant applications. An array of safety features including ABIST at start-up, redundant and fast VOUT monitor, feedback path failure detection, redundant temperature sensor, thermal shutdown, and current limit significantly reduces residual failure-in-time (FIT).
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* Data sheet LM686x0-Q1 70V, 8A/6A/4A, Automotive Buck Converters Optimized for Safety-Relevant Applications datasheet PDF | HTML 24 Oct 2024

Design & development

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Evaluation board

LM65680-Q1EVM — LM65680-Q1 evaluation module

The LM65680-Q1 evaluation module (EVM) is a synchronous buck DC/DC regulator that employs synchronous rectification to achieve high conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 6V to 70V, which offers outsized voltage rating and operating margin (...)
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LM68680-Q1-FS — Functional safety documentation and full datasheet for LM68680-Q1

Functional safety documentation and full datasheet for LM68680-Q1
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AC/DC & DC/DC converters (integrated FET)
LM68680-Q1 — Automotive 65V, 8A low-EMI synchronous converter optimized for safety-relevant applications
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