LM63460AFSQRYFRQ1

The LM634x0-Q1 is part of a family of automotive synchronous buck DC/DC converters featuring excellent efficiency and ultra-low quiescent current. It integrates high-side and low-side MOSFETs, delivering up to 6A output current over a wide 3V to 36V input voltage range with support for load dump transients up to 42V. The converter implements soft recovery from undervoltage conditions to eliminate output overshoot. The LM634x0-Q1 employs ZEN 1 switching technology with a comprehensive set of features for superior EMI performance, including spread-spectrum frequency modulation, a low-EMI enhanced HotRod QFN package that mitigates switching node ringing, and a symmetrical pin arrangement for optimized input capacitor placement. Switching frequency is adjustable from 200kHz to 2.2MHz to avoid sensitive frequency bands while optimizing efficiency or solution size for the application. PFM mode enables frequency foldback during light-load operation, achieving a no-load current consumption of only 7µA (typical) with high light-load efficiency. Seamless switching between PWM and PFM modes, combined with low MOSFET on-resistance and an external bias input, delivers outstanding efficiency and thermal performance across the full load range. The package incorporates multiple NC pins between critical power pins to improve FMEA results.

Applications

• Automotive infotainment and instrument clusters: head units, media centers, USB charging, displays
• Automotive ADAS and body electronics

Key features

• AEC-Q100 qualified for automotive applications, device temperature grade 1: ambient operating temperature -40°C to +125°C
• Functional Safety-capable with documentation to support functional safety system design
• Versatile synchronous step-down DC/DC converter, wide input voltage range 3V to 36V, withstands load dump transients up to 42V
• Available in 4A and 6A options
• Output voltage precisely adjustable from 1V to 95% VIN with 1% accuracy
• Maximum junction temperature 150°C
• Frequency adjustable from 200kHz to 2.2MHz via RT pin or SYNC signal
• Optimized pin layout and spacing for improved short-to-adjacent-pin test reliability
• Zen 1 switch: enhanced HotRod QFN package reduces switching node ringing
• Parallel input paths minimize parasitic inductance
• Spread spectrum frequency modulation
• Selectable FPWM or PFM mode at light load
• High efficiency across full load range: 92.5% efficiency at 13.5VIN, 5VOUT, 6A, 2.1MHz
• Typical no-load quiescent input current of 7µA at 3.3VOUT
• Typical shutdown quiescent current of 0.6µA
• Typical dropout voltage of 0.6V at full load
• External bias option for improved efficiency
• Custom regulator designs can be created using WEBENCH Power Designer with LM634x0-Q1