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Texas Instruments LM634x0-Q1 Synchronous Buck DC-DC Converters

Texas Instruments LM634x0-Q1 Synchronous Buck DC-DC Converters have excellent efficiency and ultra-low IQ. With integrated high-side and low-side MOSFETs, up to 6A of output current is delivered over a wide input voltage range from 3V to 36V, with support for load-dump transients up to 42V. The converter implements soft recovery from dropout to eliminate overshooting of the output. The Texas Instruments LM634x0-Q1 incorporates numerous features for excellent EMI performance, including spread-spectrum frequency modulation, a low-EMI Enhanced HotRod QFN package that mitigates switch-node ringing, and a symmetrical pinout for excellent input capacitor placement. The switching frequency can be set between 200kHz and 2.2MHz to avoid sensitive frequency bands while optimizing efficiency or design size based on the application requirements.

PFM mode enables frequency foldback during light-load operation, allowing an unloaded current consumption of only 7µA (typical) and high light-load efficiency. A seamless transition between PWM and PFM modes, low MOSFET on-resistances, and an external bias input provide exceptional efficiency and thermal performance across the entire load range. The package has several NC pins between critical power pins, improving the Failure Modes and Effects Analysis (FMEA) result.

Features

  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1 (-40°C to +125°C ambient operating temperature)
  • Functional safety-capable
    • Documentation available to aid functional safety system design
  • Versatile synchronous buck DC/DC converter
    • Wide input voltage range of 3V to 36V with tolerance for load-dump transients up to 42V
    • 4A and 6A options available
    • 1% accurate adjustable output voltage from 1V to 95% VIN
    • 150°C maximum junction temperature
    • Frequency adjustable from 200kHz to 2.2MHz using the RT pin or a SYNC signal
  • Improved reliability with optimized pinout design and clearance for short-circuit-to-adjacent-pin test
  • Designed for low EMI requirements
    • Enhanced HotRod™ QFN package with dual input paths reduces switch-node ringing
    • Spread spectrum frequency modulation
    • Selectable FPWM or PFM mode at light loads
  • High efficiency across the full load range
    • 92.5% at 13.5VIN, 5VOUT, 6A, 2.1MHz
    • 7µA typical at 3.3VOUT no-load input current
    • 0.6µA typical shutdown quiescent current
    • 0.6V typical dropout at full load
    • External bias option for improved efficiency

Applications

  • Automotive infotainment and cluster (head unit, media hub, USB charge, display)
  • Automotive ADAS and body electronics

Functional Block Diagram

Block Diagram - Texas Instruments LM634x0-Q1 Synchronous Buck DC-DC Converters

Additional Resources

Opublikowano: 2024-09-24 | Zaktualizowano: 2025-05-15