LMQ66410R5RXBR

The LMQ664x0 is the smallest 36-V, 3-A (available in 2-A and 1-A variants) synchronous stepdown DC/DC converter with an integrated bypass and bootstrap capacitor in an enhanced HotRod™ QFN package. This easy-to-use converter supports a wide input voltage range of 2.7 V to 36 V (after start-up or after operating) with transients up to 42 V. The LMQ664x0 is specifically designed to meet low standby power requirements for always-on, industrial applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded typical current consumption of 1.5 μA at 13.5 VIN and high light load efficiency. A seamless transition between PWM and PFM modes along with very low MOSFET ON resistances makes sure there is exceptional efficiency across the entire load range. The control architecture (peak current mode) and feature set are optimized for an ultra-small solution size with minimal output capacitance. The device minimizes input filter size by using dual-random spread spectrum (DRSS), a low-EMI enhanced HotRod™ QFN package, and an optimized pin-out. The RT pin can be used to set the frequency to avoid noise sensitive frequency bands. There are NC pins between critical high voltage pins, reducing potential failures (optimal pin FMEA). The rich feature set of the LMQ664x0 is designed to simplify implementation for a wide range of industrial end equipment.

Applications

• Factory automation: PLC, DCS, and PAC
• Test and measurement
• Medical

Key features

• Functional Safety-Capable Documentation available to aid functional safety system design
• Designed for industrial applications
• Junction temperature range -40°C to +150°C
• NC pin between critical pins for better reliability
• Best in-class pin FMEA
• Input transient protection up to 42 V
• Wide input voltage range after start-up: 2.7 V (falling threshold) to 36 V
• Adjustable output up to 95% of VIN, 3.3-V, and 5-V fixed VOUT options available
• Optimized for low EMI requirements
• Integrated bypass and boot capacitors reduce EMI
• Dual Random Spread Spectrum reduces peak emissions
• Enhanced HotRod™ QFN package minimizes switch node ringing
• Adjustable FSW: 200 kHz – 2.2 MHz with RT pin
• Greater than 85% efficiency at 1 mA
• Integrated input bypass capacitors and bootstrap capacitor reducing EMI
• 2.6-mm × 2.6-mm enhanced HotRod™ QFN package with wettable flanks
• Internal control loop compensation