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Texas Instruments LM68425-Q1 Buck DC/DC Converter

Texas Instruments LM68425-Q1 Buck DC/DC Converter is an automotive device designed for high efficiency, high power density, and ultra-low Electromagnetic Interference (EMI). This DC/DC converter operates over a wide input voltage range of 3V to 42V. The LM68425-Q1 buck converter is available with pin-selectable fixed output voltages of 3.3V and 5V, or in an adjustable configuration. This buck converter is specifically intended for functional safety-relevant applications. The LM68425-Q1 device is AEC-Q100 qualified for automotive applications. This buck converter comes in a 3.6mm x 2.6mm, thermally enhanced 20-pin eQFN package. The LM68425-Q1 converter is ideal for Advanced Driver Assistance Systems (ADAS), automotive infotainment and cluster, hybrid, electric, and powertrain systems.

Features

  • AEC-Q100 qualified for automotive applications:
    • -40°C to 125°C, TA temperature grade 1
  • Functional safety compliant:
    • Documentation available to aid ISO 26262 system designs 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
    • Feedback path failure detection
    • Redundant temperature sensor
    • Excellent pin FMEA and pin spacing
  • 3V to 42V wide input voltage range
  • ZEN 1 switcher technology:
    • Facilitates CISPR 25 class 5 compliance
    • ±5% dual-random spread spectrum
    • Enhanced HotRod™ QFN package
    • 300kHz to 2.2MHz switching frequency range
    • Pin-configurable AUTO or FPWM operation
    • Internal compensation, current limit, and Thermal Shutdown (TSD)
  • 40ns (maximum) with low minimum on time:
    • Enables 36VIN to 3.3VOUT at 2.2MHz
  • High-efficiency power conversion at all loads:
    • >94% peak efficiency at 24VIN, 5VOUT, 400kHz
    • 2.5µA switching input current at no load
  • High power density:
    • Compact 3.6mm x 2.6mm, 20-pin eQFN package with wettable flank
    • Pin compatible with 36V 4/6/8A LM654x0-Q1
    • Pin compatible with 65V 2.5/3.5/4.5A LM656x5Q1
    • ϴJA = 24.0°C/W (LM65645-Q1EVM)
  • Create a custom design using the LM684x5-Q1 with the WEBENCH® Power Designer

Applications

  • Advanced Driver Assistance Systems (ADAS)
  • Automotive infotainment and cluster
  • Hybrid, electric, and powertrain systems

Block Diagram

Block Diagram - Texas Instruments LM68425-Q1 Buck DC/DC Converter

Schematic

Schematic - Texas Instruments LM68425-Q1 Buck DC/DC Converter
Published: 2026-01-06 | Updated: 2026-01-13